1、Designation: B978/B978M 14Standard Specification forConcentric-Lay-Stranded Aluminum Conductors, CompositeReinforced (ACCR)1This standard is issued under the fixed designation B978/B978M; the number immediately following the designation indicates the yearof original adoption or, in the case of revis
2、ion, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers concentric-lay-stranded con-ductors made from round aluminum-zirconium allo
3、y wires andan aluminum matrix composite (AMC) core wire(s) for use asoverhead electrical conductors (Explanatory Note 1 and Ex-planatory Note 2).1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equ
4、ivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.2. Referenced Documents2.1 The following documents form a part of this specifica-tion to the extent referenced herein:2.2 ASTM Standards:2B263
5、 Test Method for Determination of Cross-SectionalArea of Stranded ConductorsB354 Terminology Relating to Uninsulated Metallic Electri-cal ConductorsB682 Specification for Metric Sizes of Electrical ConductorsB941 Specification for Heat Resistant Aluminum-ZirconiumAlloy Wire for Electrical PurposesB9
6、76 Specification for Fiber Reinforced Aluminum MatrixComposite (AMC) Core Wire for Aluminum Conductors,Composite Reinforced (ACCR)E29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.3 NIST Document:3NBS Handbook 100 Copper Wire Tables2.4 Aluminum Assoc
7、iation Documents:4Publication 50 Code Words for Overhead Aluminum Elec-trical ConductorsAluminum Association Guideline A Method of Stress-StrainTesting of Aluminum Conductors and ACSR and a TestMethod for Determining the Long Time Creep of Alumi-num Conductors in Overhead Lines3. Terminology3.1 Acro
8、nyms:3.1.1 ACCRaluminum conductor, composite reinforced3.1.2 AMCaluminum matrix composite3.1.3 Al-Zraluminum zirconium4. Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity of each size, stranding, and class,4.1.2 Conductor size,
9、 area (Section 8 and Table 1 and Table2),4.1.3 Number of wires, aluminum-zirconium alloy andAMC (see Table 1 and Table 2),4.1.4 Type of AMC core wires (see 5.3),4.1.5 Direction of lay of outer layer of aluminum-zirconiumalloy wires if other than right-hand (see 7.2),4.1.6 Special tension test, if de
10、sired (see 14.3),4.1.7 Place of inspection (Section 16),4.1.8 Package size and type (see 17.1),4.1.9 Heavy wood lagging, if required (see 17.3), and4.1.10 Special package marking, if required (see 17.4).5. Requirement for Wires5.1 Tests for mechanical and electrical properties ofaluminum-zirconium a
11、lloy and core wires shall be made beforestranding.5.2 Before stranding, the aluminum-zirconium alloy wireused shall meet the requirements of Specification B941.1This specification is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommittee
12、 B01.07 onConductors of Light Metals.Current edition approved April 1, 2014. Published April 2014. DOI: 10.1520/B0978_B0978M-14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume informatio
13、n, refer to the standards Document Summary page onthe ASTM website.3Available from National Institute of Standards and Technology (NIST), 100Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http:/www.nist.gov.4Available from Aluminum Association, Inc., 1525 Wilson Blvd., Suite 600,Arlington, VA 2
14、2209, http:/www.aluminum.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.3 Before stranding, theAMC core wire used shall meet therequirements of Specification B976.6. Joints6.1 Electric-butt welds, cold-pressure welds, and elect
15、ric-butt, cold-upset welds in the finished individual aluminum-zirconium alloy wires composing the conductor may be madeduring the stranding process. No weld shall occur within 50 ft15 m of any weld in the completed conductor (ExplanatoryNote 3).6.2 There shall be no joints of any kind made in the f
16、inishedAMC core wires.7. Lay7.1 The length of lay of the various layers of wires in aconductor shall conform to Table 3 (see Explanatory Note 4).These are expressed in values of lay ratio.7.2 The direction of lay of the outside layer of aluminum-zirconium alloy wires shall be right hand unless other
17、wisespecified in the purchase order. The direction of lay of thealuminum-zirconium alloy wires shall be reversed in succes-sive layers.7.3 The direction of lay of the core wires shall preferably beunidirectional in successive layers. Use of core wires reversedTABLE 1 Construction Requirements of Alu
18、minum Conductors, Composite Reinforced (ACCR)DesignationNominal,kcmilStranding,Aluminum-ZirconiumAlloy/AMCRatedStrength,lbCross Sectional Area,in.2Layers ofAluminum-ZirconiumAlloyDiameterTotalMass(lb)/1000 ftIndividual WiresAMCCore,in.CompleteCable,in.Aluminum-ZirconiumAlloy TotalAluminum-ZirconiumA
19、lloy,in.AMC,in.300-T16 297 26/7 12100 0.233 0.271 2 0.107 0.083 0.249 0.677 337336-T16 340 26/7 13900 0.267 0.310 2 0.114 0.089 0.267 0.724 385477-T16 470 26/7 19200 0.369 0.429 2 0.134 0.105 0.314 0.852 533557-T16 573 26/7 23100 0.450 0.524 2 0.149 0.116 0.347 0.941 650636-T16 656 26/19 25600 0.516
20、 0.598 2 0.159 0.074 0.371 1.006 740795-T16 824 26/19 32200 0.648 0.751 2 0.178 0.083 0.416 1.128 930954-T13 967 54/19 33200 0.760 0.856 3 0.134 0.080 0.402 1.205 10591033-T13 1036 54/19 35600 0.814 0.917 3 0.139 0.083 0.416 1.247 11341272-T11 1236 51/19 38500 0.972 1.075 3 0.156 0.083 0.416 1.350 1
21、.3251351-T13 1334 54/19 45300 1.048 1.180 3 0.157 0.094 0.472 1.415 14601590-T11 1594 51/19 49500 1.252 1.385 3 0.094 0.177 0.472 1.532 1.706Conversion factors:1cmil=5.067E4.0mm21in.=2.54E+01mm1lb/1000 ft = 1.488E+00kg/km1ft=3.048E01m1lb=4.536E01kg1 lbf = 4.448 NTABLE 2 Construction Requirements of
22、Aluminum Conductors, Composite Reinforced (ACCR) MetricDesignationNominal,mm2StrandingAluminum-ZirconiumAlloy/AMCRatedStrength,kNCross Sectional Area,mm2Layers ofAluminum-ZirconiumAlloyDiameterTotalMasskg/mIndividual WiresAMCCore,mmCompleteCable,mmAluminum-ZirconiumAlloy TotalAluminum-ZirconiumAlloy
23、,mmAMC,mm300-T16 150 26/7 53.8 150 175 2 2.7 2.1 6.3 17.2 0.501336-T16 172 26/7 61.8 172 200 2 2.9 2.3 6.8 18.4 0.573477-T16 238 26/7 85.4 238 277 2 3.4 2.7 8.0 21.6 0.793556-T16 291 26/7 102.8 291 338 2 3.8 2.9 8.8 23.9 0.967636-T16 333 26/19 113.9 332 385 2 4.0 1.9 9.4 25.5 1.101795-T16 418 26/19
24、143.2 418 484 2 4.5 2.1 10.6 28.6 1.384954-T13 490 54/19 147.7 490 552 3 3.4 2.0 10.2 30.6 1.5761033-T13 525 54/19 158.4 525 591 3 3.5 2.1 10.6 31.7 1.6871272-T11 627 51/19 171.3 627 694 3 4.0 2.1 10.6 34.3 1.9721351-T13 676 54/19 201.5 676 761 3 4.0 2.4 12.0 35.9 2.1721590-T11 806 51/19 220.2 808 8
25、94 3 4.5 2.4 12.0 38.9 2.539Conversion factors:1cmil=5.067E4.0mm21in.=2.54E+01mm1 lb/1000 ft = 1.488E+00kg/km1ft=3.048E01m1lb=4.536E01kg1 lbf = 4.448 NB978/B978M 142TABLE3LayFactorsforAluminumConductors,Composite-Reinforced,Concentric-Lay-StrandedStanding ClassStrandingRatioofLengthofLayofaLayertoNo
26、minalOutsideDiameterofThatLayerAluminum-ZirconiumAlloyWireLayersAMCLayersFirst(Outside)SecondThird12Wire6WireMinPreferredMaxMinPreferredMaxMinPreferredMaxMinPreferredMaxMinPreferredMaxAA26/71011.51310131658668026/191011.51310131658668058668054/191011.5131013161013.517586680586680B978/B978M 143in suc
27、cessive layers may be acceptable upon agreement be-tween the supplier and the purchaser.7.4 The direction of lay of the inner Al-Zr alloy wires maybe either unidirectional or reversed relative to the direction oflay of the outside layer of the core wires.8. Construction8.1 The number and diameter of
28、 aluminum-zirconium alloyand AMC wires and the area of cross section of aluminum-zirconium alloy wires shall conform to the requirementsprescribed in Table 1 and Table 2.9. Rated Strength of Conductor9.1 The rated strength of a completed conductor shall betaken as the sum of the aluminum-zirconium a
29、lloy load ratingand the AMC load rating, calculated as follows.9.1.1 The strength contribution of the aluminum alloy wiresshall be taken as:Aluminum zirconium alloy load = min wire strength3 nominal wire area!30.967! 3 number strands3stranding derating factor(See Explanatory Note 5) for more informa
30、tion.)9.1.2 The minimum aluminum-zirconium alloy wirestrength and nominal diameter may be obtained from Specifi-cation B941. The number of strands is found in Table 1 andTable 2, and the stranding derating factor is found in Table 4.The strength contribution of theAMC core wires shall be takenas:Cor
31、e load = min wire load 3number strands 3stranding factor9.1.3 The minimum core wire strength may be obtainedfrom Specification B976. The number of strands is found inTable 1 and Table 2, and the stranding factor is found in Table4.9.2 Rated strengths of various constructions are given inTable 1 and
32、Table 2.10. Density10.1 For the purpose of calculating mass per unit length,cross sections, etc., the density of the aluminum-zirconiumalloy shall be taken as 2698 kg/m30.0975 lb/in.3 at 20C.10.2 For the purpose of calculating mass per unit length,cross sections, etc., the density of the AMC wire sh
33、all be takenas 3370 kg/m30.122 lb/in.3 at 20C.11. Mass Per Unit Length and Electrical Resistance11.1 The mass per unit length and electrical resistance of aunit length of stranded conductor are a function of the length oflay. The approximate mass and electrical resistance may bedetermined using the
34、standard increments shown in Table 4.When greater accuracy is desired the increment based on thespecific lay of the conductor may be calculated (ExplanatoryNote 6).11.2 In the calculation of the electrical resistance of aconductor, theAMC core wires may be included. The electricalresistance of the A
35、MC core wires shall be taken as 39.88cmil/ft 0.0642 mm2/m at 68F 20C. The electricalresistance of aluminum-zirconium wires shall be taken as17.28 cmil/ft 0.02873 mm2/m at 68F 20C. These aretypical DC resistance values, not minimum values.12. Cross-sectional Area12.1 The area of cross section of the
36、aluminum-zirconiumalloy wires of a conductor shall be not less than 98 % of thearea specified. Unless otherwise specified by the purchaser, themanufacturer may have the option of determining the cross-sectional area by either of the following methods, except that incase of question regarding area co
37、mpliance, the method of12.1.2 shall be used:12.1.1 The area of cross section may be determined bycalculations from diameter measurements, expressed to fourdecimal places for inches or three decimal places formillimeters, of the component aluminum-zirconium alloywires at any point when measured perpe
38、ndicularly to theiraxes.12.1.2 The area of cross section of the aluminum-zirconiumalloy wires of a conductor may be determined by Test MethodB263. In applying that test method the increment in mass perunit length resulting from stranding may be the applicablevalue specified in 11.1 or may be calcula
39、ted from the measuredcomponent dimensions of the sample under test. In case ofquestions regarding area compliance, the actual mass per unitlength increment due to stranding shall be calculated.13. Workmanship, Finish, and Appearance13.1 The conductor shall be clean and free of imperfectionsnot consi
40、stent with good commercial practice.14. Mechanical, Electrical and Dimensional Tests14.1 Classification of Tests:14.1.1 Type TestsType tests are intended to verify themain characteristics of a conductor which depend mainly on itsdesign. They are carried out once for a new design ormanufacturing proc
41、ess of conductor and then subsequentlyrepeated only when the design or manufacturing process ischanged.14.1.2 Production Sample TestsProduction sample testsare intended to guarantee the quality of conductors andcompliance with the requirements of this standard.14.2 Type Test Requirements:14.2.1 Type
42、 tests require measurement of (a) the breakingstrength of the conductor, and (b) measurement of the stress-strain curves.TABLE 4 Standard Increments and Rating Factors for Mass PerUnit Length, Resistivity, and Rated Strength DeterminationStrandingDesignAluminum-ZirconiumAlloy/AMCStandard Increments
43、Due toStranding (for mass per unitlength and resistivity) IncreaseStranding Derating Factors(for rated strength)Aluminum-ZirconiumAlloy (%) Core (%)Aluminum-ZirconiumAlloy (%) Core (%)Round Wires26/7 2.5 0 93 9626/19 2.5 0 93 9254/19 3.0 0 91 92B978/B978M 14414.2.1.1 The breaking load of the conduct
44、or may be mea-sured by terminating a length of conductor at least 2.5 m 9.5ft in length with suitable termination fittings. The conductor isplaced in a tensile test frame and loaded with a steadilyincreasing load until failure occurs. The test should be per-formed at a rate of 1 % strain per minute
45、(typically less than 2minutes per test). The breaking load should be recorded. Iffailure of the specimen occurs within 150 mm 6 in. of the endterminations, and if the failure load does not exceed the ratedstrength of the specimen, then the test result may be discardedand the test should be repeated
46、with a new specimen.14.2.1.2 The stress-strain measurements should follow thetest procedure in the Aluminum Association Guideline, “AMethod of Stress-Strain Testing of Aluminum Conductors andACSR and A Test Method for Determining the Long TimeCreep of Aluminum Conductors in Overhead Lines.”14.3 Prod
47、uction Sample Test Requirements:14.3.1 Tests for all properties of aluminum-zirconium alloywires shall be made before stranding (Explanatory Note 7).14.3.2 Tests on aluminum-zirconium alloy wires shouldfollow the requirements of Specification B941. These requiremeasurement of diameter, electrical re
48、sistivity, tensile strength,tensile elongation, heat resistance (only the 280C/1 hr test isrequired), and wrapping.14.3.3 Tests for all properties of AMC wires shall be madebefore stranding (Explanatory Note 7).14.3.4 Tests on AMC wires should follow the requirementsof Specification B976. This requi
49、res measurement of diameter,electrical resistivity, and tensile breaking load.14.3.5 Routine production testing of wires after stranding isnot required. However, when such tests are requested by thepurchaser and agreed to by the manufacturer at the time ofplacing the order (or made for other reasons) aluminum-zirconium alloy and AMC wires removed from the completedconductor shall have tensile strengths of not less than 95 % ofthe minimum tensile strength specified for the wire beforestranding. The electrical resistivity s
