CN213717614U - Station-used grounding transformer protection device capable of selectively tripping and transformer system - Google Patents
Station-used grounding transformer protection device capable of selectively tripping and transformer system Download PDFInfo
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- CN213717614U CN213717614U CN202021770261.9U CN202021770261U CN213717614U CN 213717614 U CN213717614 U CN 213717614U CN 202021770261 U CN202021770261 U CN 202021770261U CN 213717614 U CN213717614 U CN 213717614U
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Abstract
The utility model belongs to the field of relay protection and safety of power systems, and discloses a station-used grounding transformer protection device and a transformer system with selective tripping, which are provided with a signal acquisition device, wherein the output end of the signal acquisition device is connected with a plurality of groups of output switch quantity contacts; the main board is arranged in the signal acquisition device; the first output switching value contact is electrically connected with the under-excited tripping contact of the low-voltage cabinet circuit breaker of the station system; the second output switching value contact is connected with the main transformer protection device; and the input current loop is connected with a secondary winding of a neutral point zero-sequence current transformer of the grounding transformer. The low-voltage fault can be selectively removed firstly, and the main transformer can be effectively prevented from being removed by mistake when the low-voltage system is in short circuit. Meanwhile, the design of the device enables a wiring mode that the T is connected to a lead on the low-voltage side of the main transformer to be possible, and compared with a mode that a transformer for a station and a grounding transformer are independently arranged or a mode that the T is connected to a low-voltage bus through a circuit breaker.
Description
Technical Field
The utility model belongs to power system relay protection and safety field especially relate to a station of selectivity tripping operation is with holding concurrently grounding transformer protection device, transformer system.
Background
At present, one connection mode of the station double-grounding transformer is T-connection on a low-voltage side lead wire of a main transformer. When a system for a low-voltage station has a ground fault, the conventional protection device is configured according to 1 section 1 time limit, and a main transformer is directly cut off during the fault, so that the power failure range is expanded. The conventional protection device cannot meet the design requirements of the station double-grounding transformer scheme.
In summary, the problems of the prior art are as follows: conventional station cum earth transformer protection devices will typically act to cause the main transformer to trip and the total station to lose power.
The difficulty in solving the technical problems is as follows: the station is connected with a small resistor through a high-voltage side neutral point of the double-grounding transformer, and is provided with a low-voltage side load outgoing line, and when the low-voltage outgoing line is in ground fault, the high-voltage side neutral point passes through short-circuit current, so that protection action adjustment is started. Therefore, it is necessary to design a protection device and a connection method thereof to selectively remove low-voltage faults and prevent the main transformer from tripping to enlarge the power failure range.
The significance of solving the technical problems is as follows: the station-used and grounding transformer protection device selectively removes low-voltage faults, reduces the power failure range and improves the power supply reliability.
Disclosure of Invention
Problem to prior art existence, the utility model provides a station of selectivity tripping operation is with holding concurrently ground transformer protection device.
The utility model is realized in such a way that the protection device of the station-used grounding transformer with selective tripping is provided with a signal acquisition device, and the signal acquisition device is connected with an analog quantity which is a high-voltage side zero-sequence current;
a device panel;
the device is internally provided with a mainboard, a zero sequence current acquisition board, a CPU board, a power supply board and a switch board are arranged on the reverse side of a panel of the device, each plugboard is an independent functional module and is in plug-in connection with the mainboard through a slot prefabricated on the mainboard, and communication interconnection is realized through a mainboard built-in circuit.
And the input current loop is connected with a secondary winding of a zero sequence current transformer of a neutral point of the grounding transformer, realizes the acquisition of zero sequence current and is used for judging the occurrence of system grounding faults.
The first output switching value contact corresponds to a 1 time limit action outlet of the protection device and is electrically connected with the underexcitation tripping contact of the low-voltage circuit breaker of the station system;
the second output switching value contact corresponds to the 2-time-limit action outlet of the protection device and the main transformer protection device.
When the device detects that the zero sequence current collected by the current collecting plate is greater than the setting value, the 1 time limit and the 2 time limit act according to the set sequence to independently exit. The underexcitation tripping contact of the system low-voltage cabinet circuit breaker for the first group of junction stations is used for cutting off system faults for the low-voltage station at the 1 st time limit; the second group is connected with a main transformer protection device and is used for cutting off the main transformer in the 2 nd time limit. When the zero-sequence current after the 1 time limit action is less than 90% of the setting value, the protection action returns, the 2 time limit does not act any more, the selective tripping of the protection is realized, the fault power failure range is reduced, and the feasibility of the scheme that the station double-grounding transformer T is connected with the low-voltage side lead of the main transformer is ensured.
Another object of the present invention is to provide a transformer system with the station-compatible grounding transformer protection device installed with the selective trip.
In summary, the advantages and positive effects of the invention are: the station-used and grounding transformer protection device capable of tripping selectively can remove low-voltage faults selectively and effectively prevent a main transformer from being removed by mistake when a low-voltage system is in short circuit. Meanwhile, the T connection mode on the lead at the low-voltage side of the main transformer is possible by the design of the device, and compared with a mode that a transformer for a station and a grounding transformer are independently arranged or a mode that a breaker is connected on a low-voltage bus, the wiring mode saves electrical equipment such as the transformer or the breaker and reduces the investment of a power station.
Drawings
Fig. 1 is a schematic circuit diagram of a station double-acting grounding transformer protection device for selective tripping according to an embodiment of the present invention.
Fig. 2 is a device panel diagram of a station double-acting grounding transformer protection device for selective tripping according to an embodiment of the present invention.
In the figure: (a) front structure diagram of the device panel; (b) the back structure of the device panel;
in the figure: 1. an indicator light; 2. a zero sequence current collecting plate; 3. a CPU board; 4. a power panel; 5. and (5) opening the plate.
Fig. 3 is an input/output circuit diagram of a station double-acting grounding transformer protection device for selective tripping according to an embodiment of the present invention.
In the figure: 6. a main board; 7. a neutral point zero sequence current transformer of the grounding transformer; 8. device 1 time-limited trip outlet contacts; 9. device 2 time-limited trip outlet contacts; 10. the station-used low-voltage main switch shunt tripping contact; 11. the main transformer protects the full trip contacts.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings.
In order to solve the problem that the power failure range is expanded because the station-used grounding transformer protection device cannot selectively remove faults, the selectively tripped station-used grounding transformer protection device is connected with a zero-sequence current acquisition board 2 with an analog quantity of a high-voltage side, and the front surface of the protection device is provided with an indicator lamp 1; the device panel reverse side is installed zero sequence current and is gathered board 2, CPU board 3, power strip 4, division board 5, and zero sequence current gathers board 2, CPU board 3, power strip 4, division board 5 and is independent functional module respectively, through prefabricated slot and mainboard 6 grafting connection on the mainboard 6 to realize the communication interconnection through the mainboard 6 built-in circuit.
Two groups of independently controlled switching value contacts are output, and the two groups of independently controlled switching value contacts are respectively as follows: the device 1 time limit tripping outlet contact 8 and the device 2 time limit tripping outlet contact 9, and the first group of low-voltage cabinet circuit breaker substation shortage low-voltage main switch shunt tripping contact 10 for cutting off system faults for the low-voltage station at the 1 st time limit; the second group is connected with a main transformer protection device and is used for cutting off the main transformer in the 2 nd time limit. When the zero-sequence current after the 1 time limit action is less than 90% of the setting value, the protection action returns, the 2 time limit does not act any more, the selective tripping of the protection is realized, the fault power failure range is reduced, and the feasibility of the scheme that the station double-grounding transformer T is connected with the low-voltage side lead of the main transformer is ensured.
Another object of the present invention is to provide a transformer system with a dual-purpose grounding transformer protection device for a station, which is installed with a main transformer protection total trip contact 11.
When the system for the low-voltage station is in a ground short-circuit fault, the station-used dual-purpose grounding transformer neutral point is grounded through a small resistor, the neutral point flows through the zero-sequence current acquisition board 2, and the fault judgment program is started when the zero-sequence current transformer 7 of the neutral point of the grounding transformer detects that the zero-sequence current is larger than a starting value.
When the input analog quantity is greater than the current setting value and the duration time reaches 1 time limit time setting value, starting a first output switching value contact, starting tripping and tripping the low-voltage circuit breaker through a substation-lack low-voltage main switch shunt tripping contact 10 of a substation system low-voltage cabinet circuit breaker, and isolating a low-voltage side fault point. And (1) after time limit tripping, if the analog quantity is less than the current setting return value, returning the protection.
And if the analog quantity is still greater than the setting value after the 1 time limit action and the total duration time reaches the 2 time limit time setting value, starting a second output switching value contact, and tripping the circuit breakers on all sides of the main transformer by starting the main transformer protection device to completely isolate fault points.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all the modifications and equivalents of the technical spirit of the present invention to any simple modifications of the above embodiments are within the scope of the technical solution of the present invention.
Claims (6)
1. A station-used and grounding transformer protection device capable of selectively tripping is characterized in that a signal acquisition device is arranged, and the output end of the signal acquisition device is connected with a plurality of groups of output switch quantity contacts;
the main board is arranged inside the signal acquisition device;
the first output switching value contact is electrically connected with the under-excited tripping contact of the low-voltage cabinet circuit breaker of the station system;
the second output switching value contact is connected with the main transformer protection device;
and the input current loop is connected with a secondary winding of the neutral point zero-sequence current transformer of the grounding transformer.
2. The selectively tripped station cum earth transformer protection device of claim 1 wherein the signal acquisition device is connected to a high side zero sequence current device.
3. The selectively tripped station cum earth transformer protection device as claimed in claim 1, wherein the back of the main board is installed with a zero sequence current collection board, a CPU board, a power supply board, and an outlet board through slots.
4. The selectively tripped station cum earth transformer protection device of claim 1 wherein the first output switching value contact is connected to the 1 time limit action outlet of the protection device.
5. The selectively tripped station cum earth transformer protection device of claim 1 wherein the second output switching value contact is connected to the 2 time limit action outlet of the protection device.
6. A transformer system equipped with the station cum earth transformer protection device for selective tripping according to any of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021770261.9U CN213717614U (en) | 2020-08-21 | 2020-08-21 | Station-used grounding transformer protection device capable of selectively tripping and transformer system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021770261.9U CN213717614U (en) | 2020-08-21 | 2020-08-21 | Station-used grounding transformer protection device capable of selectively tripping and transformer system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213717614U true CN213717614U (en) | 2021-07-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021770261.9U Active CN213717614U (en) | 2020-08-21 | 2020-08-21 | Station-used grounding transformer protection device capable of selectively tripping and transformer system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213717614U (en) |
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2020
- 2020-08-21 CN CN202021770261.9U patent/CN213717614U/en active Active
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