The objective of this module is to present the broad categories of line configuration and discuss the various types of protection schemes that are employed. Particular attention is paid to coordination for selective tripping and isolation of faulty circuits. After study of this course and the associated workbook, participants should be able to understand the following overall concepts and apply them to their day-to-day work activities. They will also be able to answer related test questions on these subjects: Classification of lines and feeders, Typical system configurations, Faults on radial and loop systems, Reclosing arrangements, Breaker failure protection, Application of overcurrent relays, Setting of relay pickup and time dial, Coordination with downstream fuses and reclosers, Coordination procedure for loop systems, Maximum and minimum fault levels, Application of instantaneous overcurrent relays, Voltage control (restraint) overcurrent relays, Ground fault protection with directional overcurrent relays, Polarizing sources; current; voltage, Polarizing by negative sequence voltage, Effects of mutual induction, Limitations of overcurrent relays, Characteristics of distance relays, RX diagram, Protection zones; primary and backup, Multiple lines and power sources, Tapped lines; multi-terminal lines, Ground fault protection by distance relays, Backup protection.
If you are taking this course for NERC credit, the following credits will be reported.
NERC CE HOURS: CE HOURS = 4.00 OPS Topics=4.00 Standards=0.00 Simulation=0.00 EO=0.00
- Trainees will be able to describe the main features of different types of line installations, including typical voltage levels, grounding arrangements, configurations and direction of fault current flow.
- Trainees will be able to describe the application of inverse time and instantaneous overcurrent relays to the protection of radial circuits.
- Trainees will be able to explain the coordination of protection systems with downstream protective devices.
- Trainees will be able to describe overcurrent protection for a closed loop system, including necessary coordination of various protection devices.
- Trainees will be able to describe the use of overcurrent relays for ground fault protection.
- Trainees will be able to describe the operation of distance relays.
- Trainees will be able to explain the potential problems that can occur when distance relays are installed on multiple terminal lines and complex systems.
SEGMENT A - BASIC TRIGONOMETRY REFRESHERSEGMENT B - IMPEDANCESEGMENT C - CIRCUIT RESONANCESEGMENT D - VOLTAGE DROP
End of Course Instructions
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