Parameter Simulation Of Impulse Current Generator For SPD Test

As a large amount of surge protective devices (SPD) are being used in our daily life, the test of SPD energy endurance becomes more and more important. So the impulse current generator is seriously needed. The impulse current generator which can generate high impulse current is used in the test of electromagnetism compatibility and resistant-sustainable ability of electric implement fulminous. Moreover, it is used in the fields of nuclear physics, accelerator and laser industry.The main contributions of this paper are as follows:Protel software, Matlab and Visual Basic programmable language were employed to simulate the main circuit. The parameters of the main discharge circuit with standard waveform of 8/20us,1/10us,10/350us,2000us were obtained. The relationship among circuit parameters, loads and waveform parameters of impulse current, operating voltage,virtual front time and virtual time to half value were discussed, and the designing principles of impulse current generator were obtained from this research. According to the IEC standard and the basic circuit theory, the decouple network circuits were designed,the method of selecting circuit parameters were provided and the circuits were simulated. The results of simulations proved that the theoretical design is correct. Protection control method of on-line impulse current test system was suggested in this paper. A phase tracking technique was used. The tracker can track the applied alternating current phase in scope of 0o -360o and be triggered synchronously. The trigger error didn't exceed 5o , which met the requirement of national standard. The discharge was controlled by a high voltage field distortion spark gap. The current measurement of the impulse current generator by Rogowski coil was discussed in this paper. The response characters of amplitude and frequency of the coil were also analyzed.