Electrical Design of a 345-kV Double-Circuit Transmission Line Including the Influence of Contamination

The Detroit Edison Company, in planning their 345-kV system, felt it advisable to undertake a critical examination of the electrical design of 345-kV steel tower circuits. The investigation of performance of double-circuit steel tower line design for 12, 15, 17, and 20 insulation units is reported. Special emphasis is placed on line reliability as influenced by contaminated insulators.