350-02 - Types of Protective Relays
Learning objectives
- Recall the purpose of relay protection schemes
- Identify the eight types of transmission circuits subject to relay loadability
- Identify the five types of generation facilities subject to relay loadability
- Recall the evolution of relay design
- List the three major types of relay construction and explain how they differ
- Identify the conditions causing the basic operation of instantaneous relays
- Identify the strengths and limitations of instantaneous relays
- Identify the strengths and limitations of time delay relays
- Identify the strengths and limitations of differential relays
- Recall how directionality can be obtained in an AC power system
- Recall how impedance is used to detect faults on the electric system
- Identify why overlapping zone protection is needed when using impedance relays
Course overview
Relay protection technology has changed over the years, but the underlying principles of operation have remained relatively unchanged. While there are numerous makes and models of relays in use, they generally fall into a handful of basic categories geared towards a specific purpose.
The individuals involved in the development and promotion of this course do not receive any compensation or financial benefits outside of their regular employment for their work on this course.
