Effect of waveform and impulse resistance on lightning performance in distribution system

Abstract

This paper presents the effect of lightning waveform to the voltage at the pole top and back flashover rate (BFOR). The result found that short front time of lightning current waveform or high slope will cause high voltage and back flashover rate at the top pole. However the tail time of lightning current waveform will not effect to the top pole voltage and backflash over rate because the impulse resistance will only affect to the long front time of lightning current waveform. In case of short front time, impulse resistance will not affect to voltage at the pole top and backflash over rate. Moreover BFOR will vary with the event of thunder storms per year. ATP-EMTP is used to simulate cases in this paper to receive pole top voltage, critical current and backflash over rate. The 69 kV subtransmission line system of Metropolitan Electricity Authority (MEA) is demonstrated as the case study to improve its grounding standard of subtransmission and distribution line system in MEA's power system

Effect of piecewise linear current waveforms on surge arrester residual voltage

“…To determine the energy capability of the surge arresters, as well as to assess the failure probability of a surge arrester when lightning strikes in papers [3,[6][7][8][9] were used current waves that rise and decay linearly. In [10], to determine the voltage at the top of transmission line tower when a direct lightning strike, were also used current waves that rise and decay linearly. In [11], to calculate multiple reflections and refractions of an electromagnetic wave in a branched cable distribution network, was used a similar triangular voltage pulse, increasing and decaying linearly.…”

New Simulation Method of Flashover Rate by Connection of EMTP and MATLAB

“…Direct lightning strikes often cause insulation flashover in distribution lines. Lightninginduced voltages are currently a major concern in terms of electromagnetic compatibility and power quality due to the widespread use of sensitive devices connected to distribution lines [1][2][3][4][5][6][7][8]. Therefore, the calculation of flashover rate at specific distribution system configuration is very important for lightning protection.…”