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Parallel Operation

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Sparking in DC Generators

The following are the most probable reasons to cause sparking in DC generator.

  • Due to brushes
  • Due to armature
  • Due to commutator

Sparking due to Brushes

  • In correct position of the brushes.
  • Unequal brush spacing.
  • Worm out brushes.
  • Inadequate pressure on brushes.
  • Carbon brushes short circuit more segments at time.
  • Wrong grade of brushes.
  • Brushes not properly bedded.

Sparking due to Armature

  • Overloading of armature.
  • Earth fault in armature windings.
  • Short circuit in the armature coils.
  • Play in the armature.

Sparking due to Commutator

  • Weak mica between segments of commutator.
  • Rough commutator surface.
  • Commutator is not fully round.
  • Segments short circuited by carbon filing.
  • Oil and dirt on commutator surface.

Sparking due to Pole

  • Projection of intersegment micas.
  • Reversed interpole polarity.
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