Design of Measurement System and Characteristics Research on the Pulse Current of Composite Insulator

摘要

The composite insulators have been widely used on the power transmission lines. The faulty caused by manufacture techniques, quality defect or organic material degradation comes into being more and more. Measuring the composite insulator1 corona pulse current flowing through the grounded wire is an excellent way to monitor the faulty insulator strings on ground. In this paper, the measurement system for detecting pulse current of composite insulator are set up. The wideband current transducer, extraction circuit of pulse current and the circuit of reference signal are designed and manufactured. Based on the experimental system set up in the laboratory, the characteristics of corona pulse are studied. The relationship between applied voltage and pulse current characteristics, the frequency and phase angle range of corona pulse are studied profoundly. Such work provides direction for on-line monitoring composite insulators by pulse current method.%W artykule analizowano metody badania defektów izolatorów kompozytowych. Mierzono impulsowy prąd wyładowania przepływający przez uziemiony przewód. Przedstawiono układ pomiarowy tego prądu oraz przedstawiono wyniki eksperymentów. Analizowano związek między przyłożonym napięciem a prądem wyładowania, w tym właściwości częstotliwościowe I fazowe tego prądu.