Analysis of shielding effectiveness of HV cable and connector systems used for electric vehicles

摘要

In order to understand and design better shielding effectiveness (SE) of HV cables and connectors for electric vehicles (EV), appropriate measurement methods are required. The Transfer Impedance ZT is usually measured using Triaxial or Line Injection method. Based on a simplification of Triaxial method, a Ground Plate measurement method has been proposed to evaluate SE of cables and the cable-connector system. Results of proposed method have been compared to Triaxial method for cable only and Line Injection methods for the cable-connector system. Different approaches to analytically model the transfer impedance ZT have been discussed. Dependency of weave angle and braid wire thickness on the shield performance has been simulated in order to better understand cable shield design. The document gives an overview of mathematical modeling techniques and existing measurement methods for ZT. It proposes a simplified approach for evaluating ZT for the complete HV cable connector system used in EV.