Radio-influence testing on 70 miles of 345-kv horizontal bundle conductor

A satisfactory radio-influence level (RIL) can be achieved in a 345-kv transmission line using 945-MCM ACSR conductor bundled at 18-inch spacing, standard clamps, triangular space plates, and a horizontal phase spacing of 27 feet. Attenuation tests show that RI readings at one site are not materially affected by precipitation on the line a few miles away The Ohio Edison Company conducted laboratory tests (previous to the construction of 70 miles of the 345-kv line) to determine the corona and RI levels of the line hardware to be used on its 345-kv transmission lines and has conducted field tests on the completed transmission line to evaluate the selection of hardware. On January 31, 1961, the Sammis-Star North 345-kv transmission line was energized for RI testing; see Figs. 1 and 2. The tests ran for approximately 8 weeks.