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Series transformer winding overvoltage protection method based on voltage vector difference

A series transformer, overvoltage technology, applied in emergency protection circuit devices, electrical components and other directions, can solve problems such as transformer winding damage, and achieve the effect of preventing equipment damage

Active Publication Date: 2017-01-25
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the corresponding overvoltage protection is not configured, the transformer winding may be damaged due to overvoltage
Existing series transformers are not equipped with overvoltage protection

Method used

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  • Series transformer winding overvoltage protection method based on voltage vector difference
  • Series transformer winding overvoltage protection method based on voltage vector difference

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Experimental program
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Effect test

Embodiment Construction

[0013] The solution of the present invention is specifically to first collect electrical quantities, including voltages at both ends of the series transformer windings (PT1 and PT2), such as figure 2 shown.

[0014] According to the collected electrical quantity, calculate the voltage difference between the two ends of the series transformer winding, and judge the action behavior of the overvoltage protection;

[0015] Among them, the calculation of the voltage difference between the two ends of the series transformer winding specifically refers to the vector difference of the voltages on both sides of the primary winding of the series transformer.

[0016] Among them, the judgment of the overvoltage protection action behavior refers to comparing the fundamental effective value of the voltage difference between the two ends of the winding with the overvoltage fixed value. When the calculated effective value of the fundamental wave of any phase voltage difference is greater t...

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PUM

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Abstract

The invention discloses a series transformer winding overvoltage protection method based on voltage vector difference, comprising: mounting voltage transformers at two ends of a primary winding of a series transformer, calculating a voltage vector difference acquired by the two voltage transformers in real time, comparing a voltage difference valid value with an overvoltage fixed value, and enabling protection if the voltage difference valid value is higher than the overvoltage fixed value and meets time delay. The method of the invention can effectively prevent equipment damage due to series transformer winding overvoltage.

Description

technical field [0001] The invention relates to a design method for series transformer protection in the field of power system, in particular to a protection method for series transformer winding overvoltage. Background technique [0002] A series transformer is a power transformer in which both ends of the primary winding are connected in series to the power system. Compared with ordinary power system transformers, series transformers have different application occasions and different primary wiring. [0003] The primary winding of an ordinary transformer is usually grounded at one end, so the voltage collected by the PT (potential transformer) can faithfully reflect the voltage at both ends of the winding (such as figure 1 shown). Since the primary winding of the series transformer is connected in series to the system, it is not directly grounded, so the voltage measured by the PT reflects the voltage of the winding to ground rather than the voltage across the winding. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/04
CPCH02H7/04
Inventor 张晓宇顾乔根郑超文继锋莫品豪
Owner NR ELECTRIC CO LTD