Parallel Operation of Alternator. Two 3-phase 6.6 kV, star-connected alternators supply a load of 3000 kw at 0.8 pf lagging. The synchronous impedance per phase of machine A is 0.5+j10 ohms and of machine B is 0.4+j12 ohms. The excitation of machine A is adjusted so that it delivers 150A at a lagging pf and the governors are set so that the load is shared equally between the machines. Find the line to line voltage of alternator B.

Parallel Operation of Alternator. Two 3-phase 6.6 kV, star-connected alternators supply a load of 3000 kw at 0.8 pf lagging. The synchronous impedance per phase of machine A is 0.5+j10 ohms and of machine B is 0.4+j12 ohms. The excitation of machine A is adjusted so that it delivers 150A at a lagging pf and the governors are set so that the load is shared equally between the machines. Find the line to line voltage of alternator B.

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

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.16P: A single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and...

See similar textbooks

Similar questions

The winding data for three different alternators are as follows I. 60 slots, four poles, span 1 to 9 II. 120 slots, six poles, span 1 to 16 III. 144 slots, eight poles, span 1 to 11 The windings having a pitch factor less than 0.9 are a. II and III only b. I and II only c. I, II and III. d. I and III only
The winding data for three different alternators are as follows 1. 60 slots, four poles, span 1 to 9 II. 120 slots, six poles, span 1 to 16 II. 144 slots, eight poles, span 1 to 11 The windings having a pitch factor less than 0.9 are a. I and II only b. I, Il and III. c. I and II only d. Il and III only
Two identical three-phase Alternators A and B share equally a load of 10 MVA at 33 KV and 80% lagging power factor. The synchronous reactance of each generator is 4 ohms per phase and the armature resistance is negligible. Alternator A has its field excitation adjusted to carry a25 amperes at lagging power factor. What is the current delivered by Alternator B ?
An alternator is at lagging power factor when it is normally excited O True O False
The regulation of an alternator is likely to be negative in case of resistive load O True O False
A three phase star connected alternator has a resistance of 0.5 ohms per phase and a synchronous reactance of 5 ohms per phase. It is exited to give 6600 V (line) on open circuit. Determine the terminal voltage and voltage regulation on full load current of 130 A when the load pf is (i) 0.8 lagging (ii) 0.6 leading pf
A 3-phase alternator generates an open circuit voltage of 4000 V per phase when exiting current is 50 A, the short circuit current for the same excitation being 800 A. The synchronous reactance per phase is?
Two identical three – phase Y – connected alternator A and B share equally a load of 10MW at 33kV and 80% lagging pf. The synchronous reactance of each machine is 4 ohms per phase and thew armature resistance is negligible. Alternator A has its filed excitation adjusted to carry 125 A lagging current, what is the current supplied by alternator B? a. 96 A b. 97 A b. 98 A d. 95 A
The winding data for three different alternators are as follows I. 60 slots, four poles, span 1 to 9 ed dout of II. 120 slots, six poles, span 1 to 16 III. 144 slots, eight poles, span 1 to 11 The windings having a pitch factor less than 0.9 are O a. Il and III only O b. I and Il only O .I, Il and II. Od.l and III only
Two identical, 3-phase, Y-connected alternators A and B share equally a load of 10MW at 33kV at 0.8pf lagging. The synchronous reactance of each machine is 4 ohms per phase and the armature resistance is negligible. Alternator A has its field excitation adjusted to carry 125A lagging current. What is the current supplied by alternator B?
Two three-phase alternators operate in parallel and the excitation is such that theinduced emfs are 1 kV/ph. The load admittance is (0,427 – j0,214) S. Theadmittance/phase of the machines are (0,0262 – j0,499) S and (0,0218 – j0,312) Srespectively. The emf of B leads A by 10°e. Calculate:(a) the terminal voltage(b) the current supplied by A(c) the power factor of B
The reactive power output of an alternator is limited by load angle True False