Research on Comprehensive Closing Protection for Capacitor based on ATP/EMTP

Aiming at solving the problem of dash current and over voltage of parallel reactive compensation capacitor group in power system ,this paper research on the phase control synchronous switch and the current-limiting reactor .With the of Huangti system, which involves both of the protection tools, Simulation result demonstrates that dash current and the over voltage would be limited by the corporation of the phase control synchronous switch and the current-limiting reactor. In recent years, with the increase in network capacity, reactive power compensation capacitors are increasingly being used. In order to maintain the stability of system voltage, substation requires frequent switching reactive power compensation capacitors.When inputting capacitors, it will produce flow. Meanwhile, when the inputting capacitor group, there is a transient process. So the capacitor over-voltage is generated. In this paper, using ATP / EMTP simulation software, with the introduction of series reactors and synchronous closing device principle(1,2), uses the Huangti system as an example to simulate and get the result of inputting operation over-voltage and the surge before and after taking protection measures. The simulation results show that both surge current, and the over-voltage can be effectively limited. The simulation results altogether prove the effectiveness of comprehensive protection.