CN103762553A - Relay protection method for accelerated removal of dead zone faults of transformer based on open positions of circuit breakers - Google Patents
Relay protection method for accelerated removal of dead zone faults of transformer based on open positions of circuit breakers Download PDFInfo
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Abstract
The invention relates to a relay protection method for accelerated removal of dead zone faults of a transformer based on the open positions of circuit breakers. According to the method, in trip control of the dead zone faults of one side of the transformer, the following conditions are set, firstly, a spare trip protection outlet relay on the side of the transformer is in an action state or other electrical capacity trip protection outlet relays are in an action state; secondly, the A phase current or the B phase current or the C phase current of the side of the transformer reaches a starting value, or the zero-sequence current Io or the negative-sequence current I2 reaches the starting value; if both the conditions are met, a transformer differential trip protection main outlet loop is started after delay, and the circuit breakers on the sides for tripping off the transformer are started; if no condition is met, 0s is returned, and the transformer differential trip protection main outlet loop is disconnected. The relay protection method is simple in action principle, high in reliability, and capable of quickly removing the dead zone faults with different voltage classes and on all sides of the transformer.
Description
Technical field
The invention belongs to the control technology of power transmission and distribution network, relate to a kind of failure in transformer dead zone relay protecting method that accelerates excision based on breaker open operation position.
Background technology
GB/T14285-2006 < < relaying protection and automatic safety device technical regulation > > regulation; transformer should be installed longitudinal differential protection and cause as main protection and reaction outside phase fault and ground short circuit the electric parameters protection such as backup protection of transformer overcurrent; 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 in the each side of transformer, all install the backup protection of the outside phase fault of reaction and ground short circuit.220kV and above tranformer protection configuring condition have concrete regulation in Q/GDW_175 < < 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 110kV neutral point is general when earth-free, configured 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, configured zero-sequence current protection use, 110kV neutral point gap relay is stopped using).
So-called failure in transformer dead zone means the short trouble (see figure 2) occurring between the circuit breaker of a certain side of transformer and the current transformer (hereinafter to be referred as TA) of 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 (as bus protection) action, this side circuit breaker of tripping transformer, but fault still exists, only have by transformer frequency response side backup protection action or adopt the final excision of this side backup protection action connection saltus step depressor general export loop tripping transformer frequency response side circuit breaker ability fault, this kind of situation excision is generally longer 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, only having by the time transformer to burn to make short circuit current to meet and exceed this backup protection startup value can make in application for a patent for invention 201210453319.0 " relay protecting method of excision failure in transformer dead zone ", to have proposed till transformer frequency response side backup protection action excision fault one and judge starting transformer transformer differential protection general export relay circuit after dead-zone fault, go the scheme of other side circuit breakers of saltus step depressor.The present invention improves logical circuit and completes and adapt to the power transformation of applied transmission and distribution networks the do protection equipment for transformer of various electric pressures the Protection Technology scheme of the various electric pressure dead-zone faults of the excision each side of transformer fast proposing one.
Summary of the invention
Problem to be solved by this invention is; providing one can be applied to transmission and distribution networks is various electric pressure electric substation protection equipment for transformer, and operating principle is simple, reliability is high, excise fast the relay protecting method of the various electric pressure dead-zone faults of the each side of transformer.
Provide the technical scheme of the inventive method below.
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 pass through breaker interval equipment (by isolating switch, circuit breaker, the equipment compositions such as current transformer) be connected with external circuit equipment, just there is several failure in transformer dead zone position, there are 2 working voltage grades to be connected with external circuit equipment by breaker interval equipment, as long as a certain side circuit breaker of transformer both sides only has this side of transformer to have current transformer (being called for short TA), and bus bar side does not have TA, just there is several failure in transformer dead zone position (if all there is TA circuit breaker both sides, this circuit breaker loop does not just have dead-zone fault position), there are 3 working voltage grades 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, 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, 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 the 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.Bushing shell for transformer place has also installed sleeve pipe TA.The TA that the each side backup protection of 110kV and following transformer is used separates with transformer differential protection, the TA of use be different TA(such as differential protection is used the TA of circuit breaker place, and sleeve pipe TA is used in backup protection), or the different secondary winding of TA.
Its control method has two kinds of technical schemes.
The first scheme comprises following control procedure:
In the tripping operation control of transformer side dead-zone fault, set following condition:
Condition one, exit relay is tripped in operate condition for trip protection exit relay in operate condition or other electric parameters protection (such as this side bus differential protection) in this rear flank of transformer;
Condition two, this side of transformer A phase or B phase or C phase current Ipmax reach startup value, or zero-sequence current Io or negative-sequence current I2 reach startup value, >=setting value;
When above-mentioned condition meets, time delay t1(is as 150ms) rear starting transformer differential protection tripping operation general export loop, start each side circuit breaker of tripping transformer, thereby reach this failure in transformer dead zone of quick excision; When above-mentioned arbitrary condition does not meet, 0s returns, and disconnects starting transformer differential protection tripping operation general export loop.
First scheme comprises following control procedure:
In the tripping operation control of transformer side dead-zone fault, set following condition:
Condition one, exit relay is tripped in operate condition for trip protection exit relay in operate condition or other protections (such as this side bus differential protection) in this rear flank of transformer;
Condition two, this side of transformer A phase or B phase or C phase current Ipmax reach startup value, or zero-sequence current Io or negative-sequence current I2 reach startup value, >=setting value;
Condition three, when this side circuit breaker is at open position;
When above-mentioned condition meets, through time delay t2(as 120ms) starting transformer differential protection tripping operation general export loop, start each side circuit breaker of tripping transformer, thereby reach this failure in transformer dead zone of quick excision; When above-mentioned arbitrary condition does not meet, 0s returns, and disconnects starting transformer differential protection tripping operation general export loop.
Judge that this side of transformer A phase or B phase or C also have electric current mutually, can gather this side differential protection of transformer TA electric current, this current ration can be adjusted by escaping this side maximum load current of transformer; When this side of transformer is effectively earthed system, zero-sequence current or negative-sequence current definite value can have enough sensitivity adjust (sensitivity coefficient desirable >=3) by this side bus earth fault of transformer.
When a certain side electric pressure of transformer is 35kV and following system, this system is generally isolated neutral system or compensated distribution network, and this side zero-sequence current criterion of transformer can.If resistance grounded system, this side zero-sequence current criterion of transformer can be used.
Compared with the method for the present invention and existing excision failure in transformer dead zone, tool has the following advantages:
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 judges and just adopts after time delay 150ms directly starting transformer differential protection tripping operation general export loop after dead-zone fault, starts each side circuit breaker of tripping transformer, and criterion is simple and practical, has reached the object of quick this dead-zone fault of excision;
3. owing to not adding breaker open operation position contact in criterion one; for electric substation's side bus fault; bus protection action or transformer fault side backup protection action; but transformer fault side circuit breaker miss operation (breaker failure); the present invention program also can just judge after circuit breaker tripping after time delay directly starting transformer differential protection tripping operation general export loop; start each side circuit breaker of tripping transformer, thereby excise fast this fault.
4. owing to adding breaker open operation position contact in criterion two, can on the basis of criterion one, accelerate the excision of failure in transformer dead zone because t2 than t1 few the circuit breaker mechanism action time.
Accompanying drawing explanation
Fig. 1 is that this side transformer differential of transformer TA logic diagram is exited in a certain side dead-zone fault startup of the transformer of the inventive method embodiment;
Fig. 2 is main wiring diagram of existing 220kV electric substation's part.
In Fig. 1, symbol description is as follows:
-representing that initial conditions meets 120 milliseconds of time delays, initial conditions does not meet and returns for 0 second.
Embodiment
Take 220kV autotransformer of 220kV electric substation, protect 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 the 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 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 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.The each side TA of 220kV transformer configures 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, (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 the 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 < < transformer, the tranformer protection of high-voltage shunt reactor and bus protection and servicing unit standardized designs standard > > design does not arrange special breaker failure current circuit, by bus differential protecting, realized, 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.
Providing the inventive method is below applied to failure in transformer dead zone and excises fast the embodiment of this fault:
1, the quick cutting method of high voltage side of transformer dead-zone fault
(1) as the TA at the circuit breaker place, TA(Ji high-pressure side, high-pressure side that high voltage side of transformer circuit breaker lQF and transformer differential protection are used) between while 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).If other side of transformer has power supply, 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, the second cover 220kV bus differential protecting still moves and does not return to (or high voltage side of transformer backup protection startup delay time still moves and do not return to backup protection), therefore judge that two conditions of dead-zone fault meet, after time delay t1 is 150ms, or high-pressure side circuit breaker lQF is at open position, therefore judge that three conditions of dead-zone fault meet, after time delay t2 is 120ms, starting transformer differential protection tripping operation general export loop, start each side circuit breaker of tripping transformer, 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 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 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 delay time to action, therefore judge that two conditions of dead-zone fault meet, after time delay t1 is 150ms, or high-pressure side circuit breaker lQF is at open position, therefore judge that three conditions of dead-zone fault meet, after time delay t2 is 120ms, starting transformer differential protection tripping operation general export loop, start each side circuit breaker of tripping transformer, 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 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, 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, the second cover 220kV bus differential protecting still moves and does not return to (or high voltage side of transformer backup protection startup delay time still moves and do not return to backup protection), therefore judge that two conditions of dead-zone fault meet, after time delay t1 is 150ms, starting transformer differential protection tripping operation general export loop, 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; transformer fault side does not have fault current to flow through; therefore judge that two conditions of dead-zone fault do not meet, just can not start each side circuit breaker of starting transformer differential protection tripping operation general export loop saltus step depressor.
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 are used is the TA at medium voltage side circuit breaker place) between press while there is phase fault or earth fault between side circuit breaker 2QF and pressure side circuit breaker TA when transformer, 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 moves and does not return to (or high voltage side of transformer backup protection startup delay time still moves and do not return to backup protection), therefore judge that two conditions of dead-zone fault meet, after time delay t1 is 150ms, or medium voltage side circuit breaker 2QF is at open position, therefore judge that three conditions of dead-zone fault meet, after time delay t2 is 120ms, starting transformer differential protection tripping operation general export loop, start each side circuit breaker of tripping transformer, 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 delay time to action; therefore judge that two conditions of dead-zone fault meet; after time delay 150ms; or medium voltage side circuit breaker 2QF is at open position; therefore judge that three conditions of dead-zone fault meet; after time delay t2 is 120ms; starting transformer differential protection tripping operation general export loop; the each side circuit breaker that starts tripping transformer, has excised this fault.
(3) if 110kV busbar fault, although 110kV bus differential protecting action, 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 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 moves and does not return to (or transformer medium voltage side backup protection startup delay time still moves and do not return to backup protection), therefore judge that two conditions of dead-zone fault meet, after time delay t1 is 150ms, starting transformer differential protection tripping operation general export loop, start each side circuit breaker of tripping transformer, 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; this system is generally isolated neutral system or compensated distribution network or grounded system via resistance; generally do not install special bus differential protecting, by a set of step down side backup protection wherein, as bus, protected.When the low-pressure side TA(that step down side circuit breaker 3QF and transformer differential protection are used is the TA at low-pressure side circuit breaker place) between while there is phase fault or earth fault (during grounded system via resistance); fault is outside transformer longitudinal linked differential protection scope; but within the protection range of step down side backup protection, step down side backup protection starts tripping 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 moves and does not return to that (or step down side backup protection is not (when there is no bus protection, by a set of low-pressure side backup protection wherein as bus protection) start delay time and still move and do not return to backup protection), therefore judge that two conditions of dead-zone fault meet, after time delay t1 is 150ms, or low-pressure side circuit breaker 3QF is at open position, therefore judge that three conditions of dead-zone fault meet, after time delay t2 is 120ms, starting transformer differential protection tripping operation general export loop, start each side circuit breaker of tripping transformer, excised this fault.
(2) when step down side circuit breaker 3QF is when above-mentioned low-pressure side dead-zone fault occurs open position, fault is outside transformer longitudinal linked differential protection scope, but within the protection range of step down side backup protection, step down side backup protection starts, 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 low-voltage bus bar differential protection action or step down side backup protection be not (when there is no bus protection, by a set of low-pressure side backup protection wherein as bus protection) start delay time action, therefore judge that two conditions of dead-zone fault meet, after time delay t1 is 150ms, or low-pressure side circuit breaker 3QF is at open position, therefore judge that three conditions of dead-zone fault meet, after time delay t2 is 120ms, starting transformer differential protection tripping operation general export loop, start each side circuit breaker of tripping transformer, excised this fault.
(3) if low-voltage bus bar fault, although step down side backup protection action, but step down side circuit breaker 2QF 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 moves and does not return to (or step down side backup protection startup delay time still moves and do not return to backup protection), therefore judge that two conditions of dead-zone fault meet, after time delay t1 is 150ms, starting transformer differential protection tripping operation general export loop, 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 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.
When a certain side electric pressure of transformer is 110kV or 220kV and above system, this system is generally effectively earthed system, and the quick cutting method of this side dead-zone fault of transformer can be with reference to 220kV high voltage side of transformer or the quick cutting method of medium voltage side 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 dead-zone fault quick cutting method in transformer both sides is just passable.
Claims (2)
1. a failure in transformer dead zone relay protecting method that accelerates excision based on breaker open operation position, is characterized in that:
in the tripping operation control of transformer side dead-zone fault, set following condition,
condition one, this rear flank of transformer for trip protection exit relay in operate condition or other electric parameters trip protection exit relays in operate condition;
condition two, this side of transformer A phase or B phase or C phase current Ipmax reach startup value, or zero-sequence current Io or negative-sequence current I
2
reach startup value,>=setting value;
when above-mentioned condition meets, starting transformer differential protection tripping operation general export loop after time delay t1, each side circuit breaker of startup tripping transformer; When above-mentioned arbitrary condition does not meet, 0s returns, and disconnects starting transformer differential protection tripping operation general export loop.
2. a failure in transformer dead zone relay protecting method that accelerates excision based on breaker open operation position, is characterized in that:
in the tripping operation control of transformer side dead-zone fault, set following condition:
condition one, this rear flank of transformer for trip protection exit relay in operate condition or other trip protection exit relays in operate condition;
condition two, this side of transformer A phase or B phase or C phase current Ipmax reach startup value, or zero-sequence current Io or negative-sequence current I
2
reach startup value,>=setting value;
condition three, when this side circuit breaker is at open position;
when above-mentioned condition meets, through time delay t2 starting transformer differential protection tripping operation general export loop, start each side circuit breaker of tripping transformer; When above-mentioned arbitrary condition does not meet, 0s returns, and disconnects starting transformer differential protection tripping operation general export loop.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104953705A (en) * | 2015-07-15 | 2015-09-30 | 江苏省电力公司镇江供电公司 | Inner bridge spare power automatic switching control method based on incomplete primary main wiring |
| CN106786426A (en) * | 2017-01-17 | 2017-05-31 | 北京四方继保自动化股份有限公司 | The comprehensive distinguishing method of one Ge Ban main electrical schemes transformer station dead-zone fault |
| CN113725826A (en) * | 2021-04-19 | 2021-11-30 | 保定钰鑫电气科技有限公司 | Fault processing method for interphase short circuit |
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| CN101557101A (en) * | 2008-10-14 | 2009-10-14 | 吴宏斌 | Relay protection method for eliminating failure in transformer dead zone |
| 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 |
| CN103280782A (en) * | 2013-05-08 | 2013-09-04 | 国家电网公司 | Relay protection method for clearing dead zone fault of transformer |
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| US4204237A (en) * | 1978-11-30 | 1980-05-20 | Gould Inc. | Solid state transformer differential relay |
| CN101557101A (en) * | 2008-10-14 | 2009-10-14 | 吴宏斌 | Relay protection method for eliminating failure in transformer dead zone |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104953705A (en) * | 2015-07-15 | 2015-09-30 | 江苏省电力公司镇江供电公司 | Inner bridge spare power automatic switching control method based on incomplete primary main wiring |
| CN106786426A (en) * | 2017-01-17 | 2017-05-31 | 北京四方继保自动化股份有限公司 | The comprehensive distinguishing method of one Ge Ban main electrical schemes transformer station dead-zone fault |
| CN106786426B (en) * | 2017-01-17 | 2019-03-05 | 北京四方继保自动化股份有限公司 | The comprehensive distinguishing method of one Ge Ban main electrical scheme substation dead-zone fault |
| CN113725826A (en) * | 2021-04-19 | 2021-11-30 | 保定钰鑫电气科技有限公司 | Fault processing method for interphase short circuit |
| CN113725826B (en) * | 2021-04-19 | 2023-12-05 | 保定钰鑫电气科技有限公司 | Fault processing method for interphase short circuit |
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