Times of rated short - circuit breaking current time : 12 rated operating order : break - 0 . 3s - close , break - 180s - close , break 额定短路开断电流开断次数次： 12
Based on the comprehensive study on contact erosion and massive tests , it is found that the erosion of cb contacts is dominantly depend on the arcing time and breaking current . this paper analyses the mechanism of electrical arc of vacuum circuit breaker and discusses the primary factores . then this paper put forwardes a way to prognosticates the life exepctancy of electrical endurance of vacuum circuit breaker base on the power of arc 本文分析了真空断路器的燃弧机理，探讨了影响真空断路器电寿命的主要因素，指出了原先以开断电流作为预测真空断路器电寿命的方法的不足，提出了改进的以燃弧能量为主要指标的预测方法。
A new double - pole axial magnetic field contact design and its characteristics are introduced . the double - pole amf contact not only can generate very strong amf but also has better fielduniformity . it is applied to the vacuum interrupter which is in the high rated short - circuit breaking current with the high rated current . the basic operational principle of the new contact design is researched 本文描述了一种新型线圈式两极纵向磁场触头结构真空灭弧室的设计及其特性,该线圈式两极纵向磁场触头不但能够产生很强的纵向磁场,而且较均匀,尤其适用于额定短路开断电流大、额定电流大的真空灭弧室。
