An Analysis of Transmission, Line Audible Noise Levels Based Upon Field and Three-Phase Test Line Measurements

Audible noise measurements on a three-phase test line have been made on four conductor configurations energized at 525 kVL_ L. A statistical analysis of the resulting noise levIels is presented. In addition to being energized three phase, the test line was energized single phase and a comparison is made with single-phase laboratory test results. The noise level from a four-bundle configuration at reduced phase spacing simulating 735-kV operation is evaluated.