AC Generators AC GENERATOR OPERATIONAC GENERATOR OPERATIONBecause of the nature of AC voltage and current, the operation of an ACgenerator requires that rules and procedures be followed. In addition, there arevarious types of AC generators available, each type having advantages anddisadvantages.EO 1.5 DESCRIBE the bases behind the kW and currentratings of an AC generator.EO 1.6 DESCRIBE the conditions that must be met prior toparalleling two AC generators including consequences ofnot meeting these conditions.EO 1.7 DESCRIBE the difference between a stationary field,rotating armature AC generator and a rotating field,stationary armature AC generator.EO 1.8 EXPLAIN the differences between a wye-connected anddelta-connected AC generator including advantages anddisadvantages of each type.RatingsTypical name plate data for an AC generatorFigure 4 AC Generator Nameplate Ratings(Figure 4) includes: (1) manufacturer; (2)serial number and type number; (3) speed(rpm), number of poles, frequency of output,number of phases, and maximum supplyvoltage; (4) capacity rating in KVA and kWat a specified power factor and maximumoutput voltage; (5) armature and field currentper phase; and (6) maximum temperature rise.Power (kW) ratings of an AC generator arebased on the ability of the prime mover toovercome generator losses and the ability ofthe machine to dissipate the internallygenerated heat. The current rating of an ACgenerator is based on the insulation rating ofthe machine.Rev. 0 Page 9 ES-10
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