Research On Measurement And Control System For Vacuum Circuit-breaker With Permanent Magnetic Actuator And Synchronous Closing Technique

First, a system for measurement and control, composed of single-chip 80C196 with its peripheral circuit, is designed in this paper. The peripheral circuit includes charge and discharge circuit of permanent magnetic actuator (PMA), extended circuit of memory, interface circuit of keyboard and display system, and interface circuit of input and output signal. The program is written by assemble language to control the movement of the vacuum circuit breaker with PMA. The program also can monitor the environmental temperature, control voltage, closing displacement, zero point of contactor voltage.Secondly, the synchronous closing for PMA is discussed in this paper. According to calculation, synchronous closing can reduce the value of over-current and over-voltage in the closing transient process. The closing of capacitor is taken as an example to analyze movement process of synchronous closing. It also analyzes the impact of pre-strike characteristic, environmental temperature and control voltage on synchronous closing.Finally, many experiments have been pursued to measure the closing time under different temperature and control voltage by the control system designed in the paper, and a lot of experiment data has been gained. Some of them are used to train and establish a BP neural net, and the others are used to test the function of the neural net. The establishment of the model creates an advantageous condition for the realization of synchronous closing.