# The loss data for the synchronous generator of Problem 13.3.2 are: Determine the efficiency of…

The loss data for the synchronous generator of Problem 13.3.2 are:

Determine the efficiency of the generator at rated load, rated voltage, and 0.8 power factor lagging.

Problem 13.3.2

A three-phase, wye-connected, 2300-V, fourpole, 1000-kVA, 60-Hz synchronous machine has a synchronous reactance Xs = 5 , a field resistance Rf = 10, and an approximately linear magnetization characteristic (Ef versus If ) with a slope Kag = 200 . The machine is connected to a balanced three-phase ac system and is used as a generator. Determine the following:
(a) The rated stator current.
(b) The exciter setting Vex = If Rf for operating the machine at rated conditions, at a power factor of (i) 0.866 lagging and (ii) 0.866 leading.
(c) Vex in part (b) for unity power factor and the same real power output as in part (b).
(d) The complex power delivered by the generator to the system for parts (b) and (c).

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