Lightning investigations on 33-kv wood-pole lines

IN RECENT YEARS the importance of providing reliable service over lines in the transmission class of 22 to 44 kv has greatly increased. However, little fundamental data have been obtained on the severity of lightning duty on such lines or upon the detailed lightning performance of various types of line design and lightning protection. Most of such information has been gathered on the higher-voltage steel-tower lines. A comprehensive lightning investigation of this type has been undertaken jointly by the Public Service Company of Northern Illinois and the Westinghouse Electric Corporation on several types of 33-kv wood-pole circuits.