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Guide for the Interpretation of Gases Generated in Oil Immersed Transformers

Timothy L. O'Hearn, PE

This 3-hour course covers the procedures for analyzing gas from gas spaces or gas-collecting devices as well as gas dissolved in insulating oil in liquid immersed transformers. This course applies to mineral-oil-immersed transformers and addresses: (a) the theory of combustible gas generation in a transformer, (b) the interpretation of gas analysis, (c) suggested operating procedures, (d) various diagnostic techniques, such as key gases, Dornenberg ratios, Rogerís ratios, (e) instruments for detecting and determining the amount of combustible gases present, and (F) a bibliography of related literature.

Many techniques for the detection and the measurement of gases have been established. However, it must be recognized that analysis of these gases and interpretation of their significance is, at this time, not a science but an art subject to variability.

The purpose of this course is to provide guidance on specific methods and procedures that may assist the transformer operator in deciding on the status and continued operation of a transformer that exhibits combustible gas formation.

The course materials are based entirely on IEEE Std. C57.104 2008 IEEE Guide for the Interpretation of Gases Generated in Oil-Immersed Transformers, it will be necessary for the student to obtain a copy of IEEE Std. C57.104 2008. This is a very useful resource and is recommended for all practicing electrical or project engineers involved in the installation, specification, and maintenance of oil-immersed transformers.

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