Radio-Influence Testing on 70 Miles of 345-Kv Horizontal Bundle Conductor

Radio-influence (RI) test results on 70 miles of 345-kv transmission line are presented. The design of the 345-kv transmission line using 954-MCM (thousand circular mils) ACSR (aluminum cable, steel reinforced) conductor bundled at 18-inch spacing, the use of standard suspension clamps, triangular space plates, and a horizontal phase spacing of 27 feet resulted in satisfactory RI level without control rings at the conductor hardware assemblies. Attenuation tests show that RI readings at one site are not materially affected by precipitation on the line a few miles away.