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Longitudinal differential protection zero suppression y-side compensation method for transformer

A technology of longitudinal differential protection and compensation method, 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 convenient implementation and simple principle

Inactive Publication Date: 2017-02-08
STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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  • Longitudinal differential protection zero suppression y-side compensation method for transformer
  • Longitudinal differential protection zero suppression y-side compensation method for transformer
  • Longitudinal differential protection zero suppression y-side compensation method for transformer

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Embodiment Construction

[0025] Because the microcomputer transformer protection is generally designed as the main protection and the backup protection, the transformer differential protection requires the YNy6 transformer high-voltage side and low-voltage side TA secondary windings to be connected in a star connection. figure 1 It is the wiring diagram of the YNy6 transformer of the present invention. The current software phase compensation scheme of YNy6 wiring transformer differential protection device is:

[0026] A zero-elimination y-side compensation method for longitudinal differential protection of a transformer, comprising the following steps:

[0027] Step 1: Connect the YNy6 transformer high-voltage side and low-voltage side TA secondary windings in star connection;

[0028] Step 2: For the Y side, perform phase conversion according to the following formula, that is, the currents of each phase involved in the differential protection differential current calculation are:

[0029] ...

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Abstract

The invention discloses a longitudinal differential protection zero suppression y-side compensation method for a transformer. The method is applicable to main transformers of various voltage levels of substations of various voltage levels of a power transmission and distribution network to complete current phase compensation of longitudinal differential protection phase current difference eliminating zero sequence current y-side phase shift for a YNy6 transformer. The method includes the steps of using Y-connection means for connecting TA secondary windings at the high-voltage side and low-voltage side of the YNy6 transformer, conducting phase shifting for Y side according to the formula described in the description, and conducting phase shifting for y side according to the formula described in the description.

Description

technical field [0001] The invention relates to a compensation method for zero-elimination y-side of transformer longitudinal differential protection, in particular to a current phase compensation method for eliminating zero-sequence current y-side phase shift of YNy6 transformer longitudinal differential protection phase current difference, which belongs to power transmission and distribution The technical field of relay protection control of electrical network. Background technique [0002] Since the currents on each side of the transformer may be inconsistent in phase, the longitudinal differential protection of the transformer (hereinafter referred to as the transformer differential protection) needs to perform current phase compensation. There are two methods of current phase compensation for transformer differential protection: 1. Traditional hardware phase shifting: such as YNd11 transformer Y-side current transformer (hereinafter referred to as TA) secondary winding ...

Claims

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Application Information

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IPC IPC(8): H02H7/045
CPCH02H7/045
Inventor 李静汤大海易新陈永明曹斌曹海欧陈燕施伟成丁国华
Owner STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO
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