Measuring device and method for DC magnetic shielding effectiveness
A technology of measuring device and measuring method, which is applied in the field of measuring, can solve problems such as large errors in measuring results, lack of versatility, and cumbersome measuring process, and achieve the effects of improving proportional accuracy, simple and easy testing methods, and simple structure
Active Publication Date: 2020-01-24
SHANGHAI INST OF MEASUREMENT & TESTING TECH
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Problems solved by technology
However, the existing measurement methods generally have the defects of cumbersome measurement process, large error of measurement results and lack of versatility.
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[0032] As mentioned in the background technology, due to the existence of leakage magnetic field and stray magnetic field, it will interfere with the normal operation of the main iron core and seriously affect the proportional accuracy of the DC current comparator (DCC), so it is necessary to carry out the optimal design of magnetic shielding, and Measure the DC magnetic shielding effectiveness, analyze and block the way for the interference magnetic field to enter the main iron core. For this reason, the inventor tries to adopt the following mode:
[0033] The first method: mathematical formula calculation. The formula for calculating the DC magnetic shielding effectiveness in the axial and radial directions of the magnetic shield is derived, and the values of each parameter are substituted into the formula to obtain the DC magnetic shielding effectiveness. This requires accurate measurement of the magnetic permeability of various materials. However, the magnetic permeabil...
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Abstract
The invention provides a measuring device for direct-current magnetic shielding efficiency. The measuring device comprises a direct-current current source, a current bus, a magnetic shielding body anda magnetic field detecting instrument, wherein the direct-current current source provides direct-current power supply for the measuring device; the current bus is bridged between the positive pole and the negative pole of the output end of the direct-current current source, and a closed loop is jointly formed by the current bus and the direct-current current source; the magnetic shielding body isarranged in a magnetic field defined by the current bus and the direct-current current source; the magnetic field detecting instrument is used for measuring the magnetic field intensity. Meanwhile, the invention provides a corresponding measuring method, and the measuring method includes the following steps that P1, the magnetic shielding body is taken out, the magnetic induction intensity of a magnetic-shielding-free measuring point A is measured through the magnetic field detecting instrument, and data B<0> is recorded; P2, the magnetic shielding body is put into the magnetic field, the magnetic induction intensity of a magnetic-shielding measuring point A is measured through the magnetic field detecting instrument again, and data B<1> is recoded; P3, the direct-current magnetic shielding efficiency S is computed. The measuring device and the measuring method are simple and easy to achieve, and the measuring accuracy is greatly increased.
Description
technical field [0001] The invention relates to the measurement field, in particular to a measuring device and a corresponding measuring method for DC magnetic shielding effectiveness. Background technique [0002] DC large current measurement technology is widely used in industrial production and scientific research. For example, DC high-voltage power transmission, metal electrolysis, high-speed rail locomotives, electric vehicles and other industries all need to accurately measure DC large current to measure line loss, current efficiency or safety monitoring. ; In scientific research such as nuclear power and high-energy physics, it is necessary to measure, control and stabilize DC large currents with high accuracy for scientific experiments. In industrial production and scientific research, the size and accuracy of DC current measurement vary greatly. Industrial production often requires large currents, and the current range can reach hundreds of thousands of amperes. Sci...
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IPC IPC(8): G01R33/02
CPCG01R33/02
Inventor 周力任潘洋朱力
Owner SHANGHAI INST OF MEASUREMENT & TESTING TECH