Question
Download Solution PDFWhat is the correction factor of the wattmeter at a lagging power factor?
(Where, φ is the phase angle between the voltage applied to the pressure coil and the current in the current coil and β is the angle between the voltage applied to the pressure coil and the current in the pressure coil.)
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCorrection factor: The ratio of True reading (W t ) to Actual reading (W a ) is known as Correction factor of the wattmeter.
W t = \(\frac{VI_1}{R}Cos(\phi)\)
and, Wa = \({\frac{VI_1}{R}Cos(\alpha)Cos(\phi-\beta)}\)
Where φ is the phase angle between the voltage applied to the pressure coil and the current in the current coil and β is the angle between the voltage applied to the pressure coil and the current in the pressure coil
Correction factor = \(\frac{\frac{VI_1}{R}Cos(\phi)}{\frac{VI_1}{R}Cos(\beta)Cos(\phi-\beta)}\)= \(\frac{Cos(\phi)}{Cos(\beta)Cos(\phi-\beta)}\)
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