Method to determine wave resistance of impulse voltage generator for lightning impulse test
Xuan Yao-we · Journal of Mechanical & Electrical Engineering · 2014
In the lightning impulse test,the wave resistance( front resistance denoted by Rfand time to half-value resistance denoted by Rt) of impulse voltage generator should be adjusted in order to make the impulse waveform comply with the standard of IEC 60060-1: the standard waveform should have a front time denoted by tfof 1. 2 μs with the tolerance is ± 30% and a time to half-value denoted by ttof 50 μs with the tolerance is ± 20%. Aiming at determining the wave resistance of impulse voltage generator quickly,the equivalent discharging circuit of the impulse voltage generator was analyzed mathematically,then non-linear equations for solving Rfand Rtwere established and solved by hybrid genetic algorithm. After obtaining the numerical solution of Rfand Rt,the discharge circuit was simulated and analyzed by using Matlab. Finally,the field test was carried out in the high voltage test hall to verify the simulation results. The results indicate that the method to determine the wave resistance is effective,and can provide theoretical guidance for field test personnel to reduce the equipment debugging time.