【AS澳大利亚标准】AS 1222-2-1992 Steel conductors and stays— Bare overhead Part 2 Aluminium clad (SCAC).doc

as 1222.21992australian standardsteel conductors and stays bare overheadpart 2: aluminium clad (sc/ac)this australian s tandard was prepared by commit tee el/ 10, overhead li nes. it was approved on behalf of the council of st andards australia on 21 july 1992 and publi shed on 12 october 1992.the foll owing interests are represented on commit tee el/ 10: australi an electrical and electronic manufacturers association australi an p orcelain insulators associationconfederation of australi an industryel ectricit y supply associati on of australi arailways of australia commit teereview of australian st andards. to keep abreast of progress i n industry, australian standards are subject to periodic review and are kept up t o date by t he issue of amendments or new edit ions as necessary. i t i s im portant t herefore t hat standards users ensure t hat t hey are i n possession of t he latest edit ion, and any amendments thereto.full details of all australi an standards and related publi cati ons wil l be f ound i n t he standards australia catalogue of publications; t his information i s supplemented each month by the magazine the australian standard, which subscribing members receive, and which gives detail s of new publi cati ons, new edit ions and amendments, and of wi thdrawn standards.suggesti ons for i mprovements t o australi an standards, addressed t o the head off ice of standards australi a, are welcomed. notif ication of any inaccuracy or ambiguit y found in an australi an standard should be made wi thout delay in order that the matter may be investigated and appropriate action taken.this standard was issued in draft form for comment as dr 91133.as 1222.21992australian standardsteel conductors and stays bare overheadpart 2: aluminium clad (sc/ac)fi rst publi shed as as 1222.2 1973. second editi on 1992.publi shed by standards australia (standards association of austral ia)1 the crescent, homebush, nsw 2140is bn 0 7262 7727 4prefa cethis st andard was prepared by the s tandards australia commit tee on overhead lines to supersede as 1222.2 1973, steel conductors and stays for overhead power transmission purposes, part 2: al uminium clad (sc/ ac ), and it is the second part of a two-part series, viz.as 1222 steel conductors and stays bare overheadpart 1:galvanized (sc/ gz)part 2:al uminium clad (sc/ ac )the s tandard conforms generally with various internati onal electrotechnical commission (iec)publi cations on overhead conductors and with ie c draft, document 7 (central office) 434.in determining conductor sizes, a range of wire sizes has been provided similar to that for conductors specified in the 1973 edit ion. conductors wit h other dimensions can also be supplied by reference to this st andard.wi re sizes have not been changed from the previous editi on but major modifications have been made in the foll owing areas:(a) the provisions allowing joining of finished wires has been eliminated.(b) the sampling rate of specimens for routi ne tests relies on a quali ty assurance plan.(c) a new appendix b covers the coefficient of linear expansion and the theoreti cal basis for the calculation of modulus of elasticity.(d) a new appendix c has been included which highlights it ems to be specified by the purchaser or agreed between purchaser and manufacturer at the time of order. copyri ghtstandards australi auser s of standar ds are r eminded that copyri ght subsists i n all st andard s austra li a publications and soft ware . except wher e the copyri ght act all ows and except where pr ovided fo r below no publications or sof tw ar e pro duced by standar ds austr alia may be re pr oduced, stor ed i n a r etri eval system in any f or m or t ra nsmi tt ed by any means wi thout pri or perm ission i n wri ti ng fr om st andard s austra li a. per mi ssion may be conditi onal on an appro pr iate ro yalt y payment. requests f or per mi ssion and info rm ation on comm er cial soft ware r oyalti es should be dir ected to the head off ice of st andard s austra li a.st andard s austra li a wil l per mi t up t o 10 per cent of the technical content pages of a st andard to be copied fo r use exclusively i n- house by purc hasers of the st andard wi thout payment of a r oyalty or advice t o st andard s austr alia.st andard s austra li a wil l also per mi t t he inclusion of i ts copyri ght mater ial i n computer soft ware pr ogra ms f or no ro yalt y payment pr ovided such pr ogra ms ar e used exclusively in-h ouse by the cre ator s of t he pro gr ams.care should be taken to ensure that mater ial used i s fr om t he cur re nt editi on of t he standar d and that it i s updated whenever t hest andard i s amended or r evised. the number and date of t he st andard should t here fo re be clear ly i dentif ied.the use of mater ial in pri nt f or m or in computer soft ware pr ogra ms to be used comm er cially, wi th or wi thout payment, or i n comm er cial contra cts is subject to the payment of a r oyalty. this policy may be vari ed by st andard s austr alia at any ti me.15as 1222.21992con ten tspagese cti on 1 s cop e and general1.1 sc ope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41.2 re f er enced documents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41.3 def initi ons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41.4 nomenclature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5se cti on 2 material require ments and wi re p rop er tie s2.1 gener al . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.2 mater ials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.3 wi re pr op ert ies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6se cti on 3 conductor requirements3.1 gener al . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83.2 joints in f inis hed w ires. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83.3 lay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83.4 st andard si ze s and calc ulate d p rop er ti es of conduct ors . . . . . . . . 8se cti on 4 tes ts4.1se lec tion of te s t s pe cimens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104.2mechanical test s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .104.3coati ng thicknes s tes t. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114.4re s is tivit y test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114.5lay ratio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114.6pl ace of test ing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11se cti on 5 p acking and marking5.1 pa cking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125.2 marking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125.3 coil marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125.4 ce rti f icate of compl iance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12ap p endicesacalculation of conduct or p rop er ti es . . . . . . . . . . . . . . . . . . . . . . . . . . 13bcoeff icient of li near exp ans ion and calculation of modulusof elas ticit y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14cpu rchasi ng guideli nes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15stand ard s australiaaustralian standardste el conductors and stays ba re overheadpart 2: aluminium clad (sc/ac)sectio n 1 scope a nd ge n era l1.1 sc ope this s tandard specifies requirements and tests for bare electrical conductors for overhead power transmission purposes, constructed from aluminium-clad steel wires, having a minimum aluminium radial thickness of 5% of the nominal diameter of the wire. this corresponds to iec class 20sa type a of aluminium-clad steel wires.for the purpose of this s tandard, the term conductor includes stays.notes:1 appendix a gives methods to calculate conductor pro pert ies.2 appendix b gives the coeff icient of l inear expansion and the t heor etical basis f or the calculati on of modulus of elasti city.3 appendix c li sts info rm ation which should be supplied wi th enquir ies and or ders f or conductor s.1.2 refe renced documents the following documents are referred to in this st andard: as1057quali ty assurance and qualit y control glossary of terms1391methods of tensil e testing of metals1442carbon steels and carbon-manganese steels hot-roll ed bars and semi-finished products2505methods for bend and related testing of metals2505.5part 5: torsion and wrapping tests on wire2848aluminium and aluminium alloys compositi ons and designations2848.1part 1: w rought products2857ti mber drums for insulated electric cables and bare conductors3983metal drums for insulated electric cables and bare conductorsie c468methods of measurement of resistivit y of metall ic materialsas tmd566test method for dropping point of lubricating grease1.3 definitions f or the purpose of this s tandard, the definit ions given in as 1057 and those below apply.1.3.1 wire a fil ament of drawn metal having a constant circular cross section.1.3.2 king wire a central wire of a conductor having a nominal diameter larger than that of the surrounding wires.1.3.3 cond u ctor a finished circular stranded assembly consisting of three or more wires laid up together.1.3.4 diameter the mean of two measurements at right angles taken at any one cross-secti on.1.3.5 direction of lay the directi on of lay is defined as right-hand or left-hand, as follows:(a) ri ght-hand lay when the slope of the wires is in the direction of the central part of the letterz when the conductor is held verticall y.(b) left-hand lay when the slope of the wires is in the direction of the central part of the letters when the conductor is held verticall y.1.3.6 lay len gth the axial length of one complete turn of the heli x formed by an individual wire in a stranded conductor.1.3.7 lay ratio the rati o of the lay length to the nominal external diameter of the corresponding layer of wires in the stranded conductor.1.3.8 break in g load of a wire the maximum load obtained in a tensil e test of wire.1.3.9 ultimate tensil e stress the breaking load divided by the original cross-secti onal area of the test wire.copyri ght1.3.10 non- greased con du ctor a conductor which is dry and free from grease, other than a residue of a manufacturing lubricant which may be on the wires.1.3.11 fu ll y greased cond uctor a conductor in which grease is applied to all wires with the exception of the outermost layer.1.3.12 s u rface fracture a crack on the surface of a wire visible to an observer with normal or corrected vision.1.3.13 spool a container of wire which is to be install ed on a stranding machine to manufacture the conductor.1.3.14 s tatistical con trol where variati on in the output of a process is random and is an inherent part of the system. this condition impli es an absence of special causes of variation.1.3.15 process cap abili ty the limit s of inherent variabil ity within which a process operates as governed by the prevailing circumstances.note: i n pra ctice this var iabili ty i s norm ally t aken t o be six standard deviations.1.4 nome nclature aluminium-clad steel conductors covered by this s tandard shall have the code sc /ac.sectio n 2 mat erial req ui remen ts a n d wire pro perties2.1 general the conductor shall be constructed of aluminium-clad steel wires having the properti es specified in this st andard.if specified, the conductor may contain grease for addit ional protecti on against corrosion.it is not intended that wires from a conductor purporti ng to comply with this st andard should be subjected to chemical analysis.2.2 materials2.2.1 general the wire shall consist of a round steel core with aluminium cladding. the aluminium shall conform to the composit ion requirements of all oy 1350 as specified in as 2848.1.the cladding shall provide a uniform and conti nuous aluminium cladding as described incl auses 2.2.2 and 2.2.3, and shall comply wit h the requirement of clause 2.3.2.2.2 s teel the base metal shall be full y-kil led steel in accordance wit h as 1442.2.2.3 alumini um the aluminium used for cladding shall have a minimum purit y of 99.5% wit h impuriti es limited to (a) copper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.05% maximum; and(b) copper plus sil icon plus iron . . . . . . . . . . . . . . . . . . . . . . . . 0.50% maximum. the coating shall comply with the relevant requirements of clause 4.3.2.2.4 grease grease, used for additional corrosion protecti on, shall have a dropping point of not less than 120c determined in accordance with as tm d566.2.3 wire prope rties2.3.1 general before stranding, all wires shall meet the dimensional tolerances of table 2.1. f or non-standard sizes, the wires shall have a minimum ultimate tensile stress corresponding to that of the next larger standard wire size as specified in table 2.2.joints may be made in the base steel rod and these may be retained in the final wire provided that, at the positi on of the joint, there shall be a minimum aluminium radial thickness of 5% of nominal diameter of the wire. the finished wire shall contain no joints other than those made in the base steel rod.nomi nal diamete rtable 2.1tolerance on diameter of wirestolerance on measurements, wit h refe rence t o nomin al di amet ermax. ovalit y ( di ff erence betw een max. and m in .mmmean di amet erdi amet ers at same cross secti on)%2.751.532.3.2 freed om from d efects the wires shall be smooth and free from all imperfections such as fissures, roughness, grooves, inclusions or other defects which may endanger the performance of the product.2.3.3 alumini um-clad steel wire2.3.3.1 general the required properties and sizes of aluminium-clad steel wire are given intable 2.2.values adopted for the basic properti es of wire for the purpose of this s tandard are set out incl auses 2.3.2.2 to 2.3.2.6.2.3.3.2 densit y the densit y of aluminium-clad steel wire at 20c is taken as 6.59 10 3 kg/m 3.2.3.3.3 resistivity the resistivity of aluminium-clad steel wire varies considerably with chemical composit ion, microstructure, tensile strength, and cladding thickness. maximum value at 20c is taken as 0.085,.m (this corresponds to 20.3% conductivity iacs*).2.3.3.4 constant-mass temperature coeffi cient of resistance ( 20) the constant-mass temperature coefficient of resistance of aluminium-clad steel wire at 20c, measured between two potential points rigidly fixed to the wire, is taken as 3.6 10 -3 per c.2.3.3.5 modulus of elasticit y the modulus of elasticity of aluminium-clad steel wire is taken as162 gp a.* in tern ational annealed copper st andard .2.3.3.6 coeffi cient of li near expansion the coefficient of linear expansion of aluminium-clad steel wire is taken as 12.9 10-6 per c.table 2.2prope rties of aluminium- clad s teel wires12345678maximumst andard di amet erscross-massmi ni mummi ni mumd.c. resistancenomi nalmmmax.mmmi n.mmsect ionalarea*mm 2per km*kgbreaki ngload*knul ti matepte nsil e str essmp aer km at2.752.7912.7095.94039.17.961 34014.33.003.0452.9557.06946.69.471 34012.03.253.2993.2018.29654.711.11 34010.23.753.8063.69411.0472.813.81 2507.704.254.3134.18614.1993.516.71 1805.9820 c* tabulated values are based on t he nomi nal diameters given i n column 1, and ar e given f or info rm ation only.sectio n 3 con du cto r req u irement s3.1 cons truction3.1.1 general the wire used in the construction of alumini