220v, 10A dc energy meter
Pressure coil resistance 9900 ohm
Current coil rating 0.5 ohm
i) Direct loading arrangements
by pressure coil in parallel
Ppressure coil = v2/R = 2202/9940 = 11 watts
Power consumed by current coil (in series)
220*10 = 2200 w
Total power (direct loading)
2200 + 11 = 2211 w
ii) Phantom loading
In this current coil is excited separately and pressure coil also Thus, power consumed by pressure coil = v2/R = 2202/9940 = 11 w
But power consumed by current coil = v*i = 6*10= 60w
Total = 60 + 11= 71w
Therefore, phantom loading consume less power than direct loading
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