The direct axis and quadrature axis reactance of a salient pole alternator are 1.2 p.u and 1.0 p.u respectively. The armature resistance is negligible. If the alternator is delivering rated kVA at upf and at rated voltage then its power angle is
45°
Rated voltage and current are both1 pu at unity power factor. For a salient-pole generator, tanδ=XqI/(V)=1·1/1=1. Hence δ=45°. Xd affects the required excitation, not this angle relation.
Important Questions from Alternator and Synchronous Motors
Torques are associated with synchronous motor; which of the following torques is also known as breakaway torque?
At unity power factor, armature reaction of an alternator is:
A three-phase synchronous motor will have:
Which of the following factors should be identical for two alternators running in parallel?
A DC generator without commutator is a/an:
