Method for testing direct-current resistance of transformer

A DC resistance test and transformer technology, applied in the field of electrical variable measurement, can solve the problems of long measurement consumption, large transformer coil inductance, low measurement efficiency, etc., reducing measurement time, improving measurement efficiency, and simple and easy operation. Effect

Active Publication Date: 2013-01-09
保定市金源科技有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

In addition, due to the large inductance of the transformer coil, it takes a long time to charge the coil for each individual measurement.
Therefore, a complete detection

Method used

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  • Method for testing direct-current resistance of transformer
  • Method for testing direct-current resistance of transformer
  • Method for testing direct-current resistance of transformer

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[0020] In order to enable those skilled in the art to better understand the technical solutions in the application, the following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Obviously, the described The embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work should fall within the protection scope of this application.

[0021] Such as figure 2 As shown, it is a schematic diagram of the connection of the three windings in the existing transformer. The three windings in the transformer in the figure are connected in a star shape. The three windings are provided with multiple taps, and the output terminal of the first winding Is A, the output of the second winding is B, the...

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Abstract

The invention discloses a method for testing direct-current resistance of a transformer. The method includes the steps: connecting a first series branch consisting of a first current source and a first standard resistor between an output end of a first winding and an output end of a second winding; connecting a second series branch consisting of a second current source and a second standard resistor between an output end of a second winding and an output end of a third winding; respectively measuring the voltage among the output end of the first winding, the output end of the second winding, the output end of the third winding and a neutral point and the voltage of the first standard resistor and the second standard resistor; calculating the current of the first standard resistor and the second standard resistor; and calculating the working resistance of the first winding, the second winding and the third winding. Besides, the current flowing through the second winding is equal to the sum of the current flowing through the first series branch and the current flowing through the second series branch. By the method, the working resistance of the three windings can be simultaneously measured once when the transformer is positioned at the same gear, operation is simple and easy, measuring time is greatly saved, and measuring efficiency is improved.

Description

technical field [0001] The present application relates to the technical field of electric variable measurement, in particular to a method for testing DC resistance of a transformer. Background technique [0002] The secondary winding of a multi-tap transformer is usually provided with multiple adjustable gears. The adjustable gear changes the output voltage level by changing the connection position of the secondary winding. The resistance value corresponding to each gear in the winding is directly related to the voltage of the transformer. The accuracy of the output voltage of the transformer, so the DC resistance detection of the transformer is an important inspection item in the transformer semi-finished product test, finished product factory test, installation, handover test and preventive test of the power department. Through the detection, the manufacturing defects of the transformer coil (such as Improper material selection, missing strands, disconnection, welding, oxi...

Claims

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Application Information

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IPC IPC(8): G01R27/08
Inventor 王永辉田喜乐丁会明
Owner 保定市金源科技有限公司
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