ASTM D 117:2022

1.1 This guide describes methods of testing and specifications for electrical insulating liquids intended for use in electrical cables, transformers, liquid-filled circuit breakers, and other electrical apparatus where the liquids are used as insulating, or heat transfer media, or both. 1.2 The purpose of this guide is to outline the applicability of the available test methods. Where more than one is available for measuring a given property, their relative advantages are described, along with an indication of laboratory convenience, precision, (95 % confidence limits), and applicability to specific types of electrical insulating liquids. 1.3 This guide is classified into the following categories: Sampling Practices, Physical Tests, Electrical Tests, Chemical Tests, and Specifications. Within each test category, the test methods are listed alphabetically by property measured. A list of standards follows: Category Section ASTM Standard Sampling: 3 D923 Physical Tests: Aniline Point 4 D611 Coefficient of Thermal Ex- pansion 5 D1903 Color 6 D1500 Examination: Visual Infrared 7 D1524 , D2144 , D2129 Flash and Fire Point 8 D92 Interfacial Tension 9 D971 Pour Point of Petroleum Products 10 D97 , D5949 , D5950 Particle Count in Mineral Insulating Oil 11 D6786 Refractive Index and Specific Optical Dispersion 12 D1218 Relative Density (Specific Gravity) 13 D287 , D1217 , D1298 , D1481 , D4052 Specific Heat 14 D2766 Thermal Conductivity 15 D2717 Viscosity 16 D445 , D2161 , D7042 Electrical Tests: Dielectric Breakdown Voltage 17 D877 , D1816 , D3300 Dissipation Factor and Rela- tive Permittivity (Dielectric Constant) 18 D924 Gassing Characteristic Under Thermal Stress 19 D7150 Gassing Tendency 20 D2300 Resistivity 21 D1169 Chemical Tests: Acidity, Approximate 22 D1534 Carbon-Type Composition 23 D2140 Compatibility with Construc- tion Material 24 D3455 Copper Content 25 D3635 Elements by Inductively Coupled Plasma (ICP-AES) 26 D7151 Furanic Compounds in Electrical Insulating Liquids 27 D5837 Dissolved Gas Analysis ...

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