Calculation of short circuit values is essential in power system analysis. The results are used in a number of applications like sizing of breakers and other elements of power systems, designing grounding grids, setting protective equipment, evaluating Total Harmonic Distortion (THD) of harmonic currents, and performing arc flash analysis.

Chapter Contents:

• 4.1 Nature of short circuit currents
• 4.2 Calculation of fault duty values
• 4.3 Fault calculation for symmetrical faults
• 4.4 Symmetrical components
• 4.4.1 Importance and construction of sequence networks
• 4.4.2 Calculation of asymmetrical faults using symmetrical components
• 4.4.3 Equivalent impedances for a power system
• 4.4.4 Supplying the current and voltage signals to protection systems
• Proposed exercise

Inspec keywords: power system harmonics; power grids; earthing; harmonic distortion; arcs (electric)

Other keywords: THD; harmonic currents; breakers; power system analysis; short circuit calculation; total harmonic distortion; protective equipment; arc flash analysis; grounding grids

Subjects: Power supply quality and harmonics; Power system protection; Dielectric breakdown and discharges