CN103346534B - The relay protecting method that failure in transformer dead zone excises fast - Google Patents

The relay protecting method that failure in transformer dead zone excises fast Download PDF

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CN103346534B
CN103346534B CN201310165747.8A CN201310165747A CN103346534B CN 103346534 B CN103346534 B CN 103346534B CN 201310165747 A CN201310165747 A CN 201310165747A CN 103346534 B CN103346534 B CN 103346534B
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transformer
current
protection
fault
differential
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CN103346534A (en
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汤大海
曹斌
陈永明
李民
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Zhenjiang Power Supply Co of Jiangsu Electric Power Co
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Zhenjiang Power Supply Co of Jiangsu Electric Power Co
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Abstract

The present invention relates to the relay protecting method that a kind of failure in transformer dead zone excises fast.The method <u> is in the tripping operation of </u> transformer side dead-zone fault controls, and set following condition: condition one, this side circuit breaker of transformer is in open position; This side of transformer A phase current or B phase current or C phase current exceed setting value, or zero-sequence current exceedes setting value or negative-sequence current exceedes setting value; When above-mentioned condition all meets, time delay this side transformer differential of definite value backed off after random transformer protection TA, namely this side electric current of transformer does not participate in transformer differential protection Current calculation; When above-mentioned arbitrary condition does not meet, access this side transformer differential of transformer TA immediately, namely this side electric current of transformer participates in transformer differential protection Current calculation.Operating principle of the present invention is simple, reliability is high, can excise the various electric pressure dead-zone fault in each side of transformer fast.

Description

The relay protecting method that failure in transformer dead zone excises fast
Technical field
The invention belongs to power transmission and distribution network-based control technology, relate to the relay protecting method that a kind of failure in transformer dead zone excises fast.
Background technology
GB/T14285-2006 " relaying protection and automatic safety device technical regulation " specifies; transformer should be installed longitudinal differential protection and cause the electric parameters protections such as the backup protection of transformer overcurrent as main protection with the outside phase fault of reaction and ground short circuit; the backup protection of wherein reacting phase fault has composite voltage overcurrent protection, phase to phase impedance to protect, and the backup protection of reaction ground short circuit has zero-sequence current protection, impedance ground to protect.These backup protections are different with each side electric pressure according to the transformer of different electric pressure, install different backup protections, and general backup protection of all installing 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 specification "; 110kV and the configuration of following tranformer protection mainly each side installing two-stage reaction phase fault composite voltage overcurrent protection (if 110kV neutral point general earth-free time, then be configured with zero-sequence current protection also generally need not, only use 110kV neutral point gap relay; If during the general ground connection of 110kV neutral point, be then configured with zero-sequence current protection and use, 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 referred to as TA) that the circuit breaker that occurs in transformer side and the protection of this side transformer differential use.Because this fault is outside transformer longitudinal linked differential protection protection range, although the backup protection of fault side or other protection (as bus protection) action, this side circuit breaker of tripping transformer, but fault still exists, only have by transformer frequency response rear flank for protection act or adopt this rear flank finally could excise fault for protection act connection saltus step depressor general export loop tripping transformer frequency response side circuit breaker, this kind of situation excision is general longer for fault time; If transformer is high-impedance transformer; the backup protection of transformer frequency response side may start definite value and akinesia excision fault because short circuit current does not reach, and only has by the time transformer to burn to make short circuit current meet and exceed protection initiation value to make transformer frequency response rear flank for till protection act excision fault.Although propose the scheme joining other side circuit breakers of saltus step depressor after judging dead-zone fault in patent of invention ZL200810201305.3 " relay protecting method of eliminating transformer dead-zone fault ", excision is still slightly long for fault time, and only adapts to 110kV transformer.
Summary of the invention
Problem to be solved by this invention is; thering is provided one can be applied to transmission and distribution networks is various electric pressure electric substations protection equipment for transformers, the relay protecting method that operating principle is simple, reliability is high, the failure in transformer dead zone of the various electric pressure dead-zone fault in the quick each side of excision transformer excises fast.
Provide the technical scheme of the inventive method below.
The power transformation of the transmission and distribution networks applied in method of the present invention is done the protective device of the two-winding transformer of various electric pressure, three-winding transformer, autotransformer or other transformers; In theory, transformer has several working voltage grade to be connected with external circuit equipment by breaker interval equipment (being made up of equipment such as isolating switch, circuit breaker, current transformers), just there is several failure in transformer dead zone position, namely there are 2 working voltage grades to be connected with external circuit equipment by breaker interval equipment, just have 2 failure in transformer dead zone positions at least; 3 working voltage grades are had to be connected 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, with the breaker interval equipment generation failure in transformer dead zone of one of them working voltage grade of transformer, the method starting 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, is no longer tired of and states.This breaker interval equipment is made up of equipment such as isolating switch, circuit breaker, TA; TA has several groups of secondary winding respectively, and these several groups of secondary winding access the secondary devices such as transformer differential protection (backup protection), bus differential protecting, measuring respectively from bus bar side to transformer side.Bushing shell for transformer place has also installed sleeve pipe TA.The TA that 110kV and the backup protection of following transformer each side use separates with transformer differential protection, and the TA of use is that different TA(such as differential protections uses circuit breaker place TA, and backup protection uses sleeve pipe TA), or the different secondary winding of TA.Its control method comprises following control procedure:
In the tripping operation of transformer side dead-zone fault controls, set following condition:
Condition one, this side circuit breaker of transformer is in open position;
Condition two, this side of transformer A phase current or B phase current or C phase current exceed setting value, or zero-sequence current exceedes setting value or negative-sequence current exceedes setting value;
When above-mentioned arbitrary condition meets, time delay this side transformer differential of definite value backed off after random transformer protection TA, namely this side electric current of transformer does not participate in transformer differential protection Current calculation; When above-mentioned arbitrary condition does not meet, access this side transformer differential of transformer TA immediately, namely this side electric current of transformer participates in transformer differential protection Current calculation.Because fault side electric current is exited transformer differential protection Current calculation by transformer differential protection; be equivalent to the comprehensive poor stream of transformer differential protection from being 0 or the very little short circuit current becoming short dot originally; this fault becomes troubles inside the sample space from external area error just to make transformer differential protection judge; transformer differential protection is with regard to the trip(ping) circuit of action launching transformer general export; other circuit breakers of tripping transformer, have excised this fault.
The setting value of above-mentioned kind of A phase current or B phase current or C phase current can be adjusted this side rated current of 1.2 times, transformer.When this side of transformer is effectively earthed system, zero-sequence current setting value or negative-sequence current setting value can be adjusted as 120A-180A.
The present invention is compared with the method for existing excision failure in transformer dead zone, and tool has the following advantages:
1. the power transformation being applicable to transmission and distribution networks is done the technical scheme of the two-winding transformer of various electric pressure, three-winding transformer, the isallobaric device protective device of autotransformer.
2. the method adopts time delay backed off after random transformer fault side transformer differential TA after judging dead-zone fault, and namely transformer fault side electric current does not participate in the method for transformer differential protection Current calculation, and criterion is simple and practical; After judging dead-zone fault, only just quick starting transformer differential protection after time delay, reaches the object of this dead-zone fault of excision fast.
Accompanying drawing explanation
Fig. 1 is that this side transformer differential of transformer TA logic diagram is exited in the transformer side dead-zone fault startup of the inventive method;
Fig. 2 is existing 220kV electric substation part primary connection circuit figure.
Embodiment
For the 220kV autotransformer protection of 220kV electric substation; the method of this fault of excision is started fast when describing failure in transformer dead zone; 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, is no longer tired of and states.As shown in Figure 2, be 220kV electric substation part primary connection circuit figure, a 220kV autotransformer, transformer is 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 be equiped with respectively one group independently TA, TA have several groups of secondary winding respectively, high voltage side of transformer, medium voltage side and neutral point place have also installed sleeve pipe TA.The each side TA of 220kV transformer configures, wherein high voltage side of transformer (220kV) circuit breaker place TA secondary winding is connected to first set transformer longitudinal differential and backup protection by bus bar side respectively to transformer side, (220kV tranformer protection generally adopts main protection and backup protection unified collocation for second cover transformer longitudinal differential and backup protection, the i.e. public same group of TA secondary winding of main protection and each side of 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, second cover 220kV bus differential protecting is (by Q/GDW_175-2008_ " transformer, high-voltage shunt reactor and bus protection and servicing unit standardized designs specification " tranformer protection that designs do not arrange special breaker failure current circuit, realized by bus differential protecting, otherwise have and special breaker failure current circuit be set), metering, measure, transformer medium voltage side (110kV) circuit breaker place TA secondary winding is connected to 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 respectively to transformer side, step down side (35kV or 10kV etc.) circuit breaker place TA secondary winding is connected to first set transformer longitudinal differential and backup protection, the second cover transformer longitudinal differential and backup protection (bus protection), failure wave-recording, metering, measurement by bus bar side respectively to transformer side.
Provide the inventive method below and be 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) as the TA at the high-pressure side TA(that high voltage side of transformer circuit breaker lQF and transformer differential protection use and circuit breaker place, high-pressure side) between when there is phase fault or earth fault, 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 (containing high voltage side of transformer circuit breaker lQF); Or high voltage side of transformer backup protection starts tripping high voltage side of transformer circuit breaker lQF.If there is power supply other side of transformer; although circuit breaker 1QF tripping at open position; but fault is not excised; faulted phase current exceedes setting value or zero-sequence current exceedes setting value or negative-sequence current exceedes setting value; therefore judge that two conditions of dead-zone fault meet; after time delay 150ms, exit transformer high-voltage side transformer differential TA, namely high voltage side of transformer electric current does not participate in transformer differential protection Current calculation.Because fault side electric current is exited transformer differential protection Current calculation by transformer differential protection; be equivalent to the comprehensive spill current of transformer differential protection from being 0 or the very little short circuit current becoming short dot originally; this dead-zone fault becomes troubles inside the sample space from external area error just to make transformer differential protection judge; transformer differential protection is with regard to the trip(ping) circuit of action launching transformer general export; other circuit breakers of saltus step depressor, have excised this fault.
(2) when high voltage side of transformer circuit breaker lQF above-mentioned high-pressure side dead-zone fault occurs at open position; 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 or there is power supply other side of transformer, high voltage side of transformer backup protection starting operation.Although circuit breaker 1QF is at open position; but fault phase has short circuit current to exceed setting value or zero-sequence current exceedes setting value or negative-sequence current exceedes setting value; therefore judge that two conditions of dead-zone fault meet; after time delay 150ms; exit transformer high-voltage side transformer differential TA, namely high voltage side of transformer electric current does not participate in transformer differential protection Current calculation.Because fault side electric current is exited transformer differential protection Current calculation by transformer differential protection; be equivalent to the comprehensive spill current of transformer differential protection from being 0 or the very little short circuit current becoming short dot originally; this dead-zone fault becomes troubles inside the sample space from external area error just to make transformer differential protection judge; transformer differential protection is with regard to the trip(ping) circuit of action launching transformer general export; other circuit breakers of saltus step depressor, have excised this fault.
(3) if this other side of electric substation's transformer does not have power supply, then transformer fault side does not have fault current to flow through, therefore judges that two conditions of dead-zone fault do not meet, and would not start and exit transformer high-voltage side transformer differential TA.
2, the quick cutting method of transformer medium voltage side dead-zone fault
(1) as the TA at the medium voltage side TA(that transformer medium voltage side circuit breaker 2QF and transformer differential protection use and medium voltage side circuit breaker place) between when there is phase fault or earth fault, fault is outside transformer longitudinal linked differential protection scope, but within the protection range of 110kV bus differential protecting, 110kV bus differential protecting starts all switches of this fault bus of tripping (containing transformer medium voltage side circuit breaker 2QF); Or the backup protection of transformer medium voltage side starts tripping transformer medium voltage side circuit breaker 2QF.Although circuit breaker 2QF tripping at open position; but fault is not excised; faulted phase current exceedes setting value or zero-sequence current exceedes setting value or negative-sequence current exceedes setting value; then thus judge dead-zone fault two conditions meet; after time delay 150ms; exit transformer medium voltage side transformer differential TA, namely transformer medium voltage side electric current does not participate in transformer differential protection Current calculation.Because fault side electric current is exited transformer differential protection Current calculation by transformer differential protection; be equivalent to the comprehensive spill current of transformer differential protection from being 0 or the very little short circuit current becoming short dot originally; this dead-zone fault becomes troubles inside the sample space from external area error just to make transformer differential protection judge; transformer differential protection is with regard to the trip(ping) circuit of action launching transformer general export; other circuit breakers of saltus step depressor, have excised this fault.
(2) when transformer medium voltage side circuit breaker 2QF, at open position, above-mentioned medium voltage side dead-zone fault occurs, fault is outside transformer longitudinal linked differential protection scope, but within the protection range of 110kV bus differential protecting, 110kV bus differential protecting starts all switches of this fault bus of tripping, or transformer medium voltage side backup protection starting operation; Although circuit breaker 2QF is at open position; but fault phase has short circuit current to exceed setting value or zero-sequence current exceedes setting value or negative-sequence current exceedes setting value; then thus judge dead-zone fault two conditions meet; after time delay 150ms; exit transformer medium voltage side transformer differential TA, namely transformer medium voltage side electric current does not participate in transformer differential protection Current calculation.Because fault side electric current is exited transformer differential protection Current calculation by transformer differential protection; be equivalent to the comprehensive spill current of transformer differential protection from being 0 or the very little short circuit current becoming short dot originally; this dead-zone fault becomes troubles inside the sample space from external area error just to make transformer differential protection judge; transformer differential protection is with regard to the trip(ping) circuit of action launching transformer general export; other circuit breakers of saltus step depressor, have excised this fault.
3, the quick cutting method of step down side dead-zone fault
(1) 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.TA when the low-pressure side TA(that step down side circuit breaker 3QF and transformer differential protection use and low-pressure side circuit breaker place) between when there is phase fault or earth fault (during grounded system via resistance), this fault is outside transformer longitudinal linked differential protection scope, but within the protection range of low-voltage bus bar differential protection, low-voltage bus bar differential protection starts all switches of this fault bus of tripping (containing step down side circuit breaker 3QF); Or step down side backup protection starts tripping step down side circuit breaker 3QF.Although circuit breaker 3QF tripping at open position; but fault is not excised; when fault phase has short circuit current to exceed setting value or negative-sequence current exceedes setting value or zero-sequence current exceedes setting value (during grounded system via resistance); then thus judge dead-zone fault two conditions meet; after time delay 150ms; exit transformer low voltage side transformer differential TA, namely step down side electric current does not participate in transformer differential protection Current calculation.Because fault side electric current is exited transformer differential protection Current calculation by transformer differential protection; this dead-zone fault has become troubles inside the sample space from external area error just to make transformer differential protection judge; transformer differential protection is with regard to the trip(ping) circuit of action launching transformer general export; other circuit breakers of saltus step depressor, have excised this fault.
(2) when step down side circuit breaker 3QF, at open position, above-mentioned low-pressure side dead-zone fault occurs, this fault is outside transformer longitudinal linked differential protection scope, but within the protection range of low-voltage bus bar differential protection, low-voltage bus bar differential protection starts all switches of this fault bus of tripping, or the step down side backup protection start-up study time is to action; Although circuit breaker 3QF is at open position; but fault phase has short circuit current to exceed setting value or negative-sequence current exceedes setting value or zero-sequence current exceedes setting value (during grounded system via resistance); then thus judge dead-zone fault two conditions meet; after time delay 150ms; exit transformer low voltage side transformer differential TA, namely step down side electric current does not participate in transformer differential protection Current calculation.Because fault side electric current is exited transformer differential protection Current calculation by transformer differential protection; this dead-zone fault has become troubles inside the sample space from external area error just to make transformer differential protection judge; transformer differential protection is with regard to the trip(ping) circuit of action launching transformer general export; other circuit breakers of saltus step depressor, have excised this fault.
4, the quick cutting method of other failure in transformer dead zone
Transformer side electric pressure be 35kV and following system time, this system is generally isolated neutral system or compensated distribution network or grounded system via resistance, then the quick cutting method of this side dead-zone fault of transformer can refer to the quick cutting method of 220kV step down side dead-zone fault.
Transformer side electric pressure be 220kV and above system time this system be generally effectively earthed system, then the quick cutting method of this side dead-zone fault of transformer can refer to the quick cutting method of 220kV high voltage side of transformer dead-zone fault.
When transformer is two-winding transformer, is equivalent to above-mentioned three-winding transformer and has lacked side, only need consider that dead-zone fault quick cutting method in transformer both sides is just passable.

Claims (1)

1. the relay protecting method that excises fast of failure in transformer dead zone, is characterized in that: in the tripping operation of transformer side dead-zone fault controls, set following condition,
Condition one, this side circuit breaker of transformer is in open position;
Condition two, this side of transformer A phase current or B phase current or C phase current exceed setting value, or zero-sequence current exceedes setting value or negative-sequence current exceedes setting value;
When above-mentioned condition all meets, time delay this side transformer differential of definite value backed off after random transformer protection TA, namely this side electric current of transformer does not participate in transformer differential protection Current calculation; When above-mentioned arbitrary condition does not meet, access this side transformer differential of transformer TA immediately, namely this side electric current of transformer participates in transformer differential protection Current calculation.
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CN103683200A (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 and sealed current transformers TA
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
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
CN106602514B (en) * 2017-01-18 2019-01-08 北京四方继保自动化股份有限公司 A kind of substation areas of transformer station dead zone protection system shared based on station domain information

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CN103001196A (en) * 2012-11-13 2013-03-27 江苏省电力公司镇江供电公司 Relay production method for cutting transformer dead zone faults

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CN103001195A (en) * 2012-11-13 2013-03-27 江苏省电力公司镇江供电公司 Relay protection method capable of quickly removing dead zone fault of transformer
CN103001196A (en) * 2012-11-13 2013-03-27 江苏省电力公司镇江供电公司 Relay production method for cutting transformer dead zone faults

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