The Comparison Characteristics of Investigation Breakdown Voltage of Long Flash over Arrestor (LFA) with Different Gaps Space by Using Positive and Negative Impulse Voltage

Abstract

This paper presents the investigation and compares the ring components characteristics of long flashover arrestor (LFA) multi-gap and single gap. There are two cases in this work: (i) the gap ring for the multi-gap with various spacing of 0.5, 0.75, 1.0, 1.25, 1.5, 1.75 and 2.0 cm with diameter of 2.20 cm, and (ii) the gap ring for the single gap with various gap spaces to maximum length of break down. The standard positive and negative impulse voltage was applied from 9 – 150 kV. The results show that LFA with the same breakdown voltage and different gap spaces had the different flashover lengths. The flash length of LFA multi-gap with gap space of 0.75, 1.0, 1.25, 1.5, 1.75 and 2.0 cm under positive and negative impulse is almost the same value and lower than the LFA single gap. The flash length of LFA gap of 0.5 cm under the positive impulse voltage is longer than under the condition of the negative impulse voltage average about 1.5 cm. The flash length of single gap is equally with the voltage level 9-72 kV. At the positive voltage over 72 kV that the flash of LFA gab 0.5 cm is longer than LFA single gap.