A Control Device for Synchronized Switch Based on DSP and Vacuum Circuit-breakers with Magnetic Drive

A control device to synchronously sample AC voltage and current and to accurately compute the parameters,including voltage,current,active power,reactive power and power factor,is presented,which is based on the technologies of DSP,CPLD and high-speed A/D converter.By measuring the DC voltage of capacitors,environmental temperature,and historical switch-on and switch-off data of circuit-breakers,the acting time of the circuit-breakers can be predicted with this device,and the synchronous switch of capacitor bank can be realized.Moreover,reactive power can be compensated,and the harm of inrush current and overvoltage can be reduced by using the device with integrated control policy.A number of tests indicate that the dispersion of the device is smaller under similar environment of temperature and voltage,and the circuit-breaker can realize synchronous control through temperature and voltage compensation.