CN103606890B - Relay protection method fast removing transformer dead zone fault - Google Patents
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Abstract
The invention relates to a relay protection method fast removing a transformer dead zone fault. According to the method, in the tripping control of the dead zone fault of a certain side of a transformer, the following conditions are set, firstly, a backup protection tripping exit relay of the side of the transformer is in an action state or other electrical quantity protection tripping exit relays are in an action state; secondly, when the first condition is met, a one-time pulse T time open protection is started; thirdly, the A-phase currents or the B-phase currents or the C-phase currents of the side of the transformer reach a starting value, or zero-sequence currents Io or negative-sequence currents I2 reach the starting value, when the above conditions are met, a transformer differential protection tripping main exit loop is started after delay, and the breaker of each side of the tripping transformer is started, and when any above condition is not met or after the open protection meets time T, 0s returning is carried out, and the transformer differential protection tripping main exit loop is open and started. The method is simple in action principle and high in reliability, and the dead zone faults of various voltage classes of all the sides of the transformer can be cleared away fast.
Description
Technical field
The invention belongs to power transmission and distribution network-based control technology, relate to a kind of failure in transformer dead zone accelerating excision
Relay protecting method.
Background technology
GB/T14285-2006 " relay protection and automatic safety device technical regulation " specifies, transformator should be installed
After longitudinal differential protection causes transformator overcurrent as the outside phase fault of main protection and reaction and ground short circuit
The electric parameters protections such as standby protection, wherein reacting the back-up protection of phase fault has composite voltage overcurrent protection, alternate
Impedance protection, the back-up protection of reaction ground short circuit has zero-sequence current protection, impedance ground to protect.These standby is protected
Mulch is different with each side electric pressure according to the transformator of different electric pressures, installs different back-up protections, and one
As all install the outside phase fault of reaction and the back-up protection of ground short circuit in each side of transformator.220kV and above change
Depressor relaying configuration situation is at Q/GDW_175 " transformator, high-voltage shunt reactor and bus protection and auxiliary dress
Put standardized designs specification " there is concrete regulation；110kV and the configuration of following tranformer protection mainly install two in each side
The composite voltage overcurrent protection of Duan Fanying phase fault (if 110kV neutral point general earth-free time, then be configured with
Zero-sequence current protection the most typically need not, only use 110kV neutral point gap relay；If 110kV neutral point typically connects
During ground, being then configured with zero-sequence current protection and use, 110kV neutral point gap relay disables).
So-called failure in transformer dead zone means that the chopper occurred in transformator side is protected with this side transformer differential
Protect the short trouble (see figure 2) between the current transformer (hereinafter referred to as TA) of use.Owing to this fault is becoming
Outside depressor longitudinal differential protection protection domain, although the back-up protection of fault side or other protection (such as bus protection)
Action, this side chopper of tripping transformator, but fault yet suffers from, and only moves by the back-up protection of transformer frequency response side
Make or use this rear flank for protection act connection saltus step depressor general export loop tripping transformer frequency response side chopper ability
Finally excising fault, this kind of situation excision is the longest for fault time；If transformator is high-impedance transformer, transformation
Device mains side back-up protection be likely to be due to short circuit current do not reach startup definite value and akinesia excision fault, only etc.
Burn to transformator and make short circuit current meet and exceed this back-up protection initiation value can to make transformer frequency response rear flank
Till standby protection act excision fault, patent of invention 201210453319.0 " protect by the relay of excision failure in transformer dead zone
Maintaining method " in propose one judge dead-zone fault after starting transformer transformer differential protection general export's relay return
Road, goes the scheme of other side choppers of saltus step depressor.Proposition one improvement logic circuit is completed to adapt to by the present invention
The power transformation of the transmission and distribution networks applied is done the protection equipment for transformer of various electric pressure quickly excise transformation
The Protection Technology scheme of each side of device various electric pressure dead-zone fault.
Summary of the invention
Problem to be solved by this invention be to provide one can be applied to transmission and distribution networks be various electric pressure become
Electricity institute protection equipment for transformer, operating principle is simple, reliability is high, various voltages in the quick each side of excision transformator etc.
The relay protecting method of level dead-zone fault.
The technical scheme of the inventive method is given below.
The power transformation of the transmission and distribution networks applied in the method for the present invention is done two winding transformations of various electric pressure
The protection device of device, three-winding transformer, autotransformer or other transformators；In theory, transformator has several
Individual working voltage grade passes through breaker interval equipment (by equipment groups such as disconnecting switch, chopper, current transformers
Become) it is connected with external circuit equipment, just there is several failure in transformer dead zone position, i.e. have 2 working voltage grades to lead to
Cross breaker interval equipment to be connected with external circuit equipment, if chopper both sides, transformator side only have transformator this
There is current transformer (be called for short TA) side, and bus bar side does not has TA, just have several failure in transformer dead zone position (if
All there is TA chopper both sides, then this chopper loop does not just have dead-zone fault position)；There are 3 working voltage grades
It is connected with external circuit equipment by breaker interval equipment, the most at least (1,3 failure in transformer dead zone positions
If working voltage grade has 2 breaker interval equipment, then this working voltage grade side is 2 transformer dead zones events
Barrier position).
For sake of convenience, the breaker interval equipment generation transformator with one of them working voltage grade of transformator is dead
District's fault, describes and quickly starts the method excising this fault, the transformator of other electric pressure and transformator
For two-winding transformer, three-winding transformer, autotransformer or other transformators, or each side of transformator is by other
The combination of electric pressure, its method is similar to, and is no longer tired of and states.This breaker interval equipment by disconnecting switch, chopper,
The equipment compositions such as TA, TA has several groups of Secondary Winding respectively, and these several groups of Secondary Winding are divided from the lateral transformer side of bus
Do not access the secondary devices such as transformer differential protection (back-up protection), bus differential protecting, measuring.Transformation
Sleeve pipe TA has also been installed at device sleeve pipe.The TA that 110kV and the back-up protection of following transformator each side use is and transformation
Device differential protection is separate, and the TA of use is that different TA(such as differential protection uses TA at chopper, then
Standby protection uses sleeve pipe TA), or the different Secondary Winding of TA.
Its control method has two kinds of technical schemes.
The first scheme includes following control process:
In the tripping operation of transformator side dead-zone fault controls, set following condition:
Condition one, this rear flank of transformator is in operating state or the protection of other electric parameters for trip protection exit relay
(such as this side bus differential protection) tripping operation exit relay is in operating state；
Condition two, when condition one meets, starts pulsatile once T time open and protection (i.e. during open and protection T
Between；The desirable 300ms of T, lower same)；
Condition three, this side of transformator A phase or B phase or C phase current Ipmax reach initiation value, or zero-sequence current Io
Or negative-sequence current I2Reach initiation value, i.e. >=setting valve；
When above-mentioned condition meets, time delay t1(such as 150ms) afterwards starting transformer differential protection tripping operation general export return
Road, starts each side chopper of tripping transformator, thus reaches quickly to excise this failure in transformer dead zone；When upper
State when either condition is unsatisfactory for or after the full time T of open and protection, 0s returns, disconnect starting transformer differential protection and jump
Lock general export loop.
First scheme includes following control process:
In the tripping operation of transformator side dead-zone fault controls, set following condition:
Condition one, this rear flank of transformator is in operating state for trip protection exit relay or other are protected (such as
This side bus differential protection) tripping operation exit relay be in operating state；
Condition two, when condition one meets, starts pulsatile once T time open and protection (an open and protection T time)；
Condition three, this side of transformator A phase or B phase or C phase current Ipmax reach initiation value, or zero-sequence current Io
Or negative-sequence current I2Reach initiation value, i.e. >=setting valve；
Condition four, when this side chopper is at open position；
When above-mentioned condition meets, the time delay t2(such as 120ms through necessary) tripping operation of starting transformer differential protection is always
Outlet loop, starts each side chopper of tripping transformator, thus reaches quickly to excise this failure in transformer dead zone；
When any of the above-described condition is unsatisfactory for or after the full time T of open and protection, 0s returns, the disconnection differential guarantor of starting transformer
Protect tripping operation general export loop.
Judge that this side of transformator A phase or B phase or C phase also have electric current, this side of transformator differential protection TA can be gathered
Electric current, this current ration can be adjusted by escaping this side maximum load current of transformator；When this side of transformator is for effectively to connect
During ground system, zero-sequence current or negative-sequence current definite value can have enough sensitivity by this side bus earth fault of transformator
Adjust (sensitivity coefficient desirable >=3).
When transformator side electric pressure is 35kV and following system, this system be generally isolated neutral system or
Compensated distribution network, then this side zero sequence current criterion of transformator can.If resistance grounded system, then
This side zero sequence current criterion of transformator can use.
The present invention, compared with the method for existing excision failure in transformer dead zone, has the advantage that
1. it is applicable to the power transformation of transmission and distribution networks do the two-winding transformer of various electric pressure, three winding transformation
The technical scheme of device, autotransformer isallobaric device protection device.
2. just directly initiate transformer differential protection tripping operation after using time delay 150ms after the method judges dead-zone fault total
Outlet loop, starts each side chopper of tripping transformator, and criterion is simple and practical, has reached this dead band of quick excision
The purpose of fault；
3. owing to criterion one not adding breaker open operation position contact, for electric substation's side bus fault,
Bus protection action or transformer fault rear flank are for protection act, but transformer fault side chopper miss operation is (disconnected
Road device is malfunctioning), the present invention program also can just directly initiate transformator after judging chopper tripping after time delay 150ms
Differential protection tripping operation general export loop, starts each side chopper of tripping transformator, thus quickly excises this fault.
4., owing to criterion two adding breaker open operation position contact, transformator can be accelerated on the basis of criterion one dead
The excision of district's fault because t2 than t1 few chopper mechanism action time.
5. add the T time loop of short time open and protection, enhance the safety of this failure in transformer dead zone protection
Property.
Accompanying drawing explanation
Fig. 1 is that this side transformer of transformator is exited in the transformator side dead-zone fault startup of the inventive method embodiment
Differential TA logic chart；
Fig. 2 is existing 220kV electric substation part primary connection circuit figure.
In Fig. 1, symbol description is as follows:
-representing logical AND relation, when i.e. initial conditions all meets, output is effectively；
--representing logic or relation, i.e. initial conditions are arbitrary when meeting, output is effectively；
-representing that initial conditions meets time delay 150 milliseconds, initial conditions is unsatisfactory for 0 second returning；
-representing that initial conditions meets time delay 120 milliseconds, initial conditions is unsatisfactory for 0 second returning；
-represent 300ms pulse output.
Detailed description of the invention
As a example by one the 220kV autotransformer protection of 220kV electric substation, failure in transformer dead zone is described quick
Start excise this fault method, the transformator of other electric pressure and transformator be two-winding transformer, three
Winding transformer, autotransformer or other transformators, or each side of transformator is by the combination of other electric pressure, its
Method is similar to, and is no longer tired of and states.As in figure 2 it is shown, be 220kV electric substation part primary connection circuit figure, a 220kV
Autotransformer, transformator is equiped with high-pressure side chopper 1QF, medium voltage side chopper 2QF, low-pressure side chopper
3QF；At the chopper 1QF of high-pressure side, at medium voltage side chopper 2QF, install respectively at low-pressure side chopper 3QF
Having the TA of one group of independence, TA has several groups of Secondary Winding respectively, at high voltage side of transformer, medium voltage side and neutral point also
Install sleeve pipe TA.TA configuration in 220kV transformator each side is as in figure 2 it is shown, wherein high voltage side of transformer (220kV)
At chopper, TA Secondary Winding is connected to first set transformator longitudinal differential and standby respectively by the lateral transformer side of bus
Protection, second set transformator longitudinal differential and back-up protection (220kV tranformer protection typically use main protection and after
The standby protection each side of unified collocation, i.e. main protection and back-up protection public same group of TA Secondary Winding, mutual induction of voltage
Device Secondary Winding, and main protection and back-up protection all hardware equipment and software is in same cabinet), first set
220kV bus differential protecting, the second set 220kV bus differential protecting are (by Q/GDW_175 " transformator, high pressure
Shunt reactor and bus protection and auxiliary device standardized designs specification " tranformer protection that designs is not provided with specially
The breaker failure current loop of door, is realized by bus differential protecting；Otherwise have and special breaker failure electricity is set
Flow back to road), measure, measure；At transformator medium voltage side (110kV) chopper, TA Secondary Winding is lateral by bus
Transformer side be connected to respectively first set transformator longitudinal differential and back-up protection, the second set transformator longitudinal differential and after
Standby protection, 110kV bus differential protecting, measure, measure；Step down side (35kV or 10kV etc.) breaks
At the device of road, TA Secondary Winding is connected to first set transformator longitudinal differential respectively by the lateral transformer side of bus and standby is protected
Protect, the second set transformator longitudinal differential and back-up protection (bus protection), failure wave-recording, measure, measurement etc..
The inventive method is given below be applied to failure in transformer dead zone and quickly excise the embodiment of this fault:
1, the quick cutting method of high voltage side of transformer dead-zone fault
(1) when the high-pressure side TA(i.e. high-pressure side that high voltage side of transformer chopper 1QF uses with transformer differential protection
TA at chopper) between there is phase fault or during earth fault, fault is in transformer longitudinal linked differential protection scope
Outside, but within first set 220kV bus differential protecting, the second set 220kV bus differential protecting protection domain,
First set 220kV bus differential protecting, the second set 220kV bus differential protecting start this fault bus of tripping and own
Switch (containing high voltage side of transformer chopper 1QF).If there is power supply other side of transformator, although chopper 1QF jumps
Opening, but fault is not excised, fault phase still has electric current or zero-sequence current or negative-sequence current to exceed setting valve, therefore first
Set 220kV bus differential protecting, the second set 220kV bus differential protecting still action do not return (or transformator
The high-pressure side back-up protection start-up study time does not return to back-up protection still action), start open and protection 300ms
Loop, therefore judge that three conditions of dead-zone fault meet, after time delay t1 is 150ms, or high-pressure side chopper 1QF
At open position, after time delay t2 is 120ms, starting transformer differential protection tripping operation general export loop, open
Each side chopper of dynamic tripping transformator, has excised this fault.
(2) there is above-mentioned high voltage side of transformer dead-zone fault at open position as high voltage side of transformer chopper 1QF,
Fault outside transformer longitudinal linked differential protection scope, but first set 220kV bus differential protecting, second set
Within 220kV bus differential protecting protection domain, first set 220kV bus differential protecting, the second set 220kV are female
Line differential protection starts the tripping all switches of this fault bus.If there is power supply other side of transformator, although chopper 1QF
At open position, but fault phase has short circuit current or zero-sequence current or negative-sequence current to exceed setting valve, first set
220kV bus differential protecting, the second set 220kV bus differential protecting action or high voltage side of transformer back-up protection are opened
Dynamic delay time, to action, starts open and protection 300ms loop, therefore judges that three conditions of dead-zone fault meet,
After time delay t1 is 150ms, or high-pressure side chopper 1QF is at open position, after time delay t2 is 120ms,
Starting transformer differential protection tripping operation general export loop, starts each side chopper of tripping transformator, has excised this event
Barrier.
(3) if 220kV bus-bar fault, although two set 220kV bus differential protecting actions, two set 220kV are female
Line differential protection starts other all switches of this fault bus of tripping, but high voltage side of transformer chopper 1QF refusal is dynamic
Making, if there is power supply other side of transformator, then fault is not excised, and fault phase still has electric current or zero-sequence current or negative phase-sequence
Electric current exceedes setting valve, therefore first set 220kV bus differential protecting, the second set 220kV bus differential protecting are still
Action do not return (or the high voltage side of transformer back-up protection start-up study time do not return to back-up protection still action
Return), start open and protection 300ms loop, therefore judge that three conditions of dead-zone fault meet, time delay t1 is 150ms
After, starting transformer differential protection tripping operation general export loop, start each side chopper of tripping transformator, excise
This fault.
(4) if this other side of electric substation's transformator does not has power supply, then transformer fault side does not has fault current to flow through,
Therefore judge that two conditions of dead-zone fault are unsatisfactory for, starting transformer differential protection tripping operation general export would not be started and return
Each side chopper of road saltus step depressor.If 220kV bus differential protecting or high voltage side of transformer back-up protection one direct acting
Do not return, then the protection of locking transformer dead zone, concurrent alarm signal after 300ms.
2, the quick cutting method of transformator medium voltage side dead-zone fault
(1) when the medium voltage side TA(i.e. medium voltage side that transformator medium voltage side chopper 2QF uses with transformer differential protection
TA at chopper) between when transformator pressure side chopper 2QF and pressure side chopper TA between occur phase fault
Or during earth fault, fault is outside transformer longitudinal linked differential protection scope, but at 110kV bus differential protecting
Within protection domain, 110kV bus differential protecting starts the tripping all switches of this fault bus and (presses containing in transformator
Side chopper 2QF), although chopper 2QF tripping, but fault is not excised, and fault phase still has electric current or zero sequence
Electric current or negative-sequence current exceed setting valve, therefore the still action of 110kV bus differential protecting does not return (or transformator
The high-pressure side back-up protection start-up study time does not return to back-up protection still action), start open and protection 300ms
Loop, therefore judge that three conditions of dead-zone fault meet, after time delay t1 is 150ms, or medium voltage side chopper 2QF
At open position, after time delay t2 is 120ms, starting transformer differential protection tripping operation general export loop, open
Each side chopper of dynamic tripping transformator, has excised this fault.
(2) there is above-mentioned transformator medium voltage side dead-zone fault at open position as transformator medium voltage side chopper 2QF,
Fault is outside transformer longitudinal linked differential protection scope, but within 110kV bus differential protecting protection domain,
110kV bus differential protecting starts the tripping all switches of this fault bus.Although chopper 2QF is at open position,
But fault phase has short circuit current or zero-sequence current or negative-sequence current to exceed setting valve, 110kV bus differential protecting action
Or the high voltage side of transformer back-up protection start-up study time is to action, therefore judge that two conditions of dead-zone fault meet,
After time delay 150ms, starting transformer differential protection tripping operation general export loop, start each side open circuit of tripping transformator
Device, has excised this fault.
(3) if 110kV bus-bar fault, although 110kV bus differential protecting action, 110kV bus differential protecting
Startup other all switches of this fault bus of tripping, but transformator medium voltage side chopper 2QF tripping, but fault does not has
Excision, fault phase still has electric current or zero-sequence current or negative-sequence current to exceed setting valve, therefore 110kV bus differential protecting
Still action does not return that (or the transformator medium voltage side back-up protection start-up study time does not has to back-up protection still action
Have return), start open and protection 300ms loop, therefore judge that three conditions of dead-zone fault meet, time delay t1 is
After 150ms, starting transformer differential protection tripping operation general export loop, start each side chopper of tripping transformator,
Excise this fault.
(4) if 110kV bus differential protecting or high voltage side of transformer back-up protection one direct acting do not return, then 300ms
Rear locking transformer dead zone is protected, concurrent alarm signal.
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, the most do not install special bus differential protecting, by it
In a set of step down side back-up protection protect as bus.When step down side chopper 3QF and transformator
The TA at low-pressure side TA(i.e. low-pressure side chopper that differential protection uses) between there is phase fault or ground connection therefore
During barrier (during grounded system via resistance), fault is outside transformer longitudinal linked differential protection scope, but low at transformator
Within the protection domain of pressure side back-up protection, step down side back-up protection starts tripping step down side open circuit
Device 3QF.Although chopper 3QF tripping, but fault is not excised, fault phase still have electric current or negative-sequence current or
Zero-sequence current exceedes setting valve (during grounded system via resistance), therefore the still action of low-voltage bus bar differential protection is not returned
Return (or step down side back-up protection is (when not having bus protection, by a set of low-pressure side back-up protection therein
As bus protection) the start-up study time do not returns to back-up protection still action), start open and protection 300ms
Loop, therefore judge that three conditions of dead-zone fault meet, after time delay t1 is 150ms, or low-pressure side chopper 3QF
At open position, after time delay t2 is 120ms, starting transformer differential protection tripping operation general export loop, open
Each side chopper of dynamic tripping transformator, has excised this fault.
(2) when step down side chopper 3QF occurs above-mentioned low-pressure side dead-zone fault at open position, therefore
Hinder outside transformer longitudinal linked differential protection scope, but within the protection domain of step down side back-up protection,
Step down side back-up protection starts；Although chopper 3QF is at open position, but fault phase still have electric current or
Negative-sequence current or zero-sequence current exceed setting valve (during grounded system via resistance), when low-voltage bus bar differential protection action
Or step down side back-up protection is (when not having bus protection, by a set of low-pressure side back-up protection conduct therein
Bus protection) action of start-up study time, start open and protection 300ms loop, therefore judge three of dead-zone fault
Condition meets, and after time delay t1 is 150ms, or low-pressure side chopper 3QF is at open position, and time delay t2 is
After 120ms, starting transformer differential protection tripping operation general export loop, start each side chopper of tripping transformator,
Excise this fault.
(3) if low-voltage bus bar fault, although step down side back-up protection action, but step down side break
Road device 2QF tripping, so fault is not excised, fault phase still has electric current or negative-sequence current to exceed setting valve, low pressure
Bus differential protecting still action do not return (or the step down side back-up protection start-up study time to standby protect
Protect still action not return), start open and protection 300ms loop, therefore judge that three conditions of dead-zone fault are full
Foot, after time delay t1 is 150ms, starting transformer differential protection tripping operation general export loop, start tripping transformator
Each side chopper, excised this fault.
(4) if step down side back-up protection one direct acting does not returns, then after 300ms, locking transformer dead zone is protected
Protect, concurrent alarm signal.
4, the quick cutting method of other failure in transformer dead zone
When transformator side electric pressure is 35kV and following system, this system is generally isolated neutral system or warp
Arc suppression coil earthing system or grounded system via resistance, then this quick cutting method of side dead-zone fault of transformator can refer to
The quick cutting method of 220kV step down side dead-zone fault.
When transformator side electric pressure is 110kV or 220kV and system above, this system is generally effective grounding
System, then this quick cutting method of side dead-zone fault of transformator can refer to 220kV high voltage side of transformer or medium voltage side is dead
The quick cutting method of district's fault.
When transformator is two-winding transformer, is equivalent to above-mentioned three-winding transformer and has lacked side, only need to consider to become
The depressor both sides quick cutting method of dead-zone fault is the most permissible.
Claims (2)
1. accelerate a transformer dead-zone fault relay protection method for excision, it is characterized in that:
In the tripping operation of transformator side dead-zone fault controls, set following condition,
Condition one, this rear flank of transformator is in operating state or the differential guarantor of this side bus for trip protection exit relay
Protect tripping operation exit relay and be in operating state；
Condition two, when condition one meets, starts pulsatile once T time open and protection；
Condition three, this side of transformator A phase or B phase or C phase current Ipmax reach initiation value, or zero-sequence current Io
Or negative-sequence current I2Reach initiation value, i.e. >=setting valve；
When above-mentioned condition meets, after time delay t1, starting transformer differential protection tripping operation general export loop, starts and jumps
Open each side chopper of transformator；When any of the above-described condition is unsatisfactory for or after the full time T of open and protection, 0s return,
Disconnect starting transformer differential protection tripping operation general export loop.
2. accelerate a transformer dead-zone fault relay protection method for excision, it is characterized in that:
In the tripping operation of transformator side dead-zone fault controls, set following condition:
Condition one, this rear flank of transformator is in operating state or the differential guarantor of this side bus for trip protection exit relay
Protect tripping operation exit relay and be in operating state；
Condition two, when condition one meets, starts pulsatile once T time open and protection；
Condition three, this side of transformator A phase or B phase or C phase current Ipmax reach initiation value, or zero-sequence current Io
Or negative-sequence current I2Reach initiation value, i.e. >=setting valve；
Condition four, when this side chopper is at open position；
When above-mentioned condition meets, through time delay t2 starting transformer differential protection tripping operation general export loop, start and jump
Open each side chopper of transformator；When any of the above-described condition is unsatisfactory for or after the full time T of open and protection, 0s return,
Disconnect starting transformer differential protection tripping operation general export loop.
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| CN1349294A (en) * | 2000-10-17 | 2002-05-15 | 许昌继电器研究所 | Adaptive oscillation fault opening method |
| 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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| JPH11341877A (en) * | 1998-05-22 | 1999-12-10 | Tamiya Inc | Electric motor speed controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1349294A (en) * | 2000-10-17 | 2002-05-15 | 许昌继电器研究所 | Adaptive oscillation fault opening method |
| 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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