Research On Vacuum Switches' Switching Overvoltage And Its Protection

When vacuum switches switch off shunt capacitors and HV motors, restriking overvoltage and multi-reburning overvoltage may be brought about and threaten insulation of equipments severely. In this thesis we use Electromagnetic Transient Program (EMTP) to simulate and study those two kinds of overvoltage; and research how to use MOA and RC devices to reduce them basing on multi-exponential MOA model and principle of RC device. At the same time, based on L-R damping principle, researches are made on the feasibility of restricting overvoltage by L-R device. Thus methods of ensuring the parameters of these devices are concluded.Wang Yongqiang (High Voltage and Insulation Technology)Directed by Prof.Cheng Zhonglin...