CN106786376B - The compensation method counterclockwise of transformer differential protection high-pressure side positive sequence negative phase-sequence clockwise - Google Patents
The compensation method counterclockwise of transformer differential protection high-pressure side positive sequence negative phase-sequence clockwise Download PDFInfo
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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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Abstract
The invention discloses a kind of compensation methodes counterclockwise of transformer differential protection high-pressure side positive sequence negative phase-sequence clockwise, for all 12 kinds of wiring group transformer differential protections, low-pressure side uses and eliminates zero-sequence current in phase current, high-pressure side A phase, B phase, C phase decomposition is forward-order current and negative-sequence current, it is automatic to eliminate zero-sequence current, on the basis of each phase current of positive sequence is high-pressure side, it rotates clockwise consistent with each phase current phase of low-pressure side behind n × 30 °, on the basis of each phase current of negative phase-sequence is high-pressure side, it is consistent with each phase current phase of low-pressure side behind rotation n × 30 ° counterclockwise, forward-order current and each phase current in high-pressure side of negative-sequence current synthesis are consistent with each phase current phase of low-pressure side.The present invention is suitable for the transformer longitudinal linked differential protection device of high voltage side of transformer 1-12 point any combination wiring group, to comply fully with the requirement of transformer differential protection current phase compensate.
Description
Technical Field
The invention relates to a fully-wired transformer, in particular to a fully-wired transformer differential protection high-voltage side positive sequence clockwise negative sequence anticlockwise phase compensation method, and belongs to a relay protection control technology of an electric power transmission and distribution network.
Background
Since the phases of the currents on the sides of the transformer may be different, the longitudinal differential protection of the transformer (hereinafter referred to as the differential protection of the transformer) needs to perform current phase compensation. The method for compensating the phase of the differential protection current of the transformer has two methods: 1. traditional hardware phase shifting: for example, a secondary winding of a current transformer TA at the Y side of the YNd11 transformer adopts a triangular d-11 wiring, and a secondary winding of a current transformer TA at the d side adopts a star-shaped Y-12 wiring; 2. software phase shifting: namely, the phase compensation is completed by using a software program and a calculation formula to carry out current phase shifting. At present, 220kV and above transformer protection is generally designed and configured doubly for main protection backup protection in an integrated mode, the main protection backup protection in the integrated mode is that the main protection and all backup protection use the same hardware and software in one case, and current and voltage of each side of the main protection backup protection of the transformer adopt the same set of secondary windings of a current transformer TA and a voltage transformer. Because the protection current loop of the main protection backup protection integrated transformer adopts the same current loop, the traditional hardware phase shift can not be adopted for carrying out current phase compensation, and therefore the current transformers TA at all sides of the transformer need to adopt a star connection method and adopt current software phase shift for carrying out phase compensation. The differential protection of the microcomputer transformer of 110kV and below does not adopt the traditional hardware phase shift to carry out current phase compensation at present, the current mutual inductor TA at each side generally adopts a star connection method, adopts the current software phase compensation of the differential protection, and gradually transits to the integrated design and double-set configuration of the main protection backup protection. However, currently, each transformer protection manufacturer only designs a plurality of transformer connection group types of YNd11, YNd1 and YNyn12 and a connection combination differential protection current software phase compensation method thereof, and does not design a transformer differential protection current software phase compensation method in other connection group types and connection combination modes. The invention provides a technical scheme for counterclockwise software phase compensation of positive sequence current clockwise and negative sequence current of a high-voltage side of differential protection of a full-wiring transformer.
Disclosure of Invention
The invention aims to provide a method for counterclockwise compensating a positive sequence, a negative sequence and a clockwise sequence of a high-voltage side of differential protection of a transformer, which is applied to main transformers of various voltage grades of a substation with various voltage grades of a power transmission and distribution network, is applied to current software phase compensation of a differential protection device of a fully-connected transformer, is suitable for a longitudinal differential protection device of the transformer with 1-12 points at the low-voltage side of the transformer arbitrarily combined wiring group, and completely meets the requirement of the phase compensation of the current of the differential protection of the transformer.
The purpose of the invention is realized by the following technical scheme:
a method for counterclockwise compensation of a positive sequence, a clockwise negative sequence and a high-voltage side of differential protection of a transformer comprises the following steps:
step 1: connecting the secondary windings of a current transformer TA at the high-voltage side and the low-voltage side of the transformer into a star connection method;
step 2: taking TA secondary currents of a phase, b phase and c phase at the low-voltage side as reference, for the low-voltage side, zero sequence current needs to be eliminatedInfluence on differential protection, so phase-a current involved in differential protection differential current calculationPhase b currentc phase currentRespectively as follows:
(1-3) in the formulaThe phase a current, the phase b current and the phase c current participate in differential current calculation for the low-voltage side of the device;TA secondary currents of a phase, b phase and c phase which are connected to the low-voltage side of the device are switched in; wherein,
and step 3: the secondary currents of the high-voltage side phases A, B and C are matched with the secondary currents of the low-voltage side phases a, B and CPerforming phase shift on the same phase principle;
firstly, decomposing a phase A, a phase B and a phase C on a high-voltage side into a positive sequence current and a negative sequence current, wherein the positive sequence current is as follows:
the negative sequence currents are respectively:
(4-9) formula (II)For switching in TA secondary current of A phase, B phase and C phase at high voltage side of the device, a ═ ej120°Is a twiddle factor;
phase-A current participating in differential protection differential current calculationB phase flowAnd C phase currentThe phase shift is performed according to the following formula:
(10-12) wherein n is the number of clock points of the transformer terminal group of 1-12.
The object of the invention can be further achieved by the following technical measures:
the positive sequence clockwise negative sequence anticlockwise compensation method for the differential protection high-voltage side of the transformer can be applied to a full-wiring transformer.
The positive sequence clockwise negative sequence anticlockwise compensation method for the transformer differential protection high-voltage side is applied to a microcomputer type transformer differential protection device.
The positive sequence clockwise negative sequence anticlockwise compensation method for the transformer differential protection high-voltage side is applied to a PLC type transformer differential protection device.
According to the counter-clockwise compensation method for the positive sequence, the negative sequence and the positive sequence of the differential protection high-voltage side of the transformer, the TA model of the current transformer is LJZ series.
Compared with the prior art, the invention has the beneficial effects that: 1. the device is suitable for the current phase compensation of the longitudinal differential protection devices of all the wiring transformers of various voltage grades of a transmission and distribution network substation; 2. the current software phase compensation scheme of the fully-wired transformer differential protection device is simple and clear and is easy to realize; 3. the current software phase compensation scheme of the fully-connected transformer differential protection device is suitable for the current software phase compensation of the transformer longitudinal differential protection device of the arbitrary combination connection group of 1-12 points on the high-voltage side of the transformer.
Drawings
FIG. 1 is a wiring diagram of a 1-12 terminal group transformer of the present invention;
FIG. 2 is a vector diagram of current software compensation on both sides of a YNd1 wiring transformer of the present invention, wherein (a) is the high voltage side and (b) is the low voltage side;
FIG. 3 is a vector diagram of the YNy2 junction transformer with software compensation of current on both sides, where (a) is the high side and (b) is the low side, according to the present invention;
FIG. 4 is a vector diagram of current software compensation across the YNd3 wire-connected transformer of the present invention, where (a) is the high voltage side and (b) is the low voltage side;
FIG. 5 is a vector diagram of the YNy4 junction transformer with software compensation of current on both sides, where (a) is the high side and (b) is the low side, according to the present invention;
FIG. 6 is a vector diagram of current software compensation on both sides of the YNd5 wiring transformer of the present invention, wherein (a) is the high voltage side and (b) is the low voltage side;
FIG. 7 is a vector diagram of the YNy6 junction transformer with current software compensation on both sides, with (a) being the high side and (b) being the low side, according to the present invention;
FIG. 8 is a vector diagram of current software compensation across the YNd7 wire-connected transformer of the present invention, where (a) is the high voltage side and (b) is the low voltage side;
FIG. 9 is a vector diagram of the YNy8 junction transformer with current software compensation on both sides, with (a) being the high side and (b) being the low side, according to the present invention;
FIG. 10 is a vector diagram of the YNd9 wired transformer of the present invention after software compensation of current on both sides, where (a) is the high voltage side and (b) is the low voltage side;
FIG. 11 is a vector diagram of the YNy10 junction transformer with current software compensation on both sides, with (a) being the high side and (b) being the low side, according to the present invention;
FIG. 12 is a vector diagram of current software compensation across the YNd11 wire-connected transformer of the present invention, with (a) being the high side and (b) being the low side;
FIG. 13 is a vector diagram of the YNy12 junction transformer with current software compensation on both sides, with (a) being the high side and (b) being the low side, according to the present invention;
FIG. 14 is a flow chart of the method for compensating the positive sequence, the clockwise negative sequence and the counterclockwise direction of the high voltage side of the differential protection of the transformer.
Detailed Description
The invention is further described with reference to the following figures and specific examples. Because microcomputer transformer protection is generally integrated design and dual configuration of main protection backup protection, transformer differential protection requires that the secondary windings of the current transformers TA on the high-voltage side and the low-voltage side of the transformer of any wiring group are connected in a star connection mode.
The invention discloses a method for counterclockwise compensating a positive sequence, a negative sequence and a clockwise sequence of a high-voltage side of differential protection of a transformer, which comprises the following steps as shown in figure 14:
step 1: connecting the secondary windings of a current transformer TA at the high-voltage side and the low-voltage side of the transformer into a star connection method;
step 2: taking TA secondary currents of a phase, b phase and c phase at the low-voltage side as reference, for the low-voltage side, zero sequence current needs to be eliminatedInfluence on differential protection, so phase-a current involved in differential protection differential current calculationPhase b currentc phase currentRespectively as follows:
(1-3) in the formulaThe phase a current, the phase b current and the phase c current participate in differential current calculation for the low-voltage side of the device;TA secondary currents of a phase, b phase and c phase which are connected to the low-voltage side of the device are switched in; wherein,
and step 3: the secondary currents of the high-voltage side phases A, B and C are matched with the secondary currents of the low-voltage side phases a, B and CPerforming phase shift on the same phase principle;
firstly, decomposing a phase A, a phase B and a phase C on a high-voltage side into a positive sequence current and a negative sequence current, wherein the positive sequence current is as follows:
the negative sequence currents are respectively:
(4-9) formula (II)For switching in TA secondary current of A phase, B phase and C phase at high voltage side of the device, a ═ ej120°Is a twiddle factor;
phase-A current participating in differential protection differential current calculationB phase flowAnd C phase currentThe phase shift is performed according to the following formula:
(10-12) wherein n is the number of clock points of the transformer terminal group of 1-12.
Through the phase conversion, the high-voltage side and the low-voltage side of the transformer of any wiring group participate in the A-phase current calculated by the differential protection phase difference currentPhase a currentPhase-consistent, B-phase currentFlow with phase bPhase-consistent, C-phase currentPhase c currentThe phases are consistent.
In the step 2, for all 12 types of wiring group transformer differential protection, the low-voltage side adopts the mode of eliminating zero sequence current in phase current to prevent the transformer differential protection from misoperation caused by the influence of the zero sequence current. The significance of the formula (1-3) is that the low-voltage side is regarded as 12 points of the wiring group, and phase compensation is carried out according to the current phase compensation method of the microcomputer transformer differential protection software with 12 points of the wiring group.
In the step 3, for all 12 types of wiring group transformer differential protection, the high-voltage side of the transformer adopts the high-voltage side A phase, B phase and C phase to be decomposed into positive sequence current and negative sequence current, and the zero sequence current is automatically eliminated, so that the misoperation of the transformer differential protection caused by the influence of the zero sequence current is prevented.
In the step 2 and the step 3, for differential protection of all 12 types of wiring group transformers, the phase compensation adopts a method of shifting the phase of the high-voltage side by taking the low-voltage side as a reference. In the step 3, for all 12 types of terminal group transformer differential protection, the formula (10-12) is a general phase shifting formula for the current phase compensation of the 12 types of terminal group microcomputer transformer differential protection software.
The physical significance of the formula (10-12) in the step 3 is that (1) the positive sequence current is based on the high-voltage side and is consistent with the phase of the current on the low-voltage side after being rotated by n multiplied by 30 degrees clockwise, wherein n is 1-12 of the transformer terminal group, (2) the negative sequence current is based on the high-voltage side and is consistent with the phase of the current on the low-voltage side after being rotated by n multiplied by 30 degrees counterclockwise, and n is 1-12 of the transformer terminal group; (3) the phase of each phase current on the high-voltage side and that on the low-voltage side, which are synthesized by the positive sequence current and the negative sequence current, are consistent.
Fig. 1 shows a wiring diagram of a 1-12 wiring-group transformer of the present invention. In which fig. 1(a) is an YNd1 connection, fig. 1(b) is a YNy2 connection, fig. 1(c) is an YNd3 connection, fig. 1(d) is a YNy4 connection, fig. 1(e) is an YNd5 connection, fig. 1(f) is a YNy6 connection, fig. 1(g) is an YNd7 connection, fig. 1(h) is a YNy8 connection, fig. 1(i) is an YNd9 connection, fig. 1(j) is an YNy10 connection, fig. 1(k) is an YNd11 connection, and fig. 1(l) is a YNy12 connection.
The derivation process of the general phase-shifting formula for the current phase compensation of the 12 wiring group microcomputer transformer differential protection software is as follows:
1) yd1 wiring transformer
For the high-voltage side, according to the phase-shift vector diagram shown in fig. 2, the phase a current for obtaining the high-voltage side access differential protection is:
in the same way
2) Yy2 (including YNyn 2) wiring transformer
For the low-voltage side, because the negative C-phase current of the high-voltage side is in phase with the a-phase current of the low-voltage side, the a-phase current of the high-voltage side connected to the differential protection needs to be phase-shifted according to the negative C-phase current, and zero-sequence current needs to be eliminated, and vector diagram is shown in fig. 3, so the a-phase current of the low-voltage side connected to the differential protection is:
in the same way
3) Yd3 transformer
For the high-voltage side, according to the phase-shift vector diagram shown in fig. 4, the phase a current obtained by connecting the high-voltage side to the differential protection is:
in the same way
4) Yy4 (including YNyn 4)
For the high-voltage side, because the phase B current of the high-voltage side is in phase with the phase a current of the low-voltage side, the phase a current of the high-voltage side connected to the differential protection needs to be shifted according to the phase B current, and zero sequence current needs to be eliminated, and vector diagram is shown in fig. 5, so the phase a current of the low-voltage side connected to the differential protection is:
in the same way
5) Yd5 wiring transformer
For the high-voltage side, according to the phase-shift vector diagram shown in fig. 6, the phase a current for obtaining the high-voltage side access differential protection is:
in the same way
6) Yy6 (including YNyn 6) wiring transformer
For the high-voltage side, because the high-voltage side negative a-phase current is in phase with the low-voltage side a-phase current, the phase of the a-phase current accessed to the differential protection at the high-voltage side needs to be shifted according to the negative a-phase current at the high-voltage side, and zero-sequence current needs to be eliminated, and the vector diagram is shown in fig. 7, so the a-phase current accessed to the differential protection at the low-voltage side is:
in the same way
7) Yd7 wiring transformer
For the high-voltage side, according to the phase-shift vector diagram shown in fig. 8, the phase a current for obtaining the high-voltage side access differential protection is:
in the same way
8) Yy8 (including YNyn 8) wiring transformer
For the high-voltage side, because the phase C current of the high-voltage side is in phase with the phase a current of the low-voltage side, the phase a current of the high-voltage side connected to the differential protection needs to be shifted according to the phase C current, and zero sequence current needs to be eliminated, and the vector diagram is shown in fig. 9, so the phase a current of the low-voltage side connected to the differential protection is:
in the same way
9) Yd9 wiring transformer
For the high-voltage side, according to the phase-shift vector diagram shown in fig. 10, the a-phase current for obtaining the high-voltage side access differential protection is:
in the same way
10) Yy10 (including YNyn 10) wiring transformer
For the high-voltage side, because the negative B-phase current of the high-voltage side is in phase with the a-phase current of the low-voltage side, the a-phase current of the high-voltage side connected to the differential protection needs to be phase-shifted according to the negative B-phase current, and zero-sequence current needs to be eliminated, and the vector diagram is shown in fig. 11, so that the following steps are provided:
in the same way
11) Yd11 wiring transformer
For the high-voltage side, according to the phase-shift vector diagram shown in fig. 6, the phase a current for obtaining the high-voltage side access differential protection is:
in the same way
12) Yy12 (including YNyn 12) wiring transformer
For the high-voltage side, because the phase a current of the high-voltage side is in phase with the phase a current of the low-voltage side, the phase a current of the high-voltage side connected to the differential protection needs to be shifted according to the phase a current, and zero sequence current needs to be eliminated, and a vector diagram is shown in fig. 13, so the phase a current of the high-voltage side connected to the differential protection is:
in the same way
(4) General phase shift formula
From the above analysis, a general phase shift formula can be obtained, and low-pressure side phase shift is adopted.
1) For the low-voltage side, because zero sequence current is to be eliminated, there are:
2) for the high-pressure side, there is a general phase-shifting formula
(50-60) wherein n is the number of clock points of the transformer terminal group of 1-12.
The invention relates to a method for counterclockwise compensating a positive sequence, a negative sequence and a positive sequence of a differential protection high-voltage side of a transformer, which is applied to a microcomputer type transformer differential protection device or a PLC type transformer differential protection device.
In addition to the above embodiments, the present invention may have other embodiments, and any technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of the claims of the present invention.
Claims (5)
1. A method for compensating a positive sequence, a clockwise sequence, a negative sequence and a counterclockwise sequence of a high-voltage side of differential protection of a transformer is characterized by comprising the following steps:
step 1: connecting the secondary windings of a current transformer TA at the high-voltage side and the low-voltage side of the transformer into a star connection method;
step 2: taking TA secondary currents of a phase, b phase and c phase at the low-voltage side as reference, for the low-voltage side, zero sequence current needs to be eliminatedInfluence on differential protection, so phase-a current involved in differential protection differential current calculationPhase b currentc phase currentRespectively as follows:
(1-3) in the formulaThe phase a current, the phase b current and the phase c current participate in differential current calculation for the low-voltage side of the device;TA secondary currents of a phase, b phase and c phase which are connected to the low-voltage side of the device are switched in; wherein,
and step 3: the TA secondary currents of the high-voltage side A phase, B phase and C phase are matched with the TA secondary currents of the low-voltage side a phase, B phase and C phasePerforming phase shift on the same phase principle;
firstly, decomposing the phase A current, the phase B current and the phase C current of a high-voltage side into a positive sequence current and a negative sequence current, wherein the positive sequence current is as follows:
the negative sequence currents are respectively:
(4-9) formula (II)For switching in TA secondary current of A phase, B phase and C phase at high voltage side of the device, a ═ ej120°Is a twiddle factor;
phase-A current participating in differential protection differential current calculationB phase flowAnd C phase currentThe phase shift is performed according to the following formula:
(10-12) wherein n is the number of clock points of the transformer terminal group of 1-12.
2. The method for the positive sequence, clockwise negative sequence and counterclockwise compensation of the high voltage side of the differential protection of the transformer as claimed in claim 1, wherein the method is applicable to a fully wired transformer.
3. The method for the positive sequence clockwise negative sequence counterclockwise compensation of the high-voltage side of the transformer differential protection according to claim 1, wherein the method is applied to a microcomputer type transformer differential protection device.
4. The method for the positive sequence, clockwise negative sequence and counterclockwise compensation of the high voltage side of the transformer differential protection according to claim 1, wherein the method is applied to a PLC type transformer differential protection device.
5. The method for the positive sequence, the clockwise negative sequence and the counterclockwise compensation of the high voltage side of the differential protection of the transformer as claimed in claim 1, wherein the TA model of the current transformer is LJZ series.
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| WO2005078885A1 (en) * | 2004-02-13 | 2005-08-25 | Zhejiang University | Method for preventing mal-operation of transformer differential protection |
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| CN103248008A (en) * | 2013-05-20 | 2013-08-14 | 国家电网公司 | Longitudinal differential protection current phase compensation method for YNd7 transformer |
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