04 15 AV Problem 1: A power system network is given in Figure 1 and a fault occurs at bus 2 through a faul impedance of Z-0.02j p.u. The pre-fault bus voltages are 1 p.u. for all four buses. Find: a) Fault current (bus 2); b) Source branch current (bus 1); c) Fault bus voltages (bus 1, 2, 3 and 4) d) Fault line current (between bus I and bus 3). a I₂ (F) = √(o) Z22+Zp 13: Vi(F)-V(F) Z13 V₁(F)=VIC) +A V₁ (F) V₂(E) 021-5j IG₁ =I, (F).. IG₂= Ys 0.2 m 20 52 (A) = = -0.23 ⑥I, (F) = -7234-023 -0.013) 6.- L(F)-0--2" ww 0.5-2j 0.1j 3.5 0.3j 0.25-5 w Figure 1 J (1) V₁ (F)=V) +AV 1- VE(F)=0.59 VA(E)=67 V2 (6) Vaco) +AV= 0.94 AV=0.6 X AV-0-41X-5 AV4 0.33 X C Z (2+1)11 (52) ·3-= LVI (F)-V3(F) 13= -0.25