光控真空断路器模块低功耗自具电源设计

Design of Low Power Self-supplying Power Source Module of Fiber-controlled Vacuum Interrupter Module

光控真空断路器模块应用于多断口真空断路器对电源可靠性和低功耗提出了更高的要求,为此进行了光控真空断路器模块低功耗自具电源模块设计。分析了自具电源的工作原理,优化设计了其取电电磁感应线圈(取电CT)的结构。电容器充电模块从电路结构,器件选型,转变工作方式等降低其工作时损耗。建立了永磁机构操动电容充放电特性模型,分析得到低损耗的最佳间歇控制策略。进行了智能控制器低功耗设计,实现了在线低功耗控制策略和离线休眠工作方式。最后通过试验验证,优化后的取电CT工作范围在200 A～3 000 A,满足在线自具电源模块工作,整体自具电源正常工作时损耗做到了300 mW,满足电网停电3周,自具电源系统仍能驱动光控真空断路器动作。设计的自具电源满足系统对断路器的可靠性和智能性的要求。

Applying fibercontrolled vacuum interrupter module （FCVIM） to multibreaker vacuum circuit breakers raises high requirements of reliability and low power consumption in power supply. Therefore, we designed a lowpower selfsupplying power source module （LPSSP） for FCVIM. After analyzing the mechanism of the LPSSP, we optimized the structure of LPSSP＇s powering electromagnetic induction coil （which is named as ＇power CT＇）, so the power loss of the power CT＇s charging circuit of capacitor was reduced due to the changes in circuit configuration, component type and working mode. Moreover, we established a numerical model of the permanent magnetic mechanism driven by LPSSP to study its charge and discharge characteristics so as to obtain an optimized lowpower control strategy. With this strategy in an intelligent controller, the online lowpower control and offline resting of LPSSP was realized. Experimental results indicate that the optimized power CT works in a range between 200 A and 3 000 A, which fulfils the requirements of LPSSP, and the power loss of the LPSSP is below 300 mW. Therefore the LPSSP can drive the permanent magnetic me chanism even the power from network is off for three weeks, and it satisfies the circuit breakers＇ requirements of reliability and intellectuality.