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
impact force equation of ship to jetty?

Calculated the magnitude of the instantaneous stress: While a concentrated force of 1 kN is applied at the midspan point of a simply supported beam a static deflection of 5 mm

Show schematic diagram showing the layout of transmission system of four-wheel driven car. Explain briefly the following types of frame: (a) Conventional frame (b) Integra

constructing and working of he- ne laser

Estimate temperature of air at exit from compressor: The air compressor compresses atmospheric air at 0.1MPa and 27 0 C 10 times the inlet pressure. During compression heat

Steels Plain carbon & C - Mn steels : Because of low heat input, in as welded condition, the micro structures of the autogenous process welds predominantly show marten

Kineti c (Dynamic) Friction: When applied force exceeds limiting friction the body starts moving over the other body and the friction of resistance experienced by the body a

Explain Bevel Gear Generating Process? The fundamental of bevel gear generating process involves the rolling of a bevel gear blank on a crown wheel. The crown wheel is a bevel

Using Bode plot calculate (a) Phase margin (b) Gain margin (c) Stability of closed loop system. The open transfer function of the system is

Determine an expression for the minimum number of teeth on a pinion which is in mesh with a rack in order to avoid interference and show the minimum number of teeth needed on a pin