Short Circuit Study & Protective Device Coordination

Why Short Circuit Study & Protective Device Coordination Matters

Every piece of equipment in a power distribution system — switchgear, circuit breakers, fuses, busway, cable — has a rating that reflects the maximum fault current it can safely withstand or interrupt. Short circuit study and protective device coordination training matters because it teaches engineers to calculate fault current accurately, compare it against equipment ratings, and identify underrated equipment before a fault exposes the gap. Without this analysis, facilities risk catastrophic equipment failure, extended outages, and safety hazards that a properly conducted study would have caught in advance.

Fault current calculations and protective device coordination are also inseparable from the arc flash studies that follow them: the short-circuit study's results feed directly into both the coordination study and the arc flash hazard analysis. Engineers who understand how these three studies interrelate are better equipped to interpret study results, validate assumptions made by study software, and make coordination decisions that balance equipment protection against the need to keep as much of the facility running as possible when a fault occurs.

This course can be taken as part of our 30-hour Power System Engineering Program - November 6-20, 2026

This course should be taken with our Power System Fundamentals Course - November 6, 2026

This course is also a companion to our Arc Flash Analysis Training Course - November 19-20, 2026

Short Circuit Study & Protective Device Coordination Overview

Short Circuit Study & Protective Device Coordination training equips electrical engineers with the technical knowledge required to calculate fault current magnitudes throughout an industrial, commercial, or institutional power system and to determine the settings, ratings, and characteristics of the protective devices that respond to those faults. Participants learn per-unit and ohmic calculation methods, symmetrical component theory, and how to model utility, motor, and generator fault contributions using Thevenin equivalent networks. This two-day instructor-led program combines calculation theory with applied exercises using industry-standard power system modeling software.

The Short Circuit Study portion of the course focuses on identifying the maximum available fault current at every bus in the system and comparing it against equipment interrupting and withstand ratings for switchgear, circuit breakers, fuses, busway, and conductors — the first checkpoint in verifying that a power system is safely protected. The Protective Device Coordination portion builds directly on those results, teaching participants how to select overcurrent device settings that protect transformers, generators, cables, buses, and motors while removing only the smallest necessary portion of the system from service to clear a fault.

Participants also study transformer, generator, conductor, and motor protection individually, along with fuse and circuit breaker time-current characteristics and coordination criteria such as current-time intervals (CTIs). The course is designed for utility, industrial, commercial, and institutional power system engineers, consulting and design engineers, and plant and facility engineers responsible for the reliable design, engineering, and operation of electric power distribution systems.

Short Circuit Study & Protective Device Coordination Outcomes

Upon completing this Short Circuit Study & Protective Device Coordination course, participants will be able to:

• Calculate maximum available fault current at any bus in a three-phase power system using per-unit and ohmic methods.
• Apply symmetrical component theory to balanced and unbalanced fault calculations.
• Compare calculated fault current against equipment interrupting and withstand ratings to identify underrated equipment.
• Model utility, motor, and generator fault contributions using Thevenin equivalent networks.
• Determine appropriate protective device settings for transformers, generators, cables, busway, and motors.
• Apply time-current characteristics and coordination criteria, including current-time intervals (CTIs), to achieve selective coordination.
• Evaluate fuse and low-voltage circuit breaker characteristics for coordination and current-limiting applications.
• Understand NEC and CEC code requirements as they apply to transformer, cable, and equipment protection.
• Model a typical industrial power system in professional short-circuit and coordination study software.
• Interpret short-circuit and coordination study results to support arc flash hazard analysis and overall system reliability.