Answer Posted / engr. md n h shabuj

S=(Ish *√t)/K
=(10.49*√1)/0.143
=73.35
=75Rm cable

Ish =P/ (√3*V* % of Z)
= (1500*10^3 )/( √3*11*10^3*7.5%)
=1049A
Ish =1049*10=10490A=10.49KA

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