A 430 V, 3-phase star connected alternator supplies a delta-connected load, each phase of which has a resistance (R) of 45 Ohms and inductive reactance (XL) 52 Ohms. Calculate (a) the current supplied by the alternator (b) Power Factor of the load and (c) the output power of the alternator. Phase Current Power Factor of the Load Output Power

A 430 V, 3-phase star connected alternator supplies a delta-connected load, each phase of which has a resistance (R) of 45 Ohms and inductive reactance (XL) 52 Ohms. Calculate (a) the current supplied by the alternator (b) Power Factor of the load and (c) the output power of the alternator. Phase Current Power Factor of the Load Output Power

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.43P: Three single-phase transformers, each rated 10MVA,66.4/12.5kV,60Hz, with an equivalent series...

See similar textbooks

Similar questions

Does an open connection permit balanced three-phase operation? - (a) Yes (b) No
A 6,600V, 1,200 kVA, 3-phase alternator is delivering full load at 0.80 power factor lagging. Its reactance is 25% and resistance is negligible. By changing its excitation, the emf is increased by 30%. At this load, determine the new current and power factor. Draw the single line diagram.
Two 15-kVA, 400-V, 3-ph alternators in parallel supply a total load of 25 kVA at 0.8p.f. lagging. If one alternator shares half the power at unity p.f., determine thep.f. and kVA shared by the other alternator.
n 3-phase alternator, the change of terminal voltage from no load to full load is more in case of leading power factor as compared to unity power factor. Select one: True False
A 10 MVA, 11 KV, 3-phase star-connected alternator is protected by the Merz-Price balance-current system, which operates when the out-of-balance current exceeds 20% of full-load current. Determine what portion of the alternating winding is unprotected if the star point is earthed through a resistance of 9Ω. The reactance of the alternator is 2Ω.
A three-phase, wye connected alternator is rated at 720 kVA, 2400 V, 60 Hz. At the rated load, determine: the output, in kilowatts, at 80% lagging power factor. the full-load line current. the full-load current rating of each of the three windings. the voltage across each winding
A 15kVA, 440V, single-phase alternator draws a field current of 5A at rated load. With the same field current, the open circuit emf and short-circuit current are 100V and 80A respectively. The ohmic resistance of the armature between terminals is 0.12 ohm. The ratio of effective to ohmic resistance maybe taken as 1.1. Determine the voltage regulation (in %) when the load is purely resistive.
A three-phase Y-connected alternator delivers a unity power-factor load at 220 volts. If the synchronous-reactance voltage drop is 50 volts per phase, neglecting the resistance voltage drop. First Trinal Exan 2. A 3-phase I load at 200 a. calculate the generated voltage b. calculate the percent regulation
Two 3Ø alternators are supposedly operating in parallel and supplying a total load of11kV, 1500kW at a pf of 0.866 lagging. Initially, one alternator supplies ¼ of the totalpower at 60Hz. The other alternator supplies ¾ of the total power at 59.9Hz. Thesynchronous reactance of each is 50/Ø and the effective AC resistance at 25⁰C is 4/Ø.Without changing any given data, determine the generated voltage of the 2nd alternator
A 3-phase, delta-connected alternator supplies a wye connected load, each phase of which has a resistance of 15 ohm and inductive reactance 20 ohm. If the line voltage is 400 V. calculate (a) the current supplied by the alternator and (b) the output power and kVA rating of the alternator, neglecting any losses in the line between the alternator and the load.
A 3-phase, 15 MVA, 10 kV alternator has internal reactance of 6% and negligible resistance. Find the external reactance per phase to be connected in series with the alternator so that the steady current on 3-phase short circuit does not exceed 6 times the full load current.
Given:1. 10 Pole, wye-connected three-phase alternator2. 240 slots 3. 4 turns per coil (lap coils)4. 16/24 pitch5. 8460000 maxwell flux per pole6. 1670 rpm, alternator driven speed Determine the total line - to - line generated voltage. Please show the detailed formula and solution.