CN104332969A - Relay protection method for cascade switching station tie lines - Google Patents
Relay protection method for cascade switching station tie lines Download PDFInfo
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- CN104332969A CN104332969A CN201410588391.3A CN201410588391A CN104332969A CN 104332969 A CN104332969 A CN 104332969A CN 201410588391 A CN201410588391 A CN 201410588391A CN 104332969 A CN104332969 A CN 104332969A
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Abstract
The invention discloses a relay protection method for cascade switching station tie lines. Longitudinal overcurrent protection is configured for the tie line interval of adjacent switching stations as main protection to tie line faults; in case of a fault, after the longitudinal overcurrent of a power supply side corresponding to the fault point is activated and when no longitudinal overcurrent start blocking signal of a load side is received, a period of set time is delayed and confirmed, and then action is performed and a switch on the local side is tripped; meanwhile, a shunt tripping signal is transmitted to a switching station protector on the load side; when the load side corresponding to the fault point receives the shunt tripping signal of the power supply side and the longitudinal overcurrent on the local side is not activated, a period of set time is delayed and confirmed, and a switch on the local side is tripped, and consequently, fault isolation is completed. For the cascade connection mode of 10kV switching stations in urban areas, the relay protection method for the cascade switching station tie lines is used for effectively solving the frequent override tripping phenomenon of 10kV distribution networks in the urban areas in the connection mode, and therefore, the fault range is prevented from expanding in case of accidents and the reliability and safety of 10kV power supply systems in the urban areas are improved.
Description
Technical field
The present invention, belongs to the relaying protection automatic field in power engineering field, is applicable to various cascaded switch station, opening and closing ring main unit unit in one's power, is specifically related to a kind of cascade switching station interconnection relay protecting method.
Background technology
Along with the increase of electric load, in order to solve the problems such as high voltage substation medium-voltage distribution outlet switch cabinet lazy weight, electric outgoing line corridor is limited, contact turn supplies mode dumb, a large amount of switching stations has been built in the electric power system of city, there is the switching station of cascade system, as shown in Figure 1, two inlet wires of switching station are from the different 10kV bus of same transformer station or different transformer stations for typical wiring mode.Opening and closing is done single mother partition wiring, normal two sections of bus splittings when running." hand in hand " between switching station and form level tie, between figure switch 2,5, between 4,7, between 6,9, between 8,11, between 10,13, between 12,15, be " handing in hand " interconnection.
Because the capacity of modern city power distribution network is large; in the region that load density is larger; transformer station is to the 10kV supply line of switching station; and switching station outlet adopts cable in a large number, line length is shorter, conveniently the relaying configuration of three-step charging and setting method; cascade switching station interconnection current protection cannot realize the superior and the subordinate's protection cooperation; during fault, current protection will lose selectivity, occurs the phenomenon of overstep tripping, the expansion of the power failure range that causes the accident.As shown in Figure 1; when K1 point breaks down, interconnection switch 4,7,8,11,12 all flows through fault current and meets overcurrent operation condition, owing to realizing Graded coordination; all may there is overstep tripping in switch 4,7,8,11 place's protective device, expand accident interruption scope.Even if increase discriminating direction in overcurrent protection, still may there is overstep tripping in switch 4,8 place's protective device.
Summary of the invention
The object of this invention is to provide a kind of cascade switching station interconnection relay protecting method, the superior and the subordinate's protection cooperation cannot be realized to solve existing cascade switching station interconnection current protection, during fault, occur the problem of overstep tripping phenomenon.
In order to realize above object, the technical solution adopted in the present invention is: a kind of cascade switching station interconnection relay protecting method, in the main protection of the interconnection interval of adjacent switching station configuration vertical connection overcurrent protection as fault of interconnected transmission line, when a failure occurs, mains side corresponding to fault point indulge connection overcurrent start and the vertical overcurrent not receiving load side starts block signal time, time delay one section of setting-up time carries out confirming rear action and jumps this side switch, sends out connection simultaneously and jumps signal to load side switching station protective device; Load side corresponding to fault point receive mains side connection jump signal and this side vertical connection overcurrent does not start time, time delay one section of setting-up time carries out confirming this side switch of rear tripping, completes Fault Isolation.
Also be configured with overcurrent protection in limited time at the interconnection interval of adjacent switching station and coordinate backup protection as fault of interconnected transmission line with under-voltage protection; in communication abnormality situation, the overcurrent protection of vertical connection is exited; when a failure occurs; overcurrent protection in limited time and under-voltage protection drop into; mains side corresponding to fault point is prescribed a time limit this side switch of overcurrent action tripping; this side switch of load side under-voltage protection action tripping that simultaneous faults point is corresponding, completes selectivity Fault Isolation.
Overcurrent protection in limited time and under-voltage protection time delay arrange setting guard time, and this setting guard time is greater than Graded coordination time when busbar fault and outgoing fault in switching station.
Also failure protection is configured with at the interconnection interval of adjacent switching station; when a failure occurs; indulge connection overcurrent or actuating breaker failure protection after prescribe a time limit overcurrent and under-voltage protection action; if corresponding power side or load side switch have electric current or are in co-bit after waiting for setting-up time; then failure protection action outlet, other interconnection switch on the corresponding section bus of tripping.
The Graded coordination time in switching station when busbar fault and outgoing fault is 0.3s, and the delay adjustments guard time that overcurrent protection in limited time and under-voltage protection time delay are arranged is 0.35s.
During vertical connection overcurrent protection, the setting check time of time delay is 50ms.
The block signal transmitted in the overcurrent protection of vertical connection and connection are jumped signal and are GOOSE signal.
The built-in ONU module of switching station protective device, carries out the transmission of GOOSE signal by EPON network.
Cascade switching station interconnection relay protecting method of the present invention is for the city 10kV switching station cascade mode of connection; in the main protection of adjacent switching station interconnection interval configuration vertical connection overcurrent protection as fault of interconnected transmission line; and configuration overcurrent protection in limited time coordinates the backup protection as fault of interconnected transmission line with under-voltage protection; the overstep tripping phenomenon often occurred under efficiently solving this mode of connection of city 10kV distribution; the fault coverage avoided under accident conditions expands, and improves reliability and the fail safe of city 10kV electric power system.
Accompanying drawing explanation
Fig. 1 is cascade switching station wiring schematic diagram;
Fig. 2 is vertical connection overcurrent protection logic diagram;
Fig. 3 GOOSE communication schematic diagram.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is described further.
Cascade switching station interconnection relay protecting method of the present invention is in the main protection of the interconnection interval of adjacent switching station configuration vertical connection overcurrent protection as fault of interconnected transmission line, be illustrated in figure 2 the logic diagram of vertical connection overcurrent protection, as seen from the figure, when a failure occurs, mains side corresponding to fault point indulge connection overcurrent start and the vertical overcurrent not receiving load side starts block signal time, time delay one section of setting-up time carries out confirming rear action and jumps this side switch, sends out connection simultaneously and jumps signal to load side switching station protective device; Load side corresponding to fault point receive mains side connection jump signal and this side vertical connection overcurrent does not start time, time delay one section of setting-up time carries out confirming this side switch of rear tripping, completes Fault Isolation.
In the present embodiment, the delay confirmation time of above-mentioned vertical overcurrent is 50ms.
In addition; the present invention is also configured with overcurrent protection in limited time and coordinates backup protection as fault of interconnected transmission line with under-voltage protection at the interconnection interval of adjacent switching station; consider and the Graded coordination (0.3) when busbar fault in switching station and outgoing fault, overcurrent protection in limited time and under-voltage protection time delay arrange 0.35s.
In communication abnormality situation, the overcurrent protection of vertical connection is exited; when a failure occurs; overcurrent protection in limited time and under-voltage protection drop into; mains side corresponding to fault point is prescribed a time limit this side switch of overcurrent action tripping; this side switch of load side under-voltage protection action tripping that simultaneous faults point is corresponding, completes selectivity Fault Isolation.
For ensureing the fail safe of relaying protection further; also failure protection is configured with at the interconnection interval of adjacent switching station; when a failure occurs; indulge connection overcurrent or actuating breaker failure protection after prescribe a time limit overcurrent and under-voltage protection action; if corresponding power side or load side switch have electric current or are in co-bit after waiting for setting-up time; then failure protection action outlet, other interconnection switch on the corresponding section bus of tripping.
The block signal transmitted in the overcurrent protection of vertical connection and connection are jumped signal and are GOOSE signal; as shown in Figure 3; after the protection CPU completion logic differentiation of switching station protective device, GOOSE signal is sent to the electric power special line data communication module ONU (as shown in switching station protective device in figure 3) being integrated in device inside, then be sent to electric power special line data transmission network EPON by ONU module through optical line terminal equipment OLT.Equally, CPU is protected can to receive required GOOSE signal from network.
Be described with the cascade switching station shown in Fig. 1 below, switch 2,4,5 ~ 12 interval, place in FIG all configures above-mentioned various protection.
Vertical connection overcurrent protection: when K1 point failure, switch 4,7,8,11,12 places vertical connection overcurrent all starts, if communication is normal, then according to vertical connection overcurrent operating principle, switch 4,7,8,11 places vertical connection overcurrent is failure to actuate owing to receiving corresponding block signal; Switch 12 place vertical connection overcurrent starts block signal owing to not receiving switch 15 place vertical connection overcurrent, meets operation condition TRIP 12 after 50ms confirms, sends out connection simultaneously and jump signal to switch 15; Switch 15 place receives the connection jumping signal that switch 12 sends, and vertical connection overcurrent does not start simultaneously, and tripping switch 15 after 50ms confirms, completes Fault Isolation.
If supplier of electricity is to change, then according to vertical connection overcurrent protection principle, switch 15 place vertical connection overcurrent is by overcurrent starting operation, and switch 12 place vertical connection overcurrent is by joining jumping signalizing activity.
The overcurrent protection of vertical connection is exited in communication abnormality situation, and overcurrent protection in limited time coordinates the backup protection as fault of interconnected transmission line with under-voltage protection, only drop in communication abnormality situation.
Overcurrent and under-voltage protection in limited time: when K1 point failure, if the communication abnormality between switch 12 and 15, then overcurrent protection in limited time and under-voltage protection drop into, and after 0.35s time delay, switch 12 place prescribes a time limit overcurrent action, tripping switch 12; Switch 15 place under-voltage protection action tripping switch 15, completes selectivity Fault Isolation.If supplier of electricity is to change, then switch 15 place prescribes a time limit overcurrent protection action, the under-voltage protection action of switch 12 place, selective ablation fault.
Owing to considering time delay Graded coordination (0.35s), when the feeder line in switching station 4 or busbar fault, protection can not malfunction.
When K1 point failure, if other interconnection communication abnormality, as the communication abnormality between switch 4 and 7, then the overcurrent protection in limited time of switch 4,7 and under-voltage protection drop into.Because the vertical overcurrent protection action of fault interconnection (between switch 12,15) excises fault fast, the overcurrent protection in limited time of switch 4,7 and under-voltage protection are not arrived due to time delay can not malfunction.
Failure protection: when K1 point failure, switch 12 place vertical connection overcurrent action TRIP 12.If switch 12 place has electric current or switch to be in co-bit after 0.2s, then failure protection action outlet tripping switching station 3 switch 11 and 27 (if 27 are in "on" position).In like manner, if switch 15 is malfunctioning, then failure protection action tripping switching station 4 switch 16 and 28 (if 28 are in "on" position).
Above embodiment only understands core concept of the present invention for helping; the present invention can not be limited with this; for those skilled in the art; every according to thought of the present invention; the present invention is modified or equivalent replacement; any change done in specific embodiments and applications, all should be included within protection scope of the present invention.
Claims (8)
1. a cascade switching station interconnection relay protecting method, it is characterized in that: in the main protection of the interconnection interval of adjacent switching station configuration vertical connection overcurrent protection as fault of interconnected transmission line, when a failure occurs, mains side corresponding to fault point indulge connection overcurrent start and the vertical overcurrent not receiving load side starts block signal time, time delay one section of setting-up time carries out confirming rear action and jumps this side switch, sends out connection simultaneously and jumps signal to load side switching station protective device; Load side corresponding to fault point receive mains side connection jump signal and this side vertical connection overcurrent does not start time, time delay one section of setting-up time carries out confirming this side switch of rear tripping, completes Fault Isolation.
2. cascade switching station interconnection relay protecting method according to claim 1; it is characterized in that: be also configured with overcurrent protection in limited time at the interconnection interval of adjacent switching station and coordinate backup protection as fault of interconnected transmission line with under-voltage protection; in communication abnormality situation, the overcurrent protection of vertical connection is exited; when a failure occurs; overcurrent protection in limited time and under-voltage protection drop into; mains side corresponding to fault point is prescribed a time limit this side switch of overcurrent action tripping; this side switch of load side under-voltage protection action tripping that simultaneous faults point is corresponding, completes selectivity Fault Isolation.
3. cascade switching station interconnection relay protecting method according to claim 2; it is characterized in that: overcurrent protection in limited time and under-voltage protection time delay arrange setting guard time, and this setting guard time is greater than Graded coordination time when busbar fault and outgoing fault in switching station.
4. cascade switching station interconnection relay protecting method according to claim 3; it is characterized in that: be also configured with failure protection at the interconnection interval of adjacent switching station; when a failure occurs; indulge connection overcurrent or actuating breaker failure protection after prescribe a time limit overcurrent and under-voltage protection action; if corresponding power side or load side switch have electric current or are in co-bit after waiting for setting-up time; then failure protection action outlet, other interconnection switch on the corresponding section bus of tripping.
5. cascade switching station interconnection relay protecting method according to claim 3; it is characterized in that: the Graded coordination time in switching station when busbar fault and outgoing fault is 0.3s, the delay adjustments guard time that overcurrent protection in limited time and under-voltage protection time delay are arranged is 0.35s.
6. cascade switching station interconnection relay protecting method according to claim 1, is characterized in that: during vertical connection overcurrent protection, the setting check time of time delay is 50ms.
7. cascade switching station interconnection relay protecting method according to claim 1, is characterized in that: the block signal transmitted in the overcurrent protection of vertical connection and connection are jumped signal and be GOOSE signal.
8. cascade switching station interconnection relay protecting method according to claim 7, be is characterized in that: the built-in ONU module of switching station protective device, is carried out the transmission of GOOSE signal by EPON network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410588391.3A CN104332969A (en) | 2014-10-28 | 2014-10-28 | Relay protection method for cascade switching station tie lines |
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| CN201410588391.3A CN104332969A (en) | 2014-10-28 | 2014-10-28 | Relay protection method for cascade switching station tie lines |
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| CN201410588391.3A Pending CN104332969A (en) | 2014-10-28 | 2014-10-28 | Relay protection method for cascade switching station tie lines |
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Cited By (3)
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| CN105375635A (en) * | 2015-12-02 | 2016-03-02 | 国家电网公司 | Method and system of intelligent management of power distribution network cascading switching stations |
| CN106154106A (en) * | 2015-04-14 | 2016-11-23 | 济南置真电气有限公司 | Layering cascade system failure line selection logic decision method based on route selection result |
| CN108123424A (en) * | 2017-12-29 | 2018-06-05 | 国电南瑞科技股份有限公司 | A kind of ring network power supply relay protecting method for taking into account quick-action and selectivity |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154106A (en) * | 2015-04-14 | 2016-11-23 | 济南置真电气有限公司 | Layering cascade system failure line selection logic decision method based on route selection result |
| CN105375635A (en) * | 2015-12-02 | 2016-03-02 | 国家电网公司 | Method and system of intelligent management of power distribution network cascading switching stations |
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| CN108123424A (en) * | 2017-12-29 | 2018-06-05 | 国电南瑞科技股份有限公司 | A kind of ring network power supply relay protecting method for taking into account quick-action and selectivity |
| CN108123424B (en) * | 2017-12-29 | 2019-09-24 | 国电南瑞科技股份有限公司 | A kind of ring network power supply relay protecting method for taking into account quick-action and selectivity |
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Application publication date: 20150204 |