Why generator is overloaded and heating

Symptoms of an Overloaded DC Generator

• Excessive sparking occurs at brushes.
• Overheating of the armature and other parts of the generator.

What causes overloading in DC Generator

• Overloading is caused by reversal of polarity.
• Overloading is caused by too high speed of the prime mover.
• Overloading is caused by excessive voltage due to over excitation of field magnets.
• Excessive current due to bad feeling of load or short circuit in the generator itself or in the external load circuit.

Why generator is heating during its operation

• Defective bearing.
• Weak insulation in the lamination.
• Short circuit in field winding and armature winding.
• Sparking at the brushes.

What causes unusual sound in DC Generator

• Defective bearing.
• Weak insulation in the lamination.
• Short circuit in field winding and armature winding.
• Sparking at the brushes.