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Q#1 Fault Analysis GATE EE 1991 MCQ +2 marks -0.66 marks

A 100 MVA generator with 10% reactance and a 200 MVA generator with 8% reactance (reactances on their own bases) are connected as shown in figure. The fault level on bus 1 is to be restricted to 1500 MVA. Calculate, on 100 MVA base.          

(i) The reactance of bus bar reactor X

(ii) Fault level of bus 2

(iii) MVA rating of circuit breaker C

(i)  X = 0.16 pu

(ii)  Fault Level = 2884.60 MVA

(iii) MVA rating = 750 MVA

(i)  X = 0.26 pu

(ii)  Fault Level = 2884.60 MVA

(iii) MVA rating = 1500 MVA

(i)  X = 0.16 pu

(ii)  Fault Level = 2884.60 MVA

(iii) MVA rating = 1500 MVA

(i)  X = 0.16 pu

(ii)  Fault Level = 3884.60 MVA

(iii) MVA rating = 1500 MVA

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