Abstract
In this paper, ATPDraw software is used to simulate the opening overvoltage and its suppression of 750 kV no-load transmission line under arc non reignition and arc multiple reignition. The simulation results show that when the arc is not reburning, the over-voltage amplitude caused by opening operation will increase, and the maximum amplitude is about 1.2 times of the power supply voltage amplitude. when arc reburning occurs, the amplitude of overvoltage will increase rapidly at the moment of contact reburning. With the increase of arc reburning times, the amplitude of no-load opening overvoltage is greater. Installation of shunt reactors at both ends of the line reduces the possibility of arc re ignition and the opening overvoltage. Using arrester is one of the effective measures to limit opening overvoltage.
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