Consider an electrical system shown in figure below. A 3-phase short circuit occurs as shown in figure. If the shunt impedance at the short-circuit point is Zs*) 0.15 Determine the maximum time when a short circuit can still be cleared. (All the system parameters in per-unit values). CB1 v-1.0 1O CB2 XLI T2 TI CB3 CB4 XL2 XL3 S 0.8+j0.3 T3 XL4 SL-0.1+j0.1

0.2 Consider an electrical system shown in figure below. A 3-phase short circuit occurs as shown in figure. If the shunt impedance at the short-circuit point is Zs= j 0.15. Determine the maximum time when a short circuit can still be cleared. (All the system parameters in per-unit values ). Caps L V=1.0 [0 T2 CB1 CB2 XL1 TI Chit G CB3 CB4 XL2 XL3 S-0.8+j0.3 T3 Zs XL4 SL=0.1+j0.1 Xd = 0.1 ; XT1 = XT2 =XT3= 0.15 ; XL1 = 0.4 ; XL2=XL3 = 0.2 ;XL4-0.1; M =8S;