give answers to four decimal places.
thanks in advance
Part of a power system is illustrated in
the figure below. Three synchronous generators are connected in
parallel to the same 6.6 kV bus-bars (G1: 2 MVA, 0.08 pu; G2:
5 MVA, 0.12 pu, G3: 8 MVA, 0.16 pu). The feeder has reactance of
0.125 ΩΩ/km and is 20 km long. The remote end of the feeder is
connected to the primary of a 250 kVA, 6600/415 V/V
transformer, with reactance of 0.05 pu. Select the common power
base as 100 MVA.
a) Determine the generator
(xn') per unit reactance for the given common power
base
x1' = p.u.
x2' = p.u.
x3' = p.u.
Calculate the per-unit and absolute values of the fault level
and fault current if a three-phase short circuit takes place on the
6.6 kV bus-bars (point 1 in the figure
)
isc = p.u.
ssc = p.u.
Isc = kA
Ssc = MVA
b) Calculate the feeder and transformer
per unit reactance (using the base voltage and base power of 6.6 kV
and 100 MVA)
xc = p.u. (feeder)
xtr = p.u. (transformer)
Calculate the per-unit and absolute values of the fault level
and fault current if a three-phase short circuit takes place on the
secondary of the transformer (point 2 in the figure
)
isc = p.u.
ssc = p.u.
Isc = kA
Ssc = MVA
c) Using the text box below, discuss the
method of analysis that has to be used in the case of asymmetrical
faults. Which are the most important asymmetrical faults
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