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
degrees of freedom of a planar mechanism


How a governor works? I mean how it''s regulate the speed of for example electricity generators?

Find the value of force to move a system: Th e system of particles shown in the figure given below is initially at rest. Find the value of force F which should be applied so

Coplanar and Non-Coplanar Forces: In this unit, you have learnt to identify the different systems of forces. You have also learnt the many techniques of adding the forces to g

Dryness fraction measurement: Sensible Hea t of Water or Heat of Liquid or Enthalpy of Liquid (h) Sol.: It is quantity of heat which is required to raise unit mass

Types of stresses: In general stress is divided in to three group as: various types of stresses may be classified as: 1. Simple or direct stress (Tension, Compressi


Theoretical Results In the particular machine case, several theoretical results are identified or can be derived: (a) If each operation can be scheduled such that everyone

Details of rolling process,Different rolling methods,