| High voltage circuit breaker is an important switch equipment in power system. It controls and protects the grid. The safety of power system partly depends on the function of HV circuit breaker. Vacuum circuit breaker is widely used as a new type of the high voltage circuit breaker at present. The design of it in China is now on the phase of indraught and analogy, and lack of systemic academic guidance. The academic analysis is carried on as the same time as the design on the spring operating mechanism of the vacuum circuit breaker is accomplished in this thesis. According to the design requirement of the spring operating mechanism for the outdoor vacuum breaker, the design on spring operating mechanism of ZWâ–¡-12/630-20 outdoor HV vacuum breaker is accomplished through the theoretical calculation and test analysis, and the systemic design theory is established. Some key part is ameliorated to meet the demands of working. This thesis mainly includes:(1) Analysing the working principle of the spring operateing mechanism, expatiating the character of the mechanism;(2) With the design aim of the spring operating mechanism, accomplishing the design of ZWâ–¡-12/630-20 outdoor HV vacuum breaker based on the systemic design theory of the spring operating mechanism, which includes spring mechanism of open-close switch; cam mechanism based on the principle of power balance; buckle-off mechanism with force-minished device; ratchet wheel mechanism with number-increased detent;(3) In the design on the spring operating mechanism for the outdoor vacuum breaker, using the air cushion device with speed controller to ensure the steady working of the spring operating mechanism;(4) Accoding the problem of daily maintenance for HV circuitbreaker, giving some effective steps of daily maintenance. This thesis establishes the primary theory of the design on the spring operating mechanism for the outdoor vacuum breaker, and shows the expectation on the futher research work in this area.
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