How do property companies pre-charge electricity meters with transformers?

Transformer can convert high voltage or high current into standard voltage or standard current according to the relevant proportion, thus playing the role of protecting the circuit system. In addition, the transformer can also isolate the high voltage system, thus protecting personal safety and equipment safety. For electric meters with transformers, it is generally necessary to calculate the electricity fee according to the relevant calculation formula. The calculation formula is as follows: the actual electricity fee payable for electric meters with transformers = the unit price of local electricity fee x the actual electricity consumption value of this month x the transformation ratio. Among them, the actual electricity consumption value of this month refers to the difference between the electricity meter value of last month and this month.