Test method and system for electromagnetic shielding performance of low-voltage power cable

A technology of electromagnetic shielding and testing methods, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems that the shielding coefficient method is difficult to accurately simulate the impedance of the shielding layer to the ground, the matching is difficult, and the test is cumbersome, etc., and it is easy to build Easy to implement, easy to test, and strong in applicability

Active Publication Date: 2018-11-30
SOUTHEAST UNIV
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Problems solved by technology

[0004] In order to solve the technical problems raised by the above-mentioned background technology, the present invention aims to provide a method and system for testing the electromagnetic shielding performance of low-voltage power cables. Accurately simulate the impedance of the shielding layer to ground, the test results are unreliable and susceptible to stray electromagnetic field interference and other issues

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  • Test method and system for electromagnetic shielding performance of low-voltage power cable
  • Test method and system for electromagnetic shielding performance of low-voltage power cable
  • Test method and system for electromagnetic shielding performance of low-voltage power cable

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Embodiment Construction

[0036] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0037] See attached figure 1 , The steps of the method for testing the electromagnetic shielding performance of low-voltage power cables designed by the present invention are as follows. Step S101, configuring a grounding impedance loop of the shielding layer of the cable under test.

[0038] Considering the type and laying conditions of the tested cable, the ground inductance of the unit length of the tested cable exposed to the air refers to the following formula:

[0039]

[0040] In formula (1), μ 0 is the vacuum permeability, γ g is the propagation constant of the earth, and R is the average radius of the tested cable.

[0041] Refer to the following formula for the inductance of the unit length of the buried cable to the ground:

[0042]

[0043] In formula (2), K 1 Modified Bessel functions of the first order and second k...

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Abstract

The invention discloses a test method and system for the electromagnetic shielding performance of a low-voltage power cable. An alternating current variable-frequency power source is used for providing excitation for a main loop tested cable core, the grounding state of a main loop tested cable shielding layer and an auxiliary loop tested cable shielding layer is switched, the voltage to earth ofan auxiliary loop tested cable core is obtained by a signal acquisition device, shielding factors of the tested cables are determined, so that the shielding performance of the power cable is analyzedand evaluated quantitatively and qualitatively, namely the smaller the shielding factors are, the better the shielding performance of the cable is. The test method and system do not need to consider the problems of the tested cable matching, stray electromagnetic field interference and the like, and have the advantages of simple test, high applicability, easy construction and implementation and the like.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic compatibility testing, and in particular relates to a method and system for testing electromagnetic shielding performance of low-voltage power cables. Background technique [0002] Low-voltage power cables are an important part of the power system. They are mainly responsible for the efficient distribution and transmission of electric energy, ensuring the most basic power demand of users at all levels or various loads. However, the widespread application of a large number of nonlinear and unbalanced loads and high-power power electronic equipment has caused more and more serious electromagnetic compatibility problems caused by cable coupling within and between systems. In order to suppress this type of electromagnetic interference, it is necessary to quantitatively evaluate the electromagnetic shielding performance of low-voltage power cables in order to improve and optimize the structure ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
CPCG01R31/001
Inventor 胡鹏周忠元周香李鹏李亚李金朋
Owner SOUTHEAST UNIV
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