GB/T 41633.3-2022 (English Version) PDF

Standard No.: GB/T 41633.3-2022
Language: Chinese, Available in English version
Release Date: 2022
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 41633.3-2022

Scope: This document describes two test methods for the acid value of unused and used non-mineral insulating oils for electrical purposes: potentiometric and colorimetric. Note 1: In unused and used electrical non-mineral insulating oils, acidic components include organic acids, phenolic compounds, oxidation products, resins, organic metal salts and additives. This document can be used to indicate the relative change of non-mineral insulating oils for electrical purposes during use under oxidizing conditions, regardless of whether their color or other characteristics change. Acid value can be used for quality control of unused non-mineral insulating oils for electrical purposes. Oxidation products present in used electrical non-mineral insulating oils will affect its acid value, and these oxidation products have large differences in corrosion characteristics, so this document cannot be used to predict non-mineral electrical insulating oils in use. Corrosiveness of insulating oil. Note 2: The acid value results measured by potentiometric titration and the acid value results measured by colorimetric titration may be the same or different in value, but they are usually in the same order of magnitude.

GB/T 41633.3-2022 Referenced Document

IEC 60475 Method of sampling insulating liquids
ISO 6619 Petroleum products and lubricants; neutralization number; potentiometric titration method

2022 GB/T 41633.3-2022 Insulating liquids—Determination of acidity—Part 3:Test methods for non-mineral insulating oils