Recommendations for high-voltage testing: EEI-NEMA subcommittee report

THIS subcommittee was established to study laboratory differences in results and methods in high-voltage testing and to propose laboratory technique to remedy these differences. Line-insulator, gap, and apparatus-insulator testing have been included in the scope of subcommittee activities. Some two years ago the subcommittee reported on flashover characteristics of rod gaps and insulators.¹ Since then continued work on high-voltage problems has resulted in a markedly improved understanding of the situation and some further recommendations have been agreed upon. Section II of this paper gives general recommendations for impulse testing and Section III outlines the scope of the Committee´s recent activities and presents additional recommendations, particularly as to humidity corrections. All these activities are definitely related to the major problem of insulation co-ordination.