Zinc Oxide Arrester Health Status Online Evaluation System

The health status of zinc oxide arrester is closely related to the stable operation of power system. In order to study the on-line health evaluation system of zinc oxide arrester, this paper uses leakage current detection method, harmonic analysis method and FFT to extract the resistive current, resistive fundamental wave and third harmonic components. The simulation analysis of the deterioration, moisture and surface pollution of the arrester shows that the health of the arrester can be evaluated effectively by the resistive fundamental current and the resistive third harmonic current. Considering the influence of temperature and humidity, this paper introduces temperature and humidity conversion to improve the monitoring accuracy. Finally, an online evaluation system for the health status of zinc oxide arrester is designed and made. The rationality and effectiveness of the system are verified by comparing the software and hardware debugging with the simulation results.