钻井作业期间不能合闸。

Don't switch on during drilling operation.

装置的相关硬件和软件设计保证了合闸瞬间的相位差小于允许合闸相角差。

The design of the hardware and software ensures the breaker closing at the just moment of zero- differential phase.

介绍了低压电器产品试验中选相合闸开关的应用。

The application of phase selection close switch in low voltage electrical apparatus test was introduced.

同时还可以模拟保护对线路的跳闸、重合闸等操作。

And also, trip and auto close operation of relay can be simulated.

敬告：欠电压脱扣器必须先通电，断路器才能再扣及合闸。否则将损坏断路器！

Caution: under-voltage release must be electricity, circuit breaker can be closed, otherwise will damage circuit breaker!