CN103001196A - Relay production method for cutting transformer dead zone faults - Google Patents
Relay production method for cutting transformer dead zone faults Download PDFInfo
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- CN103001196A CN103001196A CN2012104533190A CN201210453319A CN103001196A CN 103001196 A CN103001196 A CN 103001196A CN 2012104533190 A CN2012104533190 A CN 2012104533190A CN 201210453319 A CN201210453319 A CN 201210453319A CN 103001196 A CN103001196 A CN 103001196A
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Abstract
The invention belongs to the technology of power transmission and distribution network control and relates to a relay production method for cutting transformer dead zone faults. The relay production method is characterized in that the following conditions are set under tripping control of faults in a certain dead zone of a transformer: 1 a backup protection tripping outlet relay on the dead zone side of the transformer is located in acting state or other electric amount protection tripping outlet relays are located in acting state; and 2 A-phase current, B-phase current and C-phase current on the dead zone side of the transformer reaches a setting value, or zero-sequence current or negative-sequence current is larger than or equal to the setting value. When any one of the two conditions is met, one set value is delayed, then a differential protection total tripping outlet relay loop of the transformer is started, and breakers on all sides of the transformer is tripped off through starting, so that faults in the dead zone of the transformer can be cut fast; and when not any condition is met, returning is performed immediately, the differential protection total tripping outlet relay loop of the transformer is opened. The relay production method is simple in acting principle, high in reliability and capable of fast cutting all voltage-stage dead zone faults on all sides of the transformer.
Description
Technical field
The invention belongs to the control technology of power transmission and distribution network, relate to the relay protecting method that excises failure in transformer dead zone.
Background technology
GB/T 14285-2006 " relaying protection and automatic safety device technical regulation " regulation; transformer should be installed longitudinal differential protection causes the transformer overcurrent as main protection and reaction outside phase fault and ground short circuit the electric parameters such as backup protection protection; the backup protection of wherein reacting phase fault has composite voltage overcurrent protection, phase to phase impedance protection, and the backup protection of reaction ground short circuit has zero-sequence current protection, impedance ground protection.These backup protections are different with each side electric pressure according to the transformer of different electric pressures, install different backup protections, and generally all install the backup protection of the outside phase fault of reaction and ground short circuit in each side of transformer.220kV and above tranformer protection configuring condition have concrete regulation at Q/GDW_175-2008_ " transformer, high-voltage shunt reactor and bus protection and servicing unit standardized designs standard "; The configuration of 110kV and following tranformer protection mainly in the composite voltage overcurrent protection of each side installing two-stage reaction phase fault (if the 110kV neutral point is general when earth-free, then disposed zero-sequence current protection also generally need not, only use the 110kV neutral point gap relay; If during the general ground connection of 110kV neutral point, then disposed the zero-sequence current protection use, the 110kV neutral point gap relay is stopped using).
So-called failure in transformer dead zone means the short trouble (see figure 2) between the current transformer (hereinafter to be referred as TA) of the circuit breaker that occurs in a certain side of transformer and this side transformer differential protection use.Because this fault is outside transformer longitudinal linked differential protection protection range, although the backup protection of fault side or other protection (such as bus protection) action, this side circuit breaker of tripping transformer, but fault still exists, only have by the standby protection in transformer frequency response rear flank and move or adopt the final excision of the standby protection action in this rear flank connection saltus step depressor general export relay circuit tripping transformer frequency response side circuit breaker ability fault, the excision of this kind situation is generally longer fault time; If transformer is high-impedance transformer; the standby protection in transformer frequency response rear flank may start definite value and akinesia excision fault because short circuit current reaches, and only has by the time transformer to burn to make short circuit current meet and exceed this protection startup value the standby protection action in transformer frequency response rear flank is excised till the fault.Although proposed to judge the scheme of other side circuit breakers of connection saltus step depressor behind the dead-zone fault among the patent of invention ZL200810201305.3 " relay protecting method of eliminating transformer dead-zone fault ", excision is still slightly long fault time, and only adapts to the 110kV transformer.The present invention will propose to adopt the another one logical circuit to finish the power transformation that adapts to applied transmission and distribution networks the do protection equipment for transformer of various electric pressures and the quick Protection Technology scheme of the various electric pressure dead-zone faults of excision each side of transformer.
Summary of the invention
Problem to be solved by this invention is; it is various electric pressure electric substation protection equipment for transformer that a kind of transmission and distribution networks that can be applied to is provided, and operating principle is simple, reliability is high, can excise fast the relay protecting method of the various electric pressure dead-zone faults of each side of transformer.
The below provides the technical scheme of the inventive method.
At the do protective device of two-winding transformer, three-winding transformer, autotransformer or other transformers of various electric pressures of the power transformation of the applied transmission and distribution networks of method of the present invention; In theory, transformer has several working voltage grades to link to each other with external circuit equipment by breaker interval equipment (being comprised of equipment such as isolating switch, circuit breaker, current transformers), several failure in transformer dead zone position is just arranged, namely there are 2 working voltage grades to link to each other with external circuit equipment by breaker interval equipment, just have 2 failure in transformer dead zone positions at least; There are 3 working voltage grades to link to each other with external circuit equipment by breaker interval equipment, just have 3 failure in transformer dead zone positions (if 1 working voltage grade has 2 breaker interval equipment, then this working voltage grade side is 2 failure in transformer dead zone positions) at least.
For sake of convenience, breaker interval equipment generation failure in transformer dead zone with one of them working voltage grade of transformer, describe quick startup and excise the method for this fault, the transformer of other electric pressure and transformer are two-winding transformer, three-winding transformer, autotransformer or other transformers, or each side of transformer is by the combination of other electric pressure, its method is similar, no longer tired stating.This breaker interval equipment is comprised of equipment such as isolating switch, circuit breaker, TA; TA has respectively several groups of secondary winding, and these several groups of secondary winding access respectively the secondary devices such as transformer differential protection (backup protection), bus differential protecting, measuring from bus bar side to transformer side.The bushing shell for transformer place has also installed sleeve pipe TA.The TA that the standby protection in 110kV and each rear flank of following transformer is used separates with transformer differential protection, and the TA of use is that different TA(uses the circuit breaker TA of place such as differential protection, and sleeve pipe TA is used in the reserve protection), or the different secondary winding of TA.Its control method comprises following control procedure:
In the tripping operation control of transformer side dead-zone fault, set following condition:
Condition one, the standby trip protection exit relay in this rear flank of transformer are in operate condition or other electric parameters protection (such as this side bus differential protection) tripping operation exit relay is in operate condition;
Condition two, this side of transformer A phase or B phase or C phase current reach setting value, or zero-sequence current or negative-sequence current 〉=setting value;
When above-mentioned arbitrary condition satisfied, starting transformer differential protection tripping operation general export relay circuit started each side circuit breaker of tripping transformer, thereby reaches this failure in transformer dead zone of quick excision after the t1 definite value (such as 150ms) of delaying time; When above-mentioned arbitrary condition does not satisfy, return immediately, disconnect starting transformer differential protection tripping operation general export relay circuit.
Relay protecting method that excises fast failure in transformer dead zone of the present invention is compared with the method for existing excision failure in transformer dead zone, has following advantage:
1. the do technical scheme of the two-winding transformer of various electric pressures, three-winding transformer, the isallobaric device protective device of autotransformer of the power transformation that is applicable to transmission and distribution networks.
2. the method adopts the rear just direct starting transformer differential protection tripping operation general export relay circuit of certain time-delay (such as 150ms) after judging dead-zone fault, start each side circuit breaker of tripping transformer, criterion is simple and practical, has reached the purpose of this dead band fault of quick excision;
3. owing to do not add breaker open operation position contact in the criterion; for electric substation's side bus fault; the standby protection action in bus protection action or transformer fault rear flank; but transformer fault side circuit breaker miss operation (breaker failure); the present invention program also can be after judging the circuit breaker tripping direct starting transformer differential protection tripping operation general export relay circuit just after a time-delay time limit (such as 150ms); start each side circuit breaker of tripping transformer, thereby excise fast this fault.
Description of drawings
Fig. 1 is a certain side dead-zone fault of transformer starting transformer differential protection tripping operation general export relay circuit logic diagram among the inventive method embodiment;
Fig. 2 is existing main wiring diagram of 220kV electric substation part.
Symbol description is as follows among Fig. 1:
Embodiment
Take 220kV autotransformer protection of 220kV electric substation as example; the method that failure in transformer dead zone starts this fault of excision is fast described; the transformer of other electric pressure and transformer are two-winding transformer, three-winding transformer, autotransformer or other transformers; or each side of transformer is by the combination of other electric pressure; its method is similar, no longer tired stating.As shown in Figure 2, be main wiring diagram of 220kV electric substation part, a 220kV autotransformer, transformer are equiped with high-pressure side circuit breaker 1QF, medium voltage side circuit breaker 2QF, low-pressure side circuit breaker 3QF; Circuit breaker 1QF place, high-pressure side, medium voltage side circuit breaker 2QF place, low-pressure side circuit breaker 3QF place are equiped with respectively one group of independently TA, and TA has respectively several groups of secondary winding, and high voltage side of transformer, medium voltage side and neutral point place have also installed sleeve pipe TA.Each the side TA configuration of 220kV transformer as shown in Figure 2, wherein high voltage side of transformer (220kV) the circuit breaker TA of place secondary winding is connected to respectively first set transformer longitudinal differential and backup protection by bus bar side to transformer side, (the 220kV tranformer protection generally adopts main protection and backup protection unified collocation for the second cover transformer longitudinal differential and backup protection, be the public same group of TA secondary winding of each side of main protection and backup protection, secondary windings of PT, and main protection and backup protection all hardware equipment and software are in same cabinet), first set 220kV bus differential protecting, the second cover 220kV bus differential protecting (is pressed Q/GDW_175-2008_ " transformer, high-voltage shunt reactor and bus protection and servicing unit standardized designs standard " design tranformer protection special breaker failure current circuit is not set, realized by bus differential protecting; Otherwise have special breaker failure current circuit is set), metering, measure; Transformer medium voltage side (110kV) the circuit breaker TA of place secondary winding is connected to respectively first set transformer longitudinal differential and backup protection, the second cover transformer longitudinal differential and backup protection, 110kV bus differential protecting, metering, measurement by bus bar side to transformer side; Step down side (35kV or the 10kV etc.) TA of circuit breaker place secondary winding is connected to respectively first set transformer longitudinal differential and backup protection, the second cover transformer longitudinal differential and backup protection (bus protection), failure wave-recording, metering, measurement etc. by bus bar side to transformer side.
Judge that transformer this side A phase or B phase or C also have electric current mutually, can gather this side differential protection of transformer TA electric current, can be set to (0.5-1) times high voltage side of transformer rated current by current ration; When this side of transformer was effectively earthed system, zero-sequence current or negative-sequence current definite value can be adjusted and be 120A-180A.
When a certain side electric pressure of transformer was 35kV and following system, this system was generally isolated neutral system or compensated distribution network, and then this side zero-sequence current criterion of transformer can.If resistance grounded system, then this side zero-sequence current criterion of transformer can be used.
The below provides the inventive method and is applied to the embodiment that failure in transformer dead zone excises this fault fast:
1, the quick cutting method of high voltage side of transformer dead-zone fault
(1) when the high-pressure side TA(that high voltage side of transformer circuit breaker lQF and transformer differential protection use be the TA at circuit breaker place, high-pressure side) between when phase fault or earth fault occur; fault is outside transformer longitudinal linked differential protection scope; but within first set 220kV bus differential protecting, the second cover 220kV bus differential protecting protection range, first set 220kV bus differential protecting, the second cover 220kV bus differential protecting start tripping all switches of this fault bus (containing high voltage side of transformer circuit breaker lQF).If other side of transformer has power supply; although tripping of circuit breaker 1QF; but fault is excision not; fault phase still has electric current or zero-sequence current or negative-sequence current to surpass setting value; so first set 220kV bus differential protecting; the second cover 220kV bus differential protecting still move and do not return (or the high voltage side of transformer backup protection start delay time still move to backup protection do not return); so judging two conditions of dead-zone fault satisfies; after time-delay one specified time (such as 150ms); starting transformer differential protection tripping operation general export relay circuit; start each side circuit breaker of tripping transformer, excised this fault.
(2) at open position above-mentioned high voltage side of transformer dead-zone fault occurs as high voltage side of transformer circuit breaker lQF; fault is outside transformer longitudinal linked differential protection scope; but within first set 220kV bus differential protecting, the second cover 220kV bus differential protecting protection range, first set 220kV bus differential protecting, the second cover 220kV bus differential protecting start all switches of this fault bus of tripping.If other side of transformer has power supply; although circuit breaker 1QF is at open position; but fault phase has short circuit current or zero-sequence current or negative-sequence current to surpass setting value; first set 220kV bus differential protecting, the second cover 220kV bus differential protecting action or high voltage side of transformer backup protection start delay time to action; so judging two conditions of dead-zone fault satisfies; after time-delay one specified time (such as 150ms); starting transformer differential protection tripping operation general export relay circuit; start each side circuit breaker of tripping transformer, excised this fault.
(3) if the 220kV busbar fault; although two cover 220kV bus differential protecting actions; two cover 220kV bus differential protectings start other all switches of this fault bus of tripping; but high voltage side of transformer circuit breaker lQF miss operation; if other side of transformer has power supply; then not excision of fault; fault phase still has electric current or zero-sequence current or negative-sequence current to surpass setting value; so first set 220kV bus differential protecting; the second cover 220kV bus differential protecting still move and do not return (or the high voltage side of transformer backup protection start delay time still move to backup protection do not return); so judging two conditions of dead-zone fault satisfies; after time-delay one specified time (such as 150ms); starting transformer differential protection tripping operation general export relay circuit; start each side circuit breaker of tripping transformer, excised this fault.
(4) if this other side of electric substation's transformer does not have power supply; then the transformer fault side does not have fault current to flow through; do not satisfy each side circuit breaker that just can starting transformer differential protection tripping operation general export relay circuit saltus step depressor so judge two conditions of dead-zone fault.
2, the quick cutting method of transformer medium voltage side dead-zone fault
(1) when the medium voltage side TA(that transformer medium voltage side circuit breaker 2QF and transformer differential protection use be the TA at medium voltage side circuit breaker place) between when phase fault or earth fault occur; fault is outside transformer longitudinal linked differential protection scope; but within the protection range of 110kV bus differential protecting; the 110kV bus differential protecting starts tripping all switches of this fault bus (containing transformer medium voltage side circuit breaker 2QF); although tripping of circuit breaker 2QF; but fault is excision not; fault phase still has electric current or zero-sequence current or negative-sequence current to surpass setting value; so the 110kV bus differential protecting still move and do not return (or the backup protection of transformer medium voltage side start delay time still move to backup protection do not return); so then judging two conditions of dead-zone fault satisfies; after time-delay one specified time (such as 150ms); starting transformer differential protection tripping operation general export relay circuit; start each side circuit breaker of tripping transformer, excised this fault.
(2) at open position above-mentioned transformer medium voltage side dead-zone fault occurs as transformer medium voltage side circuit breaker 2QF; fault is outside transformer longitudinal linked differential protection scope; but within 110kV bus differential protecting protection range, the 110kV bus differential protecting starts all switches of this fault bus of tripping.Although circuit breaker 2QF is at open position; but fault phase has short circuit current or zero-sequence current or negative-sequence current to surpass setting value; the action of 110kV bus differential protecting or the backup protection of transformer medium voltage side start delay time to action; so judging two conditions of dead-zone fault satisfies; after time-delay one specified time (such as 150ms); starting transformer differential protection tripping operation general export relay circuit, each side circuit breaker of startup tripping transformer has excised this fault.
(3) if the 110kV busbar fault; although 110kV bus differential protecting action; the 110kV bus differential protecting starts other all switches of this fault bus of tripping; but transformer medium voltage side circuit breaker 2QF tripping; but fault is excision not; fault phase still has electric current or zero-sequence current or negative-sequence current to surpass setting value; so the 110kV bus differential protecting still move and do not return (or the backup protection of transformer medium voltage side start delay time still move to backup protection do not return); so judging two conditions of dead-zone fault satisfies; after time-delay one specified time (such as 150ms); starting transformer differential protection tripping operation general export relay circuit; start each side circuit breaker of tripping transformer, excised this fault.
3, the quick cutting method of step down side dead-zone fault
(1) the step down side electric pressure is generally 35kV and following system, and this system is generally isolated neutral system or compensated distribution network or grounded system via resistance.When low-pressure side TA(that step down side circuit breaker 3QF and transformer differential protection use is the TA at low-pressure side circuit breaker place) between when phase fault or earth fault (during grounded system via resistance) occur; fault is outside transformer longitudinal linked differential protection scope; but within the protection range of low-voltage bus bar differential protection; the low-voltage bus bar differential protection starts tripping all switches of this fault bus (containing step down side circuit breaker 3QF); although tripping of circuit breaker 3QF; but fault is excision not; fault phase still has electric current or negative-sequence current or zero-sequence current to surpass setting value (during grounded system via resistance); so the low-voltage bus bar differential protection still moves and does not return that (or the step down side backup protection is not (when having bus protection; by wherein a cover low-pressure side backup protection as bus protection) start delay time still move to backup protection do not return); so then judging two conditions of dead-zone fault satisfies; after time-delay one specified time (such as 150ms); starting transformer differential protection tripping operation general export relay circuit; start each side circuit breaker of tripping transformer, excised this fault.
(2) when step down side circuit breaker 3QF when above-mentioned low-pressure side dead-zone fault occurs in open position; fault is outside transformer longitudinal linked differential protection scope; but within the protection range of low-voltage bus bar differential protection; the low-voltage bus bar differential protection starts all switches of this fault bus of tripping; although circuit breaker 3QF is at open position; but fault phase still has electric current or negative-sequence current or zero-sequence current to surpass setting value (during grounded system via resistance); when low-voltage bus bar differential protection action or step down side backup protection (when not having bus protection; by wherein a cover low-pressure side backup protection as bus protection) start the delay time action; so then judging two conditions of dead-zone fault satisfies; after time-delay one specified time (such as 150ms); starting transformer differential protection tripping operation general export relay circuit; start each side circuit breaker of tripping transformer, excised this fault.
(3) if the low-voltage bus bar fault; although low-voltage bus bar differential protection action; the low-voltage bus bar differential protection starts other all switches of this fault bus of tripping; but step down side circuit breaker 2QF tripping; so fault is excision not; fault phase still has electric current or negative-sequence current to surpass setting value; the low-voltage bus bar differential protection still move and do not return (or the step down side backup protection start delay time still move to backup protection do not return); two conditions then judging dead-zone fault satisfy; after time-delay one specified time (such as 150ms); starting transformer differential protection tripping operation general export relay circuit; start each side circuit breaker of tripping transformer, excised this fault.
4, the quick cutting method of other failure in transformer dead zone
When a certain side electric pressure of transformer is 35kV and following system, this system is generally isolated neutral system or compensated distribution network or grounded system via resistance, and then the quick cutting method of this side dead-zone fault of transformer can be with reference to the quick cutting method of 220kV step down side dead-zone fault.This system was generally effectively earthed system when a certain side electric pressure of transformer was 220kV and above system, and then the quick cutting method of this side dead-zone fault of transformer can be with reference to the quick cutting method of 220kV high voltage side of transformer dead-zone fault.
When transformer is two-winding transformer, be equivalent to above-mentioned three-winding transformer and lacked a side, only need to consider that the quick cutting method of transformer both sides dead-zone fault is just passable.When a certain side electric pressure of transformer has two branches, can consider respectively that two quick cutting methods of dead-zone fault are just passable.
Claims (1)
1. relay protecting method that excises failure in transformer dead zone is characterized in that: in the tripping operation control of transformer side dead-zone fault, set following condition:
Condition one, the standby trip protection exit relay in this rear flank of transformer is in operate condition or other electric parameters trip protection exit relays are in operate condition;
Condition two, this side of transformer A phase or B phase or C phase current reach setting value, or zero-sequence current or negative-sequence current 〉=setting value;
When above-mentioned arbitrary condition satisfied, starting transformer differential protection tripping operation general export relay circuit started each side circuit breaker of tripping transformer, thereby reaches this failure in transformer dead zone of quick excision after the definite value of delaying time; When above-mentioned arbitrary condition does not satisfy, return immediately, disconnect starting transformer differential protection tripping operation general export relay circuit.
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| CN103280782A (en) * | 2013-05-08 | 2013-09-04 | 国家电网公司 | Relay protection method for clearing dead zone fault of transformer |
| CN103346534A (en) * | 2013-05-08 | 2013-10-09 | 国家电网公司 | Relay protection method for rapid clearing of dead-zone fault of transformer |
| CN103606890A (en) * | 2013-12-03 | 2014-02-26 | 国家电网公司 | Relay protection method fast removing transformer dead zone fault |
| CN103633621A (en) * | 2013-12-03 | 2014-03-12 | 国家电网公司 | Short-time opening protection based transformer dead zone fault relay protection method |
| CN103683199A (en) * | 2013-12-03 | 2014-03-26 | 国家电网公司 | Relay protection method for dead-zone faults of voltage transformers on basis of starting at switching positions |
| CN103762553A (en) * | 2014-01-27 | 2014-04-30 | 国家电网公司 | Relay protection method for accelerated removal of dead zone faults of transformer based on open positions of circuit breakers |
| CN103762551A (en) * | 2014-01-27 | 2014-04-30 | 国家电网公司 | Relay protection method for accelerated removal and TA sealing of dead zone faults of transformer based on open positions of circuit breakers |
| CN106129965A (en) * | 2016-06-17 | 2016-11-16 | 国网辽宁省电力有限公司锦州供电公司 | 220kv failure in transformer dead zone cutting method |
| CN106684822A (en) * | 2017-02-28 | 2017-05-17 | 许继集团有限公司 | Transformer dead-zone fault protection method and breaker failure protection method |
| CN116466154A (en) * | 2023-03-23 | 2023-07-21 | 国能大渡河流域水电开发有限公司 | Fault diagnosis method and device, storage medium and electronic equipment |
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| CN103346534A (en) * | 2013-05-08 | 2013-10-09 | 国家电网公司 | Relay protection method for rapid clearing of dead-zone fault of transformer |
| CN103280782A (en) * | 2013-05-08 | 2013-09-04 | 国家电网公司 | Relay protection method for clearing dead zone fault of transformer |
| CN103346534B (en) * | 2013-05-08 | 2016-03-30 | 国家电网公司 | The relay protecting method that failure in transformer dead zone excises fast |
| CN103280782B (en) * | 2013-05-08 | 2016-05-11 | 国家电网公司 | The relay protecting method of failure in transformer dead zone excision |
| CN103606890B (en) * | 2013-12-03 | 2017-01-11 | 国家电网公司 | Relay protection method fast removing transformer dead zone fault |
| CN103606890A (en) * | 2013-12-03 | 2014-02-26 | 国家电网公司 | Relay protection method fast removing transformer dead zone fault |
| CN103633621A (en) * | 2013-12-03 | 2014-03-12 | 国家电网公司 | Short-time opening protection based transformer dead zone fault relay protection method |
| CN103683199A (en) * | 2013-12-03 | 2014-03-26 | 国家电网公司 | Relay protection method for dead-zone faults of voltage transformers on basis of starting at switching positions |
| CN103633621B (en) * | 2013-12-03 | 2017-05-10 | 国家电网公司 | Short-time opening protection based transformer dead zone fault relay protection method |
| CN103762551A (en) * | 2014-01-27 | 2014-04-30 | 国家电网公司 | Relay protection method for accelerated removal and TA sealing of dead zone faults of transformer based on open positions of circuit breakers |
| CN103762553A (en) * | 2014-01-27 | 2014-04-30 | 国家电网公司 | Relay protection method for accelerated removal of dead zone faults of transformer based on open positions of circuit breakers |
| CN106129965A (en) * | 2016-06-17 | 2016-11-16 | 国网辽宁省电力有限公司锦州供电公司 | 220kv failure in transformer dead zone cutting method |
| CN106684822A (en) * | 2017-02-28 | 2017-05-17 | 许继集团有限公司 | Transformer dead-zone fault protection method and breaker failure protection method |
| CN116466154A (en) * | 2023-03-23 | 2023-07-21 | 国能大渡河流域水电开发有限公司 | Fault diagnosis method and device, storage medium and electronic equipment |
| CN116466154B (en) * | 2023-03-23 | 2023-12-29 | 国能大渡河流域水电开发有限公司 | Fault diagnosis method and device, storage medium and electronic equipment |
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