One circuit alarm phase

  
3-phase power, would endanger the electrical equipment (especially asynchronous motor) security, in order to detect phase failure, it can be made with a broken alarm. Circuit s
One circuit alarm phase - schematic

hown in Figure 13-110. When the power supply is normal, A point voltage about as ov, no alarm; when phase loss (one phase or two-phase), A point voltage increases, the signal H is lit, bells HA alarm.




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