MEASUREMENT OF TRANSFER IMPEDANCE AND SCREENING ATTENUATION EFFECTS ON CABLES USING TRI-AXIAL METHOD

N. Akcam M.H. Karatas
Electrical and Electronics Engineering Department, Gazi University, Ankara, Turkey,
ynursel@gazi.edu.tr, You are not allowed to view links. Register or Login

Abstract

Cables are an essential part of any electrical and electronics systems. Transfer impedance of cables characterizes basic parameters of electromagnetic compatibility like immunity and radiation on cables. In this study, experiment of transfer impedance measurement has been performed to express screening efficiency using tri-axial method on cables according to EN ISO 50289-1-6 standard. On the other hand transfer impedance has been analyzed mathematically and obtained results have been simulated via Simulink and Matlab. Acquired simulation results and experiment
results have been compared comprehensively. Keywords: Electromagnetic Compatibility, EMC,
Transfer Impedance, Screening Attenuation, Tri-axial method.

I. INTRODUCTION

Electromagnetic Interference (EMI) event emerge with interaction of devices each other or  lectromagnetic noise at environment. Under electromagnetic interference (EMI), devices on daily life exhibits different behavior from expected characteristics. Also EMI decreases performance of devices and systems. Transfer impedance is the rate of voltage to current which induced at the cable screen and flow inside of cables respectively. Transfer impedance characterizes basic parameters of electromagnetic compatibility as radiation and immunity. For the first time in 1934 scientist Schelkunoff defined transfer impedance at the Bell Laboratory. In this paper, the testing system, which is composed of the tri-axial device, is design to measure the transfer impedance of the cable. Using this testing system, the transfer impedance can be measured by a network analyzer. Measurement methods of screening efficiency have been mentioned and for that purpose measurement experiment of transfer impedance which is the most used parameters defining electromagnetic compatibility has been performed. Transfer impedance has been calculated mathematically and results have been simulated using Matlab and Simulink. Besides simulation results and experiment results have been compared comprehensively.

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