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Full Description

Scope

2.1 This guide defines thermal limit curves, recommends a standard procedure for construction of the curves, and provides the definitions and information necessary to properly use these curves. 2.2 The guide also describes thermal limit curves for large squirrel-cage motors defined as those motor ratings built in frames larger than the frame normally used for 500 hp, 1800 r/min motors.

Purpose

The purpose of this guide is to assist in a uniform understanding of the construction, interpretation, and use of motor thermal limit curves.

Abstract

New IEEE Standard - Inactive-Withdrawn. Thermal limit curves for induction machines are defined. A procedure is established for the presentation of these curves, and guidance for the interpretation and use of these curves for machine thermal protection is provided.
 

Document History

  1. IEEE 620-2022


    IEEE Guide for the Presentation of Thermal Limit Curves for Squirrel Cage Induction Machines

    • Most Recent
  2. IEEE 620-1996


    IEEE Guide for the Presentation of Thermal Limit Curves for Squirrel Cage Induction Machines

    • Historical Version
  3. IEEE 620-1987

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    IEEE Guide for Construction and Interpretation of Thermal Limit Curves for Squirrel-Cage Motors Over 500 hp

    • Historical Version