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Abstract
Abstract. In the power drive system of the Electric Vehicles (EVs) and Hybrid Electric Vehicles (HEVs), High Voltage (HV) cables play a major role in evaluating the EMI of the whole system. Transfer impedance (ZT) is the most commonly used performance parameter for the HV cable. To analyse and design HV cables and connectors with better shielding effectiveness (SE), appropriate measurement and simulation methods are required. In this paper, Ground Plate Method (GPM) with improvements has been proposed to measure ZT. Use of low-frequency ferrites to avoid ground-loop effects has also been investigated. Additionally, a combination of analytical model with a circuit model has been implemented to simulate limitations (frequency response) of the test setup. Also parametrical studies using the analytical model have been performed to analyse the shielding behaviour of HV cables.
Highlights
The Transfer impedance (ZT) of a cable shield is considered as a benchmark of shielding performance, which has been used by communication cable industries for many decades
Since the shielded cables are being used in Electric Vehicles (EVs) and Hybrid Electric Vehicles (HEVs), it has become important to measure the shielding performance against disturbances from the inner conductor(s)
Triaxial Method requires for different dimensions of the cable, to rebuild a large partition of the test structure
Summary
The Transfer impedance (ZT) of a cable shield is considered as a benchmark of shielding performance, which has been used by communication cable industries for many decades now. Injection Method (LIM) is easier to apply, but ZT measurement results are sometimes sensitive to different positions of the injection line, especially in case of non-symmetrical cables and connectors. It had the flexibility to measure various types of shielded cables and cable-connector systems with different sizes and lengths using same test-setup, still some points had to be improved e.g. wider measurable frequency range and simple method of making the termination connections at far-end were required. Apart from the measurement of ZT, analytical methods to simulate ZT of shielded cables using simple braid parameters are very useful to predict shielding behaviour and improve the design of the HV cable and connectors systems. 4 gives suggestions to improve ZT of the HV cable and optimize GPM measurement setup, followed by concluding remarks in Sect.
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