ASTM D6097-2001a(2008)e1 781 Standard Test Method for Relative Resistance to Vented Water-Tree Growth in Solid Dielectric Insulating Materials《固体介电绝缘材料对应通气孔水柱上升的电阻力的标准试验方法》.pdf
《ASTM D6097-2001a(2008)e1 781 Standard Test Method for Relative Resistance to Vented Water-Tree Growth in Solid Dielectric Insulating Materials《固体介电绝缘材料对应通气孔水柱上升的电阻力的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D6097-2001a(2008)e1 781 Standard Test Method for Relative Resistance to Vented Water-Tree Growth in Solid Dielectric Insulating Materials《固体介电绝缘材料对应通气孔水柱上升的电阻力的标准试验方法》.pdf(8页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 6097 01a (Reapproved 2008)e1An American National StandardStandard Test Method forRelative Resistance to Vented Water-Tree Growth in SolidDielectric Insulating Materials1This standard is issued under the fixed designation D 6097; the number immediately following the designation indicat
2、es the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.e1NOTEThe units statement in subsection 1.2 was corrected
3、 and the warning in old Note 2 was moved into the text of 8.2editorially in July 2008.1. Scope1.1 This test method covers the relative resistance to ventedwater-tree growth in solid translucent thermoplastic or cross-linked electrical insulating materials. This test method isespecially applicable to
4、 extruded polymeric insulation materi-als used in medium-voltage cables.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use
5、. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitation prior to use. For specific hazardstatements see 8.1.1.4 There is no similar or equivalent IEC standard.2. Referenced Documents2.1 AST
6、M Standards:2D 1898 Practice for Sampling of Plastics3D 1928 Practice for Preparation of Compression-MoldedPolyethylene Test Sheets and Test Specimens3D 2275 Test Method for Voltage Endurance of Solid Elec-trical Insulating Materials Subjected to Partial Discharges(Corona) on the SurfaceD 3756 Test
7、Method for Evaluation of Resistance to Elec-trical Breakdown by Treeing in Solid Dielectric MaterialsUsing Diverging Fields3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 water tree length (WTL), nthe maximum length of astained tree-like micro-channel path in millimetres, meas
8、uredfrom the tip of the conical defect in the direction of the conicalaxis.3.1.2 resistance to water-tree growth (RWTG) a dimen-sionless value which is L divided by the WTL.3.1.3 thickness of point-to-plane specimen (L), nthe ver-tical distance in millimetres from the tip of the conical defectto the
9、 opposite surface of the solid dielectric material.4. Summary of Test Method4.1 Ten compression-molded disk specimens, each contain-ing a conical-shaped defect, are subjected to an applied voltageof 5 kV at 1 kHz and 23 6 2C in an aqueous conductivesolution of 1.0 N NaCl for 30 days. This controlled
10、 conicaldefect is created by a sharp needle with an included angle of60 and a tip radius of 3 m. The electrical stress at the defecttip is enhanced and can be estimated by the Masons Hyper-bolic point-to-plane stress enhancement equation.4This en-hanced electrical stress initiates the formation of a
11、 ventedwater-tree grown from the defect tip. Each treed specimen isstained and sliced. The water-tree length and point-to-planespecimen thickness measured under microscope are used tocalculate a ratio that is defined as the resistance to water-treegrowth.5. Significance and Use5.1 This is a laborato
12、ry test designed to simulate the growthof vented water-trees in the solid dielectric insulating materialinitiated by a sharp protrusion at the insulating and conductiveinterface under a wet environment in a high electrical field.Water-treeing is the phenomenon which describes the appear-ance of tree
13、-like growth in organic dielectrics under an ac fieldwhen exposed to moist environments. Two types of water-trees1This test method is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.12 on Electrical Tes
14、ts.Current edition approved May 1, 2008. Published July 2008. Originally approvedin 1997. Last previous edition approved in 2001 as D 6097 01a.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards vo
15、lume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn.4The sole source of supply of the base, Dow Corning 3110RTV, the catalyst,Dow Corning RTV Catalyst S, and the sealant, Dow Corning Multipurpose SiliconeSealant 732, known to the committee at this time is Dow
16、 Corning, Inc., Midland, MI48686. If you are aware of alternative suppliers, please provide this information toASTM International Headquarters. Your comments will receive careful consider-ation at a meeting of the responsible technical committe, which you may attend.1Copyright ASTM International, 10
17、0 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.are formed. Bow tie trees (within the dielectric) and ventedwater-trees formed from conductive/insulating material inter-face into the insulating material. The water-trees referred to inthis test method are the vented
18、type. The insulating material isthe solid dielectric organic material. The conductive material isthe salt solution. This salt solution is used on both sides of theinsulating material to simulate the same inner and outersemiconductive shields saturated with moisture between theinsulation layer used i
19、n a medium-voltage underground powercable.5.2 This test method provides comparative data. The degreeof correlation with the performance in service has not beenestablished.5.3 The standard test conditions are designed to grow asufficient water-tree length for most solid dielectric insulatingmaterials
20、 of interest before electrical breakdown occurs. Ma-terials with a very high resistance to water-tree growth mayrequire a longer time under test conditions (such as 180 days)or higher voltage (such as 10 or 15 kV) in order to differentiatetheir performance. For materials with a very low resistance t
21、owater-tree growth, electrical breakdown may occur during the30-day testing time. A shorter testing time (such as one or tendays) is recommended to prevent electrical breakdown duringtesting for those low water-tree resistant materials.5.4 Other voltages, frequencies, temperatures, aqueous so-lution
22、s, and defects can be used to evaluate specific materialsfor specific applications. Temperatures should not exceed thesoftening or melting point of the material or 10 to 15C belowthe boiling point of the salt solution. Any nonstandard condi-tions should be reported along with the results.5.5 Tree-gr
23、owth rates generally increase with the test fre-quency. An acceleration factor due to frequency is given by(f/60)kwhere f is the test frequency and k is between 0.6 and0.7. The test frequency of 1 kHz is selected to accelerate thewater-tree growth. However, the chemical nature of oxidizedproducts fr
24、om water-treeing may be different at differentfrequency ranges.5.6 Two assumptions for this test method are: (1) all testedmaterials grow trees in the same power law kinetic manner and(2) the time under test conditions of 30 days is long enough toestablish the difference in water-tree growth. If the
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
5000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTMD60972001A2008E1781STANDARDTESTMETHODFORRELATIVERESISTANCETOVENTEDWATERTREEGROWTHINSOLIDDIELECTRICINSULATINGMATERIALS

链接地址:http://www.mydoc123.com/p-521525.html