CN104269826A - Longitudinal differential protection current phase compensation method for wiring transformer YNd3 - Google Patents

Abstract

The invention belongs to the technology of relay protection control of electric power transmission and distribution networks and relates to a longitudinal differential protection current phase compensation method for a wiring transformer YNd3. The method comprises the steps that an a-phase current of a secondary winding TA on the side d of the wiring transformer YNd3 is connected into an a-phase current circuit on the side d of a wiring microcomputer transformer differential protective device YNd1; a c-phase current of the secondary winding TA on the side d of the wiring transformer YNd3 is connected into a b-phase current circuit on the side d of the wiring microcomputer transformer differential protective device YNd1; a b-phase current of the secondary winding TA on the side d of the wiring transformer YNd3 is connected into a c-phase current circuit on the side d of the wiring microcomputer transformer differential protective device YNd1; phase compensation is conducted on a differential protective device of the wiring transformer YNd3 according to software phase compensation of the wiring microcomputer transformer differential protective device YNd1. By means of the method, current phase compensation of the differential protective device of the wiring transformer YNd3 can be completed; moreover, the method is simple in principle and convenient to implement.

Description

The compensation method of YNd3 wiring transformer longitudinal differential protection current phase

Technical field

The invention belongs to the relay protection and control technology of electrical power distribution electric network, relate to a kind of method that YNd3 wiring transformer longitudinal differential protection current phase compensates.

Background technology

Because transformer each side electric current possibility phase place is inconsistent, therefore transformer longitudinal linked differential protection (hereinafter referred to as transformer differential protection) will carry out current phase compensation.The method that transformer differential protection current phase compensates has two kinds: 1, traditional analog shifter: such as YNd11 transformer Y side current transformer (hereinafter referred to as TA) secondary winding adopts triangle d-11 wiring, d side TA secondary winding adopts star Y-12 wiring; 2, digit shifter: namely utilize software program and computing formula to carry out electric current phase shift to complete phase compensation.At present; 220kV and above tranformer protection are generally main protection backup protection integrated design, duplicate system retrofit; main protection backup protection integrated design is main protection and all backup protections all use same hardware and software in a cabinet, and the electric current of the every side of transformer main protection backup protection, voltage are all adopt TA, voltage transformer same group of secondary winding.Because main protection backup protection integrated transformer protective current loop is the same current circuit adopted; therefore traditional analog shifter can not be adopted to carry out current phase compensation; therefore the TA of each side of transformer must adopt wye connection, adopts electric current digit shifter 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 the electric current software phase compensation of differential protection is adopted, and progressively to main protection backup protection integrated design, two coverization configuration transition.Such as, but current each tranformer protection manufacturer differential protection electric current software phase compensating method only develops several conventional transformer connection group usually, and YNd1 wiring group and wiring combination etc. thereof, can not adapt to other wiring groups and wiring compound mode.

Summary of the invention

Problem to be solved by this invention is; there is provided one can utilize YNd1 transformer differential protection electric current software Phase Compensation System; complete the current phase compensation that various electric pressure transformer is YNd3 wiring (containing Yd3 wiring) transformer differential protection, and the method that principle YNd3 transformer longitudinal linked differential protection current phase that is simple, that implement conveniently, meet transformer differential protection current phase compensation principle compensates.

YNd3 transformer differential protection current phase of the present invention compensation method is:

YNd3 high voltage side of transformer, low-pressure side TA secondary winding all connect as wye connection, and this YNd3 transformer Y side TA secondary winding A phase current, B phase current, C phase current access the A phase current of YNd1 transformer differential protection, B phase current, C phase current loop respectively; The concrete grammar of YNd3 transformer d side TA secondary winding each phase current access YNd1 wiring microcomputer transformer differential protection is as follows:

(1) by a phase current loop of YNd3 wiring transformer d side a phase TA secondary winding electric current access YNd1 wiring microcomputer transformer differential protection d side;

(2) by the b phase current loop of YNd3 wiring transformer d side c phase TA secondary winding electric current access YNd1 wiring microcomputer transformer differential protection d side;

(3) by the c phase current loop of YNd3 wiring transformer d side b phase TA secondary winding electric current access YNd1 wiring microcomputer transformer differential protection d side;

(4) utilize the software phase compensation of YNd1 wiring microcomputer transformer differential protection, phase compensation is carried out to YNd3 wiring transformer differential protection.

The transformer longitudinal linked differential protection general principle that the method for the phase compensation of YNd3 wiring transformer longitudinal differential protection electric current of the present invention meets completely, compared with the method used in existing based Transformer differential protection, tool has the following advantages:

1, the current phase compensation technique scheme of transmission and distribution networks electric substation YNd3 wiring various electric pressure transformer longitudinal linked differential protection device is applicable to.

2, by the conversion of each phase current of access transformer longitudinal linked differential protection device, YNd3 wiring transformer differential protection is converted to YNd1 wiring transformer differential protection, recycle the current phase compensation scheme of existing YNd1 microcomputer transformer differential protection, achieve the current phase compensation scheme of all YNd3 wiring transformer longitudinal differential protection devices, simple and practical, secondary circuit is changed little, easily realizes;

3, the current phase compensation scheme of YNd3 wiring transformer longitudinal differential protection device does not need the current phase compensation scheme changing existing YNd1 microcomputer transformer longitudinal differential protection device inside.

Accompanying drawing explanation

Fig. 1 is YNd3 transformer connection figure corresponding to the inventive method;

Fig. 2 is YNd1 transformer corresponding to the inventive method and YNd3 transformer connection graph of a relation.

Fig. 3 is the YNd3 transformer differential protection current phase compensation principle figure of the inventive method.

Specific embodiments

1, the phase relation of YNd3 wiring transformer and YNd1 series wiring transformer

Fig. 1 is shown in by YNd3 wiring transformer winding diagram.Because YNd3 high voltage side of transformer, low-pressure side three-phase voltage are all symmetrical, as long as therefore take out 1 line voltage compare, so have in advance 90 degree.YNd1 wiring transformer winding diagram is shown in Fig. 2 a), in like manner YNd1 transformer in advance degree.We are YNd3 transformer with YNd1 transformer think and compare YNd1 transformer and YNd3 step down side by homophase between relation.And YNd3 step down side in Fig. 1 for the voltage of low pressure c winding in C phase iron core column fig. 2 a) in we also can find the voltage of low pressure c winding in C phase iron core column (regard as and be equivalent to YNd3 step down side ), the lead-out wire pile crown of Fig. 2 a) tail " z " of mesolow c winding is labeled as " a ", the lead-out wire pile crown of head " c " is labeled as " b ", remaining another lead-out wire pile crown note is " c ", so obtain Fig. 2 b); Analysis chart 2b) obtain another kind of YNd3 wiring transformer winding diagram.Namely the d side phase relation of YNd1 wiring transformer and YNd3 wiring transformer is as table 1.

The d side phase relation contrast table of table 1, YNd3 wiring transformer and YNd1 wiring transformer

2, YNd3 transformer current phase compensating method

YNd1 wiring transformer differential protection, manufactory has achieved transformer differential protection electric current software compensation in protection equipment for transformer.Requirement YNd3 high voltage side of transformer, low-pressure side TA secondary winding all connect as wye connection.

YNd1 wiring transformer d side winding and YNd3 wiring transformer d side winding each phase current relation in comparison sheet 2 (think each phase current homophase of YNd1 and YNd3 wiring transformer Y side winding); be not difficult to find a phase current, c phase current, the b phase current same-phase of a phase current of YNd1 wiring transformer d side winding, b phase current, c phase current and YNd3 wiring transformer d side winding; therefore, the compensation method of YNd3 wiring transformer differential protection current phase is drawn:

(1) each phase current of this YNd3 transformer Y side TA secondary winding each phase current access YNd1 wiring transformer differential protection is constant, and namely YNd3 wiring transformer Y side TA secondary winding A phase current, B phase current, C phase current connect A phase current, B phase current, the C phase current of YNd1 transformer differential protection respectively.

(2) accessing each phase current of YNd1 wiring transformer this YNd3 transformer d side TA secondary winding of differential protection is: by the b phase current loop of a phase current loop of a phase TA secondary winding electric current of YNd3 wiring transformer d side access YNd1 wiring microcomputer transformer differential protection d side, c phase TA secondary winding electric current access YNd1 wiring microcomputer transformer differential protection d side, the c phase current loop of b phase TA secondary winding electric current access YNd1 wiring microcomputer transformer differential protection d side.

(2) by this conversion, YNd3 wiring transformer differential protection just changes YNd1 wiring transformer differential protection into; The electric current software phase compensation of recycling YNd1 wiring microcomputer transformer differential protection, thus the current phase finally achieving YNd3 wiring transformer differential protection compensates.Fig. 3 is shown in concrete wiring.

Claims (1)

1. a YNd3 transformer differential protection current phase compensation method, is characterized in that:

YNd3 high voltage side of transformer, low-pressure side TA secondary winding all connect as wye connection, and this YNd3 transformer Y side TA secondary winding A phase current, B phase current, C phase current access the A phase current of YNd1 transformer differential protection, B phase current, C phase current loop respectively; The concrete grammar of YNd3 transformer d side TA secondary winding each phase current access YNd1 wiring microcomputer transformer differential protection is as follows:

(1) by a phase current loop of YNd3 wiring transformer d side a phase TA secondary winding electric current access YNd1 wiring microcomputer transformer differential protection d side;

(2) by the b phase current loop of YNd3 wiring transformer d side c phase TA secondary winding electric current access YNd1 wiring microcomputer transformer differential protection d side;

(3) by the c phase current loop of YNd3 wiring transformer d side b phase TA secondary winding electric current access YNd1 wiring microcomputer transformer differential protection d side;

(4) utilize the software phase compensation of YNd1 wiring microcomputer transformer differential protection, phase compensation is carried out to YNd3 wiring transformer differential protection.