Question

A 100 MVA, 18 kV generator, with per unit reactance of X”d = 0.19, X’d = 0.26, and Xd = 1.3 is connected through a circuit breaker to a transformer rated 100 MVA, 240Y/18 kV, X = 0.10 per unit. It is operating at no load and rated voltage when a three-phase short circuit occurs at the high voltage side of the transformer. Find the initial symmetrical rms current in the line on the low voltage side.

Name: a 100 mva 18 kv generator with per unit reactance of xd 019 xd 026 and xd 13 is connected through a circuit breaker to a transformer rated 100 mva 240y18 kv x 010 per unit it is operating at no load a
Uploaded: 2021-11-10T11:54:20-08:00
Duration: 1 min 45 s
Channel: Prem Bijarniya
Description: a 100 mva 18 kv generator with per unit reactance of xd 019 xd 026 and xd 13 is connected through a circuit breaker to a transformer rated 100 mva 240y18 kv x 010 per unit it is operating at no load a

          A 100 MVA, 18 kV generator, with per unit reactance of X”d
= 0.19, X’d = 0.26, and Xd = 1.3 is connected through a
circuit breaker to a transformer rated 100 MVA, 240Y/18 kV,
X = 0.10 per unit. It is operating at no load and rated
voltage when a three-phase short circuit occurs at the high
voltage side of the transformer. Find the initial
symmetrical rms current in the line on the low voltage
side.

Added by Dennis B.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Prem Bijarniya

11/10/2021

Step 1

The per unit impedance of the generator is given by: Zg = Xd * (Sg / Vg^2) where Zg is the per unit impedance of the generator, Xd is the per unit reactance of the generator, Sg is the apparent power of the generator (100 MVA), and Vg is the rated voltage of the Show more…

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A 100 MVA, 18 kV generator, with per unit reactance of X”d = 0.19, X’d = 0.26, and Xd = 1.3 is connected through a circuit breaker to a transformer rated 100 MVA, 240Y/18 kV, X = 0.10 per unit. It is operating at no load and rated voltage when a three-phase short circuit occurs at the high voltage side of the transformer. Find the initial symmetrical rms current in the line on the low voltage side.