Question

QUESTION 5. (a) Think of any power engineering software of your choice and explain how you can you use it in your master's research work. (b) Explain the effect of neutral point impedance on zero sequence networks. (e) Consider the network shown in Fig. 25. The system parameters are given below: Generator G: 50 MVA, 20 kV, X"=X; = X3 = 20%, Xo = 7.5% Motor M: 40 MVA, 20 kV, X"=X7-X; -20%, Xo = 10%, X. -5% Transfomer Ti: 50 MVA, 20 kVA110 kVY, X = 10% Transfomer T2: 50 MVA, 20 kVA110 kVY, X = 10% Transmission line: Xi = X3 = 24.2 22, Xo = 60.5 12. oli Fig. 25 By choosing 50 MVA as the base, determine the Yous of the system. 15+5+10) Marks

Answer 1

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(6) Effect of neutral impedence on Zero sequence network: The impedence offered by the system to the flow of Zero sequence current is known as Zoro sequence impedence This is because the three Zero sequence current at any point in a Electrical power system, being in phone, Zoo but most return, through the neutral and Earthi do not Sum to Jao Ibo + Leo. the neutral let assume a system in which with impedence to then is grounded IRO XGO In VE s Iyo Here In = 3 IRO Coll By writting KvL VRI = 3TR0 kn + TR;XG70 VRI - IRO ( 3x n+xGo) | VR1 = IRO xo Xo - Xo+ 3xp

A (c) Given data Generator : 50MVA, 20kv,x" = x15x2 = 206,180 = 7.5-4. motor : 40mVA, 20 kV, "=29= x2= 20). Xo = 107, X0=5.1. Transformer T: 50mva, 20kV/10kw(21)=107. Transfov mel T2 : 50MVA, 20Kv/ no kv, x= 10 x ton Transmission line : x1=x2 = 24.2.1 Xo- 60:512, 3 4 G 6 ho tory 2 ti on let us consider Base MVA = 50 50 MVA Base kv 20 kv. m let us consider & Calculate all Equipmut pu impedant new base, ratings, on (striewe vera Base voltage of the transmission line is then determined by fromsformer, the turns ratio of the connecting 20 X 110 20 = 110 kV 20 .: XPU OG TL= x2 * Sb (Vb) 2 24.2 x 50x106 (llOx103)? 0:1pU.

for motor, (xpu) new kpu) old Х (MVA) new (MVAold 50 0-25p. = 0.2 X 40 single line diagram of the abover netwoth is, tom jon tim tom joil jo 2 0 © joy jo 25 G the impedence into admittances, By convorting lot now 6-15 -j10 3 -34 -315 jto 0 j 10-320 Bus = jio 0 jlo -320 110 0 jio --j14