Consider the power transmission from Power Station C to Substation / City SS as shown above,
all are per unit impedance, 3 phases fault was found at 11kV side of Substation “SS”. Selecting
the rating of transmission line 100MVA as base, evaluate:

a) Fault level at each stage
b) What is the breaking capacity of 11kV incomer for output to City SS
c) Brief us what is the functions of a Substation
d) Suggest an appropriate bus arrangement for Power Station C and Substation “SS”, justify your proposal.
e) Suggest a protective device in substation and its operation principle. Brief us the concerns in selectio

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