Characteristics of DC Series generator




  •     If the load circuit of the dc series generator is kept open, the field current flows through the field winding of the generator.
  •     Therefore in order to obtain the open circuit characteristics of dc series generator its field should be excited separately giving supply from external source.
  •     The open circuit characteristics of dc series generator oa will have the same shape as that of dc shunt generator. I
  •    If the dc series generator is self excited, the emf. induced in the armature Vg at any field current i.e. armature current will be less than the emf. induced E0 on open circuit due to armature reaction.
  •      Therefore the internal characteristics of dc series generator ob will be below the open circuit characteristics oa as shown in the figure.
  •     The difference between these two curves indicates the voltage drop due to armature reaction effect.
  •      The external characteristics of the dc series generator oc will lie below the internal characteristics ob by an amount equal to the armature resistance drop.



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