Restrike Modeling of Vacuum Circuit Breaker Switching Off Shunt Capacitor Banks with EMTP

Abstract:

The shunt power capacitors are used as a reactive compensator while vacuum circuit breakers are used to switch shunt capacitors in power grid. To research the high over-voltage during switching off the shunt capacitors and a vacuum circuit beaker restriked, the restriking model is built with three-phase vacuum circuit breakers, considering the capacitors’ energy storage characteristic and asynchronous operating. The over-voltage is harmful to the insulation and life-circle of the equipments and even threatens power system safe and stabile operation. The variation trends of both recovery voltage between the contacts and the capacitors voltage are theoretically deduced. The model based on a 220kV substation of Guangdong grid was built and the most serious case that breakers are restriked in two phases are numbered with EMTP. Compared with theoretical results, simulation results are valid and practical.

• Periodical: Advanced Materials Research (Volumes 383-390)
• Pages: 2287-2292
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.383-390.2287
• Online since: November 2011
• Authors: Yong Yuan Wang, Sheng Hui Liu, Wen Ze Liu, Ke Ying Wang
• Keywords: EMTP, Over-Voltage, Power Capacitors Bank, Restriking Model, Vacuum Circuit Breaker

References

[1] P. Kundur, Power system stability and control. CEPP, Beijing, (2001).

[2] NI Xue-feng, SHENG Guo-zhao, LIN Hao. Operation and improving suggestion for power capacitor in China. Electrical Equipment. 2004, vol. 5, no. 9, pp.10-13.

[3] PING Shao-xun Power system internal overvoltage protection and examples analysis[M]. China Electric Power Press. 2006 (Chinese).

[4] LIU Wen-ze, CAI Ze-xiang, FENG shun-ping. Resonant Analysis and EMTP Model Simulation of Grid Harmonics in Transformer Substation[J]. Power Capacitor & Reactive Power Compensation, 2009. 2: 18-20 (Chinese).

[5] XU Guo-zheng, Zhang Jie-rong, Qian Li etc. Principle and Application of High-voltage Circuit Breaker [M]. Tsinghua University Press. 2000. 6 (Chinese).

[6] R. Natarajan. Power System Capacitor. China Machine Press, Beijing, 2007 (Chinese).

[7] Martin Bishop, Tim Day, Arvind Chaudhary. A primer on capacitor bank protection, IEEE Trans. on Industry Applications, vol. 37, no. 4, pp.1174-1179, Jul. (2001).

DOI: 10.1109/28.936411

[8] P. Cygan and J. R. Laghari. Models for insulation aging under electrical and thermal multistress, IEEE Trans. Dielectrics Electrical Insulation, vol. 25, no. 5, pp.923-934, Oct. (1990).

DOI: 10.1109/14.59867