The study of the corona current characteristics of transmission line insulators

This paper introduced the experimental results of the corona current characteristic of insulator strings at high alternating voltages. The experiments show that the corona current pulses have statistic characteristic and are distinct at different voltages and different environmental condition, such as humidity and contamination. After the establishment of several fuzzy membership functions of humidity and contamination by a large number of experiments, the authors proved that the fault insulators could be distinguished from the transmission line insulator strings by the combination of statistic N-/spl Psi/ graph method and fuzzy logical reasoning, and the correctness of this method has been verified in the laboratory by the 110 kV simulation transmission line. The most important advantages of this method are safe and convenient.