A part of a 50 Hz power transmission and distribution system is represented by Figure Q3a. The system operates with a power factor close to 1.0. i) ii) iii) 245 kV CB1 xh Fault Location A: IFA = 60 KA 2.65Ω 200 MVA X = 10% CB2 Figure Q3a 0.2 Ω 33 kV Estimate the fault current at location B. Fault Location B The rated MVA of the transformer is taken as the base MVA for the per unit system. Define and calculate the base voltage, base impedance and base current on both sides of the transformer. Calculate, with details, the per unit value of the total impedance from the 245 kV generator to Location B in Figure Q3a.

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A part of a 50 Hz power transmission and distribution system is represented by
Figure Q3a. The system operates with a power factor close to 1.0.
i)
ii)
iii)
iv)
245 kV
CB1
0x4
Fault
Location A:
IFA = 60 KA
2.652
200 MVA
X = 10%
CB2
Figure Q3a
0.2 Ω
33 kV
Estimate the fault current at location B.
Fault
Location B
The rated MVA of the transformer is taken as the base MVA for the per
unit system. Define and calculate the base voltage, base impedance and
base current on both sides of the transformer.
Calculate, with details, the per unit value of the total impedance from the
245 kV generator to Location B in Figure Q3a.
Determine the ratings of the two circuit breakers (rated voltage, rated load
current, frequency and rated short circuit current).
Transcribed Image Text:A part of a 50 Hz power transmission and distribution system is represented by Figure Q3a. The system operates with a power factor close to 1.0. i) ii) iii) iv) 245 kV CB1 0x4 Fault Location A: IFA = 60 KA 2.652 200 MVA X = 10% CB2 Figure Q3a 0.2 Ω 33 kV Estimate the fault current at location B. Fault Location B The rated MVA of the transformer is taken as the base MVA for the per unit system. Define and calculate the base voltage, base impedance and base current on both sides of the transformer. Calculate, with details, the per unit value of the total impedance from the 245 kV generator to Location B in Figure Q3a. Determine the ratings of the two circuit breakers (rated voltage, rated load current, frequency and rated short circuit current).
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