Protective Device Coordination Course
Topics
System Analysis
Fault Current and Load Flow
Calculations Using Computer Software
Remote Effects Of Faults
Overview of hand calculation methods
Protective Device
Coordination Principles
Graphical Tools and
Time/Current Curve Interpretation
Load Flow and Unbalanced
Fault Effects
Cold Load Pickup
Grounding System Constraints
Coordination Economics
Asymmetrical Current Impacts
Coordination Time Intervals
Transformer Effects on
Coordination
Equipment and
Device Characteristics
Fuses - Low Voltage and
Medium Voltage
Molded case and Insulated
Case Breakers
Solid-State Trip Low Voltage
Breakers
Equipment Damage
Characteristics
Proper Protective Device
Selection
High Voltage Breakers
Low Voltage Cable Protection
Shielded Cable Protection
Overhead Conductor Protection
Motor Protection
Generator Protection
Transformer Protection
Panelboard and Switchgear
Protection
Inverse Time/Overcurrent
Protective Relays and Instantaneous Trip
Devices
Series Rated Breakers
Differential and Voltage
Constrained Relays
Reclosing relays, reclosers,
and sectionalizers
Current transformer
characteristics and calculations
Ground Fault Protection
Arcing Ground Fault
Magnitudes
Ground Fault Protection
Schemes
Interaction Of Ground Fault
Relays And Phase Overcurrent Devices
Emergency Power System
Design
Weak Source Systems
Generator Fault
Characteristics
Uninterruptible Power Supply
Fault Characteristics
Transfer and Static Switch
Limitations
Improving Emergency Circuit
Design
Common Coordination
Problems, Errors, And Misconceptions
Preliminary System
One-line Development for a Coordinated
System
Lessons Learned and
“Rules of Thumb” to spot uncoordinated
systems and methods to develop a coordinated
system design
Criteria Impacting
Coordination
NESC, I.E.E.E. Std C2,
NFPA 70-National Electrical
Code
NFPA 70E -
(Arc Flash
Protection of Employees)
Military UFC and FAA Criteria
(this material is only added for those
students who are government employees or
consultants to the government)
Switchgear And Relay
Commissioning
Hands-On Student Calibration
Of A Relay (Student will actually run the
test set)
8 classroom hours will
be used to work example design problems with
student involvement in the following system
types. Students are
encouraged to bring their own system
problems for class analysis.
Low voltage system with
critical systems fed from normal and
emergency power sources
Medium voltage system from a
15 kV class substation primary to the low
voltage secondary.
Specification Writing
for a Coordinated System |
