Question

Question 1 (10 Marks) A. Measurements of a three-phase motor are as follows: Voltage Current 415V 30.5A Power factor: 0.85 Calculate the yearly cost of running the motor, if the motor runs 10 hours per day, and elcetricty cost is 23.5 c/KWh. (Assumption: 1 year 365 days) (4 Marks) B Current load demand of a region in Mid-West of Western Australia is 3,700MW This region has four diesel power stations with maximum capacity of 1500 MW, 1200MW, 1000 MW and 800 MW. Additional 800 MW power supply is coming from the neighbouring region Calculate the spinning reserve for the region? Is the spinning reserve sufficient in case of failure of any one of the power station? What will be the scenarios if load demand of the region increases to 4,600MW? (Assumption: Ignore losses) (3+1+2 Marks)

Answer 1

41S V CVL 30-5 A S8.9 ? = J3 V, I, Cs J (1530-50-35) kwN aingAas рoт d t of 1 unit ot emeigy Toral Cat x35 (I8-634) 10)23-s)(35) 15 983 63.22 c

(b) ISOOMW GENERATOR t200 MWJ GEN G EN GEN MWPOS SooM W GEN Deman d 370o MW To tal nenrain : S300MW / Mornimun Resewe Toal Gemetahion- Demamd Spinniy = S300 1600 M W Even when GEN 1 ails 100 /oo MW exlers So this Conditian i^ Coun be Load demamd 'MWOoS fallk fo (530o -4c00 )MW .e 700MW inlreases to Teschwe ndrator fdh topera, ptaton bclores les ham demamd amd dessaste