This virtual training is designed for engineers and technicians involved with protective relaying. Knowledge of fault current including symmetrical components is a must for protection engineers and engineers involved with engineers who specify electrical equipment. Any analysis of system events involving protective relaying requires a sound knowledge of fault analysis.

Course Outline:

• Calculation of three phase faults using Ohmic method
• Per unit method for simplifying fault current calculations
• Worked-out example using per unit method— 3ph, ph-ph, and ph-ground
• Typical values of per unit impedances for generators, motors, transformers, etc.
• Basic concept of symmetrical components and using them to calculate fault currents
• Fault current relationship involving different transformer connections
• Worked-out example using a commercial software
• Symmetrical and unsymmetrical components of fault current
• What is DC offset?
• Response of relays to DC offset
• Relay response depends on time elapsed since fault inception
• Fault current duties experienced by interrupting devices such as fuses, breakers, etc.
• Evaluation of interrupting devices based on first cycle duty and symmetrical duty