Phenomenon of an anomalous discharge on HV external insulation and methods of its control

The mechanism of anomalous flashover on HV insulation at sufficiently low voltages (AC voltage, lightning and switching overvoltages) was earlier investigated and the model of the process developed by author. The anomalous discharges, (AD), in common case can arise with some probabilities on the standard designed insulators from porcelain, glass, silicone. In spite of low probability of realization of this anomalous mechanism in a separate insulator nevertheless this phenomenon is important for practice because of its influence on reliability of work (BIL) for whole power objects such as overhead line and substation. In contrast to previous publications, in present report in detail a number of specifics of an AD appearance are examined. Mentioned makes it possible to select optimum methods of its control. The work critically discusses anomalous flashovers of FRP hot sticks on 500 kV overhead lines, (Manitoba Hydro), mechanism of its suppression for the purpose of the complete elimination appearance of such anomalies on a base developed model.