A pattern of string insulators behavior during up-and-down test method

The application of the up-and-down test method for determining the 50% disruptive discharge voltage for insulation tested under impulse voltage conditions is recommended by standards due to its advantages. Voltage measurements can be conducted using a peak voltmeter or a digital recorder. During this type of test, recording the exact time of chopping (the time when disruptive discharges occur) is not necessary. However, this study aims to identify patterns in the behavior of different rated voltage insulator strings when tested with lightning impulse voltage. It also seeks to determine the "disruptive effect," as defined in the equal areas theory, which allows for the evaluation of disruptive voltage for impulse wave shapes that differ from standardized ones, based on the insulator's behavior during the up-and-down test under standardized lightning impulse voltage.