A 6.6 kV, 3-phase, star-connected turbo-alternator of synchronous reactance 0.5 ohm/phase is ap- plying 40 MVA at 0.8 lagging p.f. to a large system. If the steam supply is suddenly cut off, explain what takes place and determine the current the machine will then carry. Neglect losses. 12100 A] (Elect. Machines (E-3) AMIE Sec. B Summer 1990)

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4. A 6.6 kV, 3-phase, star-connected turbo-alternator of synchronous reactance 0.5 ohm/phase is ap-
plying 40 MVA at 0.8 lagging p.f. to a large system. If the steam supply is suddenly cut off, explain
what takes place and determine the current the machine will then cary. Neglect losses.
12100 A] (Elect. Machines (E-3) AMIE Sec. B Summer 1990)
5. A3-phase 400 kVA, 6.6 kV, 1500 rpm., 50 Hz alternator is running in parallel with infinite bus bars.
Its synchronous reactance is 25%. Calculate (f) for no load (i) full load 0.8 p.f. lagging the synchro-
nizing power and torque per unit mechanical angle of displacement.
[Rajive Gandhi Technical University, 2000) () 55.82 kW, 355 Nw-m () 64.2 kW, 409 Nw-m]
Transcribed Image Text:4. A 6.6 kV, 3-phase, star-connected turbo-alternator of synchronous reactance 0.5 ohm/phase is ap- plying 40 MVA at 0.8 lagging p.f. to a large system. If the steam supply is suddenly cut off, explain what takes place and determine the current the machine will then cary. Neglect losses. 12100 A] (Elect. Machines (E-3) AMIE Sec. B Summer 1990) 5. A3-phase 400 kVA, 6.6 kV, 1500 rpm., 50 Hz alternator is running in parallel with infinite bus bars. Its synchronous reactance is 25%. Calculate (f) for no load (i) full load 0.8 p.f. lagging the synchro- nizing power and torque per unit mechanical angle of displacement. [Rajive Gandhi Technical University, 2000) () 55.82 kW, 355 Nw-m () 64.2 kW, 409 Nw-m]
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