中文摘要：

为将真空断路器应用于更高电压等级,多断口真空断路器的研究成为行业内的热点问题。在分析总结此前研究成果的基础上,设计了一种由3个光控真空断路器模块（FCVIM）串联组成的126 k V真空断路器。断路器按照U形方式串联光控真空断路器模块,光控真空断路器模块主要由外绝缘部件、真空灭弧室、均压电容、永磁操动机构及其控制器和操动电源等部分组成,在低电位通过光纤控制技术对工作于高电位的永磁操动机构进行控制。对三断口真空断路器和单断口真空断路器模块分别施加雷电冲击电压,结果显示三断口真空断路器相对单断口真空断路器的击穿电压增益倍数为1.59;在并联不同均压电容和人为制造三断口不同步分断情况下研究三断口真空断路器暂态电压分布特性,发现低分散性操动机构和均压电容的应用可以有效提高其开断能力。三断口真空断路器在额定电压下成功开断40 k A短路电流,在不同试验方式下完成重合闸操作,并已顺利通过挂网试运行。

英文摘要：

In order to apply vacuum circuit breakers to higher voltage, the research of multiple-break vacuum circuit breaker has become a hot issue in the high voltage switch industry. Based on the analysis of previous work, a 126 kV VCB with triple breaks based on fiber-controlled vacuum interrupter modules （FCVIMs） in series is presented . An FCVIM is composed of its own outer insulation, vacuum interrupter, permanent magnetic actuator with its controller and power supply. In order to apply a VCB with multiple breaks to higher voltages, the fiber-controlled vacuum interrupter module can be placed in series just like the building blocks. The fiber-controlled technology is used to control the mod- ules at the low voltage area while permanent magnetic actuator operates at the high voltage area. Dielectric insulation experiments were carried out on the FCVIM and the VCB with triple breaks based on FCVIMs in series under lightning impulse voltage. Results show that the breakdown voltage improvement factor of 126 kV VCB with three breaks in series is 1.59 higher than VCB with single break. Moreover, the transient voltage distribution of VCB with triple breaks under situation of different grading capacitors and unsynchronized action among three breaks were tested. The results show that the breaking capacity can be effectively improved with the application of grading capacitors and low dispersion actuator. The VCB with three breaks can interrupt 40 kA short circuit current at the rated voltage and perform the reclosing opera- tion under different test modes. The net operation test has been successfully completed.