Abstract
Inrush current which is sometimes known as surge, or transient current is the current drawn by electrical machine or electrically operated equipment when it is first powered by an ac or dc mains which is independent on the amount of voltage supplied. This inrush current can cause sags that trip loads. When transformer is energized, the inrush current causes harmonics which can excite system resonances and cause dynamic overvoltage. The study becomes necessary because of the negative effects on transformer. This paper investigated the effect of switching angles of the flux waveform and the effect of switching angle variation on the amplitude of inrush current waveform of through Matlab simulation.
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