Short Circuit Study & Protective Device Coordination course is designed for utility, industrial, commercial and institutional power system electrical engineering personnel, electrical consulting engineers, as well as electrical design engineers, who are responsible for the reliable design, engineering and operation and of industrial, commercial and insitutional electric power distribution systems. Plant, facility, and corporate electrical engineers dealing with one or more company distribution systems and consulting and utility engineers dealing with clients' systems. Consultants, architect-engineers will also find this course very beneficial.
Short Circuit Study - Protective Device Coordination
Short Circuit Study & Protective Device Coordination training teaches electrical engineers how to calculate available fault current throughout a power system, verify that equipment is adequately rated to withstand it, and determine the protective device settings that isolate faults quickly while keeping the rest of the system in service.
Our 12-hour instructor-led course runs over two days, live online and in person. Participants learn to perform, document and validate both studies on industrial, commercial and institutional power systems.
Why Short Circuit Study & Protective Device Coordination Matters
Underrated equipment can fail violently during a fault. Poor coordination turns a branch-circuit fault into a facility-wide outage. The short circuit study finds underrated equipment before a fault does. The coordination study makes sure the closest upstream device clears the fault first. Both studies feed the arc flash analysis directly, so errors made here carry into every arc flash label.
Short Circuit Study & Protective Device Coordination Overview
Day One: the short circuit study
- Fault current sources, including the limited contribution of inverter-based resources.
- Symmetrical and asymmetrical current, X/R ratio and decrement.
- ANSI/IEEE C37 and IEC 60909 calculation methods.
- Symmetrical components for unbalanced faults.
- Equipment duty evaluation for LV and MV breakers, fuses, series-rated combinations, busway and cable, and remedies for underrated equipment.
Day Two: the coordination study
- Data collection and time-current curves, coordination margins and CTIs.
- Fuse and LV circuit breaker characteristics.
- Overcurrent relay curves as they appear on a TCC.
- Code-driven apparatus protection for transformers, cables, motors and generators.
- Ground-fault coordination and NEC selective coordination requirements.
The course closes with study deliverables and model validation. Relay hardware, CT/VT application and relay setting design are covered in our Basic Protective Relay Training course.
Learning Outcomes
Upon completing this course, participants will be able to:
- Identify fault current sources and their contributions, including inverter-based resources.
- Calculate three-phase and unbalanced fault currents using per-unit methods and symmetrical components.
- Apply ANSI/IEEE C37 and IEC 60909 calculation methods and explain their differences.
- Evaluate interrupting and withstand duty for LV and MV equipment and recommend remedies for underrated equipment.
- Collect and organize the data required for a coordination study.
- Plot and interpret TCCs for fuses, LV breakers and overcurrent relays.
- Apply coordination margins and CTIs to achieve selectivity.
- Apply NEC and CEC protection requirements for transformers, cables, motors and generators.
- Coordinate ground-fault protection and meet NEC selective coordination requirements.
- Prepare study deliverables and validate software results.
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Course Benefits
- This Course Includes Our Latest Electrical Electrical Protection And Arc Flash Safety Handbooks!! (Value $20)
- Certificate of Course Completion
- $100 Coupon Toward Any Future Electricity Forum Event (Restrictions Apply)
- Course Materials in PDF Format
- 1.2 Continuing Education Unit (CEU) Credits (12 Professional Development Hours)
- FREE Magazine Subscription (Value $50.00)
Short Circuit Study & Protective Device Coordination Training Course Outline
DAY ONE
1. Short Circuit Fundamentals
- Effects of short circuits: thermal and mechanical stress, arcing
- Fault current sources: utility, generators, motors, inverter-based resources
- Symmetrical vs asymmetrical current, X/R ratio
- AC and DC decrement
2. Fault Calculation Methods
- Per-unit refresher and Thevenin equivalents
- Utility data and infinite-bus assumptions
- ANSI/IEEE C37: first-cycle, interrupting and 30-cycle networks
- IEC 60909 overview
- Exercise: hand-calculate a three-phase bolted fault
3. Unbalanced Faults
- Symmetrical components
- Single line-to-ground, line-to-line and double line-to-ground faults
- Effect of system grounding on ground-fault current
4. Equipment Duty Evaluation
- LV fuses and circuit breakers: interrupting ratings and test X/R
- MV circuit breakers and power fuses
- Series ratings and fully rated systems
- SCCR, busway and conductor withstand
- Remedies for underrated equipment
- Exercise: equipment duty evaluation in study software
DAY TWO
5. Coordination Study Principles
- Protection vs selectivity
- Data collection for a coordination study
- Reading and building TCCs
- Coordination margins and CTIs
6. Fuses and LV Circuit Breakers
- Fuse classes, melting and clearing curves, current limitation
- MCCBs, ICCBs and LVPCBs
- LSIG trip units
- Manufacturer selectivity tables
7. Overcurrent Relays on the TCC
- IEEE and IEC inverse curve families
- Pickup and time dial as plotted
- Relay-to-fuse and relay-to-breaker coordination
8. Apparatus Protection
- Transformers: NEC 450 / CEC Rule 26, through-fault curves, inrush
- Cables: damage curves and overload protection
- Motors: NEC 430, overload and short-circuit protection
- Generators: decrement and protection considerations
9. Ground-Fault and Selective Coordination
- Ground-fault protection schemes and coordination
- NEC 700.32, 701.32, 708 and 620.62 requirements
10. Study Deliverables and Validation
- Report contents and recommendations
- Model validation and common errors
- Exercise: coordinate a sample industrial system
Course Schedule
Start: 10 a.m. Eastern Time
Finish: 4:30 p.m. Eastern Time
Live online course registration fees & CEU credits
The registration fee for this course is $699.
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Earn Continuing Education Unit (CEU) Credits
- Successful completion of this course qualifies delegates to receive a certificate of course completion with indicated CEUs.
- One CEU is equivalent to 10 professional development hours of instruction.
- This course earns 1.2 CEUs.
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Fill out the form below with your name and email address.
2
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3
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Group Offer
Register 3, Get 1 Free
Register 3 delegates at the full price of $249 each and get the 4th registration free! Perfect for companies, safety departments, and teams looking to train multiple employees at once.
1st
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2nd
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