Electrical Protection

• Motor Protection
• Transformer Protection
• Generator Protection
• Bus zone protection
• Local breaker backup protection
• Distribution feeder protection

MOTOR PROTECTION:- various motor protection of squirrel cage induction motors, which are common in industrial applications.

Key Points Summarized:

1. Overload Protection

• Motors may overload due to excessive current caused by factors like single phasing, mechanical load, or bearing faults. This can lead to insulation damage from overheating.

• Overload relays provide protection, usually set to trip the motor at 15–40% above the rated current.

• Thermal overload protection uses relays with time delay and exponential characteristics to match the motor’s thermal profile.

2. Single Phasing or Unbalance Protection

• Single phasing can lead to an unbalanced current, which may overheat the rotor and damage the motor.

• Protection relays monitor unbalanced voltage or current to detect single phasing and isolate the motor if needed.

3. Short Circuit Protection

• Short circuits in the winding or terminals can result in high current and damage the motor insulation.