Power Generation and Distribution

1. EENG456 (Power Generation and Distribution) – Quiz TWO
Date: 10/05/2017 Duration: 60 Min. Instructor: Asst.Prof.Dr.Reza SIRJANI
Student No: …………………. Name and Surname: …SOLUTION………
Q1) A 3-phase, 50 Hz
, 3300 V
star connected induction motor develops 250 H.P. (186.5 kW
), the power factor being
0.707 lagging and the efficiency 0.86. Three capacitors in delta are connected across the supply terminals and
power factor raised to 0.9 lagging.
a) Calculate the kVAR rating of the capacitor bank. (15 P)
b) Calculate the capacitance of each unit. (20 P)
c) Sketch the power triangle to show reactive power reduction. (10 P)
Q2) The loads information is given in table. What is the equivalent system power factor? (25 P)
Q3) Three generators are operating together and supplying a real load of 12 MW
at 0.9 PF lagging. Find the system
frequency and power supplied by each generator. (30 P)
No-load Frequency
(Hz)
Slope of Power- Frequency curve
(MW/Hz)
Gen. 1 51.1 1
Gen. 2 52 0.8
Gen. 3 50.6 1.2