STUDY ON CHARACTERISTICS AND IDENTIFICATION OF TRANSIENTS ON TRANSMISSION LINES CAUSED BY LIGHTNING STROKE

The travelling wave, which is caused by lightning stroke without fault generated, will decline to zero after many refractions and reflections. So the waveform of the travelling is alternative around the time axis. However, the travelling wave that is caused by faults and lightning stroke with fault generated, in a whole, will change monotonously in short time. Therefore, a line is used to fit the travelling wave, and the conception of “coefficient of waveform coordination” is presented. According to the value of the coefficient, travelling wave caused by faults can be distinguished from travelling wave caused by others. Lots of simulation show that the presented method is reliable and effective. Further more, this method can be used in any relay based on transient component.