Study On Reliability Test Device Of Instantanous Protact Of Miniature Circuit Breaker

Miniature circuit breakers, one kind of protective electrical apparatus, are mainly used in household and industrial installations and distribution system for overload and short circuit protection. Their reliability level directly influences the power supply in house and industrial installations, the safety of facilities in distribution system, so the application of miniature circuit breakers is relative with our lives. The reliability of them, especially instantaneous protection character does not meet to the need of production and life, they will bring troubles to users and even result in extremely serious loss if their reliability degree is low. Because it is short in the research for instantaneous protecting test ?pparatus of miniature circuit breakers, and moreover by document retrieval, the theory of reliability on mini-breakers is less than the one on relays, and sophisticated theories or achievement in scientific research, which have been put into production, are not too much, so it is significant to study the instantaneous protecting reliability of miniature circuit breakers.According to theories, which have come into being, on the base of the characteristic and failure modes of miniature circuit breakers, the paper adopts success rate as its instantaneous protecting reliability characteristic parameters. And time-intercepting test scheme is applied as the one of instantaneous protecting reliability of miniature circuit breakers. To meet the function and the precision of the test apparatus the paper provides the hardware design and the software design, and points out a few facts which would affluence the precision of the apparatus and the method how to reduce the error test data, at last it calculates the error of this test device.On the base of the reliability test device of miniature circuit breakers which has been performed by electric apparatus institute in Hebei university of Technology, this paper completes the hardware, promotes the function of the application software, adopts the high-performance DAS card with programmable gain to fulfill the computer control over generating big test current and the automatic adjusting voltage device, realizes that computer automatically operates the set of device.