Portable Measurement System for Detecting the Condition of Non-Ceramic Insulator Based on Pulse Current Method

摘要

Presently, more and more non-ceramic insulators are being used on the power transmission lines. With the in-service year's increase, organic material degradation or aging comes into being more and more. In order to keep the running safety of power system, it is important to detect the aging condition of non-ceramic insulators. In this paper, a portable measurement system for detecting pulse current of non-ceramic insulator is set up. The wideband current transducer, extraction circuit of pulse current and the circuit of reference signal are designed and realized. Based on the experimental system set up in the laboratory, the characteristics of corona pulse current are studied. Moreover, the portable measurement system based on pulse current method is also used to diagnose the condition of non-ceramic insulators in the field, the results show that the quantity of corona pulse, the phase distribution and the pulse current amplitude of long time running insulator have obvious difference from that of short time running insulators, which verifies that pulse current method is an excellent way to detect the faulty insulators on ground. Such work provides direction for detecting the aging condition of non-ceramic insulators based on pulse current method.