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Full Description

Scope

This standard specifies standard service conditions, standard ratings, performance requirements, and testing requirements for relays and relay systems used to protect and control power apparatus. A relay system may include computer interface equipment and/or communications interface equipment, such as a carrier transmitter/receiver or audio tone equipment. It does not cover relays designed primarily for industrial control, for switching communication or other low-level signals, or any other equipment not intended for control of power apparatus.

Purpose

The purpose of this standard is to establish a common reproducible basis for designing and evaluating relays and relay systems.

Abstract

Revision Standard - Inactive-Reserved. Service conditions, electrical ratings, thermal ratings, and testing requirements are defined for relays and relay systems used to protect and control power apparatus. This standard establishes a common reproducible basis for designing and evaluating relays and relay systems.
 

Document History

  1. IEEE C37.90-2005

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    IEEE Standard for Relays and Relay Systems Associated with Electric Power Apparatus

    • Most Recent
  2. IEEE C37.90-1989


    IEEE Standard for Relays and Relay Systems Associated with Electric Power Apparatus

    • Historical Version