A 50-MVA. 30-KV. three-phase synchronous generator has a synchronous reactance of 9 Ohms/phase and negligible armature resistance. The generator is operating with an excitation per phase E= 23.558 KV. and is delivering maximum power before losing synchronism (stability limit). Thus, the maximum generated power is Pmax = and the armature current is la = 238 51.8 (KA) 2.446 51.85 (KA) None of these 3.248 36.32 (KA)

A 50-MVA. 30-KV. three-phase synchronous generator has a synchronous reactance of 9 Ohms/phase and negligible armature resistance. The generator is operating with an excitation per phase E= 23.558 KV. and is delivering maximum power before losing synchronism (stability limit). Thus, the maximum generated power is Pmax = and the armature current is la = 238 51.8 (KA) 2.446 51.85 (KA) None of these 3.248 36.32 (KA)

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

See similar textbooks

Similar questions

Two 30 AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductors per slot in big generator in K times that of the smaller one. The value of K to get equal no-load voltage at same frequency is (a)8 (b) 8 1 (d) 7 (c) 4
A synchronous generator runs at 250 rpm and generates at 50-Hz. There are 216 slots, each containing 5 conductors arranged in a full-pitched winding for 3-phase star connection. All the conductors of each phase are in series and the flux per pole at no-load sinusoidally distributed over the pole pitch is 30 mWb. Find the emf induced in each phase winding and the terminal voltage.
synchronous generator threewThe phases are rated at 1000 kVA and operate at a voltage of 6.6 kV. The product resistance per phase is 0.38 ohms and the leakage reactance is 0.5 ohms per phase. The generator works to provide full load at a power factor of 0.85 delayed and at normal voltages. Find the value of the no-load voltage.
(use 2-decimal digits for solutions) A synchronous generator runs at 250 rpm and generates at 50-Hz. There are 216slots, each containing 5 conductors arranged in a full-pitched winding for 3-phasestar connection. All the conductors of each phase are in series and the flux perpole at no-load sinusoidally distributed over the pole pitch is 30 mWb. Find the emfinduced in each phase winding and the terminal voltage.
2.2 A three-phase synchronous generator has a reactance of 1.5 p.. and negligible resistance. It supplies a rated current of 1.0 p.. at 1.0 p.u. terminal voltage to a lagging load of 0.9 power factor. Determine the rated excitation voltage in p.u. and the internal load angle. Construct the performance chart of the generator in 2.1 (above) assuming its rating is 450 MVA.
A short shunt compound generator has an armature,shunt field and series field resistances of0.02 ohm, 80 ohm and 0.03 ohm respectively. The generator’s induced emf is 510V when theterminal voltage is 500V. How much load current is delivered under this condition.
A 1MVA, 11 KV, three phase wye-connected synchronous generator has a synchronous reactance of 5 ohms and a negligible reactance per phase. At a certain field current the generator delivers rated load at 0.9 lagging power factor at 11 KV. For the same excitation, what is the terminal voltage at 0.9 leading power factor full-load?
The standard practice of synchronous generator construction now a days is to have Cylindrical field Rotating armature Either of the above Rotating field In an alternator, the armature reaction influences the magnitude of No load loss Wave form of generated voltage. Speed of the machine Flux Terminal voltage per phase
A synchronous generator runs at 250 rpm and generates at 50-Hz. There are 216slots, each containing 5 conductors arranged in a full-pitched winding for 3-phasestar connection. All the conductors of each phase are in series and the flux perpole at no-load sinusoidally distributed over the pole pitch is 30 mWb. Find the emfinduced in each phase winding and the terminal voltage.
A 60 MVA, 69.3 KV, three-phase synchronous generator has a synchronous reactance Xs = 15 ohm/phase. The generator is supplying its rated power (i.e. 60 MVA) to an infinite bus at 0.8 power factor lagging. Determine: a) The armature current Ia. b) The generator emf per phase (E). c) The power angle. d) The maximum power (P) that the generator can supply. Xs = j 150 la Vline = 69.3 KV
Which of the following is true in the phasor diagrams drawn according to the ohmic, inductive and capacitive operating states of the round pole synchronous generator a) Due to the voltage Efd, the excitation current is large in capacitive operation and small in ohmic operation b) Due to the voltage Efd, the excitation current is large in ohmic operation and small in inductive operation c) Due to the voltage Efd, the excitation current is small in capacitive operation and large in inductive operation. d) Due to the voltage Efd, the excitation current is large in capacitive operation and small in inductive operation.
A 50-MVA, 30-kV, three-phase synchronous generator has a synchronous reactance of 8 Ohms/phase and negligible armature resistance. The generator is delivering 50 MVA at 0.8 pf leading to an infinite bus at the rated voltage. Determine the excitation per phase E and the power angle &. Select one: O a. E = 22.78 KV and 8= 15.67 deg. O b. E = 14.115 KV and 8= 25.85 deg. O c. None of these O d. E = 13.96KV and 8= 29.74 deg. O e. E = 27.47KV and 8= 22.84 deg. Impedances are marked in perunit on a 100MVA, 100 KV base. The load at bus 2 is S2= 16MW - 132 MVAR, and the load at EN ? 1:4 4/1- TOSHIBA