Question

Explain the construction and principle of operating single phase energy meter.

Answer 1

Construction of AC Energy Meter:

 Energy meters are the basic part to measure the power consumption. It is used everywhere, no matter how big or small consumption it is. It is also known as watt-hour meter.

 Here we discuss the construction and working principle of induction type energy meter.

To understand the structure of watt-hour meter, we must understand the four essential components of the meter. These components are as follows:

1. Driving system

2. Moving system

3. Braking system

4. Registering system

 The components of this system are two silicon steel laminated electromagnets. The upper electromagnet is called shunt magnet and it carries a voltage coil consisting of many turns of thin wire.

 Where as voltage coil is connected to the supply mains and produce a high ratio of inductance to resistance. There is copper bands in the lower part of shunt magnet which provides frictional compensation so that the phase angle between shunt magnet flux and the supply voltage is exactly 90^o .

Types of Watt Hour Meter

Basically, the watt-hour meter is classified into three different types as follows:

 Electromechanical type induction meter

 Electronic energy meter

 Smart energy meters