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YNd7 wiring transformer longitudinal differential protection current phase compensation method

A current phase compensation and differential protection technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problem 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: 2015-02-25
STATE GRID CORP OF CHINA +2
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AI Technical Summary

Problems solved by technology

However, at present, the differential protection current software phase compensation method of various transformer protection manufacturers usually only develops several commonly used transformer wiring groups, such as YNd1 wiring group and its wiring combination, etc., and cannot adapt to other wiring groups and wiring combinations.

Method used

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  • YNd7 wiring transformer longitudinal differential protection current phase compensation method
  • YNd7 wiring transformer longitudinal differential protection current phase compensation method
  • YNd7 wiring transformer longitudinal differential protection current phase compensation method

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Experimental program
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Embodiment Construction

[0017] specific implementation plan

[0018] 1. Phase relationship between YNd7 wiring transformer and YNd1 series wiring transformer

[0019] YNd7 wiring transformer wiring diagram see figure 1 . Because the three-phase voltages of the high-voltage side and low-voltage side of the YNd7 transformer are symmetrical, so only one line voltage is used for comparison, so there is advanced 210 degrees. YNd1 wiring transformer wiring diagram see figure 2 a), same as YNd1 transformer advanced 30 degrees. We put the YNd7 transformer with YNd11 transformer Consider the same phase, compare the low voltage side of YNd1 transformer and YNd7 transformer The relationship between. And the low voltage side of YNd7 transformer is the voltage of the low-voltage a winding on the A-phase iron core column- exist figure 2 In a), we can also find the voltage of the low-voltage a winding on the A-phase core leg - (It is regarded as equivalent to the low-voltage side of the Y...

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Abstract

The invention belongs to a relay protection control technology of a power transmission and distribution network, and particularly relates to an YNd7 wiring transformer longitudinal differential protection current phase compensation method. According to the method, the d-side b-phase TA secondary winding current of an YNd7 wiring transformer is connected to an a-phase current loop on the d side of differential protection of an YNd1 wiring microcomputer transformer; the d-side a-phase TA secondary winding current of the YNd7 wiring transformer is connected to a b-phase current loop on the d side of differential protection of the YNd1 wiring microcomputer transformer; the d-side c-phase TA secondary winding current of the YNd7 wiring transformer is connected to a c-phase current loop on the d side of differential protection of the YNd1 wiring microcomputer transformer; by the adoption of software phase compensation of an YNd1 wiring microcomputer transformer differential protection device, current phase compensation is conducted on YNd7 wiring transformer differential protection. The YNd7 wiring transformer longitudinal differential protection current phase compensation method is simple in principle and convenient to implement and can complete current phase compensation of the YNd7 wiring transformer differential protection.

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 YNd7 connection 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 phas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/045
Inventor 汤大海易新陈燕
Owner STATE GRID CORP OF CHINA
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