Question
Download Solution PDFThe constant load current for a 230 V single phase energy metre is 20 A at unity power factor. If the meter disc makes 2300 revolutions for 2 hours the meter constant will be ______.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept
The meter constant of a 1ϕ energy meter is given by:
\(Meter \space constant\space = {No. \space of \space revolutions \space in \space 1 \space hr\over No. \space of \space kW \space in \space 1 \space hr}\)
Calculation
Given, V = 230 volt
I = 20 A
cos ϕ = 1
P = VI cos ϕ
P = 230 × 20 × 1 = 4.6 kW
No. of revolutions in 1 hr = 2300/2 = 1150
\(Meter \space constant\space = {1150 \over 4.6}\)
Meter constant = 250 revolutions / kWh
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