A 50MVA, 11kV salient pole machine having a direct‐axis reactance of 0.8pu and a quadrature‐axis reactance of 0.6pu. The machine is connected to an infinite bus having a voltage of 11kV and supplying 40MW at 0.8 lagging power factor. Determine the power angle, the voltage proportional to field current, the direct axis and the quadrature‐axis components of the voltage and current. The load angle and the excitation voltage at which the maximum power transfer occurs.

A 50MVA, 11kV salient pole machine having a direct‐axis reactance of 0.8pu and a quadrature‐axis reactance of 0.6pu. The machine is connected to an infinite bus having a voltage of 11kV and supplying 40MW at 0.8 lagging power factor. Determine the power angle, the voltage proportional to field current, the direct axis and the quadrature‐axis components of the voltage and current. The load angle and the excitation voltage at which the maximum power transfer occurs.

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

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.4P

See similar textbooks

Related questions

Q: The armature reaction of DC machines is less under no load condition. Select one: O True O False

A: Armature reaction is the effect of armature fluxon the main field flux. Armature flux is due to…

Q: A d.c. shunt machine generates 250-V on open circuit at 1000 r.p.m. Effective armature resistance is…

Q: For a coil, each turn faces (2t4 – t³ – 2t) milliwebers of flux. The value of induced EMF in coil…

A: Given: A coil flux, φ=2t4-t3-2t mWb Total number of turns, N = 100 Time, t =2 sec

Q: 7- An 8-pole d.c. machine of 1200kW, 600V, 500 rpm and the average value of the reactance voltage…

Q: The armature and field resistances of a series machine are 0.2 ohm and 0.3 ohms respectively. While…

A: Machine is series wound machine Armature resistance Ra = 0.2Ω Field resistance Rf = 0.3Ω No load…

Q: DC machine with 2 poles, wave winded (retrogressive) (two layers) with 18 slots, the values of pole…

Q: The p.u parameters for a 500 MVA machine on its own base are: inertia,M=20 p.u.;Reactance X=2 p.u.…

A: Given: MVAB-Old=500 MVAMVAB-New=100 MVAInertia constant (M)=20 p.uReactance (X)=2 p.u

Q: 1-Which of the following statements INCORRECTLY explain the label in the figure about LVDT working…

A: 1) Lvdt is an pssive transducers which is usdd for linear displacement measurement. It consists of…

Q: h a labelled diagram of any DC machine Discuss it part

A: A self-excited DC shunt motor, also known as a shunt wound DC motor, is a form of self-excited DC…

Q: machine, running at 500 rpm the hysteresis and eddy current losses are 350 watts and 100 watts…

A: Introduction: Eddy current losses: According to Faraday's law of electromagnetic induction, when an…

Q: 1. A 100-V shunt motor is developing 6 bg while operating at an overall efficiency of 86%. The…

A: as per our guidelines we are supposed to answer only one question so i am solving first question .…

Q: In a D.C machine, running at 450 rpm the hysteresis and eddy current losses are 300W and 150W…

Q: A thicker wire is used in the DC series field winding than DC shunt field winding in DC machines. *…

A: current carrying capacity of wire is directly proportional to area of wire. i.e. thicker the wire ,…

Q: h) Explain the methods of voltage control used in AC-AC converters.

A: There are two methods are used in voltage control of AC-AC converters. Phase control On-off…

Q: Q3/ A/ Compare between de series and shunt generator. Q3/ B/ Briefly explain the commutating process…

Q: Two shunt generations each having an armature resistance of 0.05 ohm and field resistance 40 ohms…

A: It is given that: Ra1=Ra2=0.05 ΩRsh1=Rsh2=40 ΩEg1=250 VEg2=260 VIL=2000 A

Q: The introduction of interpoles in between the main pole improves the performance of dc machines,…

A: Given that The introduction of interpoles in between the main pole improves the performance of dc…

Q: The following figure shows a simplified endivi and inductor for a dc motor. The inductor has an…

A: “Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: A synchronous generator with a synchronous reactance of 1.15 p.u. is connected to an infinite bus…

A: Given data, Xs=1.15 puV=1.0 VXe=0.15 puPmax.=1.2 pu

Q: Q9 / What are the function of brushes , pole and commutator in DC machine

Q: ) A dc shunt machine while running as generator develops a voltage of 240 V at 1000 rpm. on no-los…

A: In this question we will find speed and efficiency of dc motor....

Q: A DC, separately excited motor is used to drive a constant-torque load. The field circuit is excited…

A: DC Motor: DC Motor is an electromechanical device which converts electrical energy to mechanical…

Q: loaded condition, the efe action is more in DC mach lect one: O True O False

A: Effect of armature flux on main flux is known as armature reaction.

Q: A DC, separately excited motor is used to drive a constant-torque load. The field circuit is excited…

Q: N k WN*+z = -WN"

A: The following property of the twiddle factor is to be verified: WNk+N2=WNk

Q: In DC machines, ....................... are made from laminated steel or low carbon steel and used…

A: In DC machines, Armature is made from laminated steel or low carbon steel and used to reduce the…

Q: An 8-pole d.c. machine of 1200kW, 600V, 500 rpm and the average value of the reactance voltage per…

Q: A 220 V , 60 Hz , supply is connected to 200 – turn armature winding of reluctance 1.7x105 At / Wb .…

A: Given:220 Voltf=60HzN=200 turnsReluctance S=1.7×105At/WbTo find:Magnetising reactance=?InductanceL=?

Q: A 8 pole, series connected DC machine is being used as a window winder in an automobile application.…

A: The given information about a 8 pole, series connected DC machine is being used as a window winder…

Q: Draw the equivalent circuit of a DC Motor, Separated Excited DC Motor and Compounded DC Motor. Label…

Q: The resistance of the field winding(copper wire) of a DC machine is 0.25 ohm at 25°C. When operating…

A: In this question we need to find a resistance of the field winding at full load.

Q: 15. For a dc machine, its commutator has a diameter of 50 c rotating at 1000 rpm. For a brush width…

Q: Write a MATLAB program describing the following figure. one cycle - TIME PRESSURE amplitude

A: The given signal is a sinusoidal signal with a general representation. The same graph can be drawn…

Q: A DC shunt machine while running as generator develops a voltage of 250 V at 1000 r.p.m. on no-load.…

Q: 3 For a coil, each turn faces (2t4 – t³ – 2t) milliwebers of flux. The value of induced EMF in coil…

A: Given a coil, Each turn faces a flux, φ=2t4-t3-2t mWb. Total number of turns, n = 100 turns. Time, t…

Concept explainers

Motor Load, Torque, and Power Quality Requirement

An electric motor is a gadget that changes electrical energy into mechanical energy over to follow up on a mechanical burden. The weight set on the motor because of this mechanical movement is known as motor load. Appropriately matching the motor burden to the engine is vital to forestall harm to the engine or wasteful and unnecessary expensive activity. Engines perform such undertakings as moving a thing starting with one spot then onto the next, cutting it, changing its shape, etc. The motors might be evaluated as far as a few variables including power yield, voltage, current, and temperature. Harm to an engine might happen when it is worked under over the top engine load contrasted with its appraised limit.

Question

A 50MVA, 11kV salient pole machine having a direct‐axis reactance of 0.8pu and a
quadrature‐axis reactance of 0.6pu. The machine is connected to an infinite bus having a voltage
of 11kV and supplying 40MW at 0.8 lagging power factor. Determine the power angle, the
voltage proportional to field current, the direct axis and the quadrature‐axis components of the
voltage and current. The load angle and the excitation voltage at which the maximum power
transfer occurs.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1: Given information.

VIEW

Step 2: Calculation of the per unit armature current and per unit terminal voltage.

VIEW

Step 3: Calculation of the power angle.

VIEW

Step 4: Calculation of voltage proportional to field current.

VIEW

Step 5: Calculation of the direct axis and the quadrature axis components of the voltage.

VIEW

Step 6: Calculation of the direct axis and the quadrature axis components of the current.

VIEW

Step 7: Calculation of the load angle at which the maximum power transfer occurs.

VIEW

Solution

VIEW

Step by step

Solved in 8 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.

Similar questions

dc machines
electrical engineering what is current transformers advantage?
Solve it quickly please
A DC, separately excited motor is used to drive a constant-torque load. The field circuit is excited by a full-wave, AC/DC SCR converter. The armature circuit of the motor is connected to a constant dc voltage source of 160 V. The inductance of the field circuit is large, and the field current is continuous. The field AC voltage (input to the converter) is 147 V (rms), and the field resistance is 100 N. The armature resistance is 1.2 N. When the triggering angle of the SCRS is adjusted to zero, the motor speed is 1000 rpm, and the armature current is 10 A. Calculate the average current and dc power of the field i. A1 F1 circuit when the triggering angle is equal to 15°. La Ra If A a P; W M • If the motor speed is to be increased to 1400 rpm, what is the F2 A2 triggering angle? (a) Circuit a =
Two shunt generations each having an armature resistance of 0.05 ohm and fieldresistance 40 ohms respectively are connected in parallel. The e.m.f include inone machine is 250 V and that induced in the other machine is 260 V. they supplytogether a load current of 2000 A. Determine the Output of each machine.
A DC, separately excited motor is used to drive a constant-torque load. The field circuit is excited by a full-wave, AC/DC SCR converter. The armature circuit of the motor is connected to a constant dc voltage source of 160 V. The inductance of the field circuit is large, and the field current is continuous. The field AC voltage (input to the converter) is 127 V (rms), and the field resistance is 110 N. The armature resistance is 2.2 N. When the triggering angle of the SCRS is adjusted to zero, the motor speed is 1300 rpm, and the armature current is 13 A. A1 • Calculate the average current and dc power of the field circuit when the triggering angle is equal to 15°. La Ra If 1.04 A Va M P¡ = 110.89 W A2 If the motor speed is to be increased to 1700 rpm, what is the triggering angle? (a) Circuit a =
A 220 V , 60 Hz , supply is connected to 200 – turn armature winding of reluctance 1.7x105 At / Wb . Find the magnetizing reactance , the rms values of the ( magneto – motive force , exciting and armature currents , magnetic flux ) , and the inductance Draw the phasor diagram of the circuit .
DC MACHINES EDDY CURRENT LOSS AND HYSTERESIS LOSS In a dc machine, running at 500 rpm the hysteresis and eddy current losses are 350watts and 100 watts respectively. Find the speed at which the total core loss arereduced by 30 percent.
A thicker wire is used in the DC series field winding than DC shunt field winding in DC machines. * O because it carries the load current. O to prevent mechanical vibrations. O to provide strength. O to produce large flux. The speed of a DC motor can be changed by varying - armature resistance circuit O flux per pole O voltage source O all of above
Q3/ A/ Compare between de series and shunt generator. Q3/ B/ Briefly explain the commutating process in dc machine.
Topic Electrical Machines - Magnetic & E... For a coil, each turn faces (2t4 – t³ – 2t) milliwebers of flux. The value of induced EMF in coil for 100 turns coil at 2 sec is, (in Volts).
i need a solution within 10 mints