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YNd5 transformer longitudinal differential protection Y side current phase compensation method

A technology of longitudinal differential protection and phase compensation, which is applied in the direction of emergency protection circuit devices and electrical components, can solve the problems of not designing transformer differential protection current software, etc., and achieve simple, clear and easy-to-implement effects

Inactive Publication Date: 2015-08-19
STATE GRID CORP OF CHINA +2
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  • Description
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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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  • YNd5 transformer longitudinal differential protection Y side current phase compensation method
  • YNd5 transformer longitudinal differential protection Y side current phase compensation method
  • YNd5 transformer longitudinal differential protection Y side current phase compensation method

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] Such as figure 1 Shown is the YNd5 transformer wiring diagram of the inventive method.

[0028] Since microcomputer transformer protection is generally designed with integrated main protection and backup protection and dual configuration, the transformer differential protection requires YNd5 series transformer high-voltage side and low-voltage side TA secondary windings to be connected in star connection. The current software phase compensation scheme of YNd5 connection transformer differential protection device is:

[0029] (1) Use the Y side of the YNd5 transformer for current phase compensation.

[0030] (2) For the Y side, the current involved in the calculation of differential protection differential current is phase converted according to the following formula:

[0031] I · ...

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Abstract

The invention discloses a YNd5 transformer longitudinal differential protection Y side current phase compensation method. The method comprises the followings steps that: the high-voltage side and low-voltage side TA secondary windings of a YNd5 transformer are in star-type connection; and current phase compensation is carried out at the Y side of the YNd5 transformer. The YNd5 transformer longitudinal differential protection Y side current phase compensation method of the invention can completely accord with transformer longitudinal differential protection basic principles. Compared with a method adopted by an existing transformer differential protection device, the method of the invention has the following advantages that: the method is suitable for current software phase compensation schemes of YNd5-wired transformer longitudinal differential protection devices of various kinds of voltage levels in transmission and distribution network power substations; and the current software phase compensation schemes of the YNd5-wired transformer differential protection devices have simplicity, clearness and easiness in implementation.

Description

technical field [0001] The invention relates to a YNd5 transformer longitudinal differential protection current phase compensation method, which belongs to the technical field of relay protection for 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 of current phase compensation for transformer differential protection: 1. Traditional hardware phase shifting: For example, the secondary winding of Y-side current transformer (hereinafter referred to as TA) of YNd11 transformer adopts delta d-11 connection, and the secondary winding of d-side TA Use star Y-12 wiring; 2. Software phase shift: that is, use software programs and calculation formulas to perform current phase shift to com...

Claims

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Application Information

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IPC IPC(8): H02H7/045
Inventor 刘丛洲唐大海施海亮杨晟吕湛
Owner STATE GRID CORP OF CHINA
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