500-Kv-Line Design

The results of full-scale transmission-tower switching-surge, impulse, and 60-cycle tests, wet and dry, indicate pronounced departure from previously published data where the effect of the proximity of the tower was not included. The data include single-insulator strings, V-strings, and lhorizontal and vertical tower gaps including guy-wire gaps. These data are an extension of previous studies on Project EHV insulation structures1 and were undertaken to provide design criteria for a 100-mile link of 500-kv line running at an average elevation of 5,000 feet between Klamath Falls, Oreg., anid Round Mountain, Calif.