B The Single Line Diagram And The Data For Each Device Of Three Phase Power System Are Shown In Figure Q2 B Select T 1 (87.98 KiB) Viewed 32 times
(b) The single-line diagram and the data for each device of three-phase power system are shown in Figure Q2(b). Select the common base on generator side as 100 MVA and 22 kV. The three-phase load at bus 4 absorbs 50 MVA, 0.8 power factor lagging at 10 kV. Line 1 and line 2 have reactance of 25 12 and 35 12, respectively. (1) By choosing generator rated voltage at bus 1 as the base voltage, determine the base voltage for all sections of the network. (4 marks) Determine the per-unit reactance for generator and transformers on a same 100 MVA base voltage. (5 marks) (iii) Determine the per-unit reactance for motor with rated 65 MVA and 15 kV. (1 mark)
(iv) Determine base impedance and per-unit reactance for line 1 and line 2. (4 marks) (v) Determine base impedance and per-unit reactance for the load. (4 marks)
50MVA 22/220kV X=10% Tl 2 50MVA 220/11kV X=5% T2 3 Line 1 220kV 65MVA 15kV X=15.5 G 1 M T3 14 6 100MVA 22kV X=15% Line 2 110kV Load 45MVA 10kV pf=0.5 lagging 50MVA 22/110kV X=5% 50MVA 110/11kV X=10% Figure Q2(b)
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