PE Power Sample Problem 2

A three-phase, wye-connected, balanced load with a 480 V (line voltage) rating consumes 100 kW. What is the new power consumption if one of the load's phases is removed (𝑍𝑍𝑝𝑝ℎ𝑎𝑎𝑎𝑎𝑎𝑎 𝐴𝐴 = 0)? Assume a 1.0 power factor.
(A) 100 kW
(B) 75 kW
(C) 66 kW
(D) 50 kW

Wasim Asghar – P.E, P.ENG, M.ENG

Licensed Professional Engineer in Texas (PE), Florida (PE) and Ontario (P. Eng) with consulting experience in design, commissioning and plant engineering for clients in Energy, Mining and Infrastructure.