CN112510573B

CN112510573B - Outgoing cable overhauling method based on temporary mobile power supply application

Info

Publication number: CN112510573B
Application number: CN202011051507.1A
Authority: CN
Inventors: 陈胜科; 刘欣宇; 焦建立; 赵斌炎; 张瑞; 谭程凯; 韩一鸣; 胡岩锋
Original assignee: Live Working Branch Of Zhejiang Dayou Industrial Co ltd
Current assignee: Live Working Branch Of Zhejiang Dayou Industrial Co ltd
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2022-05-31
Anticipated expiration: 2040-09-29
Also published as: CN112510573A

Abstract

The application provides an outgoing cable overhauling method based on temporary mobile power supply application, which comprises the steps of selecting a tower to carry out charged load strain opening operation, and connecting a temporary mobile power supply primary grid-connected cable to a load side of a demarcation point switch in a charged mode; and overlapping the primary grid-connected cable of the temporary mobile power supply on the load side of the demarcation point switch in a live working mode to start primary grid connection, overlapping the secondary grid-connected cable of the temporary mobile power supply on the commercial power side of the demarcation point switch in a live working mode to start secondary grid connection, and judging whether to perform automatic switch-on operation on the secondary grid-connected switch in the temporary mobile power supply based on the phase sequence checking result of the temporary mobile power supply and the system power supply. Through the mode of primary grid connection or secondary grid connection, the position of the upper rod of the cable is isolated by using the demarcation point switch, the condition that the outgoing cable is in power failure, shifted and changed to be connected is ensured, meanwhile, a user on the overhead line still keeps normal power utilization, and the loss of the number of users caused by power failure, maintenance, shifted and changed outgoing cable is avoided or greatly reduced.

Description

Outgoing cable overhauling method based on temporary mobile power supply application

Technical Field

The invention relates to the field of power distribution network maintenance methods, in particular to an outgoing cable maintenance method based on temporary mobile power supply application.

Background

In the urbanization process of the urbanization, because of municipal construction needs, often can excavate the maintenance to some road sections that lay or bury the overhead line cable. At this time, the outgoing cables in the live operation state need to be shifted and re-routed.

For a circuit of a ring network or a contact connection, an outgoing cable of the circuit can supply power by an opposite side power supply II in a power supply switching mode so as to ensure that the power consumption of a user on the circuit is not influenced, and power failure displacement replacement is performed, as shown in fig. 1.

When the excavation and repair area occurs in an outgoing cable embedding section between a power supply I and an overhead line, due to the existence of an opposite side power supply II, the operation mode of the overhead line can be changed from the original power transmission output of the power supply I to the power transmission output of the opposite side power supply II through the hot back-switching operation of an outgoing switch and the like, so that when the outgoing cable at the position of the power supply I is changed in a power failure displacement mode, normal power utilization of a user 1, a user 2, a user 3, a user 4 and a user 5 on the overhead line is not influenced.

However, for the radial structure line without the opposite side power supply II, as shown in fig. 2, when the outgoing cable burying section of the power supply needs to be excavated and repaired due to municipal engineering construction, and the like, the excavation and repair occurs at the power supply head position of the overhead line, all the rear section of the radial structure overhead line will be powered off, so that the

users

1, 2, 3, 4 and 5 stop, and the power supply to the

users

1, 2, 3, 4 and 5 cannot be restored until the outgoing cable position is excavated and repaired or the outgoing cable is shifted, replaced and reconnected.

Usually, the excavation and trimming work of the municipal engineering construction or the replacement, the connection, the replacement and the switching of the outgoing cable usually last for several hours, so that great loss of the number of users during power failure can be generated for power supply enterprises, and the power supply reliability and the power operator environment of the power supply enterprises and the power utilization satisfaction degree of the users are seriously influenced.

Disclosure of Invention

In order to solve the defects and shortcomings in the prior art, the outgoing cable maintenance method based on the application of the temporary mobile power supply is provided, the position of an upper rod of a cable is isolated by using a demarcation point switch in a primary grid-connected mode or a secondary grid-connected mode of the temporary mobile power supply, and a user on an overhead line keeps normal power utilization while the outgoing cable is ensured to be subjected to power failure, displacement, replacement and reconnection.

Specifically, the outgoing cable overhauling method based on the application of the temporary mobile power supply provided by the embodiment of the application comprises the following steps:

step 1, selecting a tower behind a radiation overhead line outgoing switch to carry out charged on-load strain opening operation, and additionally installing a demarcation point switch;

step 2, starting the temporary mobile power supply and placing the temporary mobile power supply in an idle running state, switching a primary grid-connected switch in the temporary mobile power supply to a disconnected state, and carrying out live-line lapping on a primary grid-connected cable of the temporary mobile power supply to a load side of a demarcation point switch in a live-line operation mode to prepare for primary grid connection;

step 3, overlapping a primary grid-connected cable of the temporary mobile power supply on a load side of the demarcation point switch in a live working mode, starting primary grid connection, and judging whether to perform automatic switch-on operation on the primary grid-connected switch in the temporary mobile power supply or not based on a phase sequence checking result of the temporary mobile power supply and a system power supply;

step 4, pulling open a demarcation point switch, changing the current power supply user to a temporary mobile power supply for supplying power, disconnecting an outgoing cable interval switch and an outgoing cable switch below a bus in the system power supply, and shifting, replacing and changing the outgoing cable in a power failure mode;

step 5, shifting the outgoing cable on the day of power failure maintenance, and closing an outgoing cable interval switch and an outgoing switch of the overhead line below a bus in the system power supply after shifting is finished;

and 6, overlapping a temporary mobile power supply secondary grid-connected cable on the commercial power side of the demarcation point switch in a live working mode, starting secondary grid connection, and judging whether to perform automatic switch-on operation on a secondary grid-connected switch in the temporary mobile power supply or not based on the phase sequence checking result of the temporary mobile power supply and the system power supply.

And 7, after the secondary grid connection is finished, after the phases are checked on two sides of the demarcation point switch, closing the demarcation point switch, sequentially withdrawing the primary grid connection cable and the secondary grid connection cable, and finally removing the temporary mobile power supply.

Optionally, the outgoing cable repair method is suitable for the situation that the outgoing cable is repaired by the radiation structure overhead line of the outgoing switch at the head end and the situation that the outgoing cable is repaired by the radiation structure overhead line of the outgoing switch not at the head end;

each case comprises two processing methods of completely uninterrupted power supply and short-time power failure.

Optionally, when the outgoing cable is repaired by using the completely uninterrupted power supply processing method for the outgoing switch in the case of the radiation structure overhead line at the head end, the

steps

6 and 7 include:

after the original outgoing cable is subjected to power failure maintenance and displacement, the secondary grid-connected switch in the temporary mobile power supply is in a disconnected state, the secondary grid-connected cable lap joint of the temporary mobile power supply is realized on the commercial power supply side of the demarcation point switch through live working, and the lap joint phase sequence of the secondary grid-connected cable of the temporary mobile power supply on the line is strictly consistent with the lap joint phase sequence of the primary grid-connected cable of the temporary mobile power supply on the line through flexible cable phase identification.

Optionally, when the processing method of completely uninterrupted power supply is adopted, the outgoing cable overhauling method further includes:

and then starting second grid connection: if the phase sequence is consistent, when the temporary mobile power supply is synchronous with the system power supply, the secondary grid-connected switch is automatically switched on; if the phase sequences are inconsistent, pulling open an outgoing cable interval switch and an outgoing switch below a bus in the system power supply, correcting the phase of the outgoing cable in a power failure mode, then carrying out secondary grid connection, and after the secondary grid connection is successful, simultaneously supplying power to users on the overhead line by the temporary mobile power supply and the system power supply;

after the second grid connection is successful, the dispatching permits the operating personnel to check the phases at the two sides of the demarcation point switch, and if the phases are inconsistent, the operating personnel reports that the phases at the two sides of the demarcation point switch are not correct; the dispatching permits field operating personnel to disconnect the secondary grid-connected switch and correct the lapping phase of the secondary grid-connected cable; pulling open an outgoing cable interval switch and an outgoing switch below a bus in a system power supply, correcting the phase of the outgoing cable in a power failure mode, and then carrying out secondary grid connection and phase checking on two sides of a demarcation point switch; after the phases of the two sides of the demarcation point switch are checked to be correct, scheduling and permitting field operating personnel to close the demarcation point switch for grid connection;

after the dividing point switch is successfully connected to the grid, sequentially pulling a first grid-connected switch and a second grid-connected switch in the temporary mobile power supply; and (3) removing the primary grid-connected and secondary grid-connected cables of the temporary mobile power supply in a live-line operation mode, and stopping the temporary mobile power supply and quitting power supply.

Optionally, when the method for processing short-time power failure is adopted for the outgoing switch under the condition that the outgoing cable of the radiation structure overhead line at the head end is overhauled, the method further includes the following steps:

after the outgoing cable is shifted, replaced and reconnected in a power failure mode in the step 5, the outgoing cable interval switch below the bus in the system power supply and the outgoing switch of the overhead line are closed, and then the commercial power access and the temporary mobile power supply can be quitted in a cold pouring mode: if the phases of the cores on the two sides of the demarcation point switch are incorrect, an outgoing line cable interval switch and an outgoing line switch below a bus in a system power supply are pulled open, and the outgoing line cable is corrected in a power failure mode; after the phase is correct, a primary grid-connected switch in the temporary mobile power supply is pulled open, a user has power failure for a short time, a demarcation point switch is closed, the user recovers power supply, the temporary mobile power supply is stopped, a primary grid-connected cable of the temporary mobile power supply is removed in a live-line operation mode, and the temporary mobile power supply is stopped and exits from operation.

Optionally, when the method for processing short-time power failure is adopted under the condition that the outgoing cable is repaired by the outgoing switch on the radiation structure overhead line at the head end, the step of not using the demarcation point switch can be further adopted:

before construction, firstly, selecting a tower suitable for accessing a temporary mobile power supply on a radiation overhead line, starting the temporary mobile power supply, carrying out no-load operation, enabling a primary grid-connected switch in the temporary mobile power supply to be in a disconnected state, and carrying out live-line work to connect a primary grid-connected cable of the temporary mobile power supply to the tower suitable for accessing the temporary mobile power supply on the radiation overhead line in a live-line mode to prepare for primary grid connection.

And judging whether to automatically switch on a primary grid-connected switch in the temporary mobile power supply or not based on the phase sequence checking result of the temporary mobile power supply and the system power supply.

And pulling the original outlet switch of the overhead line open, and supplying power to the user by the temporary mobile power supply. Disconnecting the outgoing cable interval switch below the bus in the system power supply, and shifting, replacing and reconnecting the outgoing cable in a power failure mode. The replacement of shifting is changed and is connect to finish, adopts the cold mode of falling to carry out commercial power and inserts and temporary portable power source's work of withdrawing from: closing an outgoing cable interval switch below a bus in the system power supply, checking positions on two sides of the outgoing cable interval switch, if the phase is incorrect, pulling open the outgoing cable interval switch below the bus in the system power supply, and correcting the phase of the outgoing cable in a power failure mode; after the phase is correct, a primary grid-connected switch in the temporary mobile power supply is pulled open, a user has power failure for a short time, an original outlet switch is closed, the user recovers power supply, the temporary mobile power supply is stopped, a primary grid-connected cable of the temporary mobile power supply is detached in a live-line operation mode, and the temporary mobile power supply is stopped and exits operation.

Optionally, when the completely uninterruptible power supply processing method is adopted under the condition that the outgoing cable is repaired for the radiation structure overhead line of which the outgoing switch is not at the head end, the steps include:

selecting a base tower from the front end and the rear end of a radiation overhead line outgoing switch rod, carrying out charged on the base tower by adopting a live working mode to open strain, and respectively installing two demarcation point switches.

Starting the two temporary mobile power supplies, running in an idle state, enabling a primary grid-connected switch in the two temporary mobile power supplies to be in a disconnected state, and respectively connecting primary grid-connected cables of the two temporary mobile power supplies to a load side of a demarcation point switch in an electrified mode to prepare for primary grid connection.

And respectively overlapping two temporary mobile power supply primary grid-connected cables on the load sides of the two demarcation point switches in a live working mode, starting primary grid connection, and judging whether to perform automatic switch-on operation on the primary grid-connected switch in the temporary mobile power supply or not based on the phase sequence checking result of the temporary mobile power supply and the system power supply.

After the two temporary mobile power supplies are successfully connected to the grid at one time, the two demarcation point switches are respectively pulled open, and the two temporary mobile power supplies are used for supplying power to the user. And disconnecting the outgoing cable interval switch and the outgoing switch below the bus in the system power supply, and shifting, replacing and switching the outgoing cable in a power failure mode.

And on the day of power failure maintenance, the outgoing cable is shifted, replaced and reconnected as required by excavation and trimming, and the outgoing cable interval switch and the overhead line outgoing switch below the bus in the system power supply are closed. And after the secondary grid connection is successful, performing phase checking on two sides of a first demarcation point switch corresponding to the first temporary mobile power supply, wherein the phases are inconsistent, on-site operating personnel allowed by dispatching disconnect the secondary grid connection switch and adopt a live-line operation mode to correct the lap joint phase of the secondary grid connection cable of the first temporary mobile power supply, pull open an outgoing cable interval switch and an outgoing line switch of an overhead line below a bus in the system power supply, and adopt a power failure mode to adjust the phases. And after the first demarcation point switch is closed, the first grid-connected switch and the second grid-connected switch of the first temporary mobile power supply are sequentially pulled open. And removing the primary grid-connected cable and the secondary grid-connected cable in a live-line operation mode, and quitting the first temporary mobile power supply from running.

Secondly, carrying out secondary grid connection on a second temporary mobile power supply, after the secondary grid connection is successful, carrying out phase checking on a second boundary point switch corresponding to the second temporary mobile power supply, wherein the phases are inconsistent, allowing field operators to disconnect the second grid connection switch by scheduling and correcting the lapping phase of a secondary grid connection cable of the second temporary mobile power supply by adopting a live working mode, and adjusting the phase of an overhead line part between an outgoing line switch rod and the second boundary point switch by adopting the live working mode; after the second demarcation point switch is closed, sequentially opening a first grid-connected switch and a second grid-connected switch in the second temporary mobile power supply; and removing the primary grid-connected cable and the secondary grid-connected cable in a live-line operation mode, and quitting the second temporary mobile power supply.

Optionally, when the method for processing short-time power failure is used in a case where an outgoing cable is repaired for an overhead line of a radiation structure in which an outgoing switch is not located at a head end, the method includes:

before construction, firstly selecting a tower suitable for accessing a temporary mobile power supply on a radiation overhead line, starting the temporary mobile power supply, running in an idle state, enabling a primary grid-connected switch in the temporary mobile power supply to be in a disconnected state, and carrying out live-wire lapping on a primary grid-connected cable of the temporary mobile power supply on the tower suitable for accessing the temporary mobile power supply on the radiation overhead line in a live-wire operation mode to prepare for primary grid connection.

And pulling the original outlet switch of the overhead line open, and supplying power to the user by the temporary mobile power supply. And disconnecting the outgoing cable interval switch below the bus in the system power supply, and shifting, replacing and switching the outgoing cable in a power failure mode. The replacement of shifting is changed and is connect to finish, adopts the cold mode of falling to carry out commercial power and inserts and temporary portable power source's work of withdrawing from: closing an outgoing cable interval switch below a bus in the system power supply, checking positions on two sides of the outgoing cable interval switch, if the phase is incorrect, pulling open the outgoing cable interval switch below the bus in the system power supply, and correcting the phase of the outgoing cable in a power failure mode; after the phase is correct, a primary grid-connected switch in the temporary mobile power supply is pulled open, a user has power failure for a short time, an original outlet switch is closed, the user recovers power supply, the temporary mobile power supply is stopped, a primary grid-connected cable of the temporary mobile power supply is detached in a live-line operation mode, and the temporary mobile power supply is stopped and exits operation.

The beneficial effect that technical scheme that this application provided brought is:

this application adopts interim portable power source to insert on overhead line, and through once being incorporated into the power networks or the mode that the secondary was incorporated into the power networks, the cable upper boom position that will appear utilizes the demarcation point switch to keep apart, when guaranteeing that the cable that is qualified for the next round of competitions has a power failure to shift and changes and change the change and connect, the user keeps normal power consumption on the overhead line, avoids or very big reduction has a power failure to overhaul to shift and changes the number of households loss of the time that the cable that changes and connect and bring, brings huge economic benefits and social for the enterprise.

The temporary mobile power supply is connected and disconnected, and the operation of a demarcation point switch is newly arranged on the overhead line, the whole process is carried out in a charged operation mode, and the loss of the number of households in power failure is avoided. The demarcation point switch and the lead wire can adopt a bypass load switch and a flexible cable, after the demarcation point switch is verified to be faultless and successfully connected to the grid, the live-line working mode can be adopted to lap the trip lead wire with load, and then the bypass load switch is pulled to be detached without changing the normal running mode of the overhead line.

Drawings

In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic diagram of a cable of an overhead line shifted and replaced during ring network or contact wiring;

FIG. 2 is a schematic diagram of a line shift, replacement and connection-changed overhead line outgoing cable with a radial structure;

FIG. 3 is a schematic diagram of a radiant structure overhead line with an outgoing switch at the head end and a temporary mobile power supply connected to the grid at one time;

fig. 3-1 is a schematic diagram of the state of the device after the temporary mobile power supply is successfully connected to the grid once, of the radiation structure overhead line at the head end of the outgoing switch;

fig. 3-2 is a schematic diagram of a radiation structure overhead line with an outgoing line switch at the head end, after the outgoing line cable is shifted, replaced and reconnected;

3-3 are schematic diagrams of a radial structure overhead line with an outgoing switch at the head end, without using a demarcation point switch for a temporary mobile power primary grid connection;

3-4 are schematic diagrams of a radiant structure overhead line with an outgoing switch at the head end, after a temporary mobile power supply is successfully once grid-connected without using a demarcation point switch;

3-5 are schematic diagrams of a radiating structure overhead line with an outgoing switch at the head end, without using a demarcation point switch to temporarily remove the mobile power supply for exit;

FIG. 4 is a schematic diagram of a radiation structure overhead line with an outgoing switch at the head end and a temporary mobile power supply secondary grid connection;

FIG. 5 is a schematic diagram of a radiating structure overhead line with an outgoing line switch at the head end, after the temporary mobile power supply exits;

FIG. 6 is a schematic diagram of a temporary mobile power supply once grid connection, wherein an outgoing switch is not arranged at the head end of an overhead line of a radiation structure;

FIG. 6-1 is a schematic diagram of the device after the temporary mobile power supply is successfully connected to the grid once, the outgoing switch is not located at the head end of the overhead line of the radiation structure;

fig. 6-2 is a schematic diagram of the device when the outgoing switch is not at the head end of the overhead line of the radiation structure and the temporary mobile power supply is withdrawn;

FIG. 7 is a schematic diagram of a primary grid connection of an outgoing line switch which is not located at the head end of an overhead line of a radiation structure and adopts two temporary mobile power supplies;

FIG. 7-1 is a schematic diagram of the device after the outgoing switch is not at the head end of the overhead line of the radiation structure and two temporary mobile power supplies are adopted for one-time grid connection success;

fig. 7-2 is a schematic diagram of the outgoing switch not being at the head end of the overhead line of the radiation structure when the first temporary mobile power supply is secondarily connected to the grid;

7-3 are schematic diagrams of the outgoing switch not being at the head end of the radiating structure overhead line and the second temporary mobile power supply being secondarily connected to the grid;

fig. 7-4 are schematic diagrams after the outgoing switch is not at the head end of the overhead line of the radiation structure, and the temporary mobile power supply I and the temporary mobile power supply II exit.

Detailed Description

To make the structure and advantages of the present application clearer, the structure of the present application will be further described with reference to the accompanying drawings.

Example one

The application provides a method for overhauling the outgoing cable by using the temporary mobile power supply, so that the defect that the number of users is lost when a large amount of power is cut off due to the fact that a user stops accompanying the overhead line because a side power supply is not sent backwards when the outgoing cable area of the radial structure line is excavated and repaired is overcome.

According to the technical scheme, the temporary mobile power supply and the demarcation point switch are used for primary and secondary grid connection respectively, the temporary mobile power supply is connected and disconnected, short-time power failure does not exist in the recovery process of a system power supply, complete uninterrupted power supply is achieved, and complete uninterrupted maintenance of the outgoing cable of the radiation structure overhead line with the outgoing switch not at the head end can be achieved.

The technical scheme provided by the application brings the beneficial effects that:

this application adopts interim portable power source to insert on the overhead line, mode through once being incorporated into the power networks or the secondary is incorporated into the power networks, the cable upper boom position utilization demarcation point switch will appear keeps apart, when guaranteeing that the cable of being qualified for the next round of competitions has a power failure to shift and change and connect, interim portable power source's the grid-connected and the off-line, the recovery process of system's power source does not have the short-term power failure, complete uninterrupted power supply, the user keeps normal power consumption on the overhead line, avoid or very big reduction has a power failure to overhaul to shift and change the time house number loss that the change outlet wire cable brought, bring huge economic benefits and social for the enterprise.

The grid connection and disconnection processes of the temporary mobile power supply and the work of newly setting a demarcation point switch on the overhead line are carried out in the whole process by adopting a charged working mode, so that the loss of the number of households in power failure is avoided. The demarcation point switch and the lead wire can adopt a bypass load switch and a flexible cable, after the demarcation point switch is verified to be faultless and successfully connected to the grid, the live-line working mode can be adopted to lap the trip lead wire with load, and then the bypass load switch is pulled to be detached without changing the normal running mode of the overhead line.

Example two

For the condition that the outgoing cable is repaired on the radiation structure overhead line at the head end of the outgoing switch, the following technical steps are adopted:

the short-term power failure mode includes:

1. as shown in fig. 3: because the excavation and trimming area is on the outgoing cable path of the overhead line, the outgoing cable of the overhead line needs to be shifted, replaced and reconnected, and the mode of temporary mobile power supply access is adopted to ensure the continuous power supply of the

users

1, 2, 3, 4 and 5 on the line.

2. As shown in fig. 3: a base tower 2# pole is selected behind an overhead line outgoing switch, a live working mode is adopted to open a tension insulator under a live load, a demarcation point switch is additionally arranged, and the demarcation point switch is located at a closing position. The No. 1 pole and the No. 2 pole can be adjacent poles or non-adjacent poles, and no user exists between the No. 1 pole and the No. 2 pole.

3. As shown in fig. 3: starting the temporary mobile power supply, running in an idle state, enabling a primary grid-connected switch in the temporary mobile power supply to be in a disconnected state, and scheduling to permit field operation personnel to carry out live-line lapping on a primary grid-connected cable of the temporary mobile power supply in a live-line operation mode and carrying out primary grid connection (phase sequence checking).

4. As shown in fig. 3: the operator realizes the splicing of a temporary mobile power supply 1# cable through live working at a point A on a demarcation point switch load side, and then starts to be connected to the grid for the first time: if the phase sequence is consistent, a ' first grid-connected switch ' button on a control screen is pressed, a controller in the temporary mobile power supply automatically detects the output deviation of the commercial power and the temporary mobile power supply, the temporary mobile power supply output power supply is automatically adjusted, when the temporary mobile power supply is synchronous with a system power supply, a synchronous table pointer on the controller is aligned to the twelve o ' clock direction, and the first grid-connected switch is automatically switched on; if the phase sequence is inconsistent, the control panel displays that the phase sequence is inconsistent, the lap joint sequence of the temporary mobile power supply 1# cable A, C at the point A needs to be adjusted in a live working mode until the phase sequence is consistent, and then a 'first grid-connected switch' button on the control screen is pressed.

5. As shown in fig. 3-1: and pulling the 2# rod demarcation point switch open, supplying power to all overhead line loads by the temporary mobile power supply, pulling the outgoing cable interval switch and the 1# rod outgoing switch below the bus in the system power supply open, and shifting, replacing and switching the outgoing cables in a power failure mode.

6. As shown in fig. 3-2, after the outgoing cable is shifted, replaced and reconnected due to the need of excavation and trimming, the outgoing cable interval switch and the 1# rod outgoing switch below the bus in the system power supply are closed, and the demarcation point switch is in the disconnection position.

7. Nuclear phases are arranged on two sides of a 2# rod demarcation point switch, if the phases are incorrect, an outgoing cable interval switch below a bus and a 1# rod outgoing switch in a system power supply are pulled open, the outgoing cable is corrected in a power failure mode, after the phases are correct, the outgoing cable interval switch below the bus and the 1# rod outgoing switch in the power supply are closed, a primary grid-connected switch inside a temporary mobile power supply is pulled open, the 2# rod demarcation point switch is closed immediately, the user has a short-time power failure, after power supply is recovered, a 'stop' button is pressed down, the temporary mobile power supply is stopped, the primary grid-connected cable of the temporary mobile power supply is removed in a live working mode, and the temporary mobile power supply exits from operation.

8. In the embodiment, because the temporary mobile power supply adopts a primary grid-connected cold-falling mode to switch the power supply of the overhead line, when the temporary mobile power supply is disconnected from the grid, a short-time power failure of several minutes can be generated in the system power supply recovery process, taking fig. 3-2 as an example, a primary grid-connected switch of the temporary mobile power supply is pulled open, and then a 2# rod demarcation point switch is closed for 10 minutes at the longest, when the power failure occurs, the loss of the number of users is 5 × 1/6 and is about 0.83, and the number of users is at least several hours compared with the normal power failure maintenance displacement replacement cable, when the power failure occurs, the loss of the number of users is dozens of ratios, the loss of the number of users during the power failure is greatly reduced, and the power supply reliability and the power operator environment are effectively improved.

In addition to the above steps, the short-time power failure mode may further include the following steps without using a demarcation point switch:

1. as shown in fig. 3-3: because the excavation and trimming area is on the outgoing cable path of the overhead line, the outgoing cable at the head end of the overhead line needs to be shifted, replaced and reconnected, and the mode of temporary mobile power supply access is adopted to ensure the continuous power supply of

users

1, 2, 3, 4 and 5 on the line.

2. As shown in fig. 3-3: starting the temporary mobile power supply, running in an idle state, enabling a primary grid-connected switch in the temporary mobile power supply to be in a disconnected state, and scheduling to permit field operation personnel to carry out live-line lapping on a primary grid-connected cable of the temporary mobile power supply in a live-line operation mode and carrying out primary grid connection (phase sequence checking).

3. The operating personnel is suitable for the A point that the cable that is incorporated into the power networks inserts on the overhead line, realizes the cable tie-in that once incorporates into the power networks of interim portable power source through live-wire work, and later begin to incorporate into the power networks for the first time: if the phase sequence is consistent, a ' first grid-connected switch ' button on a control screen is pressed, a controller in the temporary mobile power supply automatically detects the output deviation of the commercial power and the temporary mobile power supply, the temporary mobile power supply output power supply is automatically adjusted, when the temporary mobile power supply is synchronous with a system power supply, a synchronous table pointer on the controller is aligned to the twelve o ' clock direction, and the first grid-connected switch is automatically switched on; if the phase sequence is inconsistent, the control panel displays that the phase sequence is inconsistent, the lap joint sequence of the temporary mobile power primary grid-connected cable A, C at the point A needs to be adjusted in a live working mode until the phase sequence is consistent, and then a 'primary grid-connected switch' button on the control screen is pressed. And at the moment, the power supply and the temporary mobile power supply power to the user on the overhead line at the same time.

4. As shown in fig. 3-4: after the grid connection is successful for the first time, the outgoing cable interval switch and the outgoing switch below the bus in the system power supply are pulled open, and the outgoing cable is replaced and reconnected in a power failure mode.

5. As shown in fig. 3-5, after the outgoing cable is moved, replaced and reconnected due to the need of excavation and trimming, the outgoing cable interval switch below the bus in the system power supply is closed, the phases are checked at the two sides of the outgoing cable switch, if the phases are inconsistent, the outgoing cable interval switch below the bus in the system power supply is opened, and the phase of the outgoing cable is corrected in a power failure mode. And if the cores at the two sides of the outgoing switch are consistent, disconnecting the primary grid-connected switch in the temporary mobile power supply, and closing the outgoing switch. At this time, the users 1-5 on the overhead line are supplied with power by the system power supply, the outgoing cable after the replacement and the connection by shifting and the outgoing switch.

6. The operation can cause the user to power off for a short time, after the user recovers power supply, the user presses a 'stop' button, the temporary mobile power supply stops, the temporary mobile power supply primary grid-connected cable is detached in a live-line operation mode, and the temporary mobile power supply quits operation.

In this embodiment, because the temporary mobile power supply switches the power supply of the overhead line in a primary grid-connected cold-falling mode, when the temporary mobile power supply is disconnected from the grid, a short-time power failure of several minutes can be generated in the system power supply recovery process, taking fig. 3-5 as an example, the longest time of 10 minutes is taken as an example from the disconnection of a primary grid-connected switch in the temporary mobile power supply to the reclosing of an outgoing switch, the loss of the number of users in the power failure is 5 × 1/6 about 0.83 hours per household, compared with the normal power failure, the cable replacement by the maintenance and displacement is required for at least several hours, the loss of the number of users in the power failure is dozens of times, the loss of the number of users in the power failure is greatly reduced, and the power supply reliability and the power business environment are effectively improved.

A completely uninterruptible power supply system comprising:

1. as shown in fig. 3: because the excavation and trimming area is arranged on the outgoing cable path of the overhead line, the outgoing cable of the overhead line needs to be shifted, replaced and reconnected, and the continuous power supply of the

users

1, 2, 3, 4 and 5 on the line is ensured by adopting a temporary mobile power supply access mode.

2. As shown in fig. 3: a base tower 2# pole is selected behind an overhead line outgoing switch, a live working mode is adopted to open a tension insulator under a live load, a demarcation point switch is additionally arranged, and the demarcation point switch is located at a closing position. The No. 2 pole can also be newly erected in a live working mode. The 1# pole and the 2# pole can be adjacent poles or non-adjacent poles, and no user exists between the 1# pole and the 2# pole.

3. As shown in fig. 3: the temporary mobile power supply is started and operates in an idle state, a first grid-connected switch in the temporary mobile power supply is in a disconnected state, a second grid-connected switch is in a disconnected state, and field operation personnel are allowed by scheduling to live-wire lap the cable of the temporary mobile power supply in a live-wire operation mode and to grid the temporary mobile power supply in a first time (phase sequence checking).

4. As shown in fig. 3: an operator realizes primary grid-connected cable joint of the temporary mobile power supply at a point A on a demarcation point switch load side through live working, and then starts primary grid-connection: if the phase sequence is consistent, a ' first grid-connected switch ' button on a control screen is pressed, a controller in the temporary mobile power supply automatically detects the output deviation of the commercial power and the temporary mobile power supply, the temporary mobile power supply output power supply is automatically adjusted, when the temporary mobile power supply is synchronous with a system power supply, a synchronous meter pointer on the controller is aligned to the twelve o ' clock direction, and a breaker is automatically switched on; if the phase sequence is inconsistent, the control panel displays that the phase sequence is inconsistent, the lap joint sequence of the temporary mobile power primary grid-connected cable A, C at the point A needs to be adjusted in a live working mode until the phase sequence is consistent, and then a 'primary grid-connected switch' button on the control screen is pressed.

5. As shown in fig. 3-1: and pulling the 2# rod demarcation point switch open, supplying power to all overhead line loads by the temporary mobile power supply, pulling the outgoing cable interval switch and the 1# rod outgoing switch below the bus in the system power supply open, and transferring and replacing outgoing cables in a power failure mode.

6. As shown in fig. 4: and (3) switching on an outgoing cable interval switch and a No. 1 rod outgoing switch below a bus in the system power supply after the outgoing cable is moved and replaced due to the requirement of excavation and trimming, switching off a secondary grid-connected switch in the temporary mobile power supply, switching off a demarcation point switch, and scheduling to permit field operators to temporarily move the live lapping and the secondary grid-connected (nuclear phase sequence) of the secondary grid-connected cable of the power supply.

7. As shown in fig. 4: and a temporary mobile power supply secondary grid-connected cable joint is realized at a B point on the demarcation point switching power supply side through hot-line work, and the overlapping phase sequence of the temporary mobile power supply secondary grid-connected cable on the line is strictly consistent with the overlapping phase sequence of the temporary mobile power supply primary grid-connected cable on the line through flexible cable phase identification.

8. And then starting second grid connection: if the phase sequence is consistent, a ' secondary grid-connected switch ' button on a control screen is pressed, a controller in the temporary mobile power supply automatically detects the output deviation of the commercial power and the temporary mobile power supply, the temporary mobile power supply output power supply is automatically adjusted, when the temporary mobile power supply is synchronous with a system power supply, a synchronous meter pointer on the controller is aligned to the twelve o ' clock direction, and the secondary grid-connected switch in the temporary mobile power supply is automatically switched on; if the phase sequence is inconsistent, the control panel displays that the phase sequence is inconsistent, field operating personnel report that the phase of the dispatching and overhauling line section is incorrect, an outgoing line cable interval switch and a No. 1 rod outgoing line switch below a bus in the system power supply are pulled open, the outgoing line cable is corrected in a power failure mode, and then secondary grid connection is carried out through dispatching permission. At this time, as shown in fig. 4, the temporary mobile power supply second grid-connected switch is in a closed state, and the

users

1, 2, 3, 4, and 5 on the overhead line are simultaneously supplied with power by the temporary mobile power supply and the system power supply.

9. As shown in fig. 4: after the second grid connection is successful, the dispatching permits the operators to check the phases on the two sides of the 2# rod demarcation point switch, and if the phases are inconsistent, the operators report that the phases on the two sides of the 2# rod demarcation point switch are not correct. And (3) allowing field operators to disconnect the secondary grid-connected switch by scheduling, correcting the lap phase of the cable at the point B by adopting a live working mode, pulling open an outgoing cable interval switch below a bus and an outgoing switch of the 1# rod in a system power supply, correcting the phase of the outgoing cable by adopting a power failure mode, and then performing secondary grid connection and phase checking on two sides of the 2# rod demarcation point switch. And after the two sides of the 2# rod demarcation point switch check that the phases are correct, scheduling and permitting field operating personnel to close the 2# rod demarcation point switch.

10. As shown in fig. 5: the dispatching permits the field operator to quit power supply by the temporary mobile power supply: and sequentially pulling the first grid-connected switch and the second grid-connected switch of the temporary mobile power supply. And removing the primary grid-connected and secondary grid-connected cables of the temporary mobile power supply in a charged manner.

Above-mentioned process is because the mode that adopts interim portable power source to be incorporated into the power networks twice switches power supply to overhead line, and interim portable power source's the network connection and the off-line, the recovery process of system's power does not have the short-term power failure, and totally incessant power supply, the loss of number of households during the power failure is zero, compares and normally has a power failure and overhauls the aversion and change cable and need compare for several hours at least, and the loss of number of households when not producing the power failure has greatly improved power supply reliability and electric power operator environment.

For the condition that the outgoing line cable is repaired by the radiation structure overhead line with the outgoing line switch not at the head end, the following technical steps are adopted:

adopt the short-time power failure mode to overhaul cable of being qualified for the next round of competitions, include:

1. as shown in fig. 6: because the excavation and trimming area is on the outgoing cable path of the overhead line, the outgoing cable which is not at the head end of the overhead line needs to be shifted, replaced and reconnected, and at the moment, the mode of accessing the temporary mobile power supply is adopted to ensure the continuous power supply of the

users

1, 2, 3, 4 and 5 on the line.

2. As shown in fig. 6: starting the temporary mobile power supply, running in an idle state, enabling a primary grid-connected switch in the temporary mobile power supply to be in a disconnected state, and scheduling to permit field operation personnel to carry out live-line lapping on a primary grid-connected cable of the temporary mobile power supply in a live-line operation mode and carrying out primary grid connection (phase sequence checking).

4. As shown in fig. 6-1: after the primary grid connection is successful, a cable outlet interval switch and a 4# rod outlet switch below a bus in a system power supply are pulled open, and the outlet cable is shifted, replaced and reconnected in a power failure mode.

5. As shown in fig. 6-2, after the outgoing cable is moved, replaced and reconnected due to the need of excavation and trimming, the outgoing cable interval switch below the bus in the system power supply is closed, the phases are checked at two sides of the 4# rod outgoing switch, and if the phases are inconsistent at two sides of the 4# rod outgoing switch, the outgoing cable interval switch below the bus in the system power supply is opened, and the outgoing cable phase is corrected in a power failure mode. And if the cores on the two sides of the 4# rod outgoing switch are consistent, disconnecting the primary grid-connected switch in the temporary mobile power supply, and closing the 4# rod outgoing switch. At the moment, users 1-5 on the overhead line are supplied with power by a system power supply, the outgoing cable after replacement and the 4# rod outgoing switch.

In this embodiment, because the temporary mobile power supply switches the power supply of the overhead line in a primary grid-connected cold-falling mode, when the temporary mobile power supply is disconnected from the grid, a short-time power failure of several minutes can be generated in the system power supply recovery process, taking fig. 6-2 as an example, the longest time of 10 minutes is taken as an example from the disconnection of the primary grid-connected switch in the temporary mobile power supply to the reclosing of the 4# rod outgoing switch, the house number loss during power failure is 5 × 1/6 about 0.83 hours, compared with the normal power failure, cable replacement for maintenance and displacement, at least several hours are required, the house number loss during power failure is dozens of times compared, the house number loss during power failure is greatly reduced, and the power supply reliability and the power operator environment are effectively improved.

The completely uninterrupted power supply mode specifically comprises the following steps:

1. as shown in fig. 7: because the excavation and trimming area is on the outgoing cable path of the overhead line, the outgoing cable which is not at the head end of the overhead line needs to be shifted, replaced and reconnected, and the continuous power supply of the user 1, the user 2, the user 3, the user 4 and the user 5 on the line is ensured by adopting a mode of connecting two temporary mobile power supplies.

2. A4 # pole and a 4+1# pole of a base tower are respectively selected from the front and the rear of a 4# pole where an overhead line outgoing switch is located, strain is opened under the condition of live load in a live working mode, a demarcation point switch F1 and a demarcation point switch F2 are additionally arranged, and the demarcation point switches F1 and F2 are located at the closing positions.

3. The 4-1# pole and the 4+1# pole can be original poles and towers in front of and behind the 4# pole or electrified poles in an electrified operation mode.

4. The adjacent tower or the non-adjacent tower can be arranged between the 4# pole and the 4-1# pole and the 4+1# pole, and no user is arranged between the 4# pole and the 4-1# pole and the 4+1# pole.

5. As shown in fig. 7: the temporary mobile power supply I is started and operates in an idle state, a primary grid-connected switch in the temporary mobile power supply I is in a disconnected state, and dispatching permission field operating personnel adopt a live-line operation mode to lap the primary grid-connected cable of the temporary mobile power supply I in a live-line mode and conduct grid connection for the first time (phase sequence checking). Starting the temporary mobile power supply II, running in an idle state, enabling a primary grid-connected switch in the temporary mobile power supply II to be in a disconnected state, and dispatching field operating personnel to carry out live lapping on a primary grid-connected cable of the temporary mobile power supply II in a live working mode and carrying out primary grid connection (phase sequence checking).

6. The operator realizes the primary grid-connected cable joint of the temporary mobile power supply I at the load side A point of the demarcation point switch F1 through live working, and then starts to be connected to the grid for the first time: if the phase sequence is consistent, a ' first grid-connected switch ' button on a control screen is pressed, a controller in the temporary mobile power supply I automatically detects the output deviation of commercial power and the temporary mobile power supply I, the output power of the temporary mobile power supply I is automatically adjusted, when the temporary mobile power supply I is synchronous with a system power supply, a synchronous meter pointer on the controller is aligned to the twelve o ' clock direction, and the first grid-connected switch is automatically switched on; if the phase sequence is inconsistent, the control panel displays that the phase sequence is inconsistent, the lap joint sequence of the primary grid-connected cable A, C of the temporary mobile power supply I at the point A needs to be adjusted in a live working mode until the phase sequence is consistent, and then a primary grid-connected switch button on the control screen is pressed down. After the temporary mobile power supply I is successfully connected to the grid for one time, the users 1-5 on the overhead line are powered by the system power supply and the temporary mobile power supply I simultaneously.

7. The operator realizes the primary grid-connected cable joint of the temporary mobile power supply II at the load side C point of the demarcation point switch F2 through live working, and then starts to be connected to the grid for the first time: if the phase sequence is consistent, a ' first grid-connected switch ' button on a control screen is pressed, a controller in the temporary mobile power supply II automatically detects the output deviation of the commercial power and the temporary mobile power supply II, the temporary mobile power supply II starts to be automatically adjusted, when the temporary mobile power supply II is synchronous with a system power supply, a synchronous meter pointer on the controller is aligned to the twelve o ' clock direction, and the first grid-connected switch is automatically switched on; if the phase sequence is inconsistent, the control panel displays that the phase sequence is inconsistent, the lap joint sequence of the temporary mobile power supply II primary grid-connected cable A, C phase at the point C needs to be adjusted in a live working mode until the phase sequence is consistent, and then a 'primary grid-connected switch' button on the control screen is pressed down. After the temporary mobile power supply II is successfully connected to the grid for the first time, the users 1-5 on the overhead line are simultaneously supplied with power by the system power supply, the temporary mobile power supply I and the temporary mobile power supply II.

8. As shown in fig. 7-1: and respectively pulling open a 4-1# rod demarcation point switch, a 4+1# rod demarcation point switch, a 4# rod overhead line outgoing switch and an outgoing cable interval switch below a bus in a system power supply, and shifting, replacing and switching the outgoing cable in a power failure mode.

9. As shown in fig. 7-2: after the outgoing cable needs to be shifted, replaced and reconnected due to excavation and trimming, an outgoing cable interval switch and a 4# pole overhead line outgoing switch below a bus in a system power supply are closed, a second-time grid-connected switch in the temporary mobile power supply I is in a disconnected state, a demarcation point switch F1 and a demarcation point switch F2 are in disconnected positions, and field operating personnel are scheduled to allow live connection and second grid connection (nuclear phase sequence) of the first-time grid-connected cable of the temporary mobile power supply I.

10. As shown in fig. 7-2: the splicing of the I secondary grid-connected cable of the temporary mobile power supply is realized at a B point on a power supply side of a demarcation point switch F1 through hot-line work, and the overlapping phase sequence of the I secondary grid-connected cable of the temporary mobile power supply on a line is strictly consistent with the overlapping phase sequence of the I primary grid-connected cable of the temporary mobile power supply on a system line through flexible cable phase identification.

11. And then starting a second grid connection of the temporary mobile power supply I: if the phase sequence is consistent, a ' secondary grid-connected switch ' button on a control screen is pressed, a controller in the temporary mobile power supply I automatically detects the output deviation of commercial power and the temporary mobile power supply, the temporary mobile power supply output power supply is automatically adjusted, when the temporary mobile power supply I is synchronous with a system power supply, a synchronization table pointer on the controller is aligned to the twelve o ' clock direction, and the secondary grid-connected switch in the temporary mobile power supply I is automatically switched on; if the phase sequence is inconsistent, the control panel displays that the phase sequence is inconsistent, field operating personnel report that the phase of the dispatching and overhauling line section is incorrect, an outgoing line cable interval switch and a 4# rod outgoing line switch below a bus in the system power supply are pulled open, the outgoing line cable is corrected in a power failure mode, and then the temporary mobile power supply I is subjected to secondary grid connection through dispatching permission. At this time, as shown in fig. 7-2, the temporary mobile power supply i is in a closed state for the second time, and at this time, the user 1, the user 2, and the user 3 on the overhead line are powered by the temporary mobile power supply i and the system power supply. The

users

4 and 5 are powered by the temporary mobile power supply II.

12. As shown in fig. 7-2: after the temporary mobile power supply I is successfully connected to the grid for the second time, the dispatching permission allows operators to check the phase on two sides of a 4-1# rod demarcation point switch F1, and if the phase is inconsistent, the operators report that the phase on two sides of the 4-1# rod demarcation point switch F1 is incorrect. And (3) allowing field operators to disconnect the temporary mobile power supply I from the second grid-connected switch by scheduling, correcting the lapping phase of the cable at the B point by adopting a live working mode, correcting the phase of the outgoing cable by adopting a power failure mode after pulling an outgoing cable interval switch below a bus in a system power supply and a 4# rod outgoing switch, and then performing second grid-connection and phase checking on two sides of a 4-1# rod dividing point switch F1. After the two sides of the 4-1# rod demarcation point switch F1 check that the phases are correct, the dispatching permits the field operating personnel to close the 4-1# rod demarcation point switch F1. At the moment, the

users

1, 2 and 3 on the overhead line are simultaneously supplied with power by the temporary mobile power supply I and the system power supply. The

users

4 and 5 are powered by the temporary mobile power supply II.

13. As shown in fig. 7-3: after the 4-1# rod demarcation point switch F1 is in the closed position, pull open the first time switch that is incorporated into the power networks in interim portable power source I, the second time switch that is incorporated into the power networks in proper order. And removing the primary grid-connected and secondary grid-connected cables of the temporary mobile power supply I in a charged manner. Pressing "shut down" button, I shut down of interim portable power source, I withdraws from the power supply of interim portable power source. At this time, the

users

1, 2, and 3 on the overhead line are supplied with power from the system power supply. The

users

4 and 5 are powered by the temporary mobile power supply II.

14. As shown in fig. 7-3: after the temporary mobile power supply I quits power supply, at the moment, a second-time grid-connected switch in the temporary mobile power supply II is in a disconnected state, a demarcation point switch F2 is in a disconnected position, and field operation personnel are scheduled to allow live connection lap of the second-time grid-connected cable of the mobile power supply II and second-time grid connection (phase sequence checking).

15. As shown in fig. 7-3: and a D point on the power supply side of the demarcation point switch F2 is used for realizing the lapping of the temporary mobile power supply II secondary grid-connected cable through hot-line work, and the lapping phase sequence of the temporary mobile power supply II secondary grid-connected cable on the line is strictly consistent with the lapping phase sequence of the temporary mobile power supply II primary grid-connected cable on the system line through the flexible cable phase identification.

16. And then starting a second grid connection of the temporary mobile power supply II: if the phase sequence is consistent, a ' secondary grid-connected switch ' button on a control screen is pressed, a controller in the temporary mobile power supply II automatically detects the output deviation of the commercial power and the temporary mobile power supply, the temporary mobile power supply output power supply is automatically adjusted, when the temporary mobile power supply II is synchronous with a system power supply, a synchronous table pointer on the controller is aligned to the twelve o ' clock direction, and the secondary grid-connected switch in the temporary mobile power supply II is automatically switched on; at this time, as shown in fig. 7-3, the temporary mobile power supply II is in a closed state for the second time, and the

users

1, 2, 3, 4, and 5 on the overhead line are simultaneously supplied with power by the temporary mobile power supply II and the power supply.

17. As shown in fig. 7-3: after the operator is allowed to schedule and check the phase is correct on the two sides of the 4+1# rod demarcation point switch F2, the operator is allowed to schedule and close the 4+1# rod demarcation point switch F2. on the scene, and at this moment, the

users

1, 2, 3, 4 and 5 on the overhead line are supplied with power by the temporary mobile power supply II and the power supply simultaneously.

18. As shown in fig. 7-4: the dispatching permits the field operator to quit power supply by the temporary mobile power supply II: and sequentially pulling open a first grid-connected switch and a second grid-connected switch of the temporary mobile power supply II. And removing the primary grid-connected and secondary grid-connected cables of the temporary mobile power supply II in a charged manner. And pressing a stop button, stopping the temporary mobile power supply II, and stopping the power supply of the temporary mobile power supply II. At this point,

users

1, 2, 3, 4, 5 on the overhead line are restored to being powered by the system power supply.

In the embodiment, because the power supply of the overhead line is switched by adopting the mode that the temporary mobile power supply I and the temporary mobile power supply II are respectively connected with the power grid for the second time, the temporary mobile power supply is connected with the power grid and disconnected from the power grid, the system power supply is recovered without short-time power failure, completely uninterrupted power supply is realized, the number of users is zero during power failure, the number of users is compared with the number of users during normal power failure for overhauling, shifting and replacing cables at least for several hours, the number of users is not lost during power failure, and the power supply reliability and the power operator environment are greatly improved.

The method for replacing the outgoing cable by using the temporary mobile power supply can be used for not only the displacement replacement and the reconnection of the outgoing cable, but also the displacement replacement and the reconnection of an overhead line part between an outgoing switch and a demarcation point switch in a power failure mode.

In the method for replacing the outgoing cable by using the temporary mobile power supply, the temporary mobile power supply can be a generator car or a generator set and the like and is not limited to a certain fixed form. The demarcation point switch can be removed with a load by adopting a live working mode after all the operations are finished, and the normal segmentation and operation modes of the overhead line are not influenced.

The sequence numbers in the above embodiments are merely for description, and do not represent the sequence of the assembly or the use of the components.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. The outgoing cable overhauling method based on the application of the temporary mobile power supply is characterized by comprising the following steps of:

step 6, overlapping a temporary mobile power supply secondary grid-connected cable on the commercial power side of the demarcation point switch in a live working mode, starting secondary grid connection, and judging whether to perform automatic switch-on operation on a secondary grid-connected switch in the temporary mobile power supply or not based on the phase sequence checking result of the temporary mobile power supply and the system power supply;

step 7, after the secondary grid connection is finished, after the phases are checked on two sides of the demarcation point switch, the demarcation point switch is closed, the primary grid connection cable and the secondary grid connection cable are withdrawn in sequence, and finally the temporary mobile power supply is removed;

the outgoing cable maintenance method is suitable for the situation that the outgoing cable is maintained by the radiation structure overhead line of the outgoing switch at the head end and the situation that the outgoing cable is not maintained by the radiation structure overhead line of the outgoing switch at the head end;

each case comprises two processing methods of completely uninterrupted power supply and short-time power failure;

when the completely uninterrupted power supply processing method is adopted under the condition that the outgoing cable is not repaired on the radiation structure overhead line at the head end of the outgoing switch, the steps comprise:

selecting a base tower from the front end and the rear end of a radiant overhead line outgoing switch rod, carrying out live-line on the base tower in a live-line operation mode to open strain, and respectively installing two demarcation point switches;

starting the two temporary mobile power supplies, running in an idle state, enabling a primary grid-connected switch in the two temporary mobile power supplies to be in a disconnected state, and respectively overlapping primary grid-connected cables of the two temporary mobile power supplies to a load side of a demarcation point switch in an electrified operation mode to prepare for primary grid connection;

respectively overlapping two temporary mobile power supply primary grid-connected cables on the load sides of the two demarcation point switches in a live working mode, starting primary grid connection, and judging whether to perform automatic switch-on operation on a primary grid-connected switch in the temporary mobile power supply or not based on a phase sequence checking result of the temporary mobile power supply and a system power supply;

after the two temporary mobile power supplies are successfully connected to the grid once, the two demarcation point switches are respectively pulled open, and the two temporary mobile power supplies are used for supplying power to the user; disconnecting the outgoing cable interval switch and the outgoing switch below the bus in the system power supply, and performing displacement, replacement and reconnection on the outgoing cable in a power failure mode;

on the day of power failure maintenance, the outgoing cable is shifted, replaced and reconnected as required by excavation and trimming, and the outgoing cable interval switch and the overhead line outgoing switch below the bus in the system power supply are closed; selecting a first temporary mobile power supply to carry out secondary grid connection, after the secondary grid connection is successful, carrying out phase checking on two sides of a first demarcation point switch corresponding to the first temporary mobile power supply, wherein the phases are inconsistent, and allowing field operators to disconnect a second grid connection switch by scheduling and correct the lap joint phase of a secondary grid connection cable of the first temporary mobile power supply by adopting a live working mode; the phases are consistent, and after the first demarcation point switch is closed, the first time grid connection switch and the second time grid connection switch of the first temporary mobile power supply are sequentially opened; removing the primary grid-connected cable and the secondary grid-connected cable in a live-line operation mode, and quitting the first temporary mobile power supply from running;

secondly, performing secondary grid connection on a second temporary mobile power supply, after the secondary grid connection is successful, performing phase checking on a second demarcation point switch corresponding to the second temporary mobile power supply, wherein the phases are inconsistent, allowing field operators to disconnect the second grid connection switch by scheduling and correcting the lap joint phase of a secondary grid connection cable of the second temporary mobile power supply by adopting a live working mode, and adjusting the phase of an overhead line part between an outgoing switch rod and the second demarcation point switch by adopting the live working mode; after the second demarcation point switch is closed, sequentially opening a first grid-connected switch and a second grid-connected switch in the second temporary mobile power supply; and removing the primary grid-connected cable and the secondary grid-connected cable in a live-line operation mode, and quitting the second temporary mobile power supply.

2. The outgoing cable overhauling method based on temporary mobile power supply application as claimed in claim 1, wherein when the completely uninterrupted power supply processing method is adopted in case of overhauling the outgoing cable by aiming at the outgoing switch in the case of the radiation structure overhead line at the head end, the steps 6 and 7 comprise:

3. The outgoing cable overhauling method based on the temporary mobile power supply application as recited in claim 2, wherein when the completely uninterrupted power supply processing method is adopted, the outgoing cable overhauling method further comprises:

after the boundary point switch is successfully connected to the grid, a first grid-connected switch and a second grid-connected switch in the temporary mobile power supply are sequentially pulled; and (3) removing the primary grid-connected and secondary grid-connected cables of the temporary mobile power supply in a live-line operation mode, and stopping the temporary mobile power supply and quitting power supply.

4. The outgoing cable overhauling method based on the temporary mobile power supply application as claimed in claim 2, wherein when the short-time power failure processing method is adopted for the outgoing switch under the condition of the outgoing cable overhauling of the overhead line with the radiation structure at the head end, the steps further comprise:

after the outgoing cable is shifted, replaced and reconnected in a power failure mode in the step 5, the outgoing cable interval switch below the bus in the system power supply and the outgoing switch of the overhead line are closed, or the commercial power is connected and the temporary mobile power supply is withdrawn in a cold pouring mode: the phase positions of the cores on the two sides of the demarcation point switch are checked, if the phase positions are incorrect, an outgoing cable interval switch and an outgoing switch below a bus in a system power supply are pulled open, and the phase positions of outgoing cables are corrected in a power failure mode; after the phase is correct, a primary grid-connected switch in the temporary mobile power supply is pulled open, a user has a power failure for a short time, a demarcation point switch is closed, the user recovers power supply, the temporary mobile power supply is stopped, a primary grid-connected cable of the temporary mobile power supply is detached in a live-line operation mode, and the temporary mobile power supply is stopped and exits operation.

5. The outgoing cable overhauling method based on the temporary mobile power supply application as claimed in claim 2, wherein when the processing method of the short-time power failure is adopted in case of overhauling the outgoing cable by aiming at the outgoing switch in the radiation structure overhead line at the head end, the step of not using the demarcation point switch is further adopted:

before construction, firstly selecting a tower suitable for accessing a temporary mobile power supply on a radiation overhead line, starting the temporary mobile power supply, running in an idle state, enabling a primary grid-connected switch in the temporary mobile power supply to be in a disconnected state, and carrying out live-wire lapping on a primary grid-connected cable of the temporary mobile power supply on the tower suitable for accessing the temporary mobile power supply on the radiation overhead line in a live-wire operation mode to prepare for primary grid connection;

judging whether to automatically switch on a primary grid-connected switch in the temporary mobile power supply or not based on the phase sequence checking result of the temporary mobile power supply and the system power supply;

the original outgoing line switch of the overhead line is pulled open, and a user supplies power by a temporary mobile power supply; disconnecting an outgoing cable interval switch below a bus in a system power supply, and performing displacement, replacement and reconnection on the outgoing cable in a power failure mode; the aversion is changed and is changed to connect and finish, adopts the cold mode of falling to carry out commercial power and inserts and temporary portable power source's work of withdrawing from: closing an outgoing cable interval switch below a bus in the system power supply, checking positions on two sides of the outgoing cable interval switch, if the phase is incorrect, pulling open the outgoing cable interval switch below the bus in the system power supply, and correcting the phase of the outgoing cable in a power failure mode; after the phase is correct, a primary grid-connected switch in the temporary mobile power supply is pulled open, a user has power failure for a short time, an original outlet switch is closed, the user recovers power supply, the temporary mobile power supply is stopped, a primary grid-connected cable of the temporary mobile power supply is detached in a live-line operation mode, and the temporary mobile power supply is stopped and exits operation.

6. The outgoing cable overhauling method based on the temporary mobile power supply application as claimed in claim 1, wherein when the processing method of the short-time power failure is adopted under the condition that the outgoing cable is overhauled for the radiating structure overhead line of which the outgoing switch is not at the head end, the steps comprise:

the original outgoing line switch of the overhead line is pulled open, and a user supplies power by a temporary mobile power supply; disconnecting an outgoing cable interval switch below a bus in a system power supply, and performing displacement, replacement and reconnection on the outgoing cable in a power failure mode; the replacement of shifting is changed and is connect to finish, adopts the cold mode of falling to carry out commercial power and inserts and temporary portable power source's work of withdrawing from: closing an outgoing cable interval switch below a bus in the system power supply, checking positions on two sides of the outgoing cable interval switch, if the phase is incorrect, pulling open the outgoing cable interval switch below the bus in the system power supply, and correcting the phase of the outgoing cable in a power failure mode; after the phase is correct, a primary grid-connected switch in the temporary mobile power supply is pulled open, a user has power failure for a short time, an original outlet switch is closed, the user recovers power supply, the temporary mobile power supply is stopped, a primary grid-connected cable of the temporary mobile power supply is detached in a live-line operation mode, and the temporary mobile power supply is stopped and exits operation.