ASTM D1934 method for Oxidative Aging of Electrical Insulating Petroleum Oils
ASTM D1934 Standard Test Method for Oxidative Aging of Electrical Insulating Petroleum Oils by Open-Beaker Method
1. Scope
1.1 This test method describes two procedures for subjecting electrical insulating oils to oxidative aging:
1.1.1 Procedure A, without a metal catalyst, and
1.1.2 Procedure B, with a metal catalyst.
1.2 This test method is applicable to oils used as impregnating or pressure media in electrical power transmission cables if less than 10 % of the oil evaporates during the aging procedures. It applies and is generally useful primarily in the evaluation and quality control of unused oils, either inhibited or uninhibited.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D664 Test Method for Acid Number of Petroleum Products by Potentiometric Titration
D923 Test Method for Sampling Electrical Insulating Liquids
D924 Test Method for Dissipation Factor (or Power Factor) and Relative Permittivity (Dielectric Constant) of Electrical Insulating Liquids
D1169 Test Method for Specific Resistance (Resistivity) of Electrical Insulating Liquids
E 145 Specification for Gravity-Convection and Forced-Ventilation Ovens
E 177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 metal catalyst - any metal (for example, copper) that either increases the rate of oxidation of the oil or reacts with the oxidation products to increase oil dielectric loss.
3.1.2 oxidative aging - exposure of oil to oxygen under certain specified conditions.
