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Measurement method of magnetic core remanence in closed magnetic circuit

A measurement method and magnetic core technology, applied in the direction of magnetic performance measurement, the size/direction of the magnetic field, etc., can solve the problems of large measurement data, cumbersome measurement process, complicated operation, etc., and achieve universal applicability, simple and clear principle, and high accuracy sexual effect

Active Publication Date: 2016-01-06
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The result of this method does not measure the residual magnetism, but only considers the analysis of the remanence coefficient on the operation of the current transformer, and is not suitable for the residual magnetism detection of large-scale power equipment. The actual measurement data is large, the measurement process is cumbersome, and the operation complex

Method used

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  • Measurement method of magnetic core remanence in closed magnetic circuit
  • Measurement method of magnetic core remanence in closed magnetic circuit
  • Measurement method of magnetic core remanence in closed magnetic circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The closed magnetic circuit magnetic core to be tested is a transformer toroidal magnetic core, which has an outer diameter of D=410mm, an inner diameter of d=250mm, and a core height of h=45mm. It is made of silicon steel sheet material of type 30ZH120. The B-H magnetization curve of the material and μ -H curve graph such as image 3 shown.

[0046] The first step is to establish a simulation model of the closed toroidal core to be tested

[0047] According to the structural dimensions of the closed toroidal core to be tested, draw the closed toroidal core model to be tested in the computer equipped with the electromagnetic field simulation software Magnet program, and according to the material characteristic parameters of the closed toroidal core to be tested in the electromagnetic field simulation software Magnet Set the material properties of the magnetic core in the electromagnetic field simulation software Magnet, thereby establishing a simulation model of the cl...

Embodiment 2

[0066] Except in the second step (2), the measurement coil is loaded with 10 series of DC voltage excitations corresponding to the magnetic flux in the range of 10% to 100% saturation flux, and 10 groups of residual magnetism are set in the third step, and other Operation is with embodiment 1.

Embodiment 3

[0068] The closed rectangular magnetic core to be tested is a transformer rectangular magnetic core, where the length w of the outer ring of the rectangular magnetic core 1 =300mm, the length w of the inner ring of the rectangular magnetic core 2 =240mm, which is the width h of the outer ring of the rectangular magnetic core 1 =200mm, the width h of the inner ring of the rectangular magnetic core 2 =140mm, using silicon steel sheet material of type 30Q140.

[0069] The first step is to establish a simulation model of the closed rectangular magnetic core to be tested

[0070] With embodiment 1.

[0071] In the second step, the current change value in the measurement coil of the closed rectangular magnetic core simulation model to be tested is obtained in the simulation model, and the relationship between the residual magnetism and the current change value of the closed rectangular magnetic core to be tested is further obtained.

[0072] The following operations (1) to (3) a...

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Abstract

The invention discloses a closed magnetic circuit magnetic core residual magnetism measuring method and relates to object magnetism measurement. The method includes the steps of firstly, building a simulation model of a to-be-measured closed magnetic circuit magnetic core; secondly, obtaining the current variation of the measuring coil on the other side of the to-be-measured closed magnetic circuit magnetic core; collecting and analyzing the current of the measuring coil on the other side of the to-be-measured closed magnetic circuit magnetic core so as to obtain the relationship formula of the current variation value of the measuring coil on the other side of the to-be-measured closed magnetic circuit magnetic core and the residual magnetism; fourthly, determining the residual magnetism of the to-be-measured closed magnetic circuit magnetic core. By the method, the problem that the magnitude and direction of the residual magnetism of the closed magnetic circuit magnetic core are difficult to obtain is solved.

Description

technical field [0001] The technical solution of the invention relates to measuring the magnetism of an object, specifically a method for measuring the residual magnetism of a magnetic core in a closed magnetic circuit. Background technique [0002] After the power equipment with a closed magnetic circuit core structure is in operation, there will inevitably be residual magnetism problems, and the hysteresis characteristics of the closed magnetic circuit magnetic core material lead to the generation of residual magnetism. After the equipment with closed magnetic circuit magnetic core structure is tested or operated, before it is put into the power supply and distribution system again, the existence of residual magnetism may generate overcurrent and overvoltage when switching on, causing the relay protection device to operate, causing tripping or even burning Devices and other issues. However, until now, after the test or operation of equipment with a closed magnetic circuit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/12G01R33/02
Inventor 汪友华戈文祺
Owner HEBEI UNIV OF TECH