D-side current phase compensation method for YNd5 transformer longitudinal differential protection

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 problem of not designing transformer differential protection current software, etc., and achieve the effect that the compensation method is simple, clear and easy to implement

Inactive Publication Date: 2015-11-04
STATE GRID CORP OF CHINA +2
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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 sof

Method used

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  • D-side current phase compensation method for YNd5 transformer longitudinal differential protection
  • D-side current phase compensation method for YNd5 transformer longitudinal differential protection
  • D-side current phase compensation method for YNd5 transformer longitudinal differential protection

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Embodiment Construction

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

[0027] Such as figure 1 Shown is the YNd5 transformer wiring diagram of the present invention. Because the microprocessor-based transformer protection is generally integrated design and dual configuration for the main protection and backup protection, the transformer differential protection requires the 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:

[0028] (1) Use YNd5 transformer d side for current phase compensation.

[0029] (2) For the Y side, because the zero sequence current needs to be eliminated The impact on the differential protection, so the current involved in the differential current calculation of the differential protection is:

[0030] I · dA = ...

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Abstract

The invention discloses a d-side current phase compensation method for YNd5 transformer longitudinal differential protection. The method is characterized by connecting the high-voltage side TA secondary winding and the low-voltage side TA secondary winding of an YNd5 transformer both in a star connection manner and performing current phase compensation on the d side of the YNd5 transformer. The method has beneficial effects of being a current phase software compensation technology scheme suitable for transformer longitudinal differential protection devices with various voltage classes for YNd5 wiring in a power transmission and distribution network power station, being simple and clear, and being easy to implement.

Description

Technical field [0001] The invention belongs to the relay protection control technology of a power transmission and distribution network, and relates to a YNd5 transformer longitudinal differential protection d-side current phase compensation method. Background technique [0002] Since the current on each side of the transformer may be inconsistent in phase, the transformer longitudinal differential protection (hereinafter referred to as the transformer differential protection) needs to perform current phase compensation. There are two methods for transformer differential protection current phase compensation: 1. Traditional hardware phase shifting: for example, YNd11 transformer Y-side current transformer (hereinafter referred to as TA) secondary winding adopts triangular d-11 wiring and d-side TA secondary winding Use star Y-12 wiring; 2. Software phase shift: that is, use software programs and calculation formulas to perform current phase shift to complete phase compensation. ...

Claims

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Application Information

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IPC IPC(8): H02H7/045
Inventor 刘丛洲汤大海王吉王宇成杨磊
Owner STATE GRID CORP OF CHINA
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