Ward-Leonard controlled Direct current (dc) drives are generally used for

Ward-Leonard controlled Direct current (dc) drives are generally used for

Right Answer is:

Heavy duty Excavator

SOLUTION

Advantages of Ward Leonard

  1. Capable of producing regenerative braking thus delivering electrical energy to the grid. Therefore, the scheme adopts the conservation of energy. Besides, it is suitable for four-quadrant operation.
  2. This system is commonly employed for elevators, hoists, heavy-duty excavators, and main drives in steel mills, as this method, can give unlimited speed control in either direction. Since the generator voltage can be varied gradually from zero, no extra starting equipment is required to start up the main motor smoothly.
  3. Speed reversal is smooth and does not require any external resistance or any special starting gear;
  4. The arrangement is neat and clean and relatively free from maintenance problems.
  5. The lagging reactive volt-amperes of a plant can be neutralized, by using an over-excited synchronous motor. The overall power factor of the plant also improves.
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