Application Of PIC Monolithic Computer In Supervisory Of Permanent Magnetic Actuator For Low-Voltage Circuit Breaker

The low-voltage circuit breaker is one of the main electric apparatus switches in the low-voltage power distribution network, It can put through and disconnect not only normal load current and overload current but also short current. It is mainly used in the frequently operated low-voltage power distribution line or cubicle switchboard and served as power switch, and protect circuit, electric equipment, etc, When they take place overcurrent, overload, shorting out, loss of phase, leaking electricity, etc, it can cut off the circuit automatically, so it is used widely. The intellectual controller is a protector of the breaker, and is a key control device of the circuit breaker too.In the 1990s, with the development at full speed of electric and electronic technology, microelectric technique, computer technology and conununication technology, the protector of the circuit breaker has already been lead by traditional electromagnetism release to develop into a electronic release which adopts the integrated circuit, until presenting the intellectual controller with high performance microprocessor at present. The intellectual controller of new generation adopts the module structural design, incorporate functions, such as measurement, monitoring, controlling, communication, protecting, etc. into an organic whole, widely used in the low-voltage system.Among this subject, this intellectual controller regards PIC chip which MICROCHIP Company produces as the key processor on the hardware, it is mainly deal with trouble protection in circuit breaker and gathering data in real time, The real-time current and information of faults can be shown. The high-capability picl8f448 SCM with CAN interface is used for designing the CAN bus interface. In this paper, the hardware circuit and the software flow are given. the hardware design of this circuit is easy, the reliability is high and real time is good. It has realized the two-way communication function between the intellectual controller and PC, Achieves the purpose of remote control and remote adjust through field bus system, makes performance strengthen of the intellectual controller, accord with the demands for distribution system.