CN103001195B - The relay protecting method of failure in transformer dead zone and the circuit breaker tripping of fault side - Google Patents
The relay protecting method of failure in transformer dead zone and the circuit breaker tripping of fault side Download PDFInfo
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Abstract
The present invention relates to the relay protection and control method that 220kV electric substation excises failure in transformer dead zone and the circuit breaker tripping of transformer fault side fast.The method is in the tripping operation of transformer side dead-zone fault controls, and set following condition: condition one, this rear flank of transformer is in operate condition for trip protection exit relay 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 condition all meets, time delay this side transformer differential of definite value backed off after random transformer protection TA, excises this fault by other side circuit breakers of transformer differential protection action tripping transformer; When above-mentioned arbitrary condition does not meet, access this side transformer differential of transformer TA immediately.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
Technical field
The invention belongs to power transmission and distribution network-based control technology, relate to a kind of relay protection and control method that 220kV electric substation excises failure in transformer dead zone and the circuit breaker tripping of transformer fault side 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 Fig. 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 relay circuit 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 this 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.The power transformation proposing to adopt another one logical circuit to complete the transmission and distribution networks that adaptation is applied is done the protection equipment for transformer of various electric pressure the Protection Technology scheme of the various electric pressure dead-zone fault in the excision each side of transformer fast by the present invention.
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, and operating principle is simple, reliability is high, the relay protecting method of the various electric pressure dead-zone fault in the quick each side of excision transformer and transformer breaker miss operation.
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; the TA used is that (such as differential protection uses circuit breaker place TA to different 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 and transformer breaker miss operation controls, set following condition:
Condition one, this rear flank of transformer is in operate condition for trip protection exit relay or other electric parameters protection (such as this side bus differential protection) exit relay that trips 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 condition all meets, time delay this side transformer differential of t1 definite value (as 150ms) 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 action launching transformer differential exit relay; other circuit breakers of tripping transformer, have excised this fault.
220kV electric substation of the present invention excises the relay protection and control method of failure in transformer dead zone and the circuit breaker tripping of transformer fault side fast, and compared with the method for existing excision failure in transformer dead zone, 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 time delay very short time (as 150ms) is with regard to quick starting transformer differential protection, reaches the object of this dead-zone fault of excision fast;
3. owing to not adding breaker open operation position contact in criterion; for electric substation's side bus fault; bus protection action or transformer fault rear flank are for protection act; but transformer fault side circuit breaker miss operation (breaker failure); the present invention program also time delay one can definite time-lag (as 150ms) backed off after random transformer fault side transformer differential TA after judging circuit breaker tripping; starting transformer differential protection, fast this fault of excision.
Accompanying drawing explanation
Fig. 1 is that in the inventive method embodiment, this side transformer differential TA logic diagram is exited in dead-zone fault startup in transformer side;
Fig. 2 is existing 220kV electric substation part primary connection circuit figure.
In Fig. 1, symbol description is as follows:
-presentation logic and relation, when namely initial conditions all meets, export effectively;
-presentation logic or relation, namely initial conditions is arbitrary when meeting, and exports effectively;
when-expression condition all meets, the time delay t1 time exports effectively; Condition is arbitrary to be returned when not meeting immediately.
Embodiment
For the 220kV autotransformer protection of 220kV electric substation; 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, 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 as shown in Figure 2, 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 etc. by bus bar side respectively to transformer side.
Judge that this side of transformer A phase or B phase or C phase also have electric current, this side of transformer differential protection TA electric current can be gathered, current ration can be set to (0.5-1) times high voltage side of transformer rated current; When this side of transformer is effectively earthed system, zero-sequence current or negative-sequence current definite value can be adjusted as 120A-180A.
When transformer side electric pressure be 35kV and following system time, this system is generally isolated neutral system or compensated distribution network, then this side zero sequence current criterion of transformer can.If resistance grounded system, then this side zero sequence current criterion of transformer can use.
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) when there is phase fault or earth fault between the high-pressure side TA that high voltage side of transformer circuit breaker lQF and transformer differential protection use (i.e. the TA at high-pressure side circuit breaker place); 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).If there is power supply other side of transformer, although circuit breaker 1QF tripping, but fault is not excised, fault phase still has electric current or zero-sequence current or negative-sequence current to exceed setting value, therefore first set 220kV bus differential protecting, second cover 220kV bus differential protecting still action does not return (or the high voltage side of transformer backup protection start-up study time does not return to backup protection still action), therefore judge that two conditions of dead-zone fault meet, after (as 150ms) is definited time-lag in time delay one, 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 action launching transformer differential exit relay; other circuit breakers of saltus step depressor, have excised this fault.
(2) when high voltage side of transformer circuit breaker lQF at open position, above-mentioned high voltage side of transformer dead-zone fault occurs; 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 there is power supply other side of transformer; although circuit breaker 1QF is at open position; but fault phase has short circuit current or zero-sequence current or negative-sequence current to exceed 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-up study time are to action; therefore judge that two conditions of dead-zone fault meet; after (as 150ms) is definited time-lag in time delay one; 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 action launching transformer differential exit relay; other circuit breakers of saltus step depressor, have excised this fault.
(3) if 220kV busbar fault, although two cover 220kV bus differential protecting actions, two cover 220kV bus differential protectings start other all switch of this fault bus of tripping, but high voltage side of transformer circuit breaker lQF miss operation, if there is power supply other side of transformer, then fault is not excised, fault phase still has electric current or zero-sequence current or negative-sequence current to exceed setting value, therefore first set 220kV bus differential protecting, second cover 220kV bus differential protecting still action does not return (or the high voltage side of transformer backup protection start-up study time does not return to backup protection still action), therefore judge that two conditions of dead-zone fault meet, after (as 150ms) is definited time-lag in time delay one, 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 action launching transformer differential exit relay; other circuit breakers of saltus step depressor, have excised this fault.
(4) 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) when there is phase fault or earth fault between the medium voltage side TA that transformer medium voltage side circuit breaker 2QF and transformer differential protection use (i.e. the TA at medium voltage side circuit breaker place), 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), although circuit breaker 2QF tripping, but fault is not excised, fault phase still has electric current or zero-sequence current or negative-sequence current to exceed setting value, therefore 110kV bus differential protecting still action do not return (or the high voltage side of transformer backup protection start-up study time does not return to backup protection still action), then thus judge dead-zone fault two conditions meet, after (as 150ms) is definited time-lag in time delay one, 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 action launching transformer differential exit relay; 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 transformer medium voltage side dead-zone fault occurs; fault is outside transformer longitudinal linked differential protection scope; but within 110kV bus differential protecting protection range, 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 exceed setting value; the action of 110kV bus differential protecting or high voltage side of transformer backup protection start-up study time are to action; therefore judge that two conditions of dead-zone fault meet; after (as 150ms) is definited time-lag in time delay one; 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 action launching transformer differential exit relay; other circuit breakers of saltus step depressor, have excised this fault.
(3) if 110kV busbar fault, although the action of 110kV bus differential protecting, 110kV bus differential protecting starts other all switch of this fault bus of tripping, but transformer medium voltage side circuit breaker 2QF tripping, but fault is not excised, fault phase still has electric current or zero-sequence current or negative-sequence current to exceed setting value, therefore 110kV bus differential protecting still action do not return (or the transformer medium voltage side backup protection start-up study time does not return to backup protection still action), therefore judge that two conditions of dead-zone fault meet, after (as 150ms) is definited time-lag in time delay one, 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 action launching transformer differential exit relay; 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.When there is phase fault or earth fault (during grounded system via resistance) between the low-pressure side TA that step down side circuit breaker 3QF and transformer differential protection use (i.e. the TA at low-pressure side circuit breaker place), 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), although circuit breaker 3QF tripping, but fault is not excised, fault phase still has electric current or negative-sequence current or zero-sequence current to exceed setting value (during grounded system via resistance), therefore low-voltage bus bar differential protection still action do not return that (or step down side backup protection is not (when having bus protection, by a set of low-pressure side backup protection wherein as bus protection) the start-up study time do not return to backup protection still action), then thus judge dead-zone fault two conditions meet, after (as 150ms) is definited time-lag in time delay one, 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 is just made to become troubles inside the sample space from transformer differential protection external area error; transformer differential protection is with regard to action launching transformer differential exit relay; other circuit breakers of saltus step depressor, have excised this fault.
(2) when step down side circuit breaker 3QF above-mentioned low-pressure side dead-zone fault occurs at open position, 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, although circuit breaker 3QF is at open position, but fault phase still has electric current or negative-sequence current or zero-sequence current to exceed setting value (during grounded system via resistance), when the action of low-voltage bus bar differential protection or step down side backup protection be not (when having bus protection, by a set of low-pressure side backup protection wherein as bus protection) action of start-up study time, then thus judge dead-zone fault two conditions meet, after (as 150ms) is definited time-lag in time delay one, 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 is just made to become troubles inside the sample space from transformer differential protection external area error; transformer differential protection is with regard to action launching transformer differential exit relay; other circuit breakers of saltus step depressor, have excised this fault.
(3) if low-voltage bus bar fault, although the action of low-voltage bus bar differential protection, low-voltage bus bar differential protection starts other all switch of this fault bus of tripping, but step down side circuit breaker 3QF tripping, so fault is not excised, fault phase still has electric current or negative-sequence current to exceed setting value, low-voltage bus bar differential protection still action does not return (or the step down side backup protection start-up study time does not return to backup protection still action), then judge that two conditions of dead-zone fault meet, after (as 150ms) is definited time-lag in time delay one, 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 is just made to become troubles inside the sample space from transformer differential protection external area error; transformer differential protection is with regard to action launching transformer differential exit relay; 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.When transformer side electric pressure You Liangge branch, can consider that two quick cutting methods of dead-zone fault are just passable respectively.
Claims (5)
1. a relay protecting method for failure in transformer dead zone and the circuit breaker tripping of fault side, is characterized in that the method comprises following rate-determining steps:
Step 1, Starting mode, namely in the tripping operation of transformer side dead-zone fault and transformer breaker miss operation controls, sets following condition
Condition one, this rear flank of transformer is in operate condition for trip protection exit relay 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;
Step 2, wavy trajectory, namely when the full terms of above-mentioned Starting mode meets, time delay t1 definite value backed off after random transformer fault side transformer differential protection TA, namely transformer fault 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 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 action launching transformer differential exit relay, other side circuit breakers of tripping transformer, have excised this fault; When arbitrary condition of above-mentioned Starting mode does not meet, access transformer fault side transformer differential TA immediately, namely transformer fault side electric current participates in transformer differential protection Current calculation.
2. the relay protecting method of failure in transformer dead zone according to claim 1 and the circuit breaker tripping of fault side, it is characterized in that: the method contains two-winding transformer, three-winding transformer, the technical scheme of the isallobaric device dead-zone fault protection of autotransformer and the protection of transformer breaker miss operation, and the high-pressure side of 220kV electric pressure electric substation transformer excises the relay protection and control method of failure in transformer dead zone and high voltage side of transformer circuit breaker miss operation fast, medium voltage side excises the relay protection and control method of failure in transformer dead zone and transformer medium voltage side circuit breaker miss operation fast, low-pressure side excises the relay protection and control method of failure in transformer dead zone and step down side circuit breaker miss operation fast.
3. the relay protecting method of failure in transformer dead zone according to claim 1 and the circuit breaker tripping of fault side, is characterized in that: the t1 definite value of time delay one described in step 2 is 150ms.
4. the relay protecting method of failure in transformer dead zone according to claim 1 and the circuit breaker tripping of fault side, it is characterized in that: judge that the collection of the A phase current of high voltage side of transformer or transformer medium voltage side or step down side, B phase current, C phase current is as gathering this side of transformer differential protection TA electric current, this current ration is adjusted as this side rated current of (0.5-1) times transformer; Negative-sequence current fixed value adjusting is 120A-180A; When this side of transformer is effectively earthed system, zero-sequence current fixed value adjusting is 120A-180A.
5. the relay protecting method of failure in transformer dead zone according to claim 1 and the circuit breaker tripping of fault side, is characterized in that: the method for short circuit malfunction be one of following:
1) the high voltage side of transformer dead-zone fault occurred when electric substation normally runs or medium voltage side dead-zone fault or low-pressure side dead-zone fault;
2) transformer normally runs, but the low-pressure side dead-zone fault occurred when the medium voltage side dead-zone fault occurred when the high-pressure side dead-zone fault occurred when high-pressure side circuit breaker disconnects or medium voltage side circuit breaker disconnect or low-pressure side circuit breaker disconnect;
3) high-voltage side bus short trouble when electric substation normally runs, high-pressure side bus bar differential prptection operation jumps high voltage side of transformer circuit breaker, but high voltage side of transformer circuit breaker miss operation; Or electric substation's medium voltage side busbar short-circuit fault when normally running, medium voltage side bus bar differential prptection operation saltus step depressor medium voltage side circuit breaker, but transformer medium voltage side circuit breaker miss operation; Or electric substation's low-pressure side bus short trouble when normally running, step down side circuit breaker is jumped in low-pressure side bus protection or step down side backup protection action, but step down side circuit breaker miss operation.
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| 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 |
| 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 |
| CN103618290B (en) * | 2013-12-03 | 2016-08-17 | 国家电网公司 | Based on open and protection in short-term and the transformer dead-zone fault relay protection method of envelope TA |
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