A 460-V 60-Hz four-pole Y-connected induction motor is rated at 25 hp. The equivalent circuit parameters are R1 = 0.15 Ω, R2 = 0.154 Ω, XM = 20 Ω, X1 = 0.852 Ω, and X2 = 1.066 Ω.
The rotor power factor is found using θ = tan-1(X2/R2/s) = tan-1(1.066/7.7) = 7.88° and PF = cos(7.88°) = 0.991 and is stated to be lagging.
Why is the power factor lagging and not leading? I thought if the angle was positive, the power factor is leading.