Shielding effectiveness measuring method of electric vehicle high-voltage cable

Abstract

The invention, which belongs to the field of cable detection, relates to a shielding effectiveness measuring method of an electric vehicle high-voltage cable. The invention provides a method for measuring the shielding effectiveness of a high-voltage cable of an electric vehicle based on a network analyzer and a current probe, so that the length requirement on the measured shielding cable by the traditional long-line measurement method is eliminated. Furthermore, the invention provides a matching calculation formula of the shielding effectiveness of the shielding cable based on an actually measured scattering coefficient. Under the condition that impedance matching processing is not carried out on the measured cable and the terminating load, the shielding effectiveness of the cable is accurately measured, so that a problem that the impedance matching condition of shielding effectiveness measurement of the existing electric vehicle high-voltage shielding cable is difficult to meet is solved and the shielding effectiveness measurement difficulty of the shielding cable is reduced.

Description

technical field [0001] The invention belongs to the field of cable detection and relates to a method for measuring the shielding effectiveness of high-voltage cables of electric vehicles. Background technique [0002] The automotive wiring harness is a device that transmits or exchanges the power signal or data signal of the electrical system to realize the function of the electrical system. With the improvement of people's requirements for the comfort and safety of automobiles, the types of electronic products on automobiles are also increasing, and the distribution of automobile wiring harnesses is becoming increasingly complex. [0003] A large number of theories and experiments have confirmed that, on the one hand, 90% of the systems cannot pass the radiation emission test or cause interference to adjacent equipment, all due to the electromagnetic radiation of wires and cables; The coupling will affect the normal operation of the equipment, resulting in malfunction and ...

AI Technical Summary

Problems solved by technology

The existing research and specifications on the measurement of shielding effectiveness are all oriented to radio frequency coaxial cables. The characteristics of this cable are that the characteristic impedance has been well regulated and very stable, and it is easy to perform impedance matching in the test. Therefore, the existing measurement Both the method and the specification are carried out under the condition of impedance matching, which greatly reduces the feasibility of the existing measurement method in the shielding effectiveness measurement of high-voltage shielded cables for electric vehicles

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