CN104167715A - YNd5 transformer longitudinal differential protection current phase compensation method - Google Patents

Abstract

The invention belongs to the relay protection control technology of electric power transmission and distribution networks, and relates to a YNd5 transformer longitudinal differential protection current phase compensation method. The method comprises the steps that YNd5 wiring transformer d-side b-phase TA secondary winding current is connected into a YNd11 wiring microcomputer transformer differential protection d-side a-phase current loop; YNd5 wiring transformer d-side a-phase TA secondary winding current is connected into a YNd11 wiring microcomputer transformer differential protection d-side b-phase current loop; YNd5 wiring transformer d-side c-phase TA secondary winding current is connected into a YNd11 wiring microcomputer transformer differential protection d-side c-phase current loop; software phase compensation of a YNd11 wiring microcomputer transformer differential protection device is utilized for carrying out phase compensation on YNd5 wiring transformer differential protection. The YNd5 transformer longitudinal differential protection current phase compensation method can complete current phase compensation for YNd5 wiring transformer differential protection, and is simple in principle and convenient to implement.

Description

The compensation method of YNd5 transformer longitudinal linked differential protection current phase

Technical field

The invention belongs to the relay protection and control technology of power transmission and distribution network, relate to a kind of method of YNd5 transformer longitudinal linked differential protection current phase compensation.

Background technology

Because each side electric current possibility phase place of transformer is inconsistent, so transformer longitudinal linked differential protection (hereinafter to be referred as transformer differential protection) will carry out current phase compensation.The method of transformer differential protection current phase compensation has two kinds: 1, traditional analog shifter: such as YNd11 transformer Y side current transformer (hereinafter to be referred as TA) secondary winding adopts triangle d-11 wiring, d side TA secondary winding, adopt star Y-12 wiring; 2, software phase shift: utilize software program and computing formula to carry out electric current phase shift and complete phase compensation.At present; 220kV and above tranformer protection are generally main protection backup protection integrated design, dual configuration; main protection backup protection integrated design is main protection and all backup protections are all used same hardware and software in a cabinet, and the electric current of the every side of transformer main protection backup protection, voltage are all to adopt TA, same group of secondary winding of voltage transformer.Because main protection backup protection integrated transformer protective current loop is the same current circuit adopting; therefore can not adopt traditional analog shifter to carry out current phase compensation; therefore the TA of each side of transformer must adopt wye connection, adopts the phase shift of electric current software to carry out phase compensation.110kV and following microcomputer transformer differential protection do not adopt traditional analog shifter to carry out current phase compensation at present yet; the TA of each side generally also adopts wye connection; also adopt the electric current software phase compensation of differential protection, and progressively to main protection backup protection integrated design, two coverization configuration transition.But each tranformer protection manufacturer differential protection electric current software phase compensating method is only developed several conventional transformer connection groups conventionally at present, and such as YNd11 wiring group and wiring combination thereof etc., can not adapt to other wiring groups and wiring compound mode.

Summary of the invention

Problem to be solved by this invention is; provide a kind of and can utilize YNd11 transformer differential protection electric current software Phase Compensation System; complete various electric pressure transformers and be the current phase compensation of YNd5 wiring (containing Yd5 wiring) transformer differential protection, and principle is simple, the method for implementing YNd5 transformer longitudinal linked differential protection current phase compensation convenient, that meet transformer differential protection current phase compensation principle.

YNd5 transformer differential protection current phase of the present invention compensation method is:

YNd5 high voltage side of transformer, low-pressure side TA secondary winding all connect as wye connection; YNd5 transformer Y side TA secondary winding A phase current, B phase current, C phase current are accessed respectively to A phase current, B phase current, the C phase current loop of YNd11 differential protective device of transformer; The concrete grammar of each phase current access of YNd5 transformer d side TA secondary winding YNd11 wiring microcomputer transformer differential protection is as follows:

(1) by a phase current loop of YNd5 wiring transformer d side b phase TA secondary winding electric current access YNd11 wiring microcomputer transformer differential protection d side;

(2) by the b phase current loop of YNd5 wiring transformer d side a phase TA secondary winding electric current access YNd11 wiring microcomputer transformer differential protection d side;

(3) by the c phase current loop of YNd5 wiring transformer d side c phase TA secondary winding electric current access YNd11 wiring microcomputer transformer differential protection d side;

(4) utilize the software phase compensation of YNd11 wiring microcomputer transformer differential protection, YNd5 wiring transformer differential protection is carried out to phase compensation.

The transformer longitudinal linked differential protection basic principle that the method for the phase compensation of YNd5 wiring transformer longitudinal differential protection electric current of the present invention meets completely, compares with the method for using in existing based Transformer differential protection, and tool has the following advantages:

1, be applicable to the current phase compensation technique scheme of the various electric pressure transformer longitudinal of the YNd5 of transmission and distribution networks electric substation wiring linked differential protection device.

2, by the conversion of each phase current of access transformer longitudinal linked differential protection device, YNd5 wiring transformer differential protection is converted to YNd11 wiring transformer differential protection, recycle the current phase compensation scheme of existing YNd11 microcomputer transformer differential protection, realized the current phase compensation scheme of all YNd5 wiring transformer longitudinal differential protection devices, simple and practical, secondary circuit is changed little, easily realizes;

3, the current phase compensation scheme of YNd5 wiring transformer longitudinal differential protection device does not need to change the current phase compensation scheme of existing YNd11 microcomputer transformer longitudinal differential protection device inside.

Accompanying drawing explanation

Fig. 1 is YNd5 transformer connection figure corresponding to the inventive method;

Fig. 2 is YNd11 depressor corresponding to the inventive method and YNd5 transformer connection graph of a relation;

Fig. 3 is the YNd5 transformer differential protection current phase compensation principle figure of the inventive method.

Embodiment

1, the phase relation of YNd11 wiring transformer and YNd5 series wiring transformer

Fig. 1 is shown in by YNd5 wiring transformer winding diagram.Because YNd5 high voltage side of transformer, low-pressure side three-phase voltage are all symmetrical, therefore as long as take out 1 line voltage ratio, so have in advance 150 degree.YNd11 wiring transformer winding diagram is shown in Fig. 2 (a), in like manner YNd11 transformer lag behind 30 degree.We are YNd11 transformer with YNd5 transformer think and compare YNd11 transformer and YNd5 step down side by homophase between relation.And YNd5 step down side in Fig. 1, be the voltage of low pressure b winding in B phase iron core column in Fig. 2 (a), we also can find the voltage of low pressure b winding in B phase iron core column (regard as and be equivalent to YNd5 step down side ), the lead-out wire pile crown that the lead-out wire pile crown of the head " b " of Fig. 2 (a) mesolow b winding is labeled as to " a ", tail " y " is labeled as " b ", and another remaining lead-out wire pile crown note is for " c ", so obtain Fig. 2 (b); Analysis chart 2 (b) obtains another kind of YNd5 wiring transformer winding diagram.Be that the d side phase relation of YNd11 wiring transformer and YNd5 wiring transformer is as table 1.

The d side phase relation contrast table of table 1, YNd11 wiring transformer and YNd5 series wiring transformer

2, YNd5 transformer current software phase compensating method

YNd11 wiring transformer differential protection, manufactory has realized transformer differential protection electric current software compensation in protection equipment for transformer.Require YNd5 serial transformer high-pressure side, low-pressure side TA secondary winding all to connect as wye connection.

YNd11 wiring transformer d side winding and each phase current relation of YNd5 wiring transformer d side winding in comparison sheet 1 (think YNd11 and each phase current homophase of YNd5 wiring transformer Y side winding); be not difficult to find b phase current, a phase current, the c phase current same-phase of a phase current, b phase current, c phase current and the YNd5 wiring transformer d side winding of YNd11 wiring transformer d side winding; therefore, draw the compensation method of YNd5 wiring transformer differential protection current phase:

(1) each phase current of each phase current access of this YNd5 transformer Y side TA secondary winding YNd11 wiring transformer differential protection is constant, and YNd5 transformer Y side TA secondary winding A phase current, B phase current, C phase current access respectively A phase current, B phase current, the C phase current of YNd11 transformer differential protection.

(2) each phase current of this YNd5 transformer of access YNd11 wiring transformer differential protection d side TA secondary winding is: by the c phase current loop of the b phase current loop of a phase current loop of the b phase TA secondary winding electric current access YNd11 wiring microcomputer transformer differential protection d side of YNd5 wiring transformer d side, a phase TA secondary winding electric current access YNd11 wiring microcomputer transformer differential protection d side, c phase TA secondary winding electric current access YNd11 wiring microcomputer transformer differential protection d side.

(3) by this conversion, YNd5 wiring transformer differential protection has just changed YNd11 wiring transformer differential protection into; Recycle the electric current software phase compensation of YNd11 wiring microcomputer transformer differential protection, thereby finally realized the current phase compensation of YNd5 wiring transformer differential protection.Fig. 3 is shown in concrete wiring.

Claims (1)

1. a YNd5 transformer differential protection current phase compensation method, is characterized in that:

YNd5 high voltage side of transformer, low-pressure side TA secondary winding all connect as wye connection; YNd5 transformer Y side TA secondary winding A phase current, B phase current, C phase current are accessed respectively to A phase current, B phase current, the C phase current loop of YNd11 differential protective device of transformer; The concrete grammar of each phase current access of YNd5 transformer d side TA secondary winding YNd11 wiring microcomputer transformer differential protection is as follows:

(1) by a phase current loop of YNd5 wiring transformer d side b phase TA secondary winding electric current access YNd11 wiring microcomputer transformer differential protection d side;

(2) by the b phase current loop of YNd5 wiring transformer d side a phase TA secondary winding electric current access YNd11 wiring microcomputer transformer differential protection d side;

(3) by the c phase current loop of YNd5 wiring transformer d side c phase TA secondary winding electric current access YNd11 wiring microcomputer transformer differential protection d side;

(4) utilize the software phase compensation of YNd11 wiring microcomputer transformer differential protection, YNd5 wiring transformer differential protection is carried out to phase compensation.