Short-circuit Armature Current Per Phase Engineering Assignment Help
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Malaysia
Assignment Task
Q1
A 3-? generator, 1-pole pair, Star-connected, 12.2kV, 25000 kVA, was tested for 50Hz grid connection purpose. The per phase winding resistance of the generator is 0.6 ?/? and it is expected to feed a rated load of 0.9 pf lagging. Two tests were conducted, and the recorded data are tabulated
Determine the following:
a) The per-phase unsaturated synchronous reactance, XS.
b) An approximate saturated synchronous reactance, XS(Sat) at a If = 380 A.
c) An approximate saturated synchronous reactance, XS(Sat) at If = 475.
d) The short-circuit ratio for this generator.
e) The internal generated voltage, EA at rated conditions.
f) The required If to achieve rated voltage at rated load.
Q- 5A 100 A of short-circuit armature current per phase, IA(SC) at a field current of 2.5 A (IF=2.5A) has been recorded on a Y-connected synchronous generator during short-circuit test. While the open-circuit line voltage is measured to be 0.44 kV for a given field current of 2.5 A (IF=2.5A). Under these conditions, determine the following:
a) Saturated synchronous reactance, XS(Sat).
b) Voltage regulation, V.R (%), if the per phase armature resistance 0.3 ?/?, and the generator supplies 60 A (IA = 60A) to a purely resistive Y-connected load of 3 ?/?.
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