A single phase synchronous generator was open-circuit and short-circuit tested. During an open circuit test of the synchronous machine, nominal voltage of 220 V was obtained for the field current of IfNL = 6 A while for short-circuit test, rated current of 8 A was reached for the field current of IfSC = 5 A. The synchronous generator is connected to rated voltage of 220 V. Assuming negligible armature resistance determine: a. internal voltage E (behind Xs), under rated current and power factor of 0.8 lagging; b. for the internal voltage from (a) determine the steady-state stability limit. Note: Xs is ratio of IfSC / IfNL
Synchronous Generator
In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.
Salient Pole Rotor
Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.
A single phase synchronous generator was open-circuit and short-circuit tested. During an open
circuit test of the synchronous machine, nominal voltage of 220 V was obtained for the field
current of IfNL = 6 A while for short-circuit test, rated current of 8 A was reached for the field
current of IfSC = 5 A. The synchronous generator is connected to rated voltage of 220 V.
Assuming negligible armature resistance determine:
a. internal voltage E (behind Xs), under rated current and power factor of 0.8 lagging;
b. for the internal voltage from (a) determine the steady-state stability limit.
Note: Xs is ratio of IfSC / IfNL
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