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Significance and Use
Certain synthetic dielectric fluids are used in the manufacture of capacitors because of their chemical, thermal, and electrical properties as well as their environmental acceptability.
Properties of a synthetic dielectric fluid differ from those of petroleum based fluids. Design considerations and quality control are influenced by these properties as measured by the appropriate tests.
Each test method has its own brief statement describing its significance.
1.1 These test methods cover testing synthetic dielectric fluids currently in use for capacitors. The methods are generally suitable for specification acceptance, factory control, referee testing, and research. Their applicability to future fluids has not been determined.
1.2 The scope of some of the test methods listed here apply to petroleum oils, but have been found suitable for synthetic fluids.
1.3 For methods relating to polybutene fluids refer to Specification D 2296.
1.4 For methods relating to silicone fluids refer to Test Methods D 2225.
1.5 A list of properties and standards are as follows:
This standard does not purport to address all of the safety problems, 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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D92 Test Method for Flash and Fire Points by Cleveland Open Cup Tester
D97 Test Method for Pour Point of Petroleum Products
D445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)
D664 Test Method for Acid Number of Petroleum Products by Potentiometric Titration
D877 Test Method for Dielectric Breakdown Voltage of Insulating Liquids Using Disk Electrodes
D923 Practices for Sampling Electrical Insulating Liquids
D924 Test Method for Dissipation Factor (or Power Factor) and Relative Permittivity (Dielectric Constant) of Electrical Insulating Liquids
D1218 Test Method for Refractive Index and Refractive Dispersion of Hydrocarbon Liquids
D1298 Test Method for Density, Relative Density (Specific Gravity), or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method
D1533 Test Method for Water in Insulating Liquids by Coulometric Karl Fischer Titration
D1816 Test Method for Dielectric Breakdown Voltage of Insulating Oils of Petroleum Origin Using VDE Electrodes
D1903 Practice for Determining the Coefficient of Thermal Expansion of Electrical Insulating Liquids of Petroleum Origin, and Askarels
D2225 Test Methods for Silicone Fluids Used for Electrical Insulation
D2296 Specification for Continuity of Quality of Electrical Insulating Polybutene Oil for Capacitors
D2864 Terminology Relating to Electrical Insulating Liquids and Gases
ICS Number Code 29.040.10 (Insulating oils)
UNSPSC Code 32121511(Oil capacitor)
ASTM D3809-01(2006), Standard Test Methods for Synthetic Dielectric Fluids For Capacitors, ASTM International, West Conshohocken, PA, 2006, www.astm.orgBack to Top