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Phase compensation method for y-side phase-shift current of YNy4 transformer differential protection

A differential protection and phase compensation technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problem of not designing transformer differential protection current software, etc., and achieve the effect of preventing malfunction and being easy to implement

Inactive Publication Date: 2017-03-22
STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, transformer protection manufacturers only design differential protection current phase compensation methods for transformer wiring groups YNd11, YNd1, and YNyn12 and their wiring combinations, and have not designed transformer differential protection for other wiring groups and wiring combinations. Protection Current Software Phase Compensation Method

Method used

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  • Phase compensation method for y-side phase-shift current of YNy4 transformer differential protection
  • Phase compensation method for y-side phase-shift current of YNy4 transformer differential protection
  • Phase compensation method for y-side phase-shift current of YNy4 transformer differential protection

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] Such as figure 1 Shown is the YNy4 transformer wiring diagram that the present invention relates to.

[0029] Since the microcomputer transformer protection is generally designed with integrated main protection and backup protection and dual configuration, the transformer differential protection requires YNy4 transformer high voltage side and low voltage side TA secondary windings to be connected in star connection. The current software phase compensation scheme of YNy4 connection transformer differential protection device is:

[0030] Step 1: Connect the secondary windings of the current transformer TA on the high voltage side and low voltage side of the YNy4 transformer to a star connection;

[0031] Step 2: Based on the Y side, for the Y side, because the zero-sequence current needs to be eliminated The impact on differential prot...

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Abstract

The invention discloses a phase compensation method for y-side phase-shift current of YNy4 transformer differential protection. Misoperation of transformer differential protection caused by the influence of zero-sequence current is prevented by eliminating the zero-sequence current in phase current at a Y side and a y side of a YNy4 transformer. For YNy4 transformer differential protection, phase compensation is a y-side phase shift method on the basis of the Y side; current phase compensation is carried out on the Y side by adopting a calculation method of eliminating the zero-sequence current through sequence-phase current on the basis of A-phase current; and current phase compensation is carried out on the y side of the YNy4 transformer by adopting the calculation method of eliminating the zero-sequence current through the sequence-phase current and a principle of corresponding current in-phase of the Y side. The phase compensation method is suitable for a technical scheme of current software phase compensation of longitudinal differential protection devices of transformers with various voltage classes for YNy4 connection of power transmission and distribution network substations, and is simple, clear, and easy to implement.

Description

technical field [0001] The invention relates to a YNy4 transformer longitudinal differential protection method for eliminating zero-sequence current y-side phase-shifting current phase compensation method, belonging to the technical field of relay protection control equipment for electric power transmission and distribution networks. Background technique [0002] Since the phases of the currents on each side of the transformer may be inconsistent, the transformer longitudinal differential protection (hereinafter referred to as the transformer differential protection) needs to perform current phase compensation. There are two methods for current phase compensation of transformer differential protection: 1. Traditional hardware phase shifting: for example, YNd11 transformer Y side current transformer TA secondary winding adopts delta d-11 connection, d side TA secondary winding adopts star Y -12 wiring; 2. Software phase shift: that is, use software programs and calculation fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/045
CPCH02H7/045
Inventor 汤大海李静易新陈永明曹斌崔玉孙东杰马海薇陈燕施伟成
Owner STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO
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