Method and system for degaussing power transformer

Abstract

The invention provides a method and a system for degaussing a power transformer. According to the method, after direct resistance of the power transformer is tested, a residual magnetic flux of the power transformer is obtained by a saturated magnetic flux and framework wire wrapping coefficients of the power transformer; a counter magnetic flux of the residual magnetic flux is obtained according to the magnitude and the polarity of the residual magnetic flux; the counter magnetic flux is added to the power transformer, and the aim of degaussing the residual magnetic flux is realized by the property that the direction of a transient state magnetic flux in the counter magnetic flux is opposite to that of the residual magnetic flux. According to the method and the system for degaussing the power transformer, the magnitude and the polarity of the residual magnetic flux in the power transformer are firstly estimated, and a counter magnetic flux technological means is added to realize effective degaussing of the residual magnetic flux; the degaussing effect is obvious, and the problems in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of power transformers, and more specifically, to a method and system for degaussing a power transformer. Background technique [0002] The power transformer is one of the important components of the power grid. After the direct resistance test of the power transformer, there will be a certain residual magnetic flux in the iron core. Due to the existence of the residual magnetic flux, a large number of harmonics will be generated in the excitation current, which not only increases the The reactive power consumption of the power transformer may also cause the malfunction of the relay protection, resulting in economic losses. At the same time, the high saturation of the iron core also increases the magnetic flux leakage, causing local overheating of the metal components of the power transformer and decomposition of the transformer oil, which affects the service life of the power transformer. And once the resid...

AI Technical Summary

Problems solved by technology

[0002] The power transformer is one of the important components of the power grid. After the direct resistance test of the power transformer, there will be a certain residual magnetic flux in the iron core. Due to the existence of the residual magnetic flux, a large number of harmonics will be generated in the excitation current, which not only increases the The reactive power consumption of the power transformer may also cause the malfunction of the relay protection, resulting in economic losses

At the same time, the high saturation of the iron core also increases the magnetic flux leakage, causing local overheating of the metal components of the power transformer and decomposition of the transformer oil, which affects the service life of the power transformer

And once the residual magnetic flux is generated, it will not disappear automatically, and it will exist for a long time under normal conditions, which will seriously affect the stable and safe operation of power transformers and power systems.

[0003] The current residual magnetic flux elimination technology is still immature, and the degaussing effect is not obvious, and some may even cause impacts on power transformers

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