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.
- 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