Energy Meter or Watt-Hour Meter is an electrical instrument that measures the amount of electrical energy used by the consumers. Utilities are one of the electrical departments, which install these instruments at every place like homes, industries, organizations, commercial buildings to charge for the electricity consumption by loads such as lights, fans, refrigerator, and other home appliances.
The basic unit of power is watts and it is measured by using a watt meter. One thousand watts make one kilowatt. If one uses one kilowatt in one-hour duration, one unit of energy gets consumed. So energy meters measure the rapid voltage and currents, calculate their product and give instantaneous power. This power is integrated over a time interval, which gives the energy utilized over that time period.
Two types:-
Two types:-
Electromechanical:Here the Reading directly indicates yo ur consumption. |
Electronic Meter:Here kWh Reading indicates our consu mption. |
SINGLE PHASE
Here you can see various readings like voltage,power factor,ampere,kVA,kWh ..etc.The reading in which kWh is seen on the right bottom side of meter display indicates our usage of electricity.
The difference between the this readings in specified time interval is our consumption.
Here consumption=kWH=T1kWh+T2kWh+T3kWh(approximate)
Where T1, T2 and T3 are different times of the day(TOD).
T1=6.00 am to 6.00 pm (Normal)
T2=6.00 pm to 10.00 pm (Peak)
T3=10.00 pm to 6.00 am (Off Peak)
THREE PHASE
THREE PHASE CkWH |
THREE PHASE CkWh T1 |
THREE PHASE CkWh T2 |
THREE PHASE CkWhT3 |
Here also we can find the above mentioned readings of all the three phases.The reading CkWh(Cumulative Kilowatt Hour)in right bottom side of the display shows our total consumed unit of energy.
Here consumption=CkWH=CkWhT1+CkWhT2+CkWhT3
Here consumption=CkWH=CkWhT1+CkWhT2+CkWhT3
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