The single phase energy meter is equipped according to the load power. The single-phase electric current is 4.5A per kilowatt, and the meter range is configured according to 1.2-1.5 times the total current. For example: a family with a total power of 4KW and a current of 18A can be equipped with a 5A meter.

Transformers, also known as instrument transformers, are the collective term for current transformers and voltage transformers. It can turn high voltage into low voltage and large current into small current for measurement or protection system. Its function is mainly to convert high voltage or large current into standard low voltage or standard small current in proportion to realize the standardization and miniaturization of measuring instruments, protection equipment and automatic control equipment. At the same time, transformers can also be used to isolate high-voltage systems to ensure the safety of people and equipment.

The reset card is only available in the watch manufacturer. It is used for resetting the old table or faulty table as the name suggests: the reset card means: clearing the data that has been taken to the new table, but it cannot be used and the corresponding setting card can be inserted into the real A new table in the sense. The electricity purchase card is only for electricity purchase! Please adopt! The phenomenon you said exists: any card is recognized before the new watch is inserted, and only the first card is recognized. Even if it is wrong, you can purchase electricity normally. prepaid electricity meter is just that the two wrong households in the actual computer have to replace the watch corresponding to one household changing the watch.