CN106532643A - Differential protection Y-side phase-shift current phase compensation method of YNd9 transformer - Google Patents
Differential protection Y-side phase-shift current phase compensation method of YNd9 transformer Download PDFInfo
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- CN106532643A CN106532643A CN201611026056.XA CN201611026056A CN106532643A CN 106532643 A CN106532643 A CN 106532643A CN 201611026056 A CN201611026056 A CN 201611026056A CN 106532643 A CN106532643 A CN 106532643A
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- phase
- current
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- differential protection
- ynd9
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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
Abstract
The invention provides a differential protection Y-side phase-shift current phase compensation method of a YNd9 transformer. The method provided by the invention is used for phase compensation for Y-side phase shift of a differential protection protective device of a YNd wiring transformer. The method comprises the following steps: firstly obtaining current for participating differential protection calculation on d side; then carrying out soft phase shift on the current for participating differential protection calculation on the side based on the phase of the obtained current for participating differential protection calculation so as to obtain the phase of current for participating differential protection calculation on Y side which is consistent with the phase of the current for participating differential protection calculation. Through the scheme, the technical effect of quickly and conveniently carrying out current phase compensation on differential protection of the YNd transformer is obtained through a software phase shift method.
Description
Technical field
The present invention relates to YNd9 transformer differential protection Y sidesway phase current phase compensating methods, belong to electrical power distribution electrical network
The relay protection and control technical field of network.
Background technology
Because there is the inconsistent situation of phase place, the therefore (letter below of transformer longitudinal linked differential protection in each side electric current of transformator
Claim " differential protection ") current phase compensate will be carried out.The existing method of transformer differential protection current phase compensate：
The first is analog shifter method, realizes phase compensation, for example：YNd11 transformator Y sides current transformer (with
Lower abbreviation " TA ") Secondary Winding adopts star Y-12 wiring using triangle d-11 wiring, d sides TA Secondary Winding.
Second is digit shifter method, realizes phase compensation.
The third is combination of hardware digit shifter method, realizes phase compensation, such as Application No.：
201410460996.4,201510109771.9 and 201210452816.9 three kinds of compensation methodes for being proposed.
Nowadays more than 220kV tranformer protections typically adopt main protection back-up protection integrated design, due to main protection
Back-up protection integrated transformer protective current loop adopts same current loop, therefore can not adopt analog shifter method reality
Existing current phase compensate.110kV and following microcomputer transformer differential protection do not adopt analog shifter method to realize electric current at present yet
Phase compensation.Star connection is used using the TA to each side of transformator typically for above-mentioned situation, and uses digit shifter method
Realize current phase compensate.But, tranformer protection manufacturer provides soft just for YNd1, YNd11 and YNyn12 transformator
Part phase-moving method, other transformators cannot be used.Although it is poor on YNd9 transformators that above three patent application can be realized
Dynamic protective current phase compensation, but due to the method using combination of hardware software, it is complex during use.
The content of the invention
Existing digit shifter method cannot be used for above-mentioned YNd3 transformators, differential protection current phase compensate is realized
Problem, the invention provides a kind of YNd3 transformer differential protections current phase compensate method.
The technical scheme that the present invention is provided is as follows：
A kind of YNd9 transformer differential protections Y sidesway phase current phase compensating methods, including：
S1：Obtain YNd9 transformator d sides and participate in the electric current that differential protection is calculated；
S2：The electric current that differential protection is calculated is participated in based on the d sides, differential protection is participated in YNd9 transformator Y sides and is calculated
Electric current carry out phase transition, make Y sides participate in current phase and d sides that differential protection calculates and participate in the electric current that differential protection is calculated
Phase place is consistent, completes current phase compensate.
Further, described in S2 to YNd9 transformator Y sides participate in differential protection calculate electric current carry out phase transition it
It is front also to include：The electric current for participating in differential protection calculating to Y sides carries out current phase compensate.
Further, the electric current for participating in differential protection calculating to Y sides carries out current phase compensate includes：Eliminate zero sequence
Electric current.
Further, described in S2, phase inversion process includes：Backward phase differential current phase shift.
Further, the formula of the backward phase differential current phase shift includes：
Wherein,AndIt is A phases after the current phase compensate of Y sides, B phases and C phase currents respectively；AndIt is the Current Transformer Secondary electric current of access device Y sides A phases, B phases and C phases respectively.
The YNd9 transformer differential protection Y sidesway phase current phase compensating methods that the present invention is provided, can bring following has
Beneficial effect：
In the present invention, carry out participating in poor based on d sides using the electric current for participating in YNd9 transformator Y sides differential protection calculating
The technical scheme of the current phase compensate of the electric current phase shift that dynamic protection is calculated, obtains by digit shifter method, quick, convenient
The technique effect for carrying out current phase compensate to YNd9 transformer differential protections.
In the present invention, current phase compensate is first carried out using the electric current for participating in differential protection calculating to Y sides, then to Y sides
The electric current for participating in differential protection calculating carries out the technical scheme of phase transition, obtains and improves what Y sides participation differential protection was calculated
The technique effect of the degree of accuracy of current phase compensate.
In the present invention, carry out eliminating the technical scheme of zero-sequence current using the electric current for participating in Y sides differential protection calculating,
Obtain the zero-sequence current and the technique effect of misoperation for avoiding transformator from hindering generation for some reason.
In the present invention, using backward phase differential current phase shift, a step completes to eliminate the technology of zero-sequence current and phase transition
Scheme, obtains without the need for individually eliminating zero-sequence current, fast and accurately so that Y sides participate in the current phase that differential protection is calculated
The technique effect consistent with the current phase that d sides participate in differential protection calculating.
Description of the drawings
Below by the way of clearly understandable, preferred implementation is described with reference to the drawings, to above-mentioned characteristic, technical characteristic,
Advantage and its implementation are further described.
Fig. 1 is the flow chart of YNd9 transformer differential protections Y sidesway phase current phase compensating methods of the present invention；
Fig. 2 is a specific embodiment of YNd9 transformer differential protections Y sidesway phase current phase compensating methods of the present invention
Figure；
Fig. 3 is that another of YNd9 transformer differential protections Y sidesway phase current phase compensating methods of the present invention is embodied as
Illustration；
Fig. 4 is the current vector figure that YNd9 transformators d sides of the present invention participate in differential protection；
Fig. 5 is the current vector figure that YNd9 transformators Y sides of the present invention participate in differential protection.
Specific embodiment
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below by control description of the drawings
The specific embodiment of the present invention.It should be evident that drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, can be obtaining other according to these accompanying drawings
Accompanying drawing, and obtain other embodiments.
A kind of YNd9 transformer differential protections Y sidesway phase current phase compensating methods of present invention offer are provided：
S1：Obtain YNd3 transformator d sides and participate in the electric current that differential protection is calculated；
S2：The electric current that differential protection is calculated is participated in based on the d sides, differential protection is participated in YNd9 transformator Y sides and is calculated
Electric current carry out phase transition, make Y sides participate in current phase and d sides that differential protection calculates and participate in the electric current that differential protection is calculated
Phase place is consistent, completes current phase compensate.
In order to adapt to the configuration of main protection back-up protection integration, we are to YNd9 high voltage side of transformer, low-pressure side TA bis-
Secondary winding is connected with star connection.The present invention is carried out using the electric current in YNd9 wiring transformer differential protection Y sidesway phases
Phase compensation, specifically Y sides are participated in the electric current of differential protection calculating and are entered based on the phase place that d sides participate in the electric current that differential protection is calculated
Row digit shifter, obtains the Y side consistent with the current phase that d sides participate in differential protection calculating and participates in the electricity that differential protection is calculated
Stream.As Y side bases carry out current phase compensate in d sides, so, we participate in differential current computing to YNd9 transformator d sides first
Electric current is obtained, and formula is as follows：
Wherein,AndIt is that a phases for participating in differential current computing through the d sides of current phase compensate are electric respectively
Stream, b phase currents and c phase currents；AndIt is the TA secondary currents of d sides a phases, b phases and c phases respectively.
Based on we participate in the current phase that differential protection is calculated by the d sides for obtaining, differential guarantor is participated in the Y sides of YNd9
The current phase that shield is calculated carries out phase transition so that Y sides participate in the current phase of differential protection calculating and d sides participate in differential guarantor
The current phase that shield is calculated is consistent, so far completes the phase compensation of Y sidesway phase currents.
As shown in Fig. 2 a kind of YNd9 transformer differential protections Y sidesway phase currents phase compensation side provided for the present invention
Method.
S1：Obtain YNd9 transformator d sides and participate in the electric current that differential protection is calculated；
S21：The electric current for participating in differential protection calculating to Y sides carries out current phase compensate；
S22：The electric current that differential protection is calculated is participated in based on the d sides for obtaining, to joining through the Y sides of current phase compensate
The electric current calculated with differential protection carries out phase transition, and the current phase and d sides for making Y sides participation differential protection calculating participates in differential
The current phase that protection is calculated is consistent, completes current phase compensate.
In actual transformator use environment, YNd9 transformator Y sides participate in current phase that differential protection calculates can be because
Occur offseting for different situations, and the electric current that the YNd9 transformator Y sides after offseting participate in differential protection calculating can be affected based on d sides
Participate in the degree of accuracy of the current phase compensate that differential protection is calculated.So, we are participating in the electric current that differential protection is calculated to Y sides
Current phase compensate is carried out to Y sides before carrying out phase transition, to ensure the follow-up electric current for participating in differential protection calculating based on d sides
The accuracy of phase compensation.
Zero-sequence current can cause transformator misoperation in differential protection, for avoiding this misoperation, need to participate in poor to Y sides
The electric current that dynamic protection is calculated carries out eliminating zero-sequence current before phase transition.
As shown in figure 3, a kind of YNd9 transformer differential protections Y sidesway phase currents phase compensation side provided for the present invention
Method：
S1：Obtain YNd9 transformator d sides and participate in the electric current that differential protection is calculated；
SS2：The electric current that differential protection is calculated is participated in based on d sides, using backward phase differential current phase shift, differential is participated in Y sides
The electric current that protection is calculated carries out phase transition, makes the current phase that Y sides participation differential protection is calculated participate in differential protection meter with d sides
The current phase of calculation is consistent, completes current phase compensate.
We adopt backward phase differential current phase-moving method, and the electric current for participating in differential protection calculating to Y sides carries out phase transition,
The phase shift of backward phase differential current can adopt below equation：
Wherein,AndIt is A phases after the current phase compensate of Y sides, B phases and C phase currents respectively；AndIt is the Current Transformer Secondary electric current of access device Y sides A phases, B phases and C phases respectively.
As 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, through calculation,
Denominator divided byCan ensure that both members are all identical on direction and amplitude.
Can be seen that from above-mentioned phase transition formula is being carried out in backward phase differential current phase shift calculating process, directly
The zero-sequence current Current Transformer Secondary electric current of Y sides A phases, B phases and C phases that may be present is eliminated.The method is without the need for individually
Step is processed to zero-sequence current, and the Y sides containing zero-sequence current directly can be participated in the phase of the electric current that differential protection is calculated
The phase place that position participates in the electric current that differential protection is calculated with d sides is consistent, and completes current phase compensate with this.
Further, we can be illustrated by vector diagram, be that normal YNd9 transformators d sides participate in shown in Fig. 4
The current vector figure that differential protection is calculated, shown in Fig. 5 is to participate in differential comprising the Y sides after current phase compensate of the present invention
The current vector figure that protection is calculated.As can be seen from Figure 5 through the phase transition of formula (1), (2) and (3), the phase for obtaining
Y sides after the conversion of position are consistent with the current phase of d sides.
Heretofore described YNd9 transformators include the transformator of Yd9 wiring and its wiring combination.
Claims (5)
1. a kind of YNd9 transformer differential protections Y sidesway phase current phase compensating methods, it is characterised in that include：
S1：Obtain YNd9 transformator d sides and participate in the electric current that differential protection is calculated；
S2：The electric current that differential protection is calculated is participated in based on the d sides, the electricity that differential protection is calculated is participated in YNd9 transformator Y sides
Stream carries out phase transition, makes Y sides participate in the current phase that the current phase of differential protection calculating and d sides participate in differential protection calculating
Unanimously, complete current phase compensate.
2. YNd9 transformer differential protections Y sidesway phase current phase compensating methods as claimed in claim 1, it is characterised in that
Also include before phase transition is carried out to the electric current that YNd9 transformator Y sides participation differential protection is calculated described in S2：Y sides are participated in
The electric current that differential protection is calculated carries out current phase compensate.
3. YNd9 transformer differential protections Y sidesway phase current phase compensating methods as claimed in claim 2, it is characterised in that
The electric current for participating in differential protection calculating to Y sides carries out current phase compensate to be included：Eliminate zero-sequence current.
4. YNd9 transformer differential protection current phase software compensation methods as described in arbitrary in claim 1-3, its feature
It is that phase inversion process includes described in S2：Backward phase differential current phase shift.
5. YNd9 transformer differential protections current phase software compensation method as claimed in claim 4, it is characterised in that described
The formula of backward phase differential current phase shift includes：
Wherein,AndIt is A phases after the current phase compensate of Y sides, B phases and C phase currents respectively；AndIt is the Current Transformer Secondary electric current of access device Y sides A phases, B phases and C phases respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611026056.XA CN106532643A (en) | 2016-11-22 | 2016-11-22 | Differential protection Y-side phase-shift current phase compensation method of YNd9 transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611026056.XA CN106532643A (en) | 2016-11-22 | 2016-11-22 | Differential protection Y-side phase-shift current phase compensation method of YNd9 transformer |
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| Publication Number | Publication Date |
|---|---|
| CN106532643A true CN106532643A (en) | 2017-03-22 |
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| CN201611026056.XA Pending CN106532643A (en) | 2016-11-22 | 2016-11-22 | Differential protection Y-side phase-shift current phase compensation method of YNd9 transformer |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248009A (en) * | 2013-05-20 | 2013-08-14 | 国家电网公司 | Longitudinal differential protection current phase compensation method for YNd5 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 |
| WO2016074742A1 (en) * | 2014-11-14 | 2016-05-19 | Siemens Aktiengesellschaft | Differential protection method and differential protection device for performing a differential protection method |
-
2016
- 2016-11-22 CN CN201611026056.XA patent/CN106532643A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248009A (en) * | 2013-05-20 | 2013-08-14 | 国家电网公司 | Longitudinal differential protection current phase compensation method for YNd5 transformer |
| WO2016074742A1 (en) * | 2014-11-14 | 2016-05-19 | Siemens Aktiengesellschaft | Differential protection method and differential protection device for performing a differential protection 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 |
Non-Patent Citations (1)
| Title |
|---|
| 毕大强等: "变压器差动保护中电流相位补偿方式的分析", 《电力系统自动化》 * |
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