Active standard | Published: 24/06/2026

IEEE PC57.166

IEEE Approved Draft Guide for Acceptance and Maintenance of Insulating Liquids in Transformers and Related Equipment

Available languages: English

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Detail information

Designation: IEEE PC57.166

Publication date: 24/06/2026

Pages: 0

Country: International technical standard

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Anotation

New IEEE Standard - Active - Draft.
Recommendations are made regarding tests and evaluation procedures of insulating liquids; references are made to methods of reconditioning and reclaiming insulating liquids; the levels at which these methods become necessary. The intent is to assist the power equipment operator in evaluating the serviceability of liquid insulation received in equipment, as received from the supplier for filling new equipment at the installation site, and as processed into such equipment; and to assist the operator in maintaining the insulating liquid in serviceable condition. The insulating liquids covered are used in transformers, reactors, load tap changers, and voltage regulators

ISBN: 979-8-8557-3081-4, 979-8-8557-3081-4
Number of Pages: 97
Product Code: STDUD28616, STDAPE28616
Keywords: insulating liquids, liquids, mineral oil, ester, natural ester, synthetic ester, silicone, transformer, load tap changer, maintenance, reconditioning, reclaiming
Category: Transformers
Draft Number: PC57.166/D7, Jan 2026 - UNAPPROVED DRAFT, PC57.166/D7, Jan 2026 - APPROVED DRAFT

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