This paper presents the results of laboratory research aimed at studying the behavior of suspended high-voltage insulators of overhead power lines under their uniform and non-uniform contamination. By continuously recording the values of the leakage currents as well as the signals coming from two types of remote sensors, characteristics are revealed which can be used as diagnostic signs. Characteristic of the discharge activity on the surface of lightly contaminated insulators under fog moistening is the sudden appearance and short duration of intense discharges.
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