Analysis and verification of the opening characteristic of DC circuit breaker

ZHANG Peng1, ZHANG Jie1, ZHU Yi2, LI Yanyan1, ZHANG Zhibin1, CAO Shanjun1,
ZHAO Cheng1, ZHAO Yuzhi1

(1.Xuji Group Co. Ltd., Xuchang 461000, China; 2.Economic and technological institute, Chinese Power
Company in Shandong Province, Jinan 250000, China)

Abstract: Aiming at the problem that electric arc was difficult to extinguish in the process of DC circuit breaker interrupting, the interrupt characteristics of the DC circuit breaker were analyzed. How to shorten the combustion time of the arc was analyzed by this paper, and the influence of the time constant on the breaking capacity of the circuit breaker, the rising rate of the arc current and the relationship between the current of the breaker and the arcing time was studied. Based on the above analysis, created a prototype, and open circuit was tested for many times by using high voltage DC test rig simulation about different short circuit fault current of DC circuit breaker, won a lot of experimental data. The results show that the circuit breaker in the rated voltage is DC 1800 V, which can reliably remove fault current to 80 kA, circuit breaker fault current decreases with time constant, arcing time decreases with the increase of breaking current.

Key words: DC circuit breaker；breaking characteristic；the rising rate of the arc current