应用CD4098单稳态触发器组成了三相过零触发电路，达到了较为理想的调功效果。
The three-phase zero-detection trigger made up of CD4098 single side stale trigger can produce ideal effect.
在可控硅的实际应用中，经常会遇到可控硅过零触发问题，尤其在三相系统中，这种应用更为常见。
Zero-crossing trigger of SCR is a common problem in the practical application of SCR, especially in three-phrase systems.
保护功能有三段过电流保护、反时限过流保护、三相一次检无压自动重合闸等。
The protection functions include three-section over-current protection, inverse-time over-current protection, three-phase one-shot no-voltage auto-recloser and so on.
三相交流电压检测，过压、欠压、缺相、停电告警，全自动双路交流前换功能；
Voltage detect of three phase AC, the warning of over-voltage, under-voltage, lost phase and power failure, two-way AC circuits switch full-automatically.
三相交流电压检测，过压、欠压、缺相、停电告警，全自动双路交流前换功能；
Voltage detect of three phase AC, the warning of over-voltage, under-voltage, lost phase and power failure, two-way AC circuits switch full-automatically.
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