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AC Generators AC GENERATOR OPERATION AC GENERATOR OPERATION Because  of  the  nature  of  AC  voltage  and  current,  the  operation  of  an  AC generator requires that rules and procedures be followed.   In addition, there are various  types  of  AC  generators  available,  each  type  having  advantages  and disadvantages. EO 1.5 DESCRIBE   the   bases   behind   the   kW   and   current ratings of an AC generator. EO 1.6 DESCRIBE  the  conditions  that  must  be  met  prior  to paralleling two AC generators including consequences of not 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 and delta-connected AC generator including advantages and disadvantages of each type. Ratings Typical name plate data for an AC generator Figure 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   supply voltage;  (4) capacity  rating  in KVA  and  kW at  a  specified  power  factor  and  maximum output voltage; (5) armature and field current per phase; and (6) maximum temperature rise. Power  (kW)  ratings  of  an  AC  generator  are based  on  the  ability  of  the  prime  mover  to overcome  generator  losses  and  the  ability  of the    machine    to    dissipate    the    internally generated heat.   The current rating of an AC generator is based on the insulation rating of the machine. Rev. 0 Page 9 ES-10


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