This document summarizes and compares two types of electrical energy meters: electromechanical induction meters and electronic meters. Electromechanical meters measure energy usage by counting the revolutions of a rotating metal disk driven by magnetic coils related to current and voltage. Electronic meters use digital microchips and circuits to sample current and voltage and calculate power consumption digitally. Electronic meters offer additional features like displaying multiple power readings, remote data transmission, and prepaid billing options.

1. Electrical Energy Meter
Presented By: Group 02
Md.Siddikur Rahman Sarker[06]
Azharul Islam[07]
Md.Majharul Islam[08]
Kazi Mahmudul Hasan[11]
Shahjalal University Of Science And Technology,Sylhet-3114
Dept. Of Electrical And Electronic Engineering

2. • A device that measure the amount of electrical
energy consumed by electrically Powered
devices.
What is electrical energy meter?

3. What Is electrical energy?
• Electrical energy is the product of power (P) and time (t) of how long
the power is consumed or spend.
W= P*t
Unit of measurement : Kilowatt hour
Kilowatt-hour: The amount of energy consumed by
one kilowatt load over the period of one hour .

4. Types of Energy Meter(EM)
 There are two types of EM which works
on different mechanism .
 Electromechanical induction type meter
 Electronic meter or solid state meter

5. Electromechanical energy meter
 Measure energy by counting
revolution of a rotating disk.
 The metal disk is non-magnetic, but
electrically conductive.
 The number of revolutions is
proportional to the energy usage.

6. Electromechanical energy meter
 The disc is acted upon by two sets of coils.
 one coil produce magnetic flux depends on current and other
depends on voltage which lags by 90 o .
 That produce eddy current into disk and force to rotate the disk.
 A permanent magnet exerts an opposing force proportional to
the speed of rotation of the disc.
 The equilibrium between these two opposing forces results the
disc to rotate at a speed proportional to the power usage.
 The disc drives a register mechanism which counts revolutions.

7. Electromechanical energy meter continue…
Disk to rotate

8. 1) Voltage coil - many turns of
fine wire encased in plastic,
connected in parallel with load.
2) Current coil - three turns of
thick wire, connected in series
with load.
3) Stator - concentrates and
confines magnetic field.
4) Aluminium rotor disc.
5) rotor brake magnets.
6) spindle with worm gear.
7) display dials.

9. Electromechanical energy meter continue…
Connection Diagram

10. Electromechanical energy meter continue…
Working formula
𝑃 =
3600 ∗ 𝐾ℎ
𝑡
Where 𝑃 = Power in watts
𝐾ℎ = The amount of energy represented by one revolution of the disc
in units of watt-hours per revolution .
𝑡 = time in seconds taken by the disc to complete one revolution,

11. Electromechanical energy meter continue…
Example : if one revolution take 16 seconds .
what is the power when kh=8 watt-hrs.?
Time t = 16
Kh = 8 [in units of watt-hours per revolution]
then
𝑃 =
3600 ∗ 𝐾ℎ
𝑡
So power =1800 watts or 1.8Kwh or 1.8 unit energy.

12. Electronic Energy Meter (EEM)

13. Electronic Energy Meter (EEM)
How it works?
 Electronic Energy Meter is based on Digital Micro Technology (DMT).
 Functions are controlled by a specially designed IC called ASIC (Application
Specified Integrated Circuit).
 Analogue circuits are also present in EEM to “Sample” current and voltage.
 The ‘Input Data’ (Voltage) is compared with a programmed ‘Reference
Data’ (Voltage) and a ‘Voltage Rate’ is given to the output.
 This output is then converted into ‘Digital Data’ which is converted into
average value.
 Average Value / Mean Value is the measuring unit of power.
 The output of ASIC indicated by the LED as “Pulses”. These pulses are equal
to Average Kilo Watt Hour (kWh / unit).

14. Electronic energy meter
This type of meter has various features
 Display in LCD LED monitors
 Calculate real power, reactive power , apparent power
 Calculate bill in specified tariff plan .
 Send billing information to remote wirelessly .
 Report and record important parameter.
 Some has prepaid features also .

15. Electronic or Smart energy meter

16. Electronic or Smart energy meter
All of those use various smart embedded System for
different features like GSM, Wi-fi ,Prepaid system etc.

17. Electronic or Smart energy meter
Block Diagram of digital energy meter

18. Block diagram of GPS based energy meter

19. Thank you