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

The information about the standard:

Designation standards: IEEE PC57.139
Publication date standards: 24.12.2026
Approximate weight : 300 g (0.66 lbs)
Country: International technical standard
Category: Technical standards IEEE

Annotation of standard text IEEE PC57.139 :

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