Monitoring method for direct-current magnetic bias of power transformer

A technology of power transformer and DC bias, applied in voltage/current isolation, measurement of electrical variables, measurement of current/voltage, etc., can solve problems such as the inability to determine the DC bias of power transformers, and improve safety and reliability. Run the effect with little impact

Active Publication Date: 2019-12-31
SHENZHEN POWER SUPPLY BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a DC bias monitoring method for power transformers to solve the problem that the existing DC bias judgment method of power transformers cannot determine whether the DC bias of power transformers is caused by stray currents.

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  • Monitoring method for direct-current magnetic bias of power transformer
  • Monitoring method for direct-current magnetic bias of power transformer
  • Monitoring method for direct-current magnetic bias of power transformer

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Embodiment Construction

[0041] In order to make the above-mentioned purpose, features and advantages of the present application more obvious and understandable, the specific implementation manners of the present application will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the application. However, the present application can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific implementation disclosed below.

[0042] It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" an...

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Abstract

The invention provides a monitoring method for direct-current magnetic bias of a power transformer. The monitoring method comprises the following steps: acquiring a neutral point current of a power transformer in real time; dividing the neutral point current into a plurality of continuous time periods according to a same preset interval time, and performing Fourier analysis on the data of the neutral point current in each time period to obtain a direct current signal Im; comparing the direct current signal Im with a first preset current threshold, and determining whether direct current magnetic bias occurs in the power transformer or not; if direct current magnetic bias occurs in the power transformer, judging whether the maximum value of the direct current signal Im in a first time periodafter a first time point is greater than a second preset current threshold or not and whether the minimum value of the direct current signal Im in the first time period is smaller than a third presetcurrent threshold or not; and if the conditions are met, determining that the direct-current magnetic bias of the power transformer is caused by stray current.

Description

technical field [0001] The present application relates to the technical field of power transformers, in particular to a method for monitoring DC bias magnetism of power transformers. Background technique [0002] The DC bias phenomenon exists in the power transformer in the power system. Because urban rail transit mostly uses DC to drive vehicles, the DC power supply of rail transit returns through the steel rails, and the rails are not completely insulated from the ground, causing stray currents to exist in the ground. The stray current of the subway enters the power transformer from the neutral point, causing the neutral point current of the transformer to increase, resulting in the generation of DC magnetic flux in the iron core of the power transformer, resulting in a DC bias phenomenon. [0003] With the continuous advancement of my country's urbanization process and the continuous expansion of urban construction scale, the application of rail transit in major cities i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/165G01R31/00G01R15/20
CPCG01R15/202G01R19/16528G01R19/16571G01R31/00
Inventor 汪鹏陈龙严亮张繁谷若雨严平池方仁肖黎
Owner SHENZHEN POWER SUPPLY BUREAU
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