meter constructions, parameters etc
DESCRIPTION
CEB metersTRANSCRIPT
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Electricity Metering
Energy Management Branch – WPN08th February 2013
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Overview of Topics
1. Introduction to electricity metering
2. Classification of electricity meters based on technology
3. Working principles, metering concepts
4. Net metering & Forward metering
5. Metering errors and meter tampers
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Overview of Topics cont’d
6. Meter Testing, Meter Test Benches and Equipment
7. Distribution loss reduction through metering
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3. Working principles and metering concepts
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1. Voltage Coil – High impedance element
2. Current Coil – Low Impedance element
3. Stator – Concentrate and confines magnetic
filed
4. Aluminium rotor disk
5. Brake magnet
6. Spindle with worm gear
7. Display registers
Principle of Operation
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Ferraris meter construction
Voltage element
Current element
Rotor
Disc speed proportional to power
p = u . i
u
i
u
i
x x
v = u • i •k
Voltage element
Current element
Disc
Metering unit 2
Metering unit 1 Metering unit 3
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Electronic/ Static meters
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Smart meters – block diagram
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Measurement parameters of meters
• Active energy, kWh, MWh
• Reactive energy, kVarh, MVarh
• Apparent Energy, kVah, Mvah
• Maximum demand
(15-minute average Apparent/ Active power)
Power Triangle -
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1.2 Metering Terminology cont’d
Four Quadrant energy measurement
Q 1 - Active energy import, pf laggingQ 2 - Active energy export, pf laggingQ 3 - Active energy export, pf leadingQ 2 - Active energy import, pf leading
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