CN204190359U - A kind of transformer medium voltage side switching dead rapid protecting device - Google Patents
A kind of transformer medium voltage side switching dead rapid protecting device Download PDFInfo
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- CN204190359U CN204190359U CN201420571236.6U CN201420571236U CN204190359U CN 204190359 U CN204190359 U CN 204190359U CN 201420571236 U CN201420571236 U CN 201420571236U CN 204190359 U CN204190359 U CN 204190359U
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- 238000004804 winding Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Abstract
The utility model discloses a kind of transformer medium voltage side switching dead rapid protecting device, comprise logic distinguishing circuit and executive circuit, logic distinguishing circuit comprises medium voltage side current transformer, the secondary side zero-sequence current of medium voltage side current transformer gathers the signal input part of output connection zero-sequence current discrimination module, the secondary side overcurrent of medium voltage side current transformer gathers the signal input part of output connection overcurrent discrimination module, zero-sequence current discrimination module is all connected the signal input part of OR circuit with the signal output part of overcurrent discrimination module, the signal output part of OR circuit connects the first signal input part of AND circuit, the secondary signal input of AND circuit is connected on medium voltage side switch normally opened contact, described executive circuit comprises the time relay and main transformer three side switch, the signal output part connect hours relay coil of AND circuit, and three normally-closed contacts of the time relay are serially connected with on the switching circuit of main transformer three side respectively.
Description
Technical field
The utility model relates to resist technology field, transformer medium voltage side switching dead, particularly relates to one and is applied to 220KV transformer medium voltage side switching dead rapid protecting device.
Background technology
Transformer is one of electric equipment main in modern power systems.According to the structure of the power transformer of modern manufacturing, the operational reliability of transformer is very high, but the impact caused when transformer breaks down is very large, therefore should strengthen the function of its protective relaying device, to improve the safety operation level of electric power system.At present, in 220 kV tranformer protection configurations, can make transformer fault and irregular operating operating mode and judging accurately and correct operation.But during the fault that is short-circuited between main transformer medium voltage side switch summation current transformer, fault point, outside transformer differential protection scope, is referred to as failure in transformer dead zone again, and existing transformer can not carry out quick protection act; For such fault, transformer body can only excise fault by backup protection, but operate time is longer, is unfavorable for the safety of transformer.
The fault that transformer medium voltage side dead band exists has following two kinds:
One, transformer medium voltage side dead band single phase ground fault
As shown in Figure 1, when fault point k1 is single phase ground fault, room 110kV bus bar differential prptection operation disconnects all switches, i.e. room 110 switch and room 111 switch on room mother 110kVII, and now, fault point is not isolated completely.Reason is: because fault point k1 is within bus differential protection scope; 110kVII female bus differential protection in room starts; certain time-delay is disconnected each outlet switch of room 110kVII bus (comprising main transformer medium voltage side switch); main transformer high-pressure side continues to provide short circuit current to fault point k1; fault still exists; bus differential protection does not return, and meanwhile, medium voltage side backup protection startup does not return.So flow III segment protect 2 time limit action by medium voltage side zero, thus disconnect main transformer three side switch, now, fault point is completely isolated; When fault point k2 is single phase ground fault, room 110kVI bus bar differential prptection operation disconnects all switches, i.e. room 110 switch and room 112 switch on room 110kVI bus; now; fault point is not completely isolated, and disconnect main transformer three side switch by gap protection 1 time limit (0.5S), fault point is completely isolated.
Two, transformer medium voltage side dead band phase-to phase fault
As shown in Figure 1, when fault point k1 is phase-to phase fault, room 110kV bus bar differential prptection operation, disconnect all switches on room 110kVII bus, fault point is not completely isolated, then by medium voltage side resurgent III segment protect 2 time limit action tripping main transformer three side switch; When alternate earth fault occurs fault point k2, protection act situation is consistent with k1.
During 220kV transformer medium voltage side dead-zone fault, fault can only pass through medium voltage side backup protection action tripping main transformer three side switch, but the isolated fault point time is longer, high, medium voltage side winding can by very large short circuit current, transformer body is seriously generated heat, affect the life-span of insulating material, even make transformer damage; Long-time larger short circuit current makes the turn-to-turn insulation of winding cause damage, even causes winding deformation.Therefore be necessary that setting up 220kV transformer medium voltage side dead-zone fault protects fast, ensures the safety of transformer.
When medium voltage side switch disconnects, medium voltage side switch gap is not within 110kV bus differential protection scope, and female difference can not action, if now medium voltage side dead-zone fault, medium voltage side CT will detect fault current.
Utility model content
The purpose of this utility model is to provide a kind of transformer medium voltage side switching dead rapid protecting device, when transformer medium voltage side dead-zone fault, and can completely isolated fault point accurately and rapidly; simplify isolation flow process, improve reaction speed, simultaneously; reduce transformer damage rate, improve useful life.
The technical solution adopted in the utility model is:
A kind of transformer medium voltage side switching dead rapid protecting device, it is characterized in that: comprise logic distinguishing circuit and executive circuit, logic distinguishing circuit comprises medium voltage side current transformer, the secondary side zero-sequence current of medium voltage side current transformer gathers the signal input part of output connection zero-sequence current discrimination module, the secondary side overcurrent of medium voltage side current transformer gathers the signal input part of output connection overcurrent discrimination module, zero-sequence current discrimination module is all connected the signal input part of OR circuit with the signal output part of overcurrent discrimination module, the signal output part of OR circuit connects the first signal input part of AND circuit, the secondary signal input of AND circuit is connected on medium voltage side switch normally opened contact, described executive circuit comprises the time relay and main transformer three side switch, the signal output part connect hours relay coil of AND circuit, and three normally-closed contacts of the time relay are serially connected with on the switching circuit of main transformer three side respectively.
The utility model opens by detecting transformer medium voltage side the fault current that residing disjunction position and CT detect, zero-sequence current discrimination module and overcurrent discrimination module is sent to by Detection Information to process, again by the output of zero-sequence current discrimination module and overcurrent discrimination module through an OR circuit, form and door with medium voltage side switch normally opened contact again, elapsed time relay time delay, disconnected by time relay normally-closed contact, make the switch tripping of main transformer three side, protection wiring is simple fast for this, reliability is high, coordinate with the backup protection of transformer own, when quick excision medium voltage side switch co-bit and point position, neutral ground and earth-free transformer medium voltage side dead band single phase ground fault and phase-to phase fault.
Accompanying drawing explanation
Fig. 1 is 220 city, kV room transforming plant primary winding diagrams in background technology of the present utility model;
Fig. 2 is schematic block circuit diagram of the present utility model.
Embodiment
As shown in Figure 2, the utility model comprises logic distinguishing circuit and executive circuit, logic distinguishing circuit comprises medium voltage side current transformer, the secondary side zero-sequence current of medium voltage side current transformer gathers the signal input part of output connection zero-sequence current discrimination module, the secondary side overcurrent of medium voltage side current transformer gathers the signal input part of output connection overcurrent discrimination module, zero-sequence current discrimination module is all connected the signal input part of OR circuit with the signal output part of overcurrent discrimination module, the signal output part of OR circuit connects the first signal input part of AND circuit, the secondary signal input of AND circuit is connected on medium voltage side switch normally opened contact, described executive circuit comprises the time relay and main transformer three side switch, the signal output part connect hours relay coil of AND circuit, and three normally-closed contacts of the time relay are serially connected with on the switching circuit of main transformer three side respectively.
When meet transformer medium voltage side switch be in disjunction position summation current transformer CT fault current two conditions detected time; can judge it is transformer medium voltage side dead-zone fault; now other both sides switches of faster trip transformer just can excise fault point completely; relay protective scheme as shown in Figure 2; wherein fault current detection comprises zero-sequence current and overcurrent two parts; detect zero-sequence current in order to differentiate the single phase ground fault in neutral grounded transformer medium voltage side dead band, detection of excessive current can differentiate the phase-to phase fault in neutral ground and earth-free transformer medium voltage side dead band.Gap voltage (electric current) protection in transform er backup protection can isolate the single phase ground fault in the medium voltage side dead band of earth-free transformer at 0.5S, both cooperations can excise the various short circuiting work in 220kV transformer medium voltage side dead band fast.
The utility model in use, the zero-sequence current collected in medium voltage side switching current instrument transformer CT is exported to zero-sequence current discrimination module in digital transformer protector, overcurrent (phase current) exports overcurrent discrimination module to, by the output of zero-sequence current discrimination module and overcurrent discrimination module through an OR circuit, form and door with medium voltage side switch normally opened contact again, elapsed time relay time delay, disconnected by time relay normally-closed contact, make the switch tripping of main transformer three side, wherein the definite value of the time relay should be greater than switch quenching time and current detecting differentiation return time.
By improving the logic of 220kV transformer medium voltage side backup protection; adopting transformer medium voltage side switch to be in disjunction position summation current transformer CT, to detect that fault current two conditions can judge be transformer medium voltage side dead-zone fault, can protect this dead band fast.In zero-sequence current discrimination module, zero-sequence current and definite value are compared, if be greater than definite value, earth fault has been described; In overcurrent discrimination module, overcurrent compares with definite value, if be greater than definite value, phase-to phase fault has been described; As long as zero-sequence current discrimination module and overcurrent discrimination module have an action, then illustrate that transformer medium voltage side switch gap necessarily has fault.And medium voltage side normally opened contact is in order to judge whether being medium voltage side dead-zone fault, if the bus bar differential prptection operation of medium voltage side switch place bus, namely medium voltage side normally opened contact will close; If medium voltage side switch this in open position, then medium voltage side normally opened contact must close, and adding medium voltage side CT, to detect that fault current can judge be medium voltage side dead-zone fault.
Claims (1)
1. a transformer medium voltage side switching dead rapid protecting device, it is characterized in that: comprise logic distinguishing circuit and executive circuit, logic distinguishing circuit comprises medium voltage side current transformer, the secondary side zero-sequence current of medium voltage side current transformer gathers the signal input part of output connection zero-sequence current discrimination module, the secondary side overcurrent of medium voltage side current transformer gathers the signal input part of output connection overcurrent discrimination module, zero-sequence current discrimination module is all connected the signal input part of OR circuit with the signal output part of overcurrent discrimination module, the signal output part of OR circuit connects the first signal input part of AND circuit, the secondary signal input of AND circuit is connected on medium voltage side switch normally opened contact, described executive circuit comprises the time relay and main transformer three side switch, the signal output part connect hours relay coil of AND circuit, and three normally-closed contacts of the time relay are serially connected with on the switching circuit of main transformer three side respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420571236.6U CN204190359U (en) | 2014-09-30 | 2014-09-30 | A kind of transformer medium voltage side switching dead rapid protecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420571236.6U CN204190359U (en) | 2014-09-30 | 2014-09-30 | A kind of transformer medium voltage side switching dead rapid protecting device |
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| Publication Number | Publication Date |
|---|---|
| CN204190359U true CN204190359U (en) | 2015-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420571236.6U Expired - Fee Related CN204190359U (en) | 2014-09-30 | 2014-09-30 | A kind of transformer medium voltage side switching dead rapid protecting device |
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| Country | Link |
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| CN (1) | CN204190359U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105807691A (en) * | 2016-05-10 | 2016-07-27 | 广东新宝电器股份有限公司 | Drip coffee maker control circuit and integrated MCU |
| CN106093761A (en) * | 2016-06-06 | 2016-11-09 | 中国南方电网有限责任公司超高压输电公司 | Extra-high voltage direct-current by-pass switch position judging method and device |
| CN113945858A (en) * | 2021-02-02 | 2022-01-18 | 保定钰鑫电气科技有限公司 | Three-phase non-effective grounding power supply system convenient for processing single-phase grounding fault |
-
2014
- 2014-09-30 CN CN201420571236.6U patent/CN204190359U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105807691A (en) * | 2016-05-10 | 2016-07-27 | 广东新宝电器股份有限公司 | Drip coffee maker control circuit and integrated MCU |
| CN105807691B (en) * | 2016-05-10 | 2019-04-05 | 广东新宝电器股份有限公司 | A kind of leak through type coffee machine control circuit and integrated MCU |
| CN106093761A (en) * | 2016-06-06 | 2016-11-09 | 中国南方电网有限责任公司超高压输电公司 | Extra-high voltage direct-current by-pass switch position judging method and device |
| CN106093761B (en) * | 2016-06-06 | 2018-09-11 | 中国南方电网有限责任公司超高压输电公司 | Extra-high voltage direct-current by-pass switch position judging method and device |
| CN113945858A (en) * | 2021-02-02 | 2022-01-18 | 保定钰鑫电气科技有限公司 | Three-phase non-effective grounding power supply system convenient for processing single-phase grounding fault |
| CN113945858B (en) * | 2021-02-02 | 2024-03-01 | 保定钰鑫电气科技有限公司 | Three-phase non-effective grounding power supply system convenient for processing single-phase grounding fault |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150304 Termination date: 20150930 |
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| EXPY | Termination of patent right or utility model |