Lightning Investigations on a Distribution System

Analyses of field measurements of lightning disturbances and of operating experience on a metropolitan electric power distribution system have yielded valuable information on protective methods. Performance records of transformers, fuses, lightning arresters, meters, and customers equipment with the interconnection method of protection (arrester ground and secondary neutral interconnected) are analyzed. Experience with protective methods for underground cables and for stud type of distribution transformers is cited, and an a-c method of testing arresters is described.