Active standard | Published: 24/12/2026

IEEE PC57.139

IEEE Approved Draft Guide for the Interpretation of Gases generated in Liquid-Type On-Load Tap-Changers

Available languages: English

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Detail information

Designation: IEEE PC57.139

Publication date: 24/12/2026

Pages: 0

Country: International technical standard

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Anotation

Revision Standard - Active - Draft.
General types of on-load tap-changer (OLTC) mechanisms, breathing configurations, and electrical designs, described for reference for determining methods of testing and evaluating dissolved gases in mineral-based transformer oils in OLTCs, are discussed and recommended in this guide. Measurements of dissolved gas concentrations in the OLTC oil are required to implement this guide. This guide is not manufacturer specific, rather category specific.

ISBN: 979-8-8557-3464-5, 979-8-8557-3464-5
Number of Pages: 66
Product Code: STDUD28840, STDAPE28840
Keywords: DGA, dissolved gas-in-oil analysis, IEEE C57.139™, on-load tap-changer, OLTC
Category: Transformers
Draft Number: PC57.139/D3.2, Apr 2026 - UNAPPROVED DRAFT, PC57.139/D3.2, Apr 2026 - APPROVED DRAFT

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