Statistics of Electromagnetic Noise Due to High-Voltage Power Lines

The impulsive noise caused by a 275-kV transmission line has been measured at 80, 150, and 480 MHz and the results are presented in the form of graphs of the amplitude probability distribution (APD), average level crossing rate, and pulse width (PWD) and pulse-interval distributions (PID's). It is concluded that the noise decreases as the monitoring frequency increases and as the moniitoring antenna is moved away from directly beneath the line. The character of the noise also changes, noise bursts being much less apparent at higher frequencies.