Equalizer bus is necessary for the parallel operation of the:

Equalizer bus is necessary for the parallel operation of the: Correct Answer series and over compound generators

For satisfactory parallel operation of dc series generators and over the compound generator, it is necessary to connect the armatures of the two machines through a heavy copper bar, called the equalizing bar.

An equalizer bar has a low resistance conductor wire, which connects together the points in the armature winding which should be at the same potentials.

Important Points:

The functions of the equalizer bus are:

• To cause the circulating current to flow within the armature winding itself, without letting them pass through the brushes.
• To avoid unequal distribution of current at the brushes thereby helping to get sparkles commutation.
• To save the brushes from handling the circulating currents.
• To reduce the magnetic flux unbalance that cause the potential difference in various parallel paths.