Page 852 - Basic Electrical Engineering
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Example 11.6 The meter constant of an energy meter is 1200. The meter disc
makes 210 revolutions in one minute when a current of 50 A flows through
the load. The supply voltage is 230 V. Calculate the percentage error of the
meter. Assume unity power factor load.
Solution:
Meter constant = 1200
This means that the disc makes 1200 revolutions per kWh.
Energy consumed in 1 minute
As per meter constant, energy registered in
One minute = = 0.17 kWh
The minus sign indicates that the meter is running slow.
11.12 INSTRUMENT TRANSFORMERS
