IEEE 620-1981
Trial-Use Guide for Construction and Interpretation of Thermal Limit Curves for Squirrel-Cage Motors Over 500 HP

Standard No.

IEEE 620-1981

Release Date

1981

Published By

IEEE - The Institute of Electrical and Electronics Engineers@ Inc.

Status

Be replaced

Replace By

IEEE 620-1987

Latest

IEEE 620-2022

Scope

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. The guide also describes thermal limit curve* for large squirrel -cage motors defined as those motor ratings built in frames larger than the frame normally used for 500 hp@ 1800r/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.

IEEE 620-1981 history

• 1970 IEEE 620-2022 IEEE Guide for the Presentation of Thermal Limit Curves for Squirrel Cage Induction Machines
• 1996 IEEE 620-1996 Guide for the Presentation of Thermal Limit Curves for Squirrel Cage Induction Machines
• 1970 IEEE 620-1987 IEEE Guide for Construction and Interpretation of Thermal Limit Curves for Squirrel-Cage Motors Over 500 hp
• 1981 IEEE 620-1981 Trial-Use Guide for Construction and Interpretation of Thermal Limit Curves for Squirrel-Cage Motors Over 500 HP