Basic Concepts Protections:

• • Introduction. Most common faults: Short circuits.
  • Over and under voltage.
  • Atmospheric Discharges.
  • Electrical overloads.
  • Mechanical Stresses (Motors).
  • Protection requirements.
  • Response speed.
  • Selectivity.
  • Security.
  • Reliability.
  • IEEE Nomenclature.
  • Primary and backup protection.
  • Areas of coverage of the protections.
  • Protection and metering transformers.

Overcurrent protection:

• • Thermal damage curves of electrical equipment.
  • Criteria for selecting settings in an overcurrent device.
  • Coordination criteria for overcurrent protection.
  • Selectivity curves. Ground overcurrent.
  • Adjustment and coordination criteria.

Overcurrent Protection Elements:

• Overcurrent Relay.
• Thermal protection relay for induction motors.
• Low Voltage Switchgear.
• Fuses.