ABSTRACT: Recently, vacuum circuit breaker has occupied the leading status in the middle-voltage. China has numerous vacuum breaker and the use of it accounts for 80%, especially 7.2KV vacuum circuit breaker has developed the best. At present,7.2KV vacuum circuit breaker in the main has achieved products of nationalization. Even in some aspects it has reached the international advanced standard. 7.2KV vacuum circuit breaker plays a vital role in the development of electrical net, which can not be substituted in the middle circuit breaker field.
The design of vacuum content mainly includes:The research of vacuum extinguishing of arc theory; The design calculation of extinguishing of arc chamber;Contact design;The checking computations of moves and thermo stability, the checking computations of temperature’s going up; The analysis of insulated structure; The selection of holding the drive mechanism and related computation;Assembly drawing.
The design of vacuum extinguishing of arc chamber in this text has entered the research of the massive analyses. The contact uses the-vertical-blow-type extinguishing of arc contact made of CUCR material. The related moves and the thermostat ability, and the checking computations of temperature’s going up, are all up to the national standard. The vibrator unit uses the electromagnetism to hold the drive mechanism. In brief, this design in various respects satisfies the fixed duty and meets the design requirements.
Keywords：Vacuum extinguishing of arc chamber Contact The drive mechanism Design
