Study and development on the test equipment of the AC imposed with the switching overvoltage

To reappear the switching overvoltage in the electrical power system, a simulation test equipment which the switching overvoltage superimposed on the AC was designed. The test equipment consist of a switching overvoltage generator, a AC generating circuit, a coupling capacitor and a ignition control system. The coupling capacitor which between the AC generating circuit and the switching overvoltage generator can make the switching overvoltage superimposed on the AC, and the ignition control system can control the phase of the AC which the switching overvoltage superimposed on. The structure and principle of the test equipment were analyzed and the circuit parameters of the test equipment were calculated. The experimental results show that the test equipment can make the switching overvoltage superimposed on the AC by phasor and the phase which the switching overvoltage superimposed on the AC can be controlled, the ignition delay time of the test equipment is 1.4 ms.