A New Approach to On-line Insulation Monitoring of Electric Power Cables Based on Capacitive-current Measurement and Its Criteria

For the sake of identifying the fault of electric power cables easily and practically, this paper presents a new method to measure capacitive current of single-phase/three-phase power cable with two-terminal earthed or multi-points earthed, on the basis of comprehensive analysis of common used on-line insulation monitoring approaches of power cables. Corresponding criteria of insulation condition are given and prototype of measurement device is also designed and realized. Furthermore, in order to verify the effectiveness of the method and criteria, simulation model is detailed in this paper.