This guide is applicable to liquid-immersed transformers and reactors and provides a comprehensive examination of cellulose insulation systems. It presents an introduction to and historical context for the use of cellulose in electrical insulation, encompassing both its inherent advantages and known limitations. The guide addresses the aging mechanisms of cellulose within liquid-immersed transformers and reactors containing mineral oil, natural or synthetic esters, or silicone-based dielectric liquids. Subject matter includes diagnostic testing methodologies for evaluating cellulose degradation, along with guidance on the interpretation of results, and the influence of transformer and reactor design, construction practices, and operational parameters on cellulose condition. Further topics encompass the behavior and fate of cellulose aging by-products and markers as a function of liquid processing activities, quantitative methods for cellulose service life estimation and associated risk assessment, illustrative case studies and practical examples, and a comprehensive bibliography of relevant literature.
- Standard Committee
- PE/TR - Transformers
- Status
- Active PAR
- PAR Approval
- 2026-06-04
Working Group Details
- Society
- IEEE Power and Energy Society
- Standard Committee
- PE/TR - Transformers
- Working Group
-
PC57.41 - IEEE Guide to the Interpretation of Tests for the Degradation of Cellulosic Materials in Liquid-Filled Transformers and Reactors
- Working Group Chair
- Lance Lewand
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