Bistable Permanent Magnet Of The High-voltage Vacuum Circuit Breaker Mechanism, Intelligent Control Technology

The paper introduces a kind of intellectual control technology of the vacuum circuit breaker with bi-stable permanent magnetic actuator. It bases on a practical project in power system.In this paper, the intellectual control technology of vacuum circuit breaker is discussed particularly. As a control object, the bi-stable permanent magnetic actuator is separated into basic principle so as to determine the nature of the whole. The direct-coupled models of magnetic fields for analysis and for calculation are presented. The static and dynamic characteristics of the models and dynamic behavior analysis for the vacuum circuit breaker with bi-stable permanent magnetic actuator are also discussed. Numerical calculation is adopted to conclude the connection of the inductance, supplying current, movement time of the plunger and the connection of the displacement of the plunger, speed and movement time of the plunger. For a further study, fuzzy neural network control technology based on synchronized-closing operation of vacuum circuit breaker is analyzed and the research conclusion is used for realizing the synchronized-closing of vacuum circuit breaker in the future.According to the demand of market, the control unit based on single-chip microprocessor MSP430F149 for intelligent breaker is focused and many functions such as protection, control, measurement are covered. The signals of currents, voltages, active power and reactive power are monitored in real time. The control unit can not only control opening / closing operation of circuit breaker, but also has the functions of over-current / under-voltage trip, closing / opening interlock for mal-operation and diagnosis and warning for the failure of the operation system.In the end, some results and test data from experiments on the vacuum circuit breaker with intellectual control unit are presented. With the result of experimentation, the reliability of intellectual control unit is verified. Furthermore, some important data are beneficial to further studyon synchronized-closing of vacuum circuit breaker and control theory of permanent magnetic actuator.