PROBLEM – 01
A 10MVA 33kV 3-phase generator has a sub-transient reactance of
15%. The generator is connected to the motors through a transmission line and
transformers as shown in fig. The motors have rated of 30MVA and 50MVA at 30kV
with 20% sub-transient reactance. The 3-phase transformer are rated at 110MVA,
33 kV (delta) / 100 kV (star) with leakage reactance 8%. The line has a
reactance of 50 ohms. Selecting the generator rating as the base quantities in
the generator circuit determine the bus quantities in other parts of the system
and evaluate the corresponding p.u. values.
PROBLEM – 02
For the system shown in the
figure, draw the reactance diagram.
PROBLEM – 03
Two generators at 10MVA,
13.2kV, and15MVA, 13.2KV, respectively are connected in parallel to a bus. The
bus feeds two motors rated at 10MVA and 12MVA respectively. The rated voltage
of motors is 12.5kV. The reactance of each generator is 15% and that of each
motor is 20% on its, own rating. Assume 50MVA, 13.2kV and 15MVA, 13.2kV base
and draw the reactance diagram.
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