CN106486968A - YNy6 transformer differential protection Y sidesway phase current phase compensating method - Google Patents
YNy6 transformer differential protection Y sidesway phase current phase compensating method Download PDFInfo
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- CN106486968A CN106486968A CN201611026059.3A CN201611026059A CN106486968A CN 106486968 A CN106486968 A CN 106486968A CN 201611026059 A CN201611026059 A CN 201611026059A CN 106486968 A CN106486968 A CN 106486968A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
- H02H7/045—Differential protection of transformers
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- Emergency Protection Circuit Devices (AREA)
- Protection Of Transformers (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of YNy6 transformer differential protection Y sidesway phase current phase compensating method, YNy6 transformator Y side and y side, all using eliminating zero-sequence current in phase current, prevent the misoperation that transformer differential protection produces because zero-sequence current affects.For YNy6 transformer differential protection; phase compensation is the method adopting Y sidesway phase on the basis of y side; wherein y side is employed order phase current on the basis of a phase current and eliminates the computational methods of zero-sequence current and carries out current phase compensate, YNy6 transformator Y side is employed to order phase current eliminates the computational methods of zero-sequence current and current in phase corresponding to y side ground principle carries out current phase compensate.The present invention is applied to the electric current software Phase Compensation scheme of transmission and distribution networkses electric substation YNy6 wiring various electric pressure transformer longitudinal linked differential protection device, and simply clear, easily realizes.
Description
Technical field
The present invention relates to a kind of YNy6 transformer longitudinal linked differential protection eliminates zero-sequence current Y sidesway phase current phase compensation side
Method, belongs to the relay protection and control equipment technical field of electrical power distribution electric network.
Background technology
Because electric current possible phase place in transformator each side is inconsistent, therefore transformer longitudinal linked differential protection (hereinafter referred to as transformation
Device differential protection) current phase compensate to be carried out.The method of transformer differential protection current phase compensate has two kinds:1. traditional
Analog shifter:Such as current transformer TA Secondary Winding in YNd11 transformator Y side adopts triangle d-11 wiring, d side TA Secondary Winding
Using star Y-12 wiring;2. digit shifter:Carry out electric current phase shift using software program and computing formula and complete phase place benefit
Repay.At present, 220kV and above tranformer protection are generally main protection, back-up protection integrated design, duplicate system retrofit, main guarantor
Shield, back-up protection integrated design be main protection and all of back-up protection all in a cabinet, using same hardware dress
Put and software, transformator main protection, the electric current of the every side of back-up protection, voltage are all using current transformer TA, voltage transformer
Same group of Secondary Winding.Because the tranformer protection current loop of main protection, back-up protection integration is the same electricity adopting
Flow back to road, so current phase compensate can not be carried out using traditional analog shifter.The current transformer of the therefore each side of transformator
TA must adopt star connection, carries out phase compensation using digit shifter.110kV and following microcomputer transformer differential protection are current
Also current phase compensate is not carried out using traditional analog shifter, the TA of each side is typically also adopted by star connection, is also adopted by differential
The electric current software of protection carries out phase compensation, and progressively to main protection back-up protection integrated design, double set configuration transition.But
Be, at present each tranformer protection manufacturer only devise this several transformer connection group of YNd11, YNd1 and YNyn12 and its
The differential protection current phase compensate method of wiring combination, does not design other wiring groups and the transformator of wiring combination mode
Differential protection electric current software phase compensating method.The present invention will propose a kind of YNy6 transformer differential protection and eliminate zero-sequence current Y
Sidesway phase current Phase Compensation scheme.
Content of the invention
It is an object of the invention to provide a kind of YNy6 transformer differential protection Y sidesway phase current phase compensating method, should
For the various electric pressure main transformers of the various electric pressure electric substations of transmission and distribution networkses, complete YNy6 transformer longitudinal connection poor
Dynamic protection eliminates the phase compensation of zero-sequence current Y sidesway phase current.
The purpose of the present invention is achieved by the following technical programs:
A kind of YNy6 transformer differential protection Y sidesway phase current phase compensating method, comprises the following steps:
Step 1:YNy6 high voltage side of transformer, low-pressure side current transformer TA Secondary Winding are all connected in star connection;
Step 2:On the basis of y side, for y side, because zero-sequence current to be eliminatedImpact to differential protection, so ginseng
A phase current with differential protection differential current computingB phase streamWith c phase currentFor:
(1-3) in formulaFor a phase after device for transformer y side phase compensation, b phase, c phase current;For accessing the current transformer TA secondary current of device for transformer d side a phase, b phase, c phase, wherein,
Step 3:For Y side, it is that Y side makes each phase current of participation differential protection differential current computing and y side participate in differential protection
Each phase current phase place of differential current computing is identical, with y side a phase, b phase, c phase TA secondary current synchronous Y side TA secondary current
It is respectively-A phase ,-B phase ,-C phase, because zero-sequence current to be eliminatedImpact to differential protection, so it is poor to participate in differential protection
The A phase current of stream calculationB phase currentC phase currentIt is respectively:
(4-6) in formulaFor the A phase current of device for transformer Y side participation differential current computing, B phase current, C
Phase current;For the current transformer TA secondary current of access device Y side A phase, B phase, C phase, wherein,
The purpose of the present invention can also be realized further by following technical measures:
Aforementioned YNy6 transformer differential protection Y sidesway phase current phase compensating method, applies also for Yy6 wiring and its connects
The transformator of line combination.
Aforementioned YNy6 transformer differential protection Y sidesway phase current phase compensating method, in based Transformer differential protection
Application is run in device.
Aforementioned YNy6 transformer differential protection Y sidesway phase current phase compensating method, in PLC type transformer differential protection dress
Put middle operation to apply.
Aforementioned YNy6 transformer differential protection Y sidesway phase current phase compensating method, described current transformer TA model
LJZ series.
Compared with prior art, the invention has the beneficial effects as follows:YNy6 transformator Y side and y side are all using in phase current
Eliminate zero-sequence current, prevent the misoperation that transformer differential protection produces because zero-sequence current affects.For YNy6 transformator
Differential protection, phase compensation is the method adopting Y sidesway phase on the basis of y side, and wherein y side is employed on the basis of a phase current
The computational methods that order phase current eliminates zero-sequence current carry out current phase compensate, employ order for YNy6 transformator Y side
Phase current eliminates the computational methods of zero-sequence current and current in phase corresponding to y side ground principle carries out current phase compensate.
By above-mentioned phase transition, the transformator Y side of YNy6 wiring and y side is made to participate in differential protection each phase differential current computing
A phase currentWith a phase currentPhase place is consistent, B phase currentWith b phase streamPhase place is consistent, C phase currentWith c phase currentPhase place is consistent.
Compared with the method used in existing based Transformer differential protection, the present invention is applied to power transmission and distribution
The YNy6 wiring of network electric substation, the electric current software phase place of Yy6 wiring various electric pressure transformer longitudinal linked differential protection device are mended
Repay technical scheme, and simply clear, easily realize.
Brief description
Fig. 1 is the YNy6 transformer connection figure of the present invention;
Fig. 2 is the vector diagram after the YNy6 wiring transformer both sides electric current software compensation of the present invention.
Specific embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, being YNy6 transformer connection figure according to the present invention.
Because computer-based transformer protection is generally main protection back-up protection integrated design, duplicate system retrofit, transformator is poor
Dynamic protection requires YNy6 high voltage side of transformer, low-pressure side TA Secondary Winding to be all connected in wye connection.YNy6 wiring transformer is differential
The electric current software phase compensation scheme of protection device is:
Step 1:YNy6 high voltage side of transformer, low-pressure side current transformer TA Secondary Winding are all connected in star connection;
Step 2:On the basis of y side, for y side, because zero-sequence current to be eliminatedImpact to differential protection, because will
Eliminate zero-sequence currentImpact to differential protection, so participate in a phase current of differential protection differential current computingB phase streamWith
C phase currentFor:
(1-3) in formulaFor a phase after device for transformer y side phase compensation, b phase, c phase current;For accessing the current transformer TA secondary current of device for transformer d side a phase, b phase, c phase, wherein,
Step 3:For Y side, it is that Y side makes each phase current of participation differential protection differential current computing and y side participate in differential protection
Each phase current phase place of differential current computing is identical, with y side a phase, b phase, c phase TA secondary current synchronous Y side TA secondary current
It is respectively-A phase ,-B phase ,-C phase, because zero-sequence current to be eliminatedImpact to differential protection, so it is poor to participate in differential protection
The A phase current of stream calculationB phase currentC phase currentIt is respectively:
(4-6) in formulaFor the A phase current of device for transformer Y side participation differential current computing, B phase current, C
Phase current;For the current transformer TA secondary current of access device Y side A phase, B phase, C phase, wherein,
(4) by above-mentioned phase transition, the transformator Y side of YNy6 wiring and y side is made to participate in differential protection and respectively differ flowmeter
The A phase current calculatedWith a phase currentPhase place is consistent, B phase currentWith b phase streamPhase place is consistent, C phase currentWith c phase
Electric currentPhase place is consistent.
(5) adopt the transformator Y side of YNy6 wiring and y side all to eliminate zero-sequence current using phase differential current, prevent transformator
The misoperation that differential protection produces because zero-sequence current affects;The current phase compensate of transformer differential protection adopts Y side phase
Position compensation method.
Fig. 2 is seen with the vector diagram after the current compensation of y side in Y side, and (a) is the vector diagram after the current compensation of Y side, and (b) is y side electricity
Vector diagram after stream compensation.In Fig. 2
For small current neutral grounding system, due to there is not zero-sequence current, when carrying out step 2,3 conversion, formula (1-
3), zero-sequence current need not be eliminated in formula (4-5).
In addition to the implementation, the present invention can also have other embodiment, all employing equivalents or equivalent transformation shape
The technical scheme becoming, all falls within the protection domain of application claims.
Claims (5)
1. a kind of YNy6 transformer differential protection Y sidesway phase current phase compensating method is it is characterised in that comprise the following steps:
Step 1:YNy6 high voltage side of transformer, low-pressure side current transformer TA Secondary Winding are all connected in star connection;
Step 2:On the basis of y side, for y side, because zero-sequence current to be eliminatedImpact to differential protection, because will eliminate
Zero-sequence currentImpact to differential protection, so participate in a phase current of differential protection differential current computingB phase streamWith c phase
Electric currentFor:
(1-3) in formulaFor a phase after device for transformer y side phase compensation, b phase, c phase current;For accessing the current transformer TA secondary current of device for transformer d side a phase, b phase, c phase, wherein,
Step 3:For Y side, it is that Y side makes each phase current of participation differential protection differential current computing and y side participate in differential protection difference stream
The each phase current phase place calculating is identical, distinguishes with the TA secondary current synchronous Y side TA secondary current of y side a phase, b phase, c phase
For-A phase ,-B phase ,-C phase, because zero-sequence current to be eliminatedImpact to differential protection, so participate in differential protection difference flowmeter
The A phase current calculatedB phase currentC phase currentIt is respectively:
(4-6) in formulaElectric for the A phase current of device for transformer Y side participation differential current computing, B phase current, C phase
Stream;For the current transformer TA secondary current of access device Y side A phase, B phase, C phase, wherein,
2. YNy6 transformer differential protection Y sidesway phase current phase compensating method as claimed in claim 1 it is characterised in that
Can be applicable to the transformator of Yy6 wiring and its wiring combination.
3. YNy6 transformer differential protection Y sidesway phase current phase compensating method as claimed in claim 1 it is characterised in that
Application is run in based Transformer differential protection.
4. YNy6 transformer differential protection Y sidesway phase current phase compensating method as claimed in claim 1 it is characterised in that
Application is run in PLC type differential protective device of transformer.
5. YNy6 transformer differential protection Y sidesway phase current phase compensating method as claimed in claim 1 it is characterised in that
Described current transformer TA model LJZ series.
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CN201611026059.3A CN106486968A (en) | 2016-11-22 | 2016-11-22 | YNy6 transformer differential protection Y sidesway phase current phase compensating method |
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CN201611026059.3A CN106486968A (en) | 2016-11-22 | 2016-11-22 | YNy6 transformer differential protection Y sidesway phase current phase compensating method |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104253412A (en) * | 2014-09-11 | 2014-12-31 | 国家电网公司 | YNd11 transformer longitudinal differential protection current phase compensation method |
CN104377650A (en) * | 2014-09-11 | 2015-02-25 | 国家电网公司 | YNd7 wiring transformer longitudinal differential protection current phase compensation method |
CN104852353A (en) * | 2015-05-06 | 2015-08-19 | 国家电网公司 | YNd5 transformer longitudinal differential protection Y side current phase compensation method |
CN105024348A (en) * | 2015-05-06 | 2015-11-04 | 国家电网公司 | D-side current phase compensation method for YNd5 transformer longitudinal differential protection |
-
2016
- 2016-11-22 CN CN201611026059.3A patent/CN106486968A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104253412A (en) * | 2014-09-11 | 2014-12-31 | 国家电网公司 | YNd11 transformer longitudinal differential protection current phase compensation method |
CN104377650A (en) * | 2014-09-11 | 2015-02-25 | 国家电网公司 | YNd7 wiring transformer longitudinal differential protection current phase compensation method |
CN104852353A (en) * | 2015-05-06 | 2015-08-19 | 国家电网公司 | YNd5 transformer longitudinal differential protection Y side current phase compensation method |
CN105024348A (en) * | 2015-05-06 | 2015-11-04 | 国家电网公司 | D-side current phase compensation method for YNd5 transformer longitudinal differential protection |
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Application publication date: 20170308 |