electrical energy meter
TRANSCRIPT
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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
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• A device that measure the amount of electrical energy consumed by electrically Powered devices.
What is electrical energy meter?
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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 .
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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
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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.
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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.
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Electromechanical energy meter continue…
Disk to rotate
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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.
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Electromechanical energy meter continue…
Connection Diagram
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Electromechanical energy meter continue…
Working formula
𝑃=3600∗ h𝐾
𝑡
Where = Power in watts = The amount of energy represented by one revolution of the disc
in units of watt-hours per revolution . = time in seconds taken by the disc to complete one revolution,
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Electromechanical energy meter continue…
Example : if one revolution take 16 seconds . what is the power when kh=8 watt-hrs.?
Time t = 16Kh = 8 [in units of watt-hours per revolution] then
So power =1800 watts or 1.8Kwh or 1.8 unit energy.
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Electronic Energy Meter (EEM)
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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).
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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 .
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Electronic or Smart energy meter
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Electronic or Smart energy meter
All of those use various smart embedded System for different features like GSM, Wi-fi ,Prepaid system etc.
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Electronic or Smart energy meter
Block Diagram of digital energy meter
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Block diagram of GPS based energy meter
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Thank you