Since the internal structure of the watt-hour meter can not satisfy the insulation strength of arc generated by automatic pulling and closing

and the resistance of three - phase closing is large

the existing three-phase power users can only rely on manual operation of external load switch to send power on site after arrears tripping

which is inefficient. After tripping in arrears of three phase fee-controlled switch

and when the user renews the fee

the self-feeding device can send the closing order to the three-phase energy meter through any workstation. The self-feeding device can realize remote automatic closing by relying on its built-in power mechanism or energy storage components

thus completing the closed loop operation of arrears-power off-renewal-closing. The whole process is automated

and the time of re-transmission is shortened.