Find the machine torque angle, Mechanical Engineering

Find the Machine Torque Angle

(a)  What are the four operating conditions that must be satisfied before a synchronous machine can be synchronised to an electrical grid?

(b)  A three phase Y-connected cylindrical rotor synchronous generator is operating into a grid at its rated l-l voltage of 6000V, with a rated stator current of 200A at a 0.8 lagging power factor. If the generator has a synchronous reactance of Xs = 10 Ω /phase and negligible stator winding resistance, find:

i.  The real and reactive power flow into the grid.

ii.  The internal back-emf Eo.

iii.  The machine torque angle δ (in electrical degrees).

(c)  Calculate the new torque angle, stator current and machine power factor if the field excitation is changed to reduce the generator internal back-emf to 1.2 pu. Is the generator supplying or sinking reactive power? Sketch a phasor diagram for this operating condition.

(d)  Sketch the capability diagram for this synchronous machine for 1 pu and 1.5 pu excitation levels, and show how the practical operating region can be identified on this diagram by considering various machine operating limits.

Posted Date: 2/18/2013 2:47:38 AM | Location : United States







Related Discussions:- Find the machine torque angle, Assignment Help, Ask Question on Find the machine torque angle, Get Answer, Expert's Help, Find the machine torque angle Discussions

Write discussion on Find the machine torque angle
Your posts are moderated
Related Questions
Calculate pressure on each side of spherical ball : Heavy spherical ball of weight W rests in V shaped trough whose sides are inclined at the angles and to the horizontal

Law of coulomb friction: Coulomb in the year 1781 presented certain conclusions which are called as Coulomb's law of friction. These observations are based on experiments on b

working principle of land fill bio gas plant

Before installing a bolt, stud or nut, threads shall be examined to ensure that there are no incompletely cut threads in the engagement zone (both internal and external) or burns,

Evaluate secure axial load: A small piece of ISA (200 × 100 × 15) angle carries a compressive load, the line of action of which coincides along the intersection of the middle


Dry Saturated Steam - thermodynamics: A dry saturated steam is single phase medium. It does not have any water particle. It can be obtained on complete evaporation of water at

Which three principal possible in radial drilling machine Between them the plain drill machine, three principal movements are possible in this type of machine, by vertical move

Q. Corrosion Assessment of Flare and VRU System? The worst case scenario shall be considered during material selection of Flare KO Drums. Depending on the fluid composition ent

what is the formula of sensitivity of governor?