The basic working principle of the supplier of composite switch is to connect the supplier's switch of silicon controlled rectifier and the supplier of magnetic holding relay to realize voltage zero crossing conduction and current zero crossing cut-off, so that the composite switch has the advantages of zero crossing switching of silicon controlled rectifier switch at the moment of on-off, and contactor during normal on-off The supplier switch has the advantage of no power consumption. The implementation method is as follows: when the voltage is put into operation, the thyristor will be triggered at the moment of zero crossing, and then the supplier of the magnetic holding relay will be switched on after the voltage is stable; when the voltage is cut out, the magnetic holding relay will be disconnected first, and the thyristor will be switched off after the voltage is delayed, so as to realize the current zero crossing cut-off.

1、 Technical index of composite switch

Service life: 100000 times

Phase number: three phase (△ type connection), single phase (Y-type connection)

Control capacity: three phase common compensation ≤ 25 / 30 / 40kvar

Single phase partial compensation: ≤ 10kvar

Power consumption: ≤ 1.5va

Contact voltage drop: ≤ 100mV

Contact withstand voltage: ≥ 1600V

Response time: ≤ 150ms

Interval between on and off: ≥ 1 second

Interval between two consecutive connections: ≥ 120 seconds

2、 Working environment conditions of composite switch

Ambient temperature: - 10 ℃ ~ + 55 ℃;

Relative humidity: 20 [%] to 90 [%] at 40 ℃;

YHK composite switch and inrush free capacitor switching device; kcs1a series dynamic regulator and dynamic compensation regulator.