JP2720048B2 - Distribution line protection relay device and distribution line device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a distribution line protection relay device, and specifically detects a distribution line accident such as a ground fault accident or a short circuit accident, and includes the point of the accident. The present invention relates to a method for separating a section (accident section) to eliminate an accident of a distribution line.

[Conventional technology]

2. Description of the Related Art Conventionally, when an accident occurs in a distribution line, a "segmented switch for automatic detection of a faulted section" is used to quickly separate a healthy section from an accident section. According to this, after all the segment switches have been opened due to the occurrence of an accident, each segment switch is automatically re-closed sequentially at preset time intervals, and the distribution line outlet of the substation is opened. When an accident was detected by the installed protective relay, the circuit breaker at the distribution line outlet was immediately opened and the section switch that was re-closed immediately before to determine which section had the accident. Things. Then, power supply to a healthy section other than the accident section is restored quickly.

[Problems to be solved by the invention]

However, the conventional method described above has a problem that if the time of the first accident detection is coincident with the time of the accident section detection, a power failure occurs twice in a healthy section. In addition, there is a problem that recovery takes time.

Also, the method proposed in Japanese Patent Application No. 61-162224 has a problem that one power outage is required.

Further, according to the conventionally known pilot wire relay system, it is possible to eliminate only an accident section and eliminate unnecessary power failure in a healthy section. However, since a pilot wire needs to be provided, there is a problem that construction and maintenance work for the pilot wire are expensive.

Conventionally, when performing forward power transmission by sequentially closing the switches of each section opened due to an accident, in order to prevent a power outage caused by re-energizing the section including the accident point, the switching operation is performed. The devices are sequentially reclosed at regular time intervals (forwarding time period). Generally, there is a problem that it takes a long time to recover from a power failure due to the long forward time.

An object of the present invention is to provide a distribution line protection relay device that can substantially reduce the number of power failures in a sound section for detecting and disconnecting an accident section of a distribution line without using a pilot wire. is there.

Another object of the present invention is to provide a distribution line protection relay device capable of shortening the time required for progressive power transmission and shortening the power outage time.

[Means for solving the problem]

In order to achieve the above object, a distribution line protection relay device of the present invention provides a switch distributed in a distribution line with an accident detection relay in a distribution section divided by the switch, and operates the accident detection relay. After that, a coordination timer that outputs an open command to the switch after a predetermined settling time is provided, and a coordination time difference is provided so that the settling time of the coordination timer of each switch becomes shorter as the distance from the power supply end of the distribution line increases. It is to become.

In addition, an accident detection relay including a short-circuit accident detection in a distribution section divided by the switch is provided in a switch distributed in the distribution line, and the switch is operated after a predetermined settling time after the accident detection relay operates. The switch is provided with a coordination timer that outputs an opening command, and the settling time of the coordination timer is variably set in proportion to the line voltage of the distribution line at the installation point of the switch. is there.

In addition, an accident detection relay in a distribution section divided by the switch is provided in a switch distributed in the distribution line, and an opening command is issued to the switch after a predetermined settling time after the operation of the accident detection relay. An output coordination timer is provided, and the settling time of the coordination timer is increased according to the elapsed time for a predetermined time after the switch is closed.

[Action]

With this configuration, the object of the present invention is achieved by the following operation.

First, an accident detection relay is provided in the switch to open the switch, and a coordination time difference is set so that the settling time of the coordination timer for coordinating the operation of each switch becomes shorter as the distance from the power supply end increases. As a result, the switch closest to the accident point was immediately activated to disconnect the accident section,
The switch on the power supply end side does not operate due to the cooperative time difference. Thereby, a power failure in a healthy section is avoided. Further, since processing can be performed only by the cooperative time difference, equipment such as a pilot wire is not required. In addition, the present invention can be applied to continuous accidents such as ground fault accidents and short circuit accidents as accidents to be protected.

Here, the above cooperative time difference is ΔT (n) (where n represents the n-th switch counted from the power supply end)
In this case, it is desirable to set the value to satisfy the following equation: ΔT (n)> ts (n + 1) + t _R (n) (1) In the above equation
t _R (n) is the recovery time of the accident detection relay of the switch, ts
(N + 1) is the open response time of the switch one power supply side away from the switch.

With this setting, the switch (n +
After 1) is opened, that is, after ts (n + 1), the coordination timer expires after the accident detection relay of the switch is restored, so that the opening command is not reliably output to the switch.

Further, the value that satisfies the following equation the cooperative time difference ΔT (n) ts (n + 1) + t R (n)> ΔT (n)> ts (n + 1) -ts (n) + t R (n) ... (2) Can be set. Note that ts
(N) is the opening response time of the switch.

According to this, since the coordination timer expires before the accident detection relay of the switch (n) returns, the switch (n) is opened following the switch (n + 1) near the accident point. In this case, the healthy section is also cut off. However, if the switch is restarted immediately after the chase release, the power outage time can be reduced to an extremely short time. This reclosing is performed by judging whether or not the accident detection relay has returned before the switch is opened. If the judgment is affirmative, a reclosing control is output to the switch after a predetermined time. This can be achieved by providing means.

Thus, according to this, the lengthening of the settling time when the number of serial switches increases increases, and coordination can be facilitated.

Further, in the case of removing the short-circuit accident, there is a case where the cooperative time difference ΔT (n) shown in the above equation (1) cannot be sufficiently secured.
In this case, it is determined whether or not the operation of the fault detection relay is due to a short-circuit fault, and if the determination is affirmative, after the switch is opened, it is determined whether or not there is a voltage on the distribution line on the power supply end side of the switch. If the judgment is positive, a re-closing command is output to the switch after a predetermined time, and if the accident detection relay operates again due to a short-circuit fault after the re-closing by the command, the switch is prevented from being closed. By providing the forward re-closing means, the section before the accident section can be recovered by a single short-time blackout.

Further, according to the configuration in which the settling time of the coordination timer of each switch is variably set in proportion to the distribution line voltage at the installation point of the switch, the distribution line voltage at the time of a short-circuit fault approaches the fault point. Therefore, by appropriately selecting the proportionality coefficient, the above-described coordination can be sufficiently achieved. In addition, as the accident point approaches the power supply terminal, the opening time of the switch near the power supply terminal is automatically shortened, and reasonable coordination can be achieved.

In this case as well, when a plurality of switches are chased and opened, the above-mentioned sequential-feed restart path control means may be provided. Also,
According to the configuration in which the settling time of the coordination timer is increased in accordance with the elapsed time during a predetermined time after the switch is closed, when the distribution line including the accident point is subjected to progressive power transmission,
Even in the case of an accident condition (for example, a ground fault accident) where it takes time before the occurrence of an accident after the application of power, it is possible to reduce the power failure time by shortening the forward time interval (forward time period) sufficiently. On the other hand, it can be operated promptly in the event of a short circuit accident.

In this case, if the characteristic is set so as to operate instantaneously at the beginning of the elapsed time, the short circuit accident can be eliminated more quickly.

〔Example〕

 Hereinafter, the present invention will be described based on examples.

FIG. 1 shows a system configuration of a 6.6 KV distribution line according to an embodiment to which the present invention is applied. Substation transformer 1 as shown
Power is supplied to a plurality of distribution lines 3 and 4 via a power bus 2 of 6.6 KV. At the outlets of the substations of the distribution lines 3 and 4, there are provided outlet switches CB each having an interrupting ability. The distribution line 3 switches SW ₁ to SW ₄ are distributed appropriately, similarly to the distribution line 4 sectionalizing switches SW ₅ to SW ₇ is provided, thereby such distribution leg L ₁ ~L ₆ is defined Have been. The switch SW ₁ to SW ₇ applies those pole shape, for example.
Distribution leg L ₄ and L ₆ are connected via the switch SW _8,
Power can be sent back to each other as needed.

Each switch CB distribution line 3, SW ₁ ~SW ₄ transformer FCT for fault detection in the installation point, CT ₁ to CT ₄ are provided, respectively. As these transformers, a current transformer, a zero-phase current transformer, or a voltage transformer, a zero-phase voltage transformer, or the like is provided as necessary. Each transformer FCT, the state quantity of the detected distribution line by CT ₁ to CT ₄ (current, voltage, zero-phase current, etc.), the corresponding fault detection relay FRY, is input to the RY ₁ ~RY _4. Each fault detection relay is configured to include an overcurrent relay, a zero-phase overcurrent relay, a ground fault direction relay, and the like as necessary. Command signal opening command or the like output from the fault detection relay is inputted coordinated timer FTL, the TL ₁ ~TL _4. Each cooperating timer is made after receiving relay operation signal after the settling time, the switch CB, and outputs a command signal to the SW ₁ to SW _4. Settling time T _F , T ₁ -T ₄ for each coordination timer FTL, TL ₁ -TL ₄
Is provided with a time difference (hereinafter referred to as a cooperative time difference) so as to become shorter as the distance from the power supply end increases.

That is, the relations are T _F > T ₁ > T ₂ > T ₃ and T _F > T ₁ > T ₄ . Incidentally, although not shown, it is configured similarly also switch CB, SW ₅ to SW ₇ relation distribution line 4.

The operation of the embodiment configured as described above will be described with reference to the operation timing chart of each unit shown in FIG. This figure illustrates by way of example a case that occurred in accident point F of distribution leg L _3. Therefore, the systems of the switches SW ₃ and SW ₄ and the distribution line 4 which are not directly related are omitted.

Now, when an accident occurs in the t ₁ at point F, the accident detection relay FRY, RY _1, RY ₂ is substantially as the same fault current flows, substantially simultaneous operation. t of settling time T ₂ after a lapse in time t ₂ from the output of the operation signal from the RY _{2 3} o'clock switch SW ₂
An open command is output. Thus opening action of the switch SW ₂ is started, (at t ₄₎ only the opening response time ts delay is opened, the interval L ₃ having a fault point F is disconnected. Therefore, this allows the accident detection relays RY ₁ and FRY
Returns, the switches SW ₁ and CB are not opened, and the healthy section L ₁ ,
L ₂ and L ₅ continue power distribution without power outage.

Here, coordinated time difference ΔT for switch SW ₁ does not open the from switch SW ₂ 1 single power source terminal side, as is apparent from the figure, the accident detection relay according to the opening response time ts and the SW ₁ of the SW ₂
It is a condition is RY ₁ of the sum of the recovery time t _R (ts + t _R) or more. The same applies to the switch CB. In addition,
The second illustrated example is for an open response time ts of the switch, the recovery time t _R and operating characteristics of the accident detection relay shown as substantially equal.

 This condition is generalized and expressed as follows.

Let ΔT (n) be the cooperative time difference between a certain switch (n) and one switch (n + 1) on the side opposite to the power supply end, and let t _R (n) be the return time of the fault detection relay of the switch (n). Assuming that the open response time of the switch (n + 1) is ts (n + 1), if the condition shown in the above formula (1) is satisfied, only the accident section is separated, and the power failure in the healthy section closer to the power supply end than the section is performed. Can be prevented.

On the other hand, distant section L ₄ onward when viewed from the fault section L ₃ is disconnected power terminal becomes the power failure. This is similar to the conventional, the switch SW ₃ and the like of the section L ₄ beyond the line voltage of the distribution line is automatically opened under the condition "no" more than a predetermined time.
To recover the power failure of the system may be a so-called reverse transmission by closing the switch SW ₈ in conjunction with a distribution line 4 as in the prior art other systems. Condition that the opening and closing control of the switch SW ₈ detects, for example, both sides of the voltage of the switch SW ₈ by a voltage transformer PT _L, is one of a predetermined time or more by the controller 6 based on this "no voltage" To close the circuit. Alternatively, it may be controlled automatically by a remote control device using a computer or manually by a judgment of an operator. In this way, a power failure in a healthy section beyond the accident point F is eliminated.

As described above, according to the present embodiment, the accident section is quickly separated by the accident detection relay provided in the switch immediately near the accident point. Moreover, since the switch on the power supply end side of the switch is prevented from opening due to the cooperative time difference,
Unnecessary power outage in a healthy section for detecting an accident section can be prevented, and the time required for accident processing can be significantly reduced. In addition, as a result, a power failure can be promptly restored by reverse power transmission in a healthy section other than the accident section.

In the above-described embodiment, when the number of switches arranged in a distributed manner on the distribution line 3 or 4 is increased, the closer the switch is to the power supply end, the longer the fault elimination time is. That is, when the number of the series switches is n, the settling time T _F of the switch CB is represented by the following equation (3).

Now, if the open response time ts of each switch is all the same and the return time t _R of each fault detection relay is all the same, T _F
Is (ts + t _R + α) × n or more. Here, α is a margin time.

Specifically, assuming that ts + 50 ms, t _R +50 ms, and α = 10 ms, the cooperative time difference ΔT per switch becomes 110 msec.

Normally, a ground fault relay for distribution lines in a substation is provided with a timer of about 500 ms, so that the number of series switches (n) is four.
In cases of ~ 5, there is no particular problem even if the above embodiment is applied. A problem arises when there are more switches than this.

In this case, the power outage time can be significantly reduced for most distribution lines having 10 or less series switches by applying the embodiment method described below.

FIG. 3 shows an operation timing chart of the protection relay system corresponding to the case where the number (n) of series switches is 5 or more. The difference from the embodiment of FIG. 2 lies in that the cooperative time difference ΔT is shortened and settled so as to satisfy the condition of the following equation (4).

_{(Ts + t R + α)} >Δt> t R ...... (4) by settling in this manner, t ₄ at SW ₂ after ts an open command to the SW ₂ is issued is opened, RY ₁ at then t _R but but to return, TL ₁ at the front of the t ₆ is the time is up, SW ₁
An open command is issued in pursuit of this. By issuing a command to reclose the switch SW ₁ after the predetermined time θ, the power failure can be reduced for a short time (for example, 100 to 200 ms).
ec). On the other hand, the power supply end than SW ₁ close CB cooperative timer TL _F is if not timed are avoided outage interval L _1. Further, SW ₄ which branches from the section L ₂ is because generally the set time of no-voltage open is set greater than the theta, section L ₅ without being opened is stopped in a short time power failure.

When the above set time is shown as a specific example, ts = 50 msec, t _R = 5
At 0 msec, ΔT can be set to about 60 msec, and the number of series switches can be increased as compared with the example in FIG.

Here, the general formula of the above formula (4) is expressed by the above formula (2).
Becomes

In the above-described embodiment, the cooperative time difference ΔT is provided,
Since the opening time of the switch on the power supply end side is sequentially delayed, it is needless to say that the present invention is effective when applied to a distribution system that can tolerate this delay. However, in general, most accidents in the distribution system are single-line ground faults.
Focusing on (90% or more), it can be said that even if the opening time of the switch is delayed to some extent, it is more profitable to minimize the blackout section.

Next, a description will be given of a specific device configuration when the above embodiment is applied to a ground fault accident protection relay device.

FIG. 4 shows an overall configuration around a pole switch according to an embodiment to which the present invention is applied. In the figure, when SW energizes the closing coil CC with a pole switch, the main contacts 11 (11a, 11b, 11c) are closed against the spring 12, and the stopper 14 is hooked on the hook 13 to maintain the closed state. It has become. On the other hand, when the opening coil TC is excited, the stopper 14 comes off, and the main contact 11 is pulled back by the spring 12, and becomes open.

The contact 15 is an auxiliary contact that opens and closes with the main contact. Tr
Is a control power transformer, which is connected to the A-side distribution lines A1 and A3 of the switch SW and obtains a control power of, for example, 100 V from a distribution voltage of 6.6 KV. The REC is a rectifier and supplies control power for the control device CONT, the closing coil CC, and the opening coil TC. The PD inserted between the distribution line and the ground obtains the zero-phase voltage Vo of the distribution system by the capacitor partial voltage.

ZCT is a zero-phase transformer that extracts the zero-phase current Io flowing through the distribution line. The outputs Vo and Io of PD and ZCT are led to CONT, where they are used to determine the presence or absence of a ground fault. CX and TX are auxiliary relays for outputting the closing and opening commands of the switch SW, and the switches are controlled to open and close by respective contacts CX-a and TX-a.

FIG. 5 shows a functional block diagram of the control device CONT. FIG. 6 shows a timing chart of the operation timing of CONT. In Fig. 5, the ground fault relay DG that inputs Vo and Io operates when the ground fault that has occurred in the distribution line is on the opposite side of the power supply end from ZCT, and does not operate when it is on the power supply end side. This is a ground fault accident detection relay with a characteristic. Cooperation timer
TL is for opening switch SW after settling time T after DG operates.
Outputs the open / close command TX to the TX relay. This enables the switch SW
Is opened, the auxiliary contact 15 is opened. The computing unit 16 receives the "open" and "closed" states of the auxiliary contact 15 and the presence / absence of an open command, and outputs a signal 17 at a timing immediately before the opening in consideration of the open response time ts of the switch SW which is known in advance. It has become. The logic gate 18 outputs the signal 19 only when the signal 17 is “present” and when there is no operation signal of the DG relay. The reclosing timer 20 is started by inputting the auxiliary contact 15 and the opening command TX similarly to the calculator 16, and when the signal 19 is output, the CX relay is operated after a predetermined time period θ after the switch SW is opened. A closing command CX is issued.

The operation unit 16, the logic gate 18, and the reclosing timer 20 constitute a reclosing control means 21.

That is, as described in FIG. 3, when the switch SW ₁ is interrupted chase, the since the open circuit immediately before a ground fault of the system are removed DG relay is restored, the signal 19 is outputted since, SW ₁ is adapted to reclose after a predetermined reclosing time theta.

Here, the setting conditions of the settling time T of the coordination timer TL are as shown in the above equation (2). That is, as shown in FIG. 6, one than the switch counter supply terminal side of the switch (hereinafter, front switches) from time t ₁₃ which is opened, DG relay of the switch is restored Taking a longer settling time T than at t _15, the switch is a problem of reclosing from not open does not occur. However, the conditions shown in equation (2) is the settling time T and shorter settling than at the timing t ₁₅ to DG relay returns, which increases the number of series switch, is interrupted chasing According to this Therefore, reclosing control as described above is required.

The opening response time t 'of the switch SW shown in FIG.
s is the true value, in this document, are treated as open response time Ts of the switch SW thereto, including the response time t _x such TX relay.

In addition, in the example of FIG. 5, when determining whether or not the ground fault has been eliminated just before the switch SW is opened, the return signal of the DG relay is input to the logic gate 18 and the determination is made.
Instead of the return signal of the relay, it is also possible to use a signal indicating that V ₀ or I ₀ is exhausted. In this case, t _{R in the above} equation (3) or (4) is the return time of V ₀ or I ₀ .

Further, in the embodiment of FIG. 4, the case where PD, ZCT, and Tr are provided only on the A side is shown.
Both may be used. Also, it may be OCG relay has been a DG relay having a direction property as a relay ground fault detecting operating in the size of just a I ₀ in dendritic distribution lines (ground fault overcurrent relay).

When the power supply end side viewed from the switch SW is on either the A side or the B side (that is, when power is transmitted from an adjacent power supply to a section beyond the fault point, etc.), a ground fault relay and a timer are connected. What is necessary is just to provide in each direction. Further switch
When the SW does not have a capacity to cut off an excessive current such as a short-circuit fault current, an opening operation of the switch is prevented by an instantaneous operation type overcurrent relay, and the operation is left to the CB of the substation. Therefore, in a switch having a large breaking capacity, the present invention can be applied to an accident that progresses from a ground fault to a short circuit, and the power outage time can be greatly reduced.

In the above embodiment, only the ground fault has been described. However, the present invention can be applied to a short circuit accident.

However, in the event of a short circuit, the switch for the outlet of the substation
Since there is a possibility that a command to cut off (open) the CB may be sent too late, it is necessary to make the cooperative time difference ΔT as short as possible.
In this case, there is a possibility that a plurality of healthy sections on the power supply side than the accident section will have a power failure. However, in this case, as described below, the power can be restored immediately by sequentially re-closing the circuit.

That is, it is determined whether or not the open command is due to a short circuit accident, and in the case of an affirmative determination, the re-closing is sequentially performed from the power supply end side on the condition that there is a line voltage of one side distribution line in both sections of the switch SW. To do it. Then, when the short-circuit accident is detected again after the reclosing, it can be determined that there is a short-circuit accident point in the distribution section to which power is applied by the reclosing. Therefore, the switch is opened and the subsequent closing is prevented (interlocked).

Here, another embodiment of the cooperative time difference for a short circuit accident will be described. In general, the distribution line is thinner as it goes to the end, and it is often long distance,
If the cooperative time difference ΔT is determined in proportion to the magnitude of the line voltage, an open command for a short-circuit accident is output as soon as the terminal is reached, and conversely, as soon as the power supply is approached. In particular, when the accident point is close to the power supply end, the opening command time for automatically opening / closing the vicinity is automatically shortened, and it is possible to always maintain optimal timed coordination according to the accident point.

One embodiment of this specific protection relay device is shown in FIG. As shown in the figure, a current is detected by a transformer CT provided on the distribution line 3 and input to the overcurrent relay OC.
The operation signal of the overcurrent relay OC is input to the coordination timer TL '. In addition, the line voltage of the distribution line 3 detected by the transformer Tr is connected to the rectifier
It is converted to DC by REC and input. The coordination timer TL 'outputs a switching command to the switch SW after a predetermined settling time from the input of the OC operation signal (short circuit accident detection signal). This settling time is variably set in proportion to the line voltage input via the REC. Therefore, as the line voltage is higher nearer the power supply end than the short-circuit fault point, the settling time is longer. The switch SW has the same configuration as that of FIG. As the coordination timer TL ', an analog timer formed by combining a CR integrator and a comparator, or a digital timer formed by a microcomputer or the like can be applied.

In this embodiment, it is possible to satisfy the above expression (1) or (2) by appropriately designing the proportionality coefficient for the variable setting, and to automatically open as the short-circuit fault point approaches the power supply terminal. A preferable characteristic that the command is output in a short time is obtained.

Further, in the section on the power supply end side than the section including the accident point, only a power outage for a very short time without a power outage is required.

For the voltage farther than the accident section, either close the switch separately from the adjacent power section and use it sequentially, or use the switch at the abutment point and apply the sequential power transmission after a predetermined time limit as in the past. Can eliminate the power outage.

Next, a description will be given of an embodiment suitable for application in the above-described progressive power transmission method.

In general, the forward power application operation of a switch when starting operation of a distribution line, or the re-power operation by forward or reverse feed, requires a forward transmission time limit of about 10 seconds as an accident response in the power application section. Has become.

This is because the distribution lines are mostly insulated wires, and in view of the fact that there are more accidents that gradually develop after the application of electricity than metal accidents, there is an empirical time difference before applying electricity to the next section. The determination of is ensured. That is, if switches are sequentially turned on for 10 seconds or less, for example, at intervals of 2 seconds, an accident that occurs 6 seconds after power application may be mistaken for a section accident in which power was applied last.

Therefore, according to the conventional time-sequential power transmission system, the power supply up to the end of the distribution line is completed by (number of switches having the function of time-sequential transmission) × (progressive time period). It takes time. As a result, there is a problem that the power outage time becomes longer. Also, if the power outage time is to be shortened, there is a limit to the number of switches provided with the function of timed sequential transmission, and there is a problem that the protection section (power outage section) becomes long.

An embodiment for solving such a problem is shown in FIGS.
This will be described with reference to FIG.

FIG. 8 is a diagram showing the overall configuration around a pole switch to which this embodiment is applied. It has substantially the same configuration as that of the embodiment shown in FIG. 4, except that a short-circuit fault detection is additionally provided, and a transformer CT for detecting a line current is provided.
The control device CONT 'has a different configuration from that of FIG. 4, and FIG. 9 shows a detailed block diagram thereof.

As shown in FIG. 9, the line current I detected by the transformer CT
Is input to the overcurrent relay OC. This OC is designed to output an operation signal when I becomes larger than a preset current value. This operation signal is ORed with the operation signal of the ground fault direction relay DG.
Is input to the coordinating timer TLR including a variable timer via the. The operation characteristics of the coordination timer TLR are as shown in FIG. The horizontal axis of the figure represents the elapsed time since the switch SW was closed, and the vertical axis represents the TLR operation time limit. The closing of the switch SW is detected by the closing of the auxiliary contact 15.

As shown in the drawing, the cooperative timer TLR is closed after T ₁₀ hours of the switch SW is a momentary operation, when the operation signal of the accident detection relay DG or OC is input during this period, immediately opening command Is output. The T ₁₀ hours has a corresponding value in the progressive timed. On the other hand, after T ₁₀ hours, an initial time period and T _11, until the elapsed time T ₂₀ has a time characteristics that increases in proportion to the time. In addition,
The reclosing control means 21 has the same configuration as that shown in FIG.

Assuming that the switch SW having the protection relay device configured as described above is applied to the distribution system shown in FIG.
Next, the operation will be described.

In progressive Division electrostatic operation such reclosing, firstly, to closing a switch CB is distribution leg L ₁ is charged. Thus, known reclosing means not shown are provided to the control unit CONT of the switch SW ₁ '(Progressive Division electrostatic operating means) is operated, T
After the forward time set at the same time as ₁₀ hours, the switch
SW ₁ is closed. That will be the distribution leg L ₂ Madeka conductive after closing the CB to ₁₀ hours after T. Similarly, when the switch SW ₂ is closed after ₁₀ hours from T, the switch CB is closed and then
Are voltage application to the distribution leg L ₃ to T ₁₀ × 2 hours. Where F
When an accident occurs at the point, the accident detection relay operates, operates instantaneously cooperative timer TLR ₂ of the switch SW ₂ is based on the characteristics of FIG. 10, the fault section separated by open the SW ₂ It is. Cooperative timer T of the switch SW ₁ at this time
Settling time LR _1, since has become the 10 ₁₁ hours or more proportional zone T of Figure, switch SW ₁ is not open, a power failure can be prevented. If a coordination timer having the characteristics shown in FIG. 10 is applied to the switch CB, the settling time at the time of occurrence of the accident is 2 × T ₁₁
That is all.

Incidentally, in order to suppress the power failure at the time of the accident in the progressive Division electrodeposition as described above only one distribution leg L _3, the settling time initial value T ₁₁
Must satisfy equation (1). In this case, the reclosing control means 21 is unnecessary as described with reference to FIG. On the other hand, if you set the initial value T ₁₁ to satisfy equation (2), re-closure control means 21 of the cutoff measures chasing is required.

Thus, it becomes possible to shorten the progressive timed T _10, for example, about 1 second. That is, in the distribution system of FIG. 1, when the switches SW ₁ , SW ₂ , SW ₃ , and SW ₄ are sequentially closed at intervals of 1 second, for example, 5 seconds at the point F of the section L ₃ to which power is applied after 2 seconds. Later, an accident occurs. in this case,
Settling time coordination timer is, since T _2> T _1> is always maintained a relationship of FT, accidents are removed only always by switch SW _2.

For this point, the so was determined fault section 4 of the switch after 4 seconds As you closed at one second intervals are closed by the time after the CB closure according example the conventional method, SW ₃ onward There is a risk of accidentally determining an accident in the section of Therefore, in the past, the time limit for the forward transfer was set to about 10 seconds.

Therefore, in the present embodiment, as shown in FIG. 10, the settling time of the coordination timer TLR during the progressive power transmission is increased in proportion to the elapsed time after the circuit is closed, and the equation (1) or upon reaching T ₂₁ hours timed relationship steady state shown in (2), in which so as to stop the increase.

Here, time T ₂₁ come determined by progressive timed and time until an accident occurs after closed one of the switches. For example, 110 seconds coordinated time difference from Equation (1), one second progressive timed, the higher the possibility that an accident occurs in up to 5 seconds after closing one of the switches, T ₂₁ is 110 msec × 5 = 55
It is 0 msec.

Incidentally, as in the above embodiment shown in FIG. 10, it is T ₁₀ hours to switch the following section is closed but the instantaneous operation, in proportion to the time as indicated by a dotted line in the figure increases The same effect can be achieved by doing so.

Also, an example in which power is sequentially applied from the outlet switch CB has been described, but the present invention can be applied to the case of reverse feeding from an adjacent section or the like. That is, the interval L ₄ from the switch SW ₈ in Figure 1
If applied to the case of backhaul to, made to re-voltage application is short to section L ₄ beyond the healthy section, the effect of reducing the power failure time is greater.

Further, the protection relay device of each embodiment described above is not provided in all switches of the distribution system, but the distribution system is divided into large groups (groups) in an appropriate number of sections, and the switches arranged at the group connection points are arranged. It may be provided only. According to this, the number of power outages and the like can be reduced for each group section. In this case, the other switches may have the conventional functions.

If a switch having a short-circuit current breaking ability is used for the switch, the above-described short-circuit protection and ground fault protection functions can be formed. On the other hand, when a switch having no short-circuit breaking capability is used, a ground fault protection function can be provided. Of course, these may be appropriately combined to constitute a distribution line protection relay device.

FIG. 11 shows an embodiment in which the number of power failures is reduced by grouping and providing protection relay devices. In the figure, CB ₁ , CB
Reference numeral ₂ denotes an outlet switch similar to the embodiment shown in FIG. DM ₁₁ , DM
₁₂ , DM ₁₃ and DM ₁₄ are switches without an accident detection function. PCB ₁ , PCB ₂ , PCB ₃ have short-circuit current breaking capability,
It is a switch provided with a protection relay device including short circuit accident protection. _{SW 11, SW 12, SW 13} , SW 14 is a switch provided with the protective relay device having a short-circuit protection only.

In the figure, distribution line 31 is the distribution line
32 and adjacent to each other. An example is shown in which one PCB is arranged for every two DMs. However, this can be any number, in other words, a PCB capable of shutting off immediately in the event of an accident.
Are provided at the connection points of the section groups, so that the power failure in each section group can be completed only once.

FIG. 12 shows a time chart of the operation states of the switches installed on the distribution line 31 when an accident occurs in the section 15.

First, as soon as an accident occurs in section 15, CB ₁ is released. Then delayed slightly (approximately 0.5 to 1 second), the switches (PCB ₁ ~DM ₁₁ ~DM ₁₃₎ is opened.

Here, the reason why the PCB ₁ is opened with a time limit in the same manner as DM _{11 to} DM ₁₃ is to prevent the PCB _{1 from} being opened at the moment of a power failure of the system power supply.

When CB ₁ recloses after a predetermined time, section 11 is charged and X ₁₁
DM ₁₁ will be released after the time limit.

Hereinafter, when the sections are sequentially charged and the section 15 is charged, an accident point is included, so that the PCB ₁ is immediately opened by the PCB ₁ accident detection relay. This locks the next timed sequential feeding operation.

Similarly to the conventional method, the DM ₁₃ is immediately shut down during the X time period after the power is applied, so that the time-sequential feeding operation is locked.

Therefore, if the PCB ₁ is reclosed after the predetermined time period, the power is immediately supplied to the section 14 just before the accident section 15 without the DM _{13 being} turned on after the X ₁₃ time period due to the section 14 power supply.

That is, the power outage can be minimized for each section group divided by the PCB.

If there is no accident section in own section group, the power is restored by only one power outage. However, if there is an accident section in own section group, two power outages occur. However, the power outage time is shorter than in the conventional method.

As is clear from the above description, the setting of the time limit _TF for determining whether to shut off immediately upon detection of a PCB accident is as follows:
The power supply is completed for all the section groups and the connection point with the next section
It must be done until the PCB is loaded.

After up section 14 as described above is that is voltage application in a short time, interval 16 is voltage application by introduction of timed after PCB ₂ of Z Timer Z ₂ of PCB _2. X ₁₄ timer after the operation DM14 without being turned for the closing lock, the power transmission from safely adjacent sections power completed. Next, FIG. 11 shows a case where the distribution line 32 includes a SW having a relay having only a ground fault detection function and not detecting a short circuit fault in a section group divided by PCB. The operation time chart in this case is shown in FIG.

Now, if a ground fault occurs in section 25, as in the case of FIG. 13, all switches are opened, CB ₂ is reclosed after a predetermined time period, and power is sequentially applied to sections 21 to 25. .

When section 25 is charged, SW ₁₃ detects ground fault and
It is released immediately. In the case of a short circuit accident in section 25,
As with the distribution line 31 shown in FIG. 12, the PCB ₃ is opened.

In this way, after the accident section is separated, the control device of each switch detects the presence of one-sided voltage and sequentially closes again,
Each healthy section is restored.

With such a configuration of the distribution line 32, in the event of a ground fault, as in the case of using all the DMs as PCBs, two conventional power outages are required only once, and in the case of a short circuit accident, the case of the distribution line 31 Similarly to the above, the number of power outages is one or two for each section group.

〔The invention's effect〕

As described above, according to the present invention, since the settling time of the coordination timer provided in each switch is set to be shorter as the distance from the power supply of the distribution line becomes shorter, the coordination time difference is provided. The switch is activated immediately to disconnect the accident zone, and the switch on the power supply end side is not activated due to the cooperative time difference. Thereby, a power failure in a healthy section is avoided or substantially equal to zero. Further, since processing can be performed only by the cooperative time difference, equipment such as a pilot wire is not required.

Further, as a result of the above, since the separation of the accident section is performed in a short time, the forward or reverse power transmission beyond the accident section can be quickly performed, and the power outage time can be shortened as a whole.

According to the configuration in which the settling time of the coordination timer is increased in accordance with the elapsed time for a predetermined time after the switch is closed, when sequentially applying power to the distribution line including the accident point, Even in the case of an accident state in which it takes time until the occurrence of an accident after power application (for example, a ground fault accident), the forward time interval can be made sufficiently short to shorten the power outage time.

[Brief description of the drawings]

1 is an overall configuration diagram of a distribution line device according to one embodiment to which the present invention is applied, FIG. 2 is a timing chart for explaining the operation of the embodiment of FIG. 1, and FIG. 3 is the operation of another embodiment. FIG. 4 is a block diagram of the switch and the protection relay device according to the embodiment described in FIG. 3, FIG. 5 is a detailed block diagram of a main part of FIG. 4, and FIG. FIG. 4 is a timing chart for explaining the operation of the embodiment, and FIG.
The figure is a block diagram of a main part of a protection relay device of another embodiment, FIG. 8 is a block diagram of a switch and a protection relay device around another embodiment, and FIG. 9 is a main part of the embodiment of FIG. FIG. 10 is a detailed block diagram, FIG. 10 is an operation characteristic diagram of the coordinating timer of FIG. 8, and FIG. 11 is a diagram showing an example of setting of the settling time of one embodiment relating to the progressive power application. 12 is an overall configuration diagram of a distribution line device according to another embodiment to which the present invention is applied, and FIGS. 12 and 13 are timing charts for explaining the operation of the embodiment of FIG. L ₁ ~L ₆ ...... distribution leg, CB ...... outlets switch, SW, SW ₁ ~SW ₇ ...... switches, DM ...... switches, FRY, RY ₁ ~RY ₄ ...... accident detection relay, FTL , TL, TL _{1 to} TL ₄ , TLR ... Coordination timer, CONT ... Control device, DG ... Ground fault relay, OC ... Overcurrent relay, 3,4 ... Distribution line, 16 ... Computing unit , 20... Reclosing timer, 21... Reclosing control means.

Claims (8)

(57) [Claims] A switch distributed in a distribution line is provided with an accident detection relay in a distribution section divided by the switch, and the switch is connected to the switch after a predetermined settling time after the operation of the accident detection relay. A coordination timer that outputs an open command is provided, and a coordination time difference that is a difference between a settling time of the coordination timer related to one switch and a settling time of the coordination timer related to the other switch is determined by the switch. A distribution line protection relay device variably set in proportion to the magnitude of the line voltage of the distribution line at the installation point. 2. After the switch is opened, it is determined whether or not there is a voltage on a distribution line on the power supply end side of the switch. If the determination is made, a re-closing command is issued to the switch after a predetermined time. 2. The distribution line protection relay device according to claim 1, further comprising a re-closing control means for outputting and re-closing the switch when the fault detection relay operates again due to a short-circuit fault after the re-closing by the command. 3. A switch which is distributed and arranged on a distribution line and which is operated to apply a progressive power transmission is provided with an accident detection relay in a distribution section divided by the switch, and a predetermined switch is provided after the operation of the accident detection relay. A coordination timer for outputting an opening command to the switch after the settling time is provided, and the settling time T (n) of the coordinating timer is changed from zero to an elapsed time for a fixed time after the switch is closed. The settling time T (n) that is proportionally increased and after the lapse of the fixed time is ΔT longer than the settling time T (n + 1) of the coordination timer of the switch on the side opposite to the power supply end from the switch. (N) a long time and the ΔT
(N) is the recovery time of the accident detection relay of the switch.
_R (n), and when the open response time of one switch on the side opposite to the power supply end from the switch is ts (n + 1), the relationship of ΔT (n)> ts (n + 1) + t _R (n) is satisfied. Distribution line protection relay device that is set to a value that does. 4. A switch which is distributed and arranged on a distribution line and which is subjected to a progressive power transmission operation is provided with an accident detection relay in a distribution section divided by the switch, and a predetermined switch is provided after the operation of the accident detection relay. A coordination timer for outputting an opening command to the switch after the settling time is provided, and the settling time T (n) of the coordination timer is instantaneously set for a first fixed time after the switch is closed. Settled, after the elapse of the predetermined time, during the second predetermined time, the value is increased in proportion to the elapsed time from the preset initial value, and after the elapse of the second predetermined time after the switch is closed. The settling time T (n) is longer by ΔT (n) than the settling time T (n + 1) of the coordinating timer of the switch on the side opposite to the power supply end from the switch by ΔT (n).
(N) is the recovery time of the accident detection relay of the switch.
_R (n), and when the open response time of one switch on the side opposite to the power supply end from the switch is ts (n + 1), the relationship of ΔT (n)> ts (n + 1) + t _R (n) is satisfied. Distribution line protection relay device that is set to a value that does. 5. A switch which is distributed in a distribution line and operated to apply a progressive power transmission is provided with an accident detection relay in a distribution section divided by the switch, and a predetermined switch is provided after the operation of the accident detection relay. A coordination timer that outputs an opening command to the switch after the settling time is provided, and the settling time T (n) of the coordination timer is increased in proportion to the elapsed time from zero after the switch is closed. And the settling time T (n) after a lapse of a fixed time is ΔT (n) longer than the settling time T (n + 1) of the coordination timer of the switch on the side opposite to the power supply end from the switch. And ΔT (n) is the return time of the fault detection relay of the switch as t _R (n), the open response time of the switch as ts (n), and one of the switches located on the opposite side of the power supply end from the switch. When the open response time of the switch is ts (n + 1), ts (n + 1) _{+ T R (n)> ΔT} (n)> ts (n + 1) -ts (n) + t R (n) become set to a value that satisfies the distribution line protective relay device. 6. A switch which is distributed in a distribution line and operated in a forward transmission mode is provided with an accident detection relay in a distribution section divided by the switch, and a predetermined switch is provided after the operation of the accident detection relay. A coordination timer that outputs an opening command to the switch after the settling time is provided, and the settling time of the coordinating timer is settled instantaneously for a first fixed time after the switch is closed, and After a lapse of a certain time, the settling time T is increased from a preset initial value in proportion to the lapse time, and the settling time T after a second certain time after the switch is closed.
(N) is ΔT (n) longer than the settling time T (n + 1) of the coordination timer of the switch one power supply end side of the switch, and ΔT (n) is an accident of the switch. The return time of the detection relay is t _R (n), the open response time of the switch is ts (n), and the open response time of one switch on the side opposite to the power supply from the switch is ts (n + 1). Ts (n + 1) + t _R (n)> ΔT (n)> ts (n + 1) −
A distribution line protection relay device set to a value satisfying ts (n) + t _R (n). 7. A judgment is made as to whether or not the accident detection relay has returned before the switch is opened, and if the judgment is affirmative, a re-close command is output to the switch after a third fixed time. Claim 3, 4, characterized in that it is provided with reclosing control means
The distribution line protection relay device according to any one of claims 5 and 6. 8. The switches distributed on the distribution line are divided into at least two or more groups, and the switches disposed at the connection points between the grooves are provided with the switches. A distribution line device provided with the distribution line protection relay device according to any one of claims 6 and 7.