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YNd5 transformer longitudinal differential protection current phase compensation method

A technology of current phase compensation and differential protection, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of inability to adapt to wiring groups and wiring combinations, and achieve the effect of small changes in the secondary circuit and easy implementation.

Inactive Publication Date: 2014-11-26
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

However, at present, the current software phase compensation method of differential protection of various transformer protection manufacturers usually only develops several commonly used transformer wiring groups, such as YNd11 wiring group and its wiring combination, etc., and cannot adapt to other wiring groups and wiring combinations.

Method used

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  • YNd5 transformer longitudinal differential protection current phase compensation method
  • YNd5 transformer longitudinal differential protection current phase compensation method
  • YNd5 transformer longitudinal differential protection current phase compensation method

Examples

Experimental program
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Embodiment Construction

[0017] 1. Phase relationship between YNd11 wiring transformer and YNd5 series wiring transformer

[0018] YNd5 wiring transformer wiring diagram see figure 1 . Because the three-phase voltages on the high-voltage side and low-voltage side of the YNd5 transformer are symmetrical, it is only necessary to take out one line voltage for comparison, so there is advanced 150 degrees. YNd11 wiring transformer wiring diagram see figure 2 (a), same as YNd11 transformer lag 30 degrees. We put the YNd11 transformer with YNd5 transformer Consider the same phase, compare the low voltage side of YNd11 transformer and YNd5 transformer The relationship between. And the low voltage side of YNd5 transformer exist figure 1 In is the voltage of the low-voltage b winding on the B-phase iron core column exist figure 2 In (a), we can also find the voltage of the low voltage b winding on the B phase iron core column (It is regarded as equivalent to the low-voltage side of th...

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Abstract

The invention belongs to the relay protection control technology of electric power transmission and distribution networks, and relates to a YNd5 transformer longitudinal differential protection current phase compensation method. The method comprises the steps that YNd5 wiring transformer d-side b-phase TA secondary winding current is connected into a YNd11 wiring microcomputer transformer differential protection d-side a-phase current loop; YNd5 wiring transformer d-side a-phase TA secondary winding current is connected into a YNd11 wiring microcomputer transformer differential protection d-side b-phase current loop; YNd5 wiring transformer d-side c-phase TA secondary winding current is connected into a YNd11 wiring microcomputer transformer differential protection d-side c-phase current loop; software phase compensation of a YNd11 wiring microcomputer transformer differential protection device is utilized for carrying out phase compensation on YNd5 wiring transformer differential protection. The YNd5 transformer longitudinal differential protection current phase compensation method can complete current phase compensation for YNd5 wiring transformer differential protection, and is simple in principle and convenient to implement.

Description

technical field [0001] The invention belongs to the relay protection control technology of electric power transmission and distribution network, and relates to a method for current phase compensation of YNd5 transformer longitudinal differential protection. 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: use software program and calculation formula to carry out current phase shift to ...

Claims

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Application Information

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IPC IPC(8): H02H7/045
Inventor 汤大海易新陈燕
Owner STATE GRID CORP OF CHINA
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