Impulse Parameters Determination using the Moving Average Method for Digitally Measured Lightning Impulse Voltage Record

Abstract

This paper clarifies an important fact that the time parameters evaluated from the mean curve obtained after applying moving average are identical to the ones deduced from the original lightning impulse voltage. Digital recording device is always associated with random thermal noise caused by semi-conductor components used in the pre-amplifier in the recorder. The fact makes it possible for us to get rid of random noise superposed on the measured impulse wave form by means of moving average method. Also using the finding, even jittery noisy records can be averaged to a smooth curve from which one can easily distil identical time parameters.