IEEE C57.162-2025

Current Revision
IEEE Guide for the Interpretation of Moisture Related Parameters in Liquid Immersed Transformers and Reactors

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IEEE C57.162-2025

IEEE Guide for the Interpretation of Moisture Related Parameters in Liquid Immersed Transformers and Reactors

PUBLISH DATE 2026
PAGES 106
IEEE C57.162-2025

New IEEE Standard - Active.

It is widely accepted that one of the most significant contaminants affecting the performance of liquid-immersed transformers is moisture. Because of its importance, many standards and guides give various descriptions of the effects of moisture, recommendations on the acceptable levels of moisture, recommendations for the determination of moisture, and moisture mitigation techniques.

State-of-the-art knowledge for moisture-related parameters in liquid-immersed transformers has been consolidated in this guide, which is intended to serve as a reference for use by other standards and guides.

This reference document applies to liquid immersed transformers and reactors and addresses:

  • Moisture related phenomena and parameters in transformers and reactors
  • The theory of moisture dynamics in solid-liquid and solid-liquid-gas insulating physical complexes
  • Methods of assessment of moisture related parameters in solid-liquid and solid-liquid-gas insulating physical systems
  • The effects of moisture on operating transformers and reactors, and the risks associated with these effects
  • The establishment of a baseline for each moisture related parameter
  • The tracking and interpreting of changes against the baselines throughout the life of the transformer or reactor

This document recommends methods for:

  • The assessment of moisture and moisture related phenomena in liquid immersed transformers and reactors
  • The establishment of a baseline for each moisture related parameter
  • The tracking and interpreting of the changes against the baselines throughout the life of the unit
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