CN103633621B - Short-time opening protection based transformer dead zone fault relay protection method - Google Patents
Short-time opening protection based transformer dead zone fault relay protection method Download PDFInfo
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Abstract
The invention relates to a short-time opening protection based transformer dead zone fault relay protection method. The method includes in tripping control of dead zone fault on a certain side of a transformer, setting following conditions: firstly, a back-up protection tripping exit relay on the side of the transformer is in an action state or other electrical capacity protection tripping exit relays are in action states; secondly, when the first condition is satisfied, primary pulse T-time opening protection is started; thirdly, A-phase, B-phase or C-phase current on the side of the transformer reaches a starting value, or zero-sequence current or negative-sequence current reaches the starting value; when the conditions are satisfied, delaying prior to starting a transformer differential protection tripping main exit loop, and starting a circuit breaker of each side of a tripping-off transformer; when any one of the conditions is unsatisfied or after opening protection lasts for time T, returning by 0s, and disconnecting the transformer differential protection tripping main exit loop. The method is simple in action principle, high in reliability and capable of rapidly clearing dead zone faults of various voltage classes of each side of the transformer.
Description
Technical field
The invention belongs to power transmission and distribution network-based control technology, is related to a kind of transformator based on open and protection in short-term dead
Area's failure relay protecting method.
Background technology
GB/T14285-2006《Relay protection and automatic safety device technical regulation》Regulation, it is poor that transformator should install vertical connection
Dynamic protection causes back-up protection of transformator overcurrent etc. electrically as main protection and the outside phase fault of reaction and ground short circuit
Amount protection, wherein the back-up protection of reaction phase fault has composite voltage overcurrent protection, phase to phase impedance protection, reaction ground connection is short
The back-up protection on road has zero-sequence current protection, impedance ground protection.Transformator of these back-up protections according to different electric pressures
It is different with each side electric pressure, different back-up protections are installed, and general installing in each side of transformator reacts outside alternate
Short circuit and the back-up protection of ground short circuit.220kV and above tranformer protection configuring condition are in Q/GDW_175《Transformator, high pressure
Shunt reactor and bus protection and auxiliary device standardized designs specification》There is concrete regulation；110kV and following tranformer protection
The composite voltage overcurrent protection of two-stage reaction phase fault is mainly installed in configuration in each side（If 110kV neutral points typically do not connect
During ground, then zero-sequence current protection is configured with also typically without only using 110kV neutral point gap relays；If 110kV neutral points one
As when being grounded, then be configured with zero-sequence current protection use, 110kV neutral point gap relays are disabled）.
So-called failure in transformer dead zone means that the chopper occurred in transformator side is protected with the side transformer differential
The current transformer for using（Hereinafter referred to as TA）Between short trouble（See Fig. 2）.As the failure is in transformator longitudinal differential
Outside protection protection domain, although the back-up protection of failure side or other protections（Such as bus protection）Action, tripping transformator should
Side chopper, but failure yet suffers from, only by the back-up protection action of transformer frequency response side or adopts this side back-up protection action
Connection saltus step depressor general export loop tripping transformer frequency response side chopper could finally cut off failure, during this kind of situation excision failure
Between it is general longer；If transformator is high-impedance transformer, the back-up protection of transformer frequency response side is not reached because of short circuit current
Start definite value and akinesia excision failure, only waiting until that transformator burns makes short circuit current meet and exceed the back-up protection to open
Till dynamic value can make transformer frequency response side back-up protection action excision failure.Although patent of invention ZL200810201305.3
Other sides of connection saltus step depressor after judging dead-zone fault are proposed in " relay protecting method of eliminating transformer dead-zone fault " breaking
The scheme of device, but excision fault time is still slightly long, and only adapt to 110kV transformators.
The content of the invention
Problem to be solved by this invention is to provide one kind and can be applied to transmission and distribution networkses for various electric pressure power transformations
Institute's protection equipment for transformer, operating principle is simple, reliability is high, the various electric pressure dead-zone faults in each side of quick excision transformator
Relay protecting method.
The technical scheme of the inventive method is given below.
The two-winding transformer of various electric pressures carried out by the power transformation of the transmission and distribution networkses applied in the method for the present invention,
The protection device of three-winding transformer, autotransformer or other transformators；In theory, transformator has several working voltages etc.
Level passes through breaker interval equipment（It is made up of equipment such as disconnecting switch, chopper, current transformers）It is connected with dispatch from foreign news agency pipeline equipment,
Just there are several failure in transformer dead zone positions, that is, there are 2 working voltage grades by breaker interval equipment and dispatch from foreign news agency pipeline equipment
It is connected, as long as transformator side chopper both sides only has this side of transformator and has current transformer（Abbreviation TA）, and bus bar side
Without TA, just there are several failure in transformer dead zone positions（If there is TA chopper both sides, the chopper loop is with regard to no dead band
Abort situation）；There are 3 working voltage grades to be connected with dispatch from foreign news agency pipeline equipment by breaker interval equipment, just at least 3 transformations
Device dead-zone fault position（If 1 working voltage grade has 2 breaker interval equipment, the working voltage grade side becomes for 2
Depressor dead-zone fault position）.
For sake of convenience, there is transformer dead zone with the breaker interval equipment of the one of working voltage grade of transformator
Failure, describes the quick method for starting and cutting off the failure, and the transformator and transformator of other electric pressures become for two windings
Depressor, three-winding transformer, autotransformer or other transformators, or each side of transformator is by the combination of other electric pressures, its
Method is similar to, and is no longer tired of and states.The breaker interval equipment is made up of equipment such as disconnecting switch, chopper, TA, and TA has several groups respectively
Secondary Winding, this several groups of Secondary Windings are respectively connected to transformer differential protection from the lateral transformer side of bus（Back-up protection）, it is female
The secondary devices such as line differential protection, measuring.Sleeve pipe TA has been installed at bushing shell for transformer also.110kV and following transformator are each
Side back-up protection using TA be to separate with transformer differential protection, the TA for using is different TA（Such as differential protection makes
With TA at chopper, and back-up protection uses sleeve pipe TA）, or the different Secondary Winding of TA.Its control method includes following
Control process：
In the tripping operation control of transformator side dead-zone fault, following condition is set：
Condition one, the transformator side back-up protection tripping operation exit relay is in operating state or other electric parameters protections
（The such as 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（That is an open and protection T time；T can
300ms is taken, similarly hereinafter）.
Condition three, transformator side A phases or B phases or C phase current Ipmax reach initiation value, or zero-sequence current Io or negative phase-sequence
Electric current I2 reaches initiation value, i.e., >=setting valve.
When above-mentioned condition meets, time delay t1（Such as 150ms）Starting transformer differential protection tripping operation general export loop, opens afterwards
Each side chopper of dynamic tripping transformator, quickly cut off this failure in transformer dead zone so as to reach；When any of the above-described condition not
When meeting or after open and protection full time T, 0s is returned, and disconnects starting transformer differential protection tripping operation general export loop.
Judge that transformator side A phases or B phases or C phases also have electric current, the transformator side differential protection TA electric currents can be gathered, should
Current ration can be adjusted by the transformator side maximum load current is escaped；When the transformator side is effectively earthed system, zero sequence
Electric current or negative-sequence current definite value the side bus earth fault can have enough sensitivity to adjust by transformator（Sensitivity coefficient is desirable >=
3）.
When transformator side electric pressure is 35kV and following system, the system is generally isolated neutral system or Jing disappears
Arc coil earthed system, then the transformator side zero sequence current criterion can be without.If resistance grounded system, then transformator side zero
Sequence electric current criterion can be used.
It is of the invention with it is existing excision failure in transformer dead zone method compared with, have the advantage that：
1. suitable for transmission and distribution networkses power transformation carried out by the two-winding transformer of various electric pressures, three-winding transformer,
The technical scheme of the isallobaric device protection device of autotransformer.
2. just directly initiate transformer differential protection tripping operation always to go out after adopting time delay 150ms after the method judges dead-zone fault
Mouth loop, starts each side chopper of tripping transformator, and criterion is simple and practical, has reached the mesh of the quick excision dead-zone fault
's；
3., as breaker open operation position contact is not added in criterion, for electric substation's side bus failure, bus is protected
Shield action or the back-up protection action of transformer fault side, but transformer fault side chopper miss operation（Breaker failure）, this
Scheme of the invention also can just directly initiate transformer differential protection tripping operation general export after chopper tripping is judged and return after time delay 150ms
Road, starts each side chopper of tripping transformator, so as to quickly cut off this failure.
4. the T time loop of short time open and protection is increased, the safety of the failure in transformer dead zone protection is enhanced.
Description of the drawings
Fig. 1 is the logic that the transformator side dead-zone fault starting transformer of the inventive method protects general export's relay
Figure；
Fig. 2 is existing 220kV electric substations part primary connection circuit figure.
In Fig. 1, symbol description is as follows：
- representing logical AND relation, i.e., when input condition all meets, output is effective；
- representing logic or relation, i.e. input condition are arbitrary when meeting, output is effective；
- representing that input condition meets 150 milliseconds of time delay, input condition is unsatisfactory for 0 second returning；
- represent 300ms pulses output.
Specific embodiment
By taking the one 220kV autotransformer protection of 220kV electric substations as an example, describe failure in transformer dead zone and quickly start
The method for cutting off the failure, the transformator and transformator of other electric pressures be two-winding transformer, three-winding transformer,
Autotransformer or other transformators, or each side of transformator, by the combination of other electric pressures, its method is similar to, and is no longer tired of and states.
As shown in Fig. 2 being 220kV electric substations part primary connection circuit figure, a 220kV autotransformer, transformator are 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, medium voltage side chopper 2QF
Place, the TA for being equiped with one group of independence at low-pressure side chopper 3QF respectively, TA have several groups of Secondary Windings respectively, high voltage side of transformer,
Sleeve pipe TA has been installed at medium voltage side and neutral point also.220kV transformators each side TA configurations are as shown in Fig. 2 wherein transformer high-voltage
Side（220kV）At chopper TA Secondary Windings by the lateral transformer side of bus be connected to respectively first set transformator longitudinal differential and after
Standby protection, second set of transformator longitudinal differential and back-up protection（220kV tranformer protections typically adopt main protection and back-up protection
The each side of unified collocation, i.e. main protection and back-up protection public same group of TA Secondary Windings, secondary windings of PT, and it is main
Protection and back-up protection all hardware equipment and software are in same cabinet）, first set 220kV bus differential protectings, second
Set 220kV bus differential protectings（By Q/GDW_175《Transformator, high-voltage shunt reactor and bus protection and auxiliary device standard
Change design specification》The tranformer protection of design is not provided with special breaker failure current loop, by bus differential protecting reality
It is existing；Otherwise have and special breaker failure current loop is set）, metering, measurement；Transformator medium voltage side（110kV）At chopper
TA Secondary Windings are connected to first set transformator longitudinal differential and back-up protection, second set of transformation respectively by the lateral transformer side of bus
Device longitudinal differential and back-up protection, 110kV bus differential protectings, metering, measurement；Step down side（35kV or 10kV etc.）It is disconnected
At the device of road TA Secondary Windings by the lateral transformer side of bus be connected to respectively first set transformator longitudinal differential and back-up protection, second
Set transformator longitudinal differential and back-up protection（Bus protection）, failure wave-recording, metering, measurement etc..
The inventive method is given below and is applied to the embodiment that failure in transformer dead zone quickly cuts off the failure：
1st, the quick cutting method of high voltage side of transformer dead-zone fault
(1) as the high-pressure side TA that high voltage side of transformer chopper lQF is used with transformer differential protection（That is high-pressure side open circuit
TA at device）Between there is phase fault or during earth fault, failure outside transformer longitudinal linked differential protection scope, but the
Within a set of 220kV bus differential protectings, second set of 220kV bus differential protecting protection domain, first set 220kV bus differentials
Protection, all switches of second set 220kV bus differential protecting startup tripping fault bus（Chopper containing high voltage side of transformer
lQF）.If there is power supply other sides of transformator, although chopper 1QF trippings, but failure does not cut off, failure mutually still have electric current or
Zero-sequence current or negative-sequence current exceed setting valve, therefore first set 220kV bus differential protectings, second set of 220kV bus differential are protected
Shield still action is not returned（Or the high voltage side of transformer back-up protection start-up study time is not returned to back-up protection still action
Return）, start open and protection 300ms loops, therefore judge that three conditions of dead-zone fault meet, after time delay t1 is 150ms, starts and become
Depressor differential protection tripping operation general export loop, starts each side chopper of tripping transformator, has cut off the failure.
(2) when high voltage side of transformer chopper lQF occurs above-mentioned high voltage side of transformer dead-zone fault in open position, therefore
Barrier is outside transformer longitudinal linked differential protection scope but poor in first set 220kV bus differential protectings, second set of 220kV bus
Within dynamic protection protection domain, first set 220kV bus differential protectings, second set of 220kV bus differential protecting start tripping and are somebody's turn to do
The all switches of fault bus.If there is power supply other sides of transformator, although chopper 1QF is in open position, but failure mutually has short
Road electric current or zero-sequence current or negative-sequence current exceed setting valve, first set 220kV bus differential protectings, second set of 220kV bus
Differential protection action or high voltage side of transformer back-up protection start-up study time, to action, start open and protection 300ms loops, therefore
Judge that three conditions of dead-zone fault meet, after time delay t1 is 150ms, starting transformer differential protection tripping operation general export loop,
Start each side chopper of tripping transformator, cut off the failure.
(3) if 220kV bus-bar faults, although two sets of 220kV bus differential protecting actions, two sets of 220kV bus differentials
Protection starts the tripping fault bus other all switches, but high voltage side of transformer chopper lQF miss operations, if transformator its
There is power supply its side, then failure does not cut off, and failure mutually still has electric current or zero-sequence current or negative-sequence current exceedes setting valve, therefore first
Set 220kV bus differential protectings, second set of 220kV bus differential protectings still action are not returned（Or after high voltage side of transformer
The standby protection start-up study time is not returned to back-up protection still action）, start open and protection 300ms loops, therefore judge dead
Three conditions of area's failure meet, and after time delay t1 is 150ms, starting transformer differential protection tripping operation general export loop starts and jumps
Each side chopper of transformator is opened, the failure has been cut off.
(4) if other sides of electric substation's transformator do not have power supply, transformer fault side does not have 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's loop saltus step pressure would not be started
Each side chopper of device.If 220kV bus differential protectings or one direct acting of high voltage side of transformer back-up protection are not returned,
The protection of locking transformer dead zone, concurrent alarm signal after 300ms.
2nd, the quick cutting method of transformator medium voltage side dead-zone fault
(1) as the medium voltage side TA that transformator medium voltage side chopper 2QF is used with transformer differential protection（That is medium voltage side open circuit
TA at device）Between press when transformator and phase fault occur or during earth fault between side chopper 2QF and pressure side chopper TA,
Failure is outside transformer longitudinal linked differential protection scope, but within the protection domain of 110kV bus differential protectings, 110kV is female
The all switches of the line differential protection startup tripping fault bus（The chopper 2QF of medium voltage side containing transformator）, although chopper 2QF is
Tripping, but failure do not cut off, failure mutually still has electric current or zero-sequence current or negative-sequence current exceedes setting valve, therefore 110kV buses
Differential protection still action is not returned（Or the high voltage side of transformer back-up protection start-up study time is to back-up protection still action
Without return）, start open and protection 300ms loops, therefore judge that three conditions of dead-zone fault meet, after time delay t1 is 150ms,
Or medium voltage side chopper 2QF is in 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 cut off the failure.
(2) when transformator medium voltage side chopper 2QF occurs above-mentioned transformator medium voltage side dead-zone fault in open position, therefore
Barrier is outside transformer longitudinal linked differential protection scope, but within 110kV bus differential protecting protection domains, 110kV buses are poor
The all switches of the dynamic protection startup tripping fault bus.Although in open position, failure mutually has short circuit current to chopper 2QF
Or zero-sequence current or negative-sequence current exceed setting valve, the action of 110kV bus differential protectings or high voltage side of transformer back-up protection are opened
Dynamic delay time is to action, therefore judges that two conditions of dead-zone fault meet, after time delay 150ms, starting transformer differential protection
Tripping operation general export loop, starts each side chopper of tripping transformator, has cut off the failure.
(3) if 110kV bus-bar faults, although 110kV bus differential protecting actions, 110kV bus differential protectings start
The tripping fault bus other all switches, but transformator medium voltage side chopper 2QF trippings, but failure do not cut off, failure phase
Still there are electric current or zero-sequence current or negative-sequence current to exceed setting valve, therefore the still action of 110kV bus differential protectings is not returned（Or
The transformator medium voltage side back-up protection start-up study time is not returned 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, the tripping operation of starting transformer differential protection always goes out
Mouth loop, starts each side chopper of tripping transformator, has cut off the failure.
(4) if 110kV bus differential protectings or one direct acting of high voltage side of transformer back-up protection are not returned, after 300ms
Locking transformer dead zone is protected, concurrent alarm signal.
3rd, the quick cutting method of step down side dead-zone fault
(1) step down side electric pressure be generally 35kV and following system, the system be generally isolated neutral system or
Compensated distribution network or grounded system via resistance, typically do not install special bus differential protecting, by therein a set of
Step down side back-up protection is protected as bus.When step down side chopper 3QF and transformer differential protection are used
Low-pressure side TA（TA i.e. at low-pressure side chopper）Between there is phase fault or earth fault（During grounded system via resistance）When,
Failure outside transformer longitudinal linked differential protection scope, but within the protection domain of step down side back-up protection, transformation
The back-up protection of device low-pressure side starts tripping step down side chopper 3QF.Although chopper 3QF trippings, failure do not have
Excision, failure mutually still have electric current or negative-sequence current or zero-sequence current to exceed setting valve（During grounded system via resistance）, therefore low pressure is female
The still action of line differential protection is not returned（Or step down side back-up protection（When no bus protection, by therein one
Set low-pressure side back-up protection is used as bus protection）The start-up study time is not returned to back-up protection still action）, start and open
Protection 300ms loops, therefore judge that three conditions of dead-zone fault meet, after time delay t1 is 150ms, starting transformer differential protection
Tripping operation general export loop, starts each side chopper of tripping transformator, has cut off the failure.
(2) when step down side chopper 3QF occurs above-mentioned low-pressure side dead-zone fault in open position, failure exists
Outside transformer longitudinal linked differential protection scope, but within the protection domain of step down side back-up protection, transformer low voltage
Side back-up protection starts；Although in open position, failure mutually still has electric current or negative-sequence current or zero-sequence current to chopper 3QF
More than setting valve（During grounded system via resistance）, when the action of low-voltage bus bar differential protection or step down side back-up protection（When
During without bus protection, by a set of low-pressure side back-up protection therein as bus protection）The action of start-up study time, startup are opened
Protection 300ms loops are put, therefore judges that three conditions of dead-zone fault meet, after time delay t1 is 150ms, the differential guarantor of starting transformer
Shield tripping operation general export loop, starts each side chopper of tripping transformator, has cut off the failure.
(3) if low-voltage bus bar failure, although step down side back-up protection action, but step down side chopper
2QF trippings, so failure does not cut off, failure mutually still has electric current or negative-sequence current to exceed setting valve, low-voltage bus bar differential protection
Still action is not returned（Or the step down side back-up protection start-up study time is not returned to back-up protection still action
Return）, start open and protection 300ms loops, therefore judge that three conditions of dead-zone fault meet, after time delay t1 is 150ms, starts and become
Depressor differential protection tripping operation general export loop, starts each side chopper of tripping transformator, has cut off the failure.
(4) if one direct acting of step down side back-up protection is not returned, locking transformer dead zone protection after 300ms,
Concurrent alarm signal.
4th, the quick cutting method of other failure in transformer dead zone
When transformator side electric pressure is 35kV and following system, the system is generally isolated neutral system or Jing extinguishing arcs
Coil earthed system or grounded system via resistance, then the transformator quick cutting method of side dead-zone fault can refer to 220kV transformations
The quick cutting method of device low-pressure side dead-zone fault.
When transformator side electric pressure is 110kV or 220kV and system above, the system is generally effective grounding system
System, then the transformator quick cutting method of side dead-zone fault can refer to 220kV high voltage side of transformer or medium voltage side dead-zone fault is fast
Fast cutting method.
When transformator is two-winding transformer, lack side equivalent to above-mentioned three-winding transformer, only need to consider transformation
The quick cutting method of device both sides dead-zone fault just can be with.
Claims (1)
1. a kind of transformer dead-zone fault relay protection method based on open and protection in short-term, is characterized in that：Its control method bag
Following control process is included,
In the tripping operation control of transformator side dead-zone fault, following condition is set：
Condition one, transformator side back-up protection tripping operation exit relay are in operating state；
Condition two, when condition one meets, starts pulsatile once T time open and protection；
Condition three, transformator side A phases or B phases or C phase current Ipmax reach initiation value, or zero-sequence current Io or negative-sequence current I2
Reach initiation value；
When above-mentioned condition meets, after time delay t1, starting transformer differential protection tripping operation general export loop, starts tripping transformator
Each side chopper；When any of the above-described condition is unsatisfactory for or after open and protection full time T, 0s is returned, and disconnects starting transformer
Differential protection tripping operation general export loop.
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| CN201310641655.2A CN103633621B (en) | 2013-12-03 | 2013-12-03 | Short-time opening protection based transformer dead zone fault relay protection method |
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| CN201310641655.2A CN103633621B (en) | 2013-12-03 | 2013-12-03 | Short-time opening protection based transformer dead zone fault relay protection method |
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| CN103633621B true CN103633621B (en) | 2017-05-10 |
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| CN111668816B (en) * | 2020-05-14 | 2022-07-12 | 许昌许继软件技术有限公司 | Breaker dead zone fault processing method based on electronic transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0260412A (en) * | 1988-08-23 | 1990-02-28 | Mitsubishi Electric Corp | Protective relay |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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