Research On Dynamic Characteristics And Control Technology Of High Voltage Vacuum Circuit Breaker

Smart grid has become the latest development of power system. Distribution systemis one of the important research issues. HV circuit breaker with Permanent MagneticActuator (PMA) is a kind of control and protection equipment used in the distributionsystem. It’s intelligence has become a hot research problem. Meanwhile, PMA is a keycomponent of circuit breaker, which has lots of advantages such as fewer parts, higherreliability, free maintenance, better matching performance between the mechanismcharacteristics of PMA and the counterforce characteristics of circuit breaker. Recently,PMA has been extensively focused all over the world. It will be widely used in MV orHV circuit breakers in many countries include China.Firstly, the purpose and significance of researching the intelligent HV vacuumcircuit breaker (VCB) with dual-coil bistable PMA was introduced, and the developmentoverview of VCB with PMA and its control technology at home and abroad werepresented. Secondly, the principle of VCB with dual-coil bistable PMA was studied andits magnetic circuit characters in the process of VCB breaking and closure operation wasanalyzed from a qualitative and quantitative perspective respectively. Thirdly, theoptimization design of PMA was conducted with particle swarm optimization algorithm.A unified objective function model with minimum PWM volume was established byselecting five optimization variables and two constraints. The optimized PMA hassmaller volume and lower cost. On the basis of optimized PWA, the ANSYS simulationresearch was carried. Fourthly, the3D solid model of VCB with PMA was built by usingPro/E software, and the dynamic simulation analysis of mechanical system was made byusing ADAMS software. Lastly, a new type intelligent controller for the VCB withdual-coil bistable PMA was designed. The controller has many functions such asdetection, control, protection, remote control, GPRS wireless communications and so on.The controller consists of storage capacitance charging circuit, capacitance chargingvoltage detection circuit, phase voltage detection circuit, moving core displacementdetection circuit and breaking-closure coil drive circuit. It’s protection function includesthe protection of system over voltage, under voltage, leakage, short-circuit, overloadand open-phase fault. By applying GPRS wireless communication technology, thecontroller can detect the operating parameters of the VCB real-time and remote control its on-off operation. Preliminary tests showed that the controller has perfect functions,better robustness and runs steadily. It can greatly improve the whole performance ofVCB with dual-coil bistable PMA, and meet its intelligent and miniaturizationrequirements.