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power Systeme

exercice:

A symmétrical 3 phase schort circuit occur's on the 11.8kv bus bar of the circuit.

G1 : 20MVA    ; XG1=0.07 p.u

G2 : 60MVA    ; XG2=0.1 p.u

G3 : 20MVA    ; XG3=0.08 p.u

the voltage at the new bus bar drops to 5kv compared to the nominal voltage.

Qst:

1- find and calculate the expression of fault current and the fault apparent power.

2- calculate the quantity of Var to be injected at the level of the busbar, to restore the original value of the voltage.

Sbase=60MVA ; Ubase=11.8kv

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please give me the answer

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