CN106786382A - YNy2 transformer differential protection current compensation methods based on y sides - Google Patents
YNy2 transformer differential protection current compensation methods based on y sides Download PDFInfo
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- CN106786382A CN106786382A CN201611062045.7A CN201611062045A CN106786382A CN 106786382 A CN106786382 A CN 106786382A CN 201611062045 A CN201611062045 A CN 201611062045A CN 106786382 A CN106786382 A CN 106786382A
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Protection Of Transformers (AREA)
Abstract
The invention discloses a kind of YNy2 transformer differential protection current compensation methods based on y sides,By YNy2 high voltage side of transformer,Low-pressure side current transformer TA Secondary Windings are connected in star connection,For YNy2 transformer differential protections,Phase compensation is the phase compensating method for carrying out phase transition to Y sides on the basis of y sides,Wherein each phase current in y sides carries out phase transition and carries out current phase compensate using the phase shift of order phase differential current,For YNy2 transformer Y sides, using the phase shift of backward phase differential current, principle carries out current phase compensate with carrying out phase transition and current in phase corresponding to y sides,Phase transition formula,With elimination zero-sequence current and completion phase transition function,Prevent the misoperation produced because zero-sequence current influences during transformer differential protection,The present invention is applied to the YNy2 wiring of transmission and distribution networkses electric substation,The electric current software Phase Compensation scheme of the various voltage class transformer longitudinal linked differential protection devices of Yy2,And it is simple clear,Easily realize.
Description
Technical field
The present invention relates to a kind of YNy2 transformer differential protection current compensation methods based on y sides, belong to power transmission and distribution
The relay protection and control equipment technical field of network.
Background technology
Due to each side electric current of transformer may phase it is inconsistent, therefore transformer longitudinal linked differential protection (hereinafter referred to as transformation
Device differential protection) to carry out current phase compensate.The method of transformer differential protection current phase compensate has two kinds：1. traditional
Analog shifter：Such as current transformer TA Secondary Windings in YNd11 transformers Y sides use triangle d-11 wiring, d sides TA Secondary Windings
Using star Y-12 wiring；2. digit shifter：Electric current phase shift is carried out using software program and computing formula to complete phase 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 in a cabinet, filled using same hardware
Put and software, electric current, the voltage of transformer main protection, back-up protection per side are 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 of use
Road is flowed back to, so current phase compensate can not be carried out using traditional analog shifter.Therefore the current transformer of each side of transformer
TA must use star connection, and phase compensation is carried out using digit shifter.110kV and following microcomputer transformer differential protection are current
Also not using traditional analog shifter carries out current phase compensate, and 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, current 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 the transformer of other wiring groups and wiring combination mode
Differential protection electric current software phase compensating method.The present invention will propose that a kind of YNy2 transformer differential protections eliminate zero-sequence current y
Sidesway phase current Phase Compensation scheme.
The content of the invention
It is an object of the invention to provide a kind of YNy2 transformer differential protection current compensation methods based on y sides, application
In the various voltage class main transformers of the various voltage class electric substations of transmission and distribution networkses, complete to join YNy2 transformer Y sides
With the phase compensation of every electric current of differential protection differential current computing.
The purpose of the present invention is achieved by the following technical programs：
A kind of YNy2 transformer differential protection current compensation methods based on y sides, comprise the following steps：
Step 1：YNy2 high voltage side of transformer, low-pressure side current transformer TA Secondary Windings are connected in star connection；
Step 2：Line phase is entered by order phase differential current phase shift to every electric current that y sides participate in differential protection Current calculation
Conversion；
Step 3：Based on after phase transition described in step 2 y sides participate in differential protection Current calculation every electric current to
Amount, phase transition is carried out to every electric current that Y sides participate in differential protection Current calculation by the phase shift of backward difference between current, joins Y sides
It is consistent with the current phase that current phase and y sides that differential protection is calculated participate in differential protection calculating, complete current phase compensate.
The purpose of the present invention can also further be realized by following technical measures：
The foregoing YNy2 transformer differential protection current compensation methods based on y sides, participate in differential by equation below to y sides
Every electric current that protective current is calculated carries out phase transition by the phase shift of order phase differential current；
In above formulaIt is a phases, b phases, the c phase currents after device y side phase compensations； To connect
Enter transformer y sides a phase, b phases, the current transformer TA secondary currents of c phases.
The foregoing YNy2 transformer differential protection current compensation methods based on y sides, participate in differential by equation below to Y sides
Every electric current that protective current is calculated carries out phase transition by the phase shift of backward phase differential current；
In above formulaA phase currents, B phase currents, the C phase currents of differential current computing are participated in for transformer Y sides；To access the secondary current of the current transformer TA of transformer Y sides A phase, B phase, C phase.
The foregoing YNy2 transformer differential protection current compensation methods based on y sides, in PLC type differential protective device of transformer
Middle operation application.
The foregoing YNy2 transformer differential protection current compensation methods based on y sides, the current transformer TA models LJZ
Series.
Compared with prior art, the beneficial effects of the invention are as follows：For YNy2 transformer differential protections, phase compensation be with
The phase compensating method of phase transition is carried out on the basis of y sides to Y sides, the wherein each phase current in y sides uses order phase differential current phase shift
Carrying out phase transition carries out current phase compensate, and entering line phase using backward phase differential current phase shift for YNy2 transformer Y sides turns
Change and current in phase corresponding to y sides ground principle carries out current phase compensate.
The order phase differential current phase shift phase transition formula of use, backward phase differential current phase shift phase transition formula, have
Zero-sequence current and completion phase transition function in the every electric current for participating in differential protection differential current computing are eliminated, prevents transformer poor
The misoperation produced because zero-sequence current influences during dynamic protection.
By above-mentioned phase transition, the transformer Y sides and y sides for making YNy2 wiring participate in each phase differential current computing of differential protection
A phase currentsWith a phase currentsPhase is consistent, B phase currentsFlowed with b phasesPhase is consistent, C phase currentsWith c phase currentsPhase is consistent.
Compared with the method used in existing based Transformer differential protection, the present invention is applied to power transmission and distribution
Network electric substation YNy2 wiring, the electric current software phase of the various voltage class transformer longitudinal linked differential protection devices of Yy2 wiring are mended
Technical scheme is repaid, and it is simple clear, easily realize.
Brief description of the drawings
Fig. 1 is YNy2 transformer connections figure of the invention；
Fig. 2 is the vectogram after the electric current software compensation of YNy2 wiring transformers Y sides of the invention；
Fig. 3 is the vectogram after the electric current software compensation of YNy2 wiring transformers y sides of the 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 YNy2 transformer connections figure of the present invention.
In order to adapt to the configuration of main protection back-up protection integration, we are to YNy2 high voltage side of transformer, low-pressure side TA bis-
Secondary winding is connected with star connection.
YNy2 transformer differential protection current compensation schemes based on y sides comprise the following steps：
Step 1：YNy2 high voltage side of transformer, low-pressure side current transformer TA Secondary Windings are connected in star connection；
Step 2：Line phase is entered by order phase differential current phase shift to every electric current that y sides participate in differential protection Current calculation
Conversion；
Step 3：Every current vector of differential protection Current calculation is participated in based on the y sides after phase transition, Y sides are participated in
Every electric current of differential protection Current calculation carries out phase transition by the phase shift of backward difference between current, Y sides is participated in differential protection meter
The current phase of calculation is consistent with the current phase that y sides participate in differential protection calculating, completes current phase compensate.
Every electric current that y sides participate in differential protection Current calculation can be moved by order phase differential current by equation below
Mutually carry out phase transition；
In (1-3) formulaIt is a phases, b phases, the c phase currents after device y side phase compensations；To access the current transformer TA secondary currents of transformer y sides a phase, b phases, c phases.
The Y side bases of YNy2 transformers can be participated in by equation below in y sides items current phase compensate principle to Y sides
Every electric current of differential protection Current calculation carries out phase transition by the phase shift of backward phase differential current；
In (4-6) formulaA phase currents, B phase currents, the C phases electricity of differential current computing are participated in for transformer Y sides
Stream；To access the secondary current of the current transformer TA of transformer Y sides A phase, B phase, C phase.
By (1-6) formula while phase transition is carried out, also to zero in every electric current of both sides participation differential current computing
Sequence electric current is eliminated, the misoperation for preventing transformer differential protection from being produced because zero-sequence current influences.
Because the molecular moiety in formula is that vector is calculated in direction, and vector does not only have direction and also has specifically
Amplitude.It is equal if necessary to both members, then not only it is consistent on direction, it is also identical in amplitude, by calculation,
Denominator can ensure that both members are all identical on direction and amplitude divided by radical sign 3.
Vectogram after Y sides and y sides current compensation as shown in Fig. 2 Fig. 2 be after the current compensation of Y sides to
Spirogram, Fig. 3 is the vectogram after the current compensation of y sides, wherein
In addition to the implementation, the present invention can also have other embodiment, all use equivalents or equivalent transformation shape
Into technical scheme, all fall within the protection domain of application claims.
Claims (5)
1. a kind of YNy2 transformer differential protection current compensation methods based on y sides, it is characterised in that comprise the following steps：
Step 1：YNy2 high voltage side of transformer, low-pressure side current transformer TA Secondary Windings are connected in star connection；
Step 2：Every electric current that differential protection Current calculation is participated in y sides enters line phase turn by order phase differential current phase shift
Change；
Step 3：Every current vector of differential protection Current calculation is participated in based on the y sides after phase transition described in step 2, it is right
Every electric current that Y sides participate in differential protection Current calculation carries out phase transition by the phase shift of backward difference between current, participates in Y sides differential
Protect the current phase for calculating consistent with the current phase that y sides participate in differential protection calculating, complete current phase compensate.
2. the YNy2 transformer differential protection current compensation methods of y sides are based on as claimed in claim 1, it is characterised in that logical
Cross equation below and line phase turn is entered by order phase differential current phase shift to every electric current of y sides participation differential protection Current calculation
Change；
In above formulaIt is a phases, b phases, the c phase currents after device y side phase compensations； Become to access
Depressor y sides a phase, b phases, the current transformer TA secondary currents of c phases.
3. the YNy2 transformer differential protection current compensation methods of y sides are based on as claimed in claim 1 or 2, it is characterised in that
Every electric current that differential protection Current calculation is participated in Y sides by equation below enters line phase and turns by backward phase differential current phase shift
Change；
In above formulaA phase currents, B phase currents, the C phase currents of differential current computing are participated in for transformer Y sides；To access the secondary current of the current transformer TA of transformer Y sides A phase, B phase, C phase.
4. the YNy2 transformer differential protection current compensation methods of y sides are based on as claimed in claim 1, it is characterised in that
Application is run in PLC type differential protective device of transformer.
5. the YNy2 transformer differential protection current compensation methods of y sides are based on as claimed in claim 1, it is characterised in that institute
State current transformer TA models LJZ series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611062045.7A CN106786382A (en) | 2016-11-28 | 2016-11-28 | YNy2 transformer differential protection current compensation methods based on y sides |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611062045.7A CN106786382A (en) | 2016-11-28 | 2016-11-28 | YNy2 transformer differential protection current compensation methods based on y sides |
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| CN106786382A true CN106786382A (en) | 2017-05-31 |
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| CN201611062045.7A Pending CN106786382A (en) | 2016-11-28 | 2016-11-28 | YNy2 transformer differential protection current compensation methods based on y sides |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111009907A (en) * | 2019-12-12 | 2020-04-14 | 河北百思特电气有限公司 | Transformer compensation device and compensation method |
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 |
| CN104701814A (en) * | 2015-03-13 | 2015-06-10 | 国家电网公司 | Phase compensating method for longitudinal differential protective current of YNd7 wired transformer |
| 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
- 2016-11-28 CN CN201611062045.7A patent/CN106786382A/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 |
| CN104701814A (en) * | 2015-03-13 | 2015-06-10 | 国家电网公司 | Phase compensating method for longitudinal differential protective current of YNd7 wired transformer |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111009907A (en) * | 2019-12-12 | 2020-04-14 | 河北百思特电气有限公司 | Transformer compensation device and compensation method |
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Application publication date: 20170531 |