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categoryهندسة كهربائية
schoolبكالوريوس
event_available2026-07-13
السؤال
Transcribed Image Text:
A 300-MVA 20-kV three-phase generator has a subtransient reactance of 20%.
The generator supplies a number of synchronous motors over a 64-km
transmission line having transformers at both ends, as shown on the one-line
diagram. The motors, all rated 13.2 kV, are represented by just two equivalent
motors. The neutral of one motor M₁ is grounded through reactance. The neutral
of the second motor M2 is not connected to ground (an unusual condition). Rated
inputs to the motors are 200 MVA and 100 MVA for M, and M2, respectively. For
both motors X" = 20%. The three-phase transformer T₁ is rated 350 MVA, 230/20
kV with leakage reactance of 10%. Transformer T2 is composed of three single-
phase transformers, each rated 127/13.2 kV, 100 MVA with leakage reactance of
10%. Series reactance of the transmission line is 0.5 2/km. Draw the reactance
diagram with all reactances marked in per unit. Select the generator rating as
base in the generator circuit.
(13.8 kV)
M₁
(20 kV)
T₁
(230 kV)
T₂
Your
ma
Y
3870
M2
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