Non-standard square coil for magnetic field immunity test and calibrating method and calibrating system of non-standard square coil

Abstract

The invention aims to provide a non-standard square coil for a magnetic field immunity test which can meet the calibrating requirement and the operating requirement on realizing an immersing method on a high-voltage electrical apparatus, and also provide a calibrating method and a calibrating system of the non-standard square coil. The calibrating system comprises a magnetic field generating loop and a current monitoring loop and / or a magnetic field detecting loop. The calibrating method comprises a step of calibrating the coil factor of the non-standard square coil, a step of calibrating the magnetic field uniformity area of the non-standard square coil and a step of calibrating the maximum feed-in current of the non-standard square coil, wherein the non-standard square coil adopts three turns of copper core cables with the side length being 3 meters which are calibrated to be qualified through the calibrating method. Through the arrangement and combination of different loops, the calibrating system is obtained, calibration and evaluation for key parameters of the non-standard square coil are realized through the calibrating method, particularly, the coil factor and the magnetic field uniformity area of the non-standard square coil are objectively reflected, and the blank in the industry is filled up.

Description

technical field [0001] The invention relates to the technical field of electromagnetic compatibility tests, in particular to a non-standard square coil for a magnetic field immunity test, a calibration method and a calibration system when testing high-voltage electrical appliances. Background technique [0002] The magnetic field immunity test is one of the main contents of the electromagnetic compatibility test project of high-voltage electrical appliances (especially intelligent high-voltage equipment), and the electromagnetic compatibility test has been included in the scope of national compulsory certification. Magnetic field generators (including power frequency magnetic field generators, pulsed magnetic field generators and damped oscillating magnetic field generators) are the main standard devices for magnetic field immunity tests. The square coil is called the standard coil. The effective test area in the standard coil is length × width × height ≤ 0.6 m × 0.6 m × 0....

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Problems solved by technology

However, in the prior art, there is no calibration method for non-standard square coils, especially for the calibration method and calibration system for the two important parameters of the coil factor and the uniform field of the magnetic field except for the maximum feed current, and the calibration of non-coils cannot be guaranteed. Accuracy also greatly reduces the accuracy of follow-up tests, and even cannot be carried out. Therefore, non-standard square coils are not used in the prior art to conduct magnetic field immunity tests on high-voltage electrical appliances according to the "immersion method".

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