Line insulator loss under normal conditions

MOST OF THE INFORMATION in the literature on line insulator losses is concerned with conditions leading to flashover. Much less information is available on the loss characteristics of insulators under normal conditions, and that available is somewhat contradictory. A summary of published information is presented in Figure 1. Information on insulator loss under normal conditions is of considerable interest to corona loss investigators because it is desirable to be able to differentiate between corona and insulator loss. Utility engineers frequently are concerned about normal insulator loss when attempting to evaluate system losses.