A Complex Method to Restrict Re-striking Over-voltage

When vacuum switches switch off shunt capacitors, re striking over voltage may be brought about and threaten the insulation of the equipments severely. The principle of the RC device is analyzed. The method to determine the parameters is presented. The complex method to restrict re striking over voltage with RC device and MOA is put forward. Re striking over voltage and its precaution are simulated with Electromagnetic Transient Program (EMTP). The results show that this method can reduce the re striking over voltage.