Every household has an electric energy meter, and the single-phase electric energy meter is one of the more popular electric energy meters, so do you know the working principle of a single phase energy meter ?
A single-phase energy meter uses electronic circuits and chips to measure electrical energy. A voltage divider or a voltage transformer is used to turn the voltage signal into a small signal that can be used for electronic measurement. A shunt or current transformer is used to turn the current signal into a small signal that can be used for electronic measurement. Electronically measured small signals, using a dedicated energy measurement chip to perform analog or digital multiplication of the converted voltage and current signals, accumulate the electrical energy and output a pulse signal whose frequency is proportional to the electrical energy. The pulse signal drives the stepping motor to drive the mechanical counter to display or send it to the computer for processing and digital display.
The general electric energy meters, including some mechanical kWh meter , have similar principles, but some watt-hour meters have better functions and accuracy.