A short shunt compound generator supplies a load of 10 kW at 200 V through a pair of feeder and series field resistance 0.10 ohm. Armature resistance, shunt field resistance and series field resistance are 0.01 ohm, 52.2 ohms and 0.10 ohm, respectively. If the core friction and windage losses amount to 631 watts, the BHP of the driving engine is nearest to

A short shunt compound generator supplies a load of 10 kW at 200 V through a pair of feeder and series field resistance 0.10 ohm. Armature resistance, shunt field resistance and series field resistance are 0.01 ohm, 52.2 ohms and 0.10 ohm, respectively. If the core friction and windage losses amount to 631 watts, the BHP of the driving engine is nearest to

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 2.21P: An industrial plant consisting primarily of induction motor loads absorbs 500 kW at 0.6 power factor...

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4. A short shunt compound generator supplies a load of 10 kW at 200 V through a pair of feeder resistance of 0.10 ohm. Armature, shunt field resistance and series field resistance are 0.10 ohm, 52.5 ohms and 0.10 ohm, respectively. If the core, friction, and windage losses amount to 631 watts, determine (a) HP of driving engine (b) commercial, electrical and mechanical efficiencies.
10. A short shunt compound dc generator supplies 7.5 kW at 230 V. the shunt field, series field and armature resistance are 100, 0.3 and 0.4 ohms respectively. Calculate the induced emf.
Q23) A shunt generator supplies a 20KW load at 200V through cables of resistance, R = 100mΩ. If the field winding resistance ,Rf=50Ω and the armature resistance, Ra=40mΩ, i) Estimate terminal voltage across the load. ii) Calculate the emf generated in the armature.
A short-shunt compound generator delivers a load current of 30 A at220 V and has armature, series-field and shunt-field resistances of 0.04Ω, 0.20 Ω and 100 Ω respectively. Calculate the generated emf and thearmature current. Allow 1.0 V per brush contact drop.
. A 480-V 200-kVA 0.8-power-factor-lagging 60-Hz two-pole Y-connected synchronous generator has asynchronous reactance of 0.25 Ω and an armature resistance of 0.03 Ω. At 60 Hz, its friction and windagelosses are 6 kW, and its core losses are 4 kW. The field circuit has a dc voltage of 200 V, and themaximum IF is 10 A. The resistance of the field circuit is adjustable over the range from 20 to 200 Ω.The OCC of this generator is shown in Figure P5-1.(a) How much field current is required to make VT equal to 480 V when the generator is running at noload?(b) What is the internal generated voltage of this machine at rated conditions?(c) How much field current is required to make VT equal to 480 V when the generator is running at ratedconditions?(d) How much power and torque must the generator’s prime mover be capable of supplying?
A lap wound dc generator having 50slots with 15conductors per slot generated at no led emf of 400v when running at 1000 rpm suppose if the same generator is desired to genate 220v on open circuit. Suggest the speed at which it has to be rotated
A long shunt compound generator delivers 100 A at 250 V. The armature, shunt field and series field resistances are 0.02 Ohms, 50 Ohms and 0.05 Ohms respectively. If the Break Horse Power (BHP) or the power developed by the shaft torque of the driving engine is 40, determine the stray loss.
A 4 pole lap wound shunt generator delivers 200A at a terminal voltage of 220V. Ra and Rsh are 0.02Ω and 55Ω respectively. Neglecting brush drop, determine (i) armature current (ii) current per parallel path, (iii) generated voltage and (iv) Power developed.
Show that an alternator running in parallel on constant-voltage and frequency bus-bars has a natural time period of oscillation. Deduce a formula for the time of one complete oscillation and calculate its value for a 5000-kVA, 3-phase, 10,000-V machine running at 1500 r.p.m. on constant 50-Hz bus-bars. The moment of inertia of the whole moving system is 14,112 kg-m2 and the steady short-circuit is five times the normal full-load value. ANSWER IS [1.33 second]
The synchronous reactance of the direct-axis and quadrature-axis of a three-phase,40-pole, 50 Hz, 13,8 kV, salient-pole synchronous generator is 2,38 Ω and 1,33 Ωrespectively. The resistance of the star-connected stator is negligible. The load angle ofthe machine is 30°e and the excitation is set to induce an emf of 167%. Sketch the phasordiagram and calculate:(a) current(b) power(c) reluctance torque(d) the maximum load angle(e) the maximum power developed
A 25kW, 250V DC shunt generator has armature and field resistances of 0.06 ohm and 100 ohm respectively. Determine the total armature power developed when working (i) as a generator delivering 25kW output and (ii) as a motor taking 25kW.
Problem: A short-shunt compound generator has armature, shunt field and series field resistances of 0.5 Ω, 156 Ω, and 0.465 Ω respectively. If it supplies a load of 9 kW at a terminal voltage of 241 V, calculate the generated emf in volt. *Four decimal places