Protective Relays

Learning objectives

  • Describe the operating principles behind protective relays
  • Identify the essential requirements of relay protection
  • List the ANSI standard device-function numbers that identify relays
  • Describe the two types of electromechanical relays
  • Discuss the benefits of solid-state relays

Course overview

Protection relays shield personnel and equipment from catastrophic damage caused by an uncontrolled short circuit or ground fault. Relays act quickly, disconnecting power from the fault area while leaving the rest of the system unaffected. To ensure safety and reliability, technicians must understand the protection system.

The Protection Relays training course identifies protection relay elements on an electrical drawing according to the ANSI (American National Standards Institute) standard device numbers. It also describes basic relay operations. This online course compares the accuracy and options provided by commonly used relays.

This course focuses on:

  • Protection relay basics
  • Protection relay functions
  • Electromechanical relays
  • Electronic relays

Protection Relays is part of the Electrical Protection and Grounding training series.

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