The transformer collar in Yantai city has dropped, and it needs to be paid to find an electrician to close it.

No need. Yantai transformer transformer is a device to change AC voltage by electromagnetic induction principle. The main components are primary coil, secondary coil and iron core. The transformer is turned off and on again, and the electrician is not paid. It belongs to after-sales service. Transformer ring is a tool to close the circuit breaker. The main functions of transformer are voltage conversion, current conversion, impedance conversion, isolation, voltage stabilization (magnetic saturation transformer) and so on.