This paper presents the reasons leading to switch overvoltage for vacuum circuit breaker, and then discusses the usual overvoltage protection device in the small hydropower station.
通过对真空断路器操作过电压成因的阐述，探讨小水电领域内常用的过电压保护设备。
In addition, startup protection circuit and overvoltage protection circuit is also designed, which raise stability of power device IGBT further, thus strengthen the ability to deal with trouble.
另外，设计了启动保护电路和过压保护电路，保护电路进一步提高了功率器件IGBT工作的稳定性，从而增强了处理故障的能力。
To assure person and device, the overvoltage protection is necessary.
为保证设备和人员安全，必需设置过电压保护。
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