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Method for measuring coefficient of residual magnetism based on alternating current method

A test method and residual magnetism technology, applied in the direction of magnetic performance measurement, measuring device, measuring electric variable, etc., can solve problems such as inability to meet accurate measurement requirements, achieve the effects of reducing accidental errors, improving test accuracy, and improving accuracy

Inactive Publication Date: 2009-06-03
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

Moreover, whether it is the AC method or the DC method, it is obviously impossible to meet the accurate measurement requirements by observing the remanence point through the oscilloscope hysteresis loop and then calculating the remanence coefficient.

Method used

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  • Method for measuring coefficient of residual magnetism based on alternating current method
  • Method for measuring coefficient of residual magnetism based on alternating current method
  • Method for measuring coefficient of residual magnetism based on alternating current method

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Embodiment Construction

[0016] An embodiment of the present invention is described in detail below: this embodiment is implemented under the premise of the technical solution of the present invention, has provided detailed implementation and specific operation process, but protection scope of the present invention is not limited to the following Example.

[0017] Introduced in the national standard, the measurement of the remanence coefficient Kr is achieved by integrating the excitation voltage

[0018] φ ( t ) = ∫ 0 t ( u ( τ ) - Rct · i ( τ ) ) dτ Among them, Rct is the internal resistance of the winding

[0019] Then, according to the integrated voltag...

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Abstract

A method for testing residual magnetism based on interchange means includes forming test circuit by connecting oscilloscope, switch, continuous self-coupling transformer, second winding current mutual inductor to be tested, two test probes and integration module; regulating said transformer to record voltage and current waveform on oscilloscope using cursor to calculate full wave average value to confirm residual magnetism; reversing power supply; repeating above said recording and calculating steps to derive out average value according to calculated out residual magnetism value.

Description

technical field [0001] The invention relates to a method of electric power testing technology, in particular to a method for testing remanence coefficient based on an alternating current method. Background technique [0002] According to the national standard GB16847-1997 "Technical Requirements for Transient Characteristics of Current Transformers for Protection", there are many performance indicators for measuring the secondary winding of transformers. Among them, the more important parameters are the relationship between winding current and magnetic flux, winding voltage and current, remanence coefficient, winding internal resistance, linear inductance and other parameters. Among these parameters, the measurement of the remanence coefficient is the most complicated, and it is difficult to achieve accurate measurement. It is mentioned in the national standard GB16847-1997 that the measurement of the remanence coefficient is tested by different methods such as the AC metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/02G01R33/12
Inventor 杨煜普曹海朋
Owner SHANGHAI JIAOTONG UNIV
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