CN211930260U - Direct current supply device of box transformer substation protection device - Google Patents
Direct current supply device of box transformer substation protection device Download PDFInfo
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- CN211930260U CN211930260U CN202020507261.3U CN202020507261U CN211930260U CN 211930260 U CN211930260 U CN 211930260U CN 202020507261 U CN202020507261 U CN 202020507261U CN 211930260 U CN211930260 U CN 211930260U
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Abstract
The utility model discloses a case becomes protection device's direct current and provides device, wherein the case becomes and has direct current output and rectifier module, the direct current provides the device and includes: a direct current power supply; the switching device is arranged between the rectification module and the direct current output end and used for switching on the direct current power supply and the direct current output end when the rectification module can not provide the direct current power supply; and the box transformer substation protection device is connected with the direct current output end. The utility model provides a case becomes protection device's direct current and provides the device, can continue to provide the direct current to protection device when former station becomes the trouble, make protection device correct action to cut off the trouble.
Description
Technical Field
The utility model relates to a direct current provides the device, especially provides the device about a case becomes protection device's direct current.
Background
At present, a coal conveying system of a power plant directly conveys coal mined by an open pit coal mine to the power plant through a long-distance coal conveying belt for power generation. A box-type substation in a coal conveying system of a power plant is an indispensable device. A box-type substation, also called a pre-installed substation or a pre-installed substation, is widely used in a power distribution network. The three-phase alternating current power supply is suitable for a three-phase alternating current system with rated voltage of 10/0.4KV, and is used for lines and distributing electric energy. In a box-type substation, a protection device is often added to ensure the stability of the system, the box-type substation protection device can be used for various protections such as transformer differential protection, high-voltage side circuit breaker overcurrent protection, low-voltage side incoming line circuit breaker overcurrent protection, low-voltage side load low-voltage protection and the like, and control loops of high-voltage and low-voltage side circuit breakers, and the power supply of the box-type substation protection device is taken from the direct current of the box-type substation.
Specifically, fig. 1 is a schematic structural diagram of a dc power supply in the prior art, and as shown in fig. 1, a power supply of the box-type substation protection device is taken from a box-type substation, the station-type substation steps down a voltage of 6kv output by a main transformer to 380V, and a rectifier module in the box-type substation provides the dc power supply of the box-type substation protection device. The DC power supply supplies DC energy to each switching operation and each protection of the box transformer substation, so that each protection device can correctly judge the fault type and cut off the fault.
Based on this, the inventor of the present application found that there is a disadvantage in the power supply method of the box-type substation protection device, and the dc power supply may be reduced when the box-type substation fails, which may cause the protection device not to operate correctly on the circuit breaker. The circuit breakers which are supposed to be operated to be separated cannot be separated correctly, so that the fault point is enlarged, equipment cannot be protected correctly, and the problems that the equipment trips in a grade-exceeding mode, the faults are enlarged and the like are caused.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a case becomes protection device's direct current and provides the device, it can provide the direct current to protection device, makes protection device correct action to cut off the trouble.
In order to achieve the above object, the utility model provides a case becomes protection device's direct current and provides device, wherein the case becomes and has direct current output and rectifier module, the direct current provides the device and includes: a direct current power supply; the switching device is arranged between the rectification module and the direct current output end and used for switching on the direct current power supply and the direct current output end when the rectification module can not provide the direct current power supply; and the box transformer substation protection device is connected with the direct current output end.
In a preferred embodiment, the switching device comprises two sets of diodes; the first group of diodes is arranged between the direct current power supply and the direct current output end; one end of the second group of diodes is connected with the first group of diodes, and the other end of the second group of diodes is connected with the output end of the rectifying module.
In a preferred embodiment, the first group of diodes includes a first diode and a second diode, and the second group of diodes includes a third diode and a fourth diode; the positive pole of the first diode is connected with the positive current output end of the direct current power supply, the negative pole of the first diode is connected with the negative pole of the third diode, and the negative pole of the first diode is connected with the positive pole of the direct current output end through the first switch; the positive electrode of the third diode is connected with the positive current output end of the rectifying module through a third switch; the negative pole of the second diode is connected with the negative current output end of the direct current power supply, the positive pole of the second diode is connected with the positive pole of the fourth diode, and the positive pole of the second diode is connected with the negative pole of the direct current output end through the second switch; and the negative electrode of the fourth diode is connected with the negative current output end of the rectifying module through a fourth switch.
In a preferred embodiment, the DC power supply is a DC-UPS.
In a preferred embodiment, the first switch is connected to the positive pole of the dc output via a fuse resistor.
In a preferred embodiment, the second switch is connected to the negative pole of the dc output via a fuse resistor.
In a preferred embodiment, the third switch is connected to the positive current output of the rectifier module via a fuse resistor.
In a preferred embodiment, the fourth switch is connected via a negative current output of the rectifier module.
Compared with the prior art, according to the utility model discloses a case becomes protection device's direct current and provides the device, through on current case becomes control power supply system's basis, increases one set of direct current and provides the device, can continue to provide the direct current to protection device when former station becomes the fault, makes protection device corrective action to cut off the trouble. The occupied space is small, and the box type transformer can move integrally.
Drawings
Fig. 1 is a schematic diagram of a structure of a dc power supply in the prior art.
Fig. 2 is a schematic view of an access method of a dc providing device according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a direct current supply device according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a dc supply device according to another embodiment of the present invention.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited by the following detailed description.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
At present, a box transformer substation is provided with a rectifier module, and the output end of the rectifier module is the direct current output end of the box transformer substation. And the box transformer substation protection device is connected with the direct current output end of the box transformer substation.
As shown in fig. 2, which is a schematic view of an access mode of the dc providing apparatus according to the preferred embodiment of the present invention, as shown in fig. 3, which is a schematic view of a structure of the dc providing apparatus according to a preferred embodiment of the present invention, the box transformer has a dc output end 22 and a rectifying module 21. The dc supply device 1 in the present embodiment includes: a switching device 11 and a dc power supply 12 connected to the switching device 11. The switching device 11 is disposed between the rectifier module 21 and the dc output terminal 22 of the box-type substation, and is configured to switch on the dc power supply 12 and the dc output terminal 22 of the box-type substation when the rectifier module 21 cannot provide a dc power supply.
The direct current power supply can be a direct current uninterruptible power supply (DC-UPS).
Further, the switching device comprises two groups of diodes. The first group of diodes are arranged between the direct current power supply 12 and the direct current output end 22 of the box transformer substation, one end of the second group of diodes is connected with the first group of diodes, and the other end of the second group of diodes is connected with the output end of the rectifying module 21.
In this embodiment, two sets of single-phase conduction diodes are added, so that when the normal operating condition is realized, the DC power supply supplied by the rectifier module supplied by the original station transformer still supplies the DC bus, and because the current and the voltage of the original input DC power supply are slightly higher than those of the DC-UPS side, the DC-UPS side does not transmit current to the power utilization side when the normal operating condition is realized. The rectifier module supplied by the original station transformer can not rectify (the station transformer loses power due to faults and other reasons), at the moment, because the current and the voltage of the original input direct current side are reduced or disappeared, the current and the voltage of the DC-UPS side are higher than those of the power utilization side, the diode is conducted, the direct current power supply is supplied to the power utilization side from the DC-UPS side, and the protection devices and the switch can normally operate until the protection devices and the switch correctly operate within a period of time.
Therefore, in the present embodiment, a set of dc supply device is added to the existing box-type substation control power supply system, so that dc power can be continuously supplied to the protection device when the original station fails, the protection device can be operated correctly, and the failure can be cut off. The occupied space is small, and the box type transformer can move integrally.
In one embodiment, as shown in fig. 4, it is a schematic structural diagram of a dc providing apparatus according to another preferred embodiment of the present invention. The first group of diodes includes a first diode 111 and a second diode 112, and the second group of diodes includes a third diode 113 and a fourth diode 114.
The anode of the first diode 111 is connected to the positive current output terminal of the dc power supply 12, the cathode of the first diode 111 is connected to the cathode of the third diode 113, and the cathode of the first diode 111 is connected to the anode of the dc output terminal 22 of the box transformer through the first switch 115.
The anode of the third diode 113 is connected to the positive current output of the rectifier module 21 via a third switch 117.
The cathode of the second diode 112 is connected to the negative current output terminal of the dc power supply 12, the anode of the second diode 112 is connected to the anode of the fourth diode 114, and the anode of the second diode 112 is connected to the cathode of the dc output terminal 22 of the box-type substation through the second switch 116.
The cathode of the fourth diode 114 is connected to the negative current output of the rectifier module 21 via a fourth switch 118.
In one embodiment, the first switch is connected to the positive pole of the dc output of the box transformer via a fuse resistor. And the second switch is connected with the negative electrode of the direct current output end of the box transformer substation through a fusing resistor. And the third switch is connected with the positive current output end of the rectifying module through a fusing resistor. And the fourth switch is connected with the negative current output end of the rectifying module.
From this, the direct current that this embodiment provided provides the device, the operation personnel inspection of being convenient for of interface easy operation need not personnel and operates and reach the supporting role automatically, and the former direct current electrical power generating system of make full use of saves material resources financial resources promptly and uses manpower sparingly again. The stability and the reliability of the operation of the box transformer substation are improved, the safe and stable operation of a unit fuel supply system is further improved, and the large problems are solved with small investment.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (8)
1. A direct current provides device of case transformer substation protection device, wherein case transformer substation has direct current output and rectifier module, its characterized in that, direct current provides the device and includes:
a direct current power supply; and
the switching device is arranged between the rectifying module and the direct current output end and used for switching on the direct current power supply and the direct current output end when the rectifying module cannot provide the direct current power supply;
and the box transformer substation protection device is connected with the direct current output end.
2. The direct current providing apparatus according to claim 1, wherein said switching means comprises two sets of diodes;
the first group of diodes is arranged between the direct current power supply and the direct current output end;
one end of the second group of diodes is connected with the first group of diodes, and the other end of the second group of diodes is connected with the output end of the rectifying module.
3. The dc providing apparatus of claim 2, wherein the first set of diodes comprises a first diode and a second diode, and the second set of diodes comprises a third diode and a fourth diode;
the positive pole of the first diode is connected with the positive current output end of the direct current power supply, the negative pole of the first diode is connected with the negative pole of the third diode, and the negative pole of the first diode is connected with the positive pole of the direct current output end through the first switch;
the positive electrode of the third diode is connected with the positive current output end of the rectifying module through a third switch;
the negative pole of the second diode is connected with the negative current output end of the direct current power supply, the positive pole of the second diode is connected with the positive pole of the fourth diode, and the positive pole of the second diode is connected with the negative pole of the direct current output end through the second switch;
and the negative electrode of the fourth diode is connected with the negative current output end of the rectifying module through a fourth switch.
4. The direct current supply apparatus according to claim 1,
the direct current power supply is a DC-UPS.
5. The dc providing apparatus of claim 3 wherein said first switch is connected to the positive terminal of said dc output terminal through a fuse resistor.
6. The dc providing apparatus of claim 3 wherein said second switch is connected to the negative terminal of said dc output terminal through a fuse resistor.
7. A dc providing device according to claim 3 wherein the third switch is connected to the positive current output of the rectifying module by a fuse resistor.
8. A direct current providing apparatus according to claim 3 wherein the fourth switch is connected through the negative current output of the rectifier module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020507261.3U CN211930260U (en) | 2020-04-09 | 2020-04-09 | Direct current supply device of box transformer substation protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020507261.3U CN211930260U (en) | 2020-04-09 | 2020-04-09 | Direct current supply device of box transformer substation protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211930260U true CN211930260U (en) | 2020-11-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020507261.3U Active CN211930260U (en) | 2020-04-09 | 2020-04-09 | Direct current supply device of box transformer substation protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211930260U (en) |
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2020
- 2020-04-09 CN CN202020507261.3U patent/CN211930260U/en active Active
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