Design and Application of High Potential Acquisition System for Corona Current Measurement

Abstract

Radio interference is an important issue that must be considered in designing HV transmission lines. It is caused by corona current which is due to the complex movement of charged particles around the conductors. Corona current has the characteristics of wide spectrum and strenuous diversification, so it is difficult to measure. In this paper, a corona current measurement system is developed for the investigation of HV test line. The measurement principle and system configuration is described. Problems such as high-voltage insulation, high-frequency signal sampling, interference suppression, signal record and transmission etc. are considered. The system has high measuring accuracy and the characteristic of small size, light weight and easy operating. The signal would not be interrupted and transferring data and the safety of person is ensured. The feasibility of the developed measurement system is validated by the experiments carried out in laboratory.