1、Designation:D 3809 01Standard Test Methods forSynthetic Dielectric Fluids For Capacitors1This standard is issued under the fixed designation D 3809;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in
2、 parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 These test methods cover testing synthetic dielectricfluids currently in use for capacitors.The methods are gener-ally suitable for specification a
3、cceptance,factory control,referee testing,and research.Their applicability to future fluidshas not been determined.1.2 The scope of some of the test methods listed here applyto petroleum oils,but have been found suitable for syntheticfluids.1.3 For methods relating to polybutene fluids refer toSpeci
4、fication D 2296.1.4 For methods relating to silicone fluids refer to TestMethods D 2225.1.5 A list of properties and standards are as follows:Property MeasuredSectionASTM Test MethodPhysical:Coefficient of thermal expansion6D 1903Flash point7D 92Pour point8D 97Refractive index9D 1218Relative Density
5、/Specific gravity10D 1298Viscosity11D 445Chemical:Acid number12D 664Water content13D 1533Electrical:Relative permittivity14D 924Dielectric strength15D 877D 1816Dissipation factor16D 9241.6 This standard does not purport to address all of thesafety problems,if any,associated with its use.It is theres
6、ponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:D 92 Test Method for Flash and Fire Points by ClevelandOpen Cup2D 97 Test Method for Pour Po
7、int of Petroleum Products2D 445 Test Method for Kinematic Viscosity of Transparentand Opaque Liquids(and the Calculation of DynamicViscosity)2D 664 Test Method forAcid Number of Petroleum Productsby Potentiometric Titration2D 877 Test Method for Dielectric Breakdown Voltage ofInsulating Liquids Usin
8、g Disk Electrodes3D 923 Practice for Sampling Electrical Insulating Liquids3D 924 Test Method for Dissipation Factor(or Power Factor)and Relative Permittivity(Dielectric Constant)of Electri-cal Insulating Liquids3D 1218 Test Method for Refractive Index and RefractiveDispersion of Hydrocarbon Liquids
9、2D 1298 Practice for Density,Relative Density(SpecificGravity),or API Gravity of Crude Petroleum and LiquidPetroleum Products by Hydrometer Method2D 1533 Test Methods for Water in Insulating Liquids(KarlFischer Reaction Method)3D 1807 Test Methods for Refractive Index and SpecificOptical Dispersion
10、of Electrical Insulating Liquids3D 1816 Test Methods for Dielectric Breakdown Voltage ofInsulating Oils of Petroleum Origin Using VDE ELec-trodes3D 1903 Test Method for Coefficient of Thermal Expansionof Electrical Insulating Liquids of Petroleum Origin,andAskarels3D 2225 Test Methods for Silicone F
11、luids Used for ElectricalInsulation3D 2296 Specification for Continuity of Quality of ElectricalInsulating Polybutene Oil for Capacitors3D 2864 Terminology Relating to Electrical Insulating Liq-uids and Gases3D 4652 Specification for Silicone Fluid Used for ElectricalInsulation33.Terminology3.1 Defi
12、nitions:3.1.1 coeffcient of thermal expansionthe increase in vol-ume per unit volume per degree change in temperature.It iscommonly stated as the average coefficient over a giventemperature range.3.1.2 total acid numberthe quantity of base,expressed inmilligrams of potassium hydroxide(KOH)that is re
13、quired totitrate all acidic constituents present in 1 g of sample.1These methods are under the jurisdiction of ASTM Committee D27 onElectrical Insulating Liquids and Gasesand are the direct responsibility of Subcom-mittee D27.02on Gases and Synthetic Liquids.Current edition approved April 10,2001.Pu
14、blished June 2001.Originallypublished as D 3809-79.Last previous edition D 380979.2Annual Book of ASTM Standards,Vol 05.01.3Annual Book of ASTM Standards,Vol 10.03.1Copyright ASTM,100 Barr Harbor Drive,West Conshohocken,PA 19428-2959,United States.3.2 For additional terms refer to Terminology D 2864
15、.4.Significance and Use4.1 Certain synthetic dielectric fluids are used in the manu-facture of capacitors because of their chemical,thermal,andelectrical properties as well as their environmental acceptabil-ity.4.2 Properties of a synthetic dielectric fluid differ from thoseof petroleum based fluids
16、.Design considerations and qualitycontrol are influenced by these properties as measured by theappropriate tests.4.3 Each test method has its own brief statement describingits significance.5.Sampling Procedures5.1 Accurate sampling,whether of the complete contents oronly parts thereof,is extremely important from the standpointof evaluation of the quality of the product sampled.Obviously,examination of a sample that,because of careless samplingprocedure or contamination in the sampling equipment,
