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Permissible Loading of Generators and Large Motors

Bijan Ghayour, PE

This 2-hour course is intended to fill the need for practical information concerning the temperature and mechanical and electrical overload limits of rotating electric equipment such as generators and large motors. Rotating electrical equipment cannot be overloaded on the same basis as transformers and is not as able to stand short-time overloads. This is largely because equipment cooled by air does not have the heat transfer ability which the higher thermal conductivity of insulating oil gives to transformers; also, the windings in rotating equipment are confined in slots in the steel and are subject to temperature expansion problems. For any abnormal loading of generators, the electrical, mechanical, and thermal characteristics must be evaluated to determine the machines limitations.

Machines should not be loaded beyond the manufacturer's defined overload capability unless a complete study of the unit has been made to define safe limits. Additional tests might have to be conducted to substantiate the possibilities for higher-than-rated loadings.

The course materials are based entirely on the Unified States Department of the Interior, Facilities Instructions, Standards, and Techniques Volume 1-4.

This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of course materials.

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NY PE & PLS: You must choose courses that are technical in nature or related to matters of laws and ethics contributing to the health and welfare of the public. NY Board does not accept courses related to office management, risk management, leadership, marketing, accounting, financial planning, real estate, and basic CAD. Specific course topics that are on the borderline and are not acceptable by the NY Board have been noted under the course description on our website.