Electrical and Electronics Measurements Measurement of Power Measurement of AC Power

Measurement of power factor for balanced load by two wattmeters for lagging power factor is:

1
\(\tan \phi = \sqrt 3 \left( {\frac{{{W_1} + {W_2}}}{{{W_1} - {W_2}}}} \right)\)
2
\(\tan \phi = - \sqrt 3 \left( {\frac{{{W_1} - {W_2}}}{{{W_1} + {W_2}}}} \right)\)
3
\(\tan \phi = \sqrt 3 \left( {\frac{{{W_1} - {W_2}}}{{{W_1} + {W_2}}}} \right)\)
4
\(\tan \phi = - \sqrt 3 \left( {\frac{{{W_1} + {W_2}}}{{{W_1} - {W_2}}}} \right)\)

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