Three-phase four-wire energy meter power supply, can you take power on the line after the transformer?
For mechanical electric energy meter, the input voltage is 380V, the input current is 1~5A three-phase four-wire meter is OK, there is also a three-phase four-wire electric energy meter voltage coil working voltage is 100V, this electric energy meter must Configure three dedicated voltage transformers to supply 100V voltage to the coil of the energy meter. This three-phase four-wire electric energy meter cannot connect to the input voltage, otherwise the electric energy meter will be burnt. And the current transformers of the three-phase four-wire energy meter are only dedicated to the current coil current coils, they are not able to supply the voltage coil of the energy meter to work. The standard connection is connected to P1 (incoming side) of the current transformer. Although the coil of the electric energy meter is only about 3~5VA, it is connected to the back of the current transformer for a long time, and the power consumption of the voltage coil is also measured.