Intelligent control system for circuit breaker

The invention provides an intelligent control system for a circuit breaker. The intelligent control system comprises the components of a CPU control circuit; a grid voltage sampling circuit which is electrically connected with a grid power supply and is electrically connected with the CPU control circuit; a circuit breaker position sampling circuit which is electrically connected with the CPU control circuit; a motor driving circuit which is electrically connected with the CPU control circuit; a DC motor which is electrically connected with the motor driving circuit and is connected with the circuit breaker; and a switch power supply circuit which is electrically connected with the CPU control circuit, the circuit breaker position sampling circuit, the motor driving circuit and the DC motor. According to the intelligent control system, when power failure, voltage loss or over-voltage of a commercial power grid is detected and after time delaying by a certain period is performed, connection between the commercial power and a load is automatically switched off so that a distributed grid-connected power generating system is separated from the commercial power grid. When the voltage ofthe commercial power grid is normal, the commercial power grid is connected with the load, and furthermore the distributed grid-connected power generating system is connected with the power grid. Theintelligent control system settles a defect of easy islanding effect in the power grid when the distributed grid-connected power generating system is connected with the commercial power, thereby improving stability and safety in operation of the power grid.