Insulators to Withstand Air-Borne Deposits

Representative types of fog insulators are classified according to design principles. The general conclusion is that each type has inherent limitations and that a completely satisfactory solution of the problem is still to be found. The mechanism of leakage surge flashover is examined. Continued research into methods of establishing a voltage gradient by resistance means is recommended. In such research, leakage surge counters promise to be a useful tool. A description is given of surge measuring equipment and of results obtained on the group of outdoor tests.