Problems in the design and application of ZW32 vacuum circuit breaker
1 product profiles
ZW32 vacuum circuit breaker with the rapid development of city network rural reform of China's electric power system, the electric power department and users urgently need a high performance outdoor column circuit breaker, still in use on the column oil circuit breaker, the interrupting performance is poor, prone to fire and explosion hazard; at the end of 80s in China some manufacturers have developed a column of oil immersed type vacuum circuit breaker, the performance has been improving but still not get rid of relying on insulating oil, still can not meet the present requirements of electrical equipment without oil, at the beginning of 90s, Huazhong University of science and technology and related manufacturers, successfully developed ZW6 - 12/630 - 16 (20) type column vacuum circuit breaker, this is a kind of no oil, insulation performance and can meet the requirements for outdoor use, open outdoor vacuum circuit breaker breaking capacity is high and the other is beautiful, to replace the oil column Column and oil immersed vacuum circuit breaker.
This type of circuit breaker adopts three-phase common box metal shell or stainless steel shell (Figure 1), the internal use of solid composite insulation structure, as well as external insulation and stress and supporting role, using silica gel or outsourcing large creepage distance ceramic shell interrupter of vacuum interrupter, for rod brake driving. The umbrella group of silicone insulation, effectively solve the outdoor vacuum circuit breaker insulation and anti contamination of extraterrestrial. Any product has a gradually improving and perfecting process, at the beginning of the design of circuit breaker has some problems affect the product quality in the manufacturing process to the factory gradually improved and perfect, in order to make it a better product. Therefore, the shortcomings of this product and how to improve it is a problem that manufacturers need to seriously consider and solve. In addition, some problems still need to be discussed in the process of product use are discussed.
2, problems discussed
ZW32 vacuum circuit breaker shell with a certain thickness of the steel plate, the strength is certainly enough, but also poses a problem, is to use a certain number of years after the metal shell exposed to wind and rain, rust mottled, ugly, re painting, on the rod operation is quite difficult, so users should not maintain, strong demand for stainless steel shell beautiful appearance, and no maintenance, so we use the stainless steel shell, but also a new problem, namely: the mechanical strength of stainless steel plate than the metal plate, and the bearing spindle is fixed on a steel plate, if the plate strength is not enough, the forces closing (contact pressure of vacuum interrupter the), bearing the force, the result is not enough to make the stainless steel plate strength deflection, deflection is the result of changes in the parameters of the vacuum circuit breaker, And the performance becomes unstable, because the change of the deflection increases with the increase of the number of turns on and off, which makes the parameter change of the circuit breaker increase, and finally makes the product become unqualified.
In order to solve the stainless steel strength is not enough and the formation of the deflection problem, must be of stainless steel plate reinforcement, the reinforcement method with support ribs, and make the stainless steel shell is formed due to be made one, the box has a certain length, in order to increase the effect, in the middle part of the box body and the insulating supporting rod, it is like the ZN28 indoor vacuum switch under the support between the insulating supporting rod, the effect is satisfactory.
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