BS 215-1 Aluminum Conductors & Aluminum Conductors Steel-Reinforced for Overhead Power Transmission...

8/2/2019 BS 215-1 Aluminum Conductors & Aluminum Conductors Steel-Reinforced for Overhead Power Transmission (Aluminum Stranded Conductors)

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. .

SPECIFICATION FORALUrvlINlurvl CONDUCTORS -ANDALUMINIUM CONDUCTORS,

STEEL-RE INFO ReEDFOR OVERHEAD POW ER TRANSM ISSION

Part 1. Aluminium stranded conductors

, ..~ .~... '. 1" 't~',"D'~ ~.l~) ; ~""~J-'~ 1 : . .1". / i iJ

. BRITISH. STANDARDS INSTITUTIONIncorporated by Royal Charter

British Standards House, 2 Park Street, London. WIY 4AATelegrams: Standards London WI Telephone: 01-629 9t 'OO

UDC 621.315.55: 669.71I,

I~~!E::I'B 'Y : .


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approved by theCommittee, wasecutive Board on

BS 215: Part 1 : 1970

Co-operating organizationsForeword

Page4 -5

SPECIFICATIONr, GENERAL

2. MATERIAL

6677

1 .1 Scope1.2 Definitions1.3 Standards for hard-drawn aluminium wirethe fact that this

e ~ -iecessarv

he industries con-periodical review.orded and in dueuees charged withrefer.

3. DIMEN3WNS AND CON3TRVC'TICN33. 1 Standard sizes of wires 73.2 Standard sizes of aluminium stranded conductors 7

7J. ~ S t r : : . n u i n _ sJ.3 ());~}p!c:;:dconcuctcrover o c r o ,

of each, wii1which may be

may also be con-in:liitutions.

J

4. 1 Selection o r test samples4.2 Place of testing4.3 Tests

following British9

4.4 Certificate of compliance 9APPENDICES

A. Notes on the calculation of Table 3 12B. Note on modulus of elasticity and coefficient

of linear expansion 13C. Code names for standard aluminium stranded

conductors' 14D. Non-standard constructions 15

engineering.l purposes. Wire.

b y the issue either;. '~alll IIIaIn to; .lIey are in

TABLES1. Lay ratios for aluminium stranded conductors 82. Aluminium wires used in the construction of

standard aluminium stranded conductors 103. Standard aluminium stranded conductors 11

k on this standard:r c ommen t 68/29131

1 2. Stranding constants3


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ards Committee,Standard wasm the followingand industrial

Association' Associationgh Conductivity lad, strations

nobile Division)

s Ltd.

c and industr ialthe above list,represented onof this

neraung Board . .

B S 21 ~ : Part 1 : 19BRITISH 57 ANDARD SPECIFICATION FOR

ALUMINIUr,,1 CONDUCTORS AND ALUMINIUM-CONDUCTORS, STEEL-REINFORCEDFOR OVERHEAD POWER TRANSMISSION

Part 1, Aluminium stranded conductorsFOREWORD

This British Standard was first published as BS 215: Part I in 1956; previouslythe requirements fer :l!~rr:~~!um stranded conductors were included !~g'!!::''!!'with those for steel-cered aluminium conductors, now covered by BS 215: Part 2,in the one ?ubl;c:::(:on.

In this revision all dimensions are included in metric units and therequirements of tr.e stancard have been amended to conform suostanuauv Wl(,1those of JEe Puo.ication 207, ' Aluminium stranded conductors '.

As a result cl:c: are ~ nurncer of cn2.nges in the specuicauon. La y T:H!. ,:::C1:~'. >::~ :!~:." :~:. -.:,'. . :1 ' ',::! : : ; : :~ :1' ~. -" : :; :~ " Jf ~ C0n:?JCt~ ~I,~rn -f n ~ t : ~~",:,!;~,: 1 ;'r--,e xt er na l d iam et er of th e h elix instead of to the mean diameter of the he!i;~ ashitherto. The bas;3:or:1k:.Jiating conductor breaking loads has been artereo.Values of the moduli of elasticity quoted in an appendix are practical valuesobtained by test, wnicn arc considered to be of more practical significance thanthe calfulated values formerly quoted.

In the course of metrication the sizes of standard conductors, of which thenumber has been restricted, have been maintained unchanged except fornegligible differences due to the expression of wire diameters in millimetres.The sizes of conductors are designated by nominal aluminium areas (mm') inplace of the formerly used nominal copper areas (inZ). For convenience thenominal aluminium areas have been taken as being numerically 1000 times theprevious nominal copper areas.

At the present time there is an increasing use of conductors of constructionsother than those covered in this standard. To facilitate standardization of theseconstructions lay ratio limits and the appropriate stranding factors are includedin an appendix.

Detailed requirements for alwninium wires are not included in this standard,but are specified in BS 2627, 'Wrought aluminium for electrical purposes.Wire',

All stresses are quoted in terms of the hectobar (hbar"), I hbar ... 10 MN/rn" - 10 N/mrn.

5


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as 21S : Part 1 : 1970Other British Standards dealing with aluminium conductors for overhead

lines are listed below:BS 215: Aluminium conductors and aluminium conductors, steel-reinforced for overhead power transmission.

Part 2. Aluminium conductors, steel-reinforced.Aluminium alloy stranded conductors for overhead powertransmission.

BS 3242.

SPECiFICATION

Part i ':'1 r...:s British Standard 'De lies to aluminium stranded conductors foroverhead pewer transmission.

1.2 DEFINITIONSFor the purposes of this Part of this British Standard the following definitionsapply:

Stranded conductor. A conductor consisting of seven or more aluminiumwires of the same nominal diameter twisted together in concentric layers. Whenthe conductor consists of more than one layer. successive layers are twisted inopposite directions.

Diameter. The mean of two measure:nents at right angles taken. at thesame cross section.Direction of lay. The direction of lay is defined as right-hand or left-hand.

With right-hand lay, the wires conform to the direction of the central part ofthe letter Z when the conductor is held vertically. With left-hand lay, th~ wiresconform to the direction of the central part of the letter S when the conductoris held vertically.

Lay ratio. The ratio of the axial length of a complete turn of the helixformed by an individual wire in a stranded conductor to the external diameterof the helix.

For other definitions reference should be made to BS 20S.

. .

B S 20S, Gl os s a, Y o f terms used i n e le ct ri ca l c na in ec :r in& '


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..

' .. ,..'.;

inthe

of

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BS 213 : Part I : 19 701.3 STANDARDS FOR HARD-DRAWN ALUMINIUM WIRE

1.3.1 Resistivity. The resistivity of aluminium wire depends upon its purityand its physical condition. For the purposes of this British Standard the maximumvalue permitted is 28264 !J.n cm at 20"C, and this value shall also be used asthe standard resistivity for the purpose of calculation.1.3.2 Density. At rt temperature of 20C the density of hard-drawn aluminiumwire is to be taken as 2703 g/cmJ 1.3.3 Coefficient of linear expansion. The coefficient of linear expansion ofhard-drawn aluminium is to be taken as 23 x to-ere.1.3.4 Constant-mass t em p er at ur e c oe ffic ie nt . At a temperature of 20'C the constant mass' temperature ccctficicnt of resistance ui ;lJ."J-G;aWil aiumii:i:.:..-:wire, measured between two potential points rigidly fixed to the wire, is takenas OC( \ .1 OJ /DC.

T:::: : . ' !11 '~ ;~~;1 '~ ', , :, ; : : , ' _ ; -' ~~ : , ., ; .~~~"n~lrldiono r th -e con duc to r shall be materialG iE in the 1-1:]-CO~1t:~H :cr : [. u : : pc :L~~~jnS:) ~.2617 1: .By agreement ccL"NC Cn L1C pL..:rCn~lS\!r.. .l,U L1e ma.n. .. . .~. ; . . .{ . ;r J. Jui\.~:;:_~ b:::'.-"::''': ; ; - ; _ j ' ! : :c ; : P F ! : : d -~8 ~~-.~':::;.-:~: "/;f.~., ('w "cl,"' :1t~(~~ ~r.nyo ' , ;T r iC3 in s pe cific lay ers ,evenly throughout 1 1 : ; : : :eng~h of the conductor.

3. DIMENSIONS AND CONSTRtJcrlC~3.t STANDARD SIZES OF WIRES

The aluminium wires for the standard constructions covered by this specificationshall have the diameters specified in Table 2.

3.2 STANDARD SIZES OF ALUMINIUM STRANDED CONDUcrORS3.2.1 The sizes of standard aluminium stranded conductors are given in Table 3.3.2.2 The masses (excluding the mass of grease for corrosion protection) andresistances may be taken as being in accordance with Table 3.

3.3 JOINTS IN WIRES3.3.1 Conductors containing seven wires. There shall be no joints in an y wireof a stranded conductor containing seven wires, except those made in the baserod or wire before final drawing.3.3.2 Conductors containing more than seven wires. In stranded conductorscontaining more than seven wires, joints in individual wires are permitted inaddition to those made in the base rod or wire before final drawing, but no two os 2627, Wrought aluminium for electrical purposes. Wire ' ,

7 i'I


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s 215: Part 1 : 3970such joints shall be less than 15 111 apart in the complete stranded conductor.Such joints shall be made by resistance or cold-pressure butt-welding. They arenot required to fulfil the mechanical requirements for unjointed wires. Jointsmade by resistance butt-welding' shall, subsequent to welding, be annealed overa distance of at least 200 mm on each side of the joint.

3.4 STRANDING3.4.1 The wire used in the construction of a stranded conductor shall, beforestranding, satisfy all the relevant requirements of this standard.3.4.2 The lay ratio of the different layers shall be within the limits given inTable I.NOTE. It is important to note that lay ratio is now detlned as the ratio of the axial lengthof a complete turn of the helix formed by an individual wire in a stranded conductor to theexternal diameter of the helix,

,3.4.3 In all consrn.cricns, ~:l~)uc~e.).;L-~1~ i~,,~ 3~:_ :.:: : - ' = ' . , ' . ! C;PCSltz ~5:~~!~c::soi lay, the outermost layer being dgtt-hr.;:.c:c. 'T!:~w ire s : ~ each h~r~rhall beevenly and c!oselj' .) '~ i ' ; : :. . . . :~~d.3.4.4 In aluminium str mded vonductors naving muu.pie rayers 01 wires, w,;lay ratio of


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BS 215: Part 1 : 1910

d conductor.ing. They arewires. Jointsannealed over

4. TESTS4.1 SELECTION OF TEST SAMPLES

.,

4.1.1 Samples for the tests specified in 4.3, shall be taken by the manufacturerbefore stranding. from not less than 10% of the individual lengths of aluminiumwire which will be included in anyone consignment of stranded conductor.

One sample. sufficient to provide one test specimen for each of the appropriatetests, shall be taken from each of the selected lengths of wire.4.1.2 Alternatively. when the purchaser states at the time of ordering that hedesires tests to be made in the presence of his representative, samples of wireshall be taken from lengths of stranded conductor selected rrom approximately1 0 ~ /~of the lengths included in anyone consignment .One sample, sufficient to provide one specimen for each of Ih~ appropriate

tests, shall be taken from eaca or' an agreec ;lL.G~~\:J.v!r'f~.;J v Z ~ : :. . ; ;.c-~c~c!.:rin each of the selected lengths.

shall, before1 in

Lite axial lengthonductor to .i1~

.te {jir:!ciiol.1~"; J . ; e _ ~ . :U 1 1 1 : : ' e;J! wnes, 4~1~imrneciareiy Unless otherwise agreed between the purchaser and the manufacturer at the

time of ordering. all tests shall be made at the manu(.:.cturer's works,

74.3 TESTS

The test samples taken under 4.1.1 shall be subjected. to the following tests inaccordance with BS 2621 and shall meet the requirements of that standard:Tensile test.Wrapping test. .Resistivity test. = ,

Test samples taken under 4.1.2 shall be subjected to the same tests, but inthe case of the tensile 'test the tensile strength of the specimen shall be not lessthan 9S % of the appropriate minimum value specified in BS 2621.

wire layerAax.

4.4 CERTIFICATE OF COMPLIANCE1 4

When the purchaser does not call for tests on wires taken from the strandedconductor, the manufacturer shall, if requested, furnish him with a certificategiving the results of the tests made on samples taken in accordance with 4.1.1

e amounts of DS 2627 WrOullht aluminium for electrical purposes. Wire '.


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as 21:5 : Part 1 : 19 70TABLE 2. ALUMINIUM WIRES USED TN THE CONSTRUCTION OF

STANDARD ALUMfNIUM STRANDED CONDtJCTORS1 3 4 I 5- ------.-- ,_ - -~-----~----2

Standardrestsranceat 20'Cper km

MinimumbreakingIO;ld forstandarddiameterwire

Standarddiameter

----1----------- -----------Standarddiameter

("r~1-sectionalarea ofstandarddiameterwire

mm206310325340

3734;22

-, j ..." , . " ~ . ; - o . _ : J ' : : 519 lGl.~).1 . . . . ;.. ;;/ ;;: ,-,~,ql "2 2JO151:1 40':)1 ~. . . . . . . , . ~'!:iJ;_C.Ot1698 4550 1664 2 7 C O

':'7S4'22

4394'&5

439465

NOTE. The W1lue,given in Columns 2 to , are given for information only.

!tIfI

10


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NSTRUcrION OFDUcrORS -

ES 215 : P:ut I : 1970TABLE 3. STANDARD ALUMINIUM STRANDED CONDUCTORS

5 1

1 1 3 4 S 6 7 ICalculatedNominal Stranding Approxl- Approxl- a.e, Calculated Nominalaluminium and wire Sectional mate male resistance IlCeakina alllllliniumarea diameter area overall mass per at lOGC loa4 areadiameter kID per kID

mml mm mml mm ka n kN 10m'22 7/206 23-33 618 64 1227 '399 2250 '/13'10 5283 9'30 145 0'5419 828 5060 7/3'40 6355 1020 174 0'4505 990 00

: L e G 7i'';'39 lC6


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BS 21S : Part 1 : 1970APPENDIX A

NOTES ON THE CALCULATION OF TABLE 3A.I Increase In length due to stranding. When straightened out, each wire inany particular layer of a stranded conductor, except the central wire, is longerthan the stranded conductor by an amount depending on the lay ratio of thatlayer.

A.2 Resistance and mass or conductor. The resistance oi any Jength of a strandedconductor is the resistance of the same length 01 ,m y (me wire multiplied by aconstant, as set out in Table 4.

The mass ('I'~~r"'_ 'vh~In 'm y particular laver of stranded conductor, exceptthe central wire, will be greater than that of an equal length of straight wireby an amount depending on the Ja y ratio oi .ioa( :ajcr (see A: , : ;C0 '1"). i:::: t2: : : '!mass of any !engel10: unaluminium .>tra::ccs ccnductor is, therefore, obtainedb:! m~d-tir!Y:.-:; t : : 2 - : ~ - . : : J ';::'~r: e C l l _ ~ - " , . 1i~;~g~~ic , ; st;"d~ht wire by co n ::lp:jro~rlnte.. .... ...~ ... ~ -.,.. ..+ "',~ ~~ ._~" :. .., " '~".-_.l , ,....~J.~.' . ,", > _ ~ . . _ ~ . _

1n


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BS 2]5 : Part 1 : 1970APPENDIX B

XA NOTE ON MODULUS OF ELASTICiTY AND COEF.FlCIENT OFLiNEAR EXPANSION~TION OF TABLE 3 The practical moduli of elasticity given below are based on an analysis of the

final moduli determined from a large number of short term $k~ss/st[~!!J_~t~~and may be taken as applying to conductors stressed between 15 % and SO%of the breaking load of the conductor. They maybe regarded as being accurateto within 300 hbar ".

/hcn straightened out, each wire inor, except the central wire, is longert depending on the lay ratio of that

resis:;2th c.

ry f any length of a strandedone wire multiplied by a

Numberof wires inconductorPractical(fi!1.31) modulusor elasticity

Coellicientof IineareXp8nsioa/oC

: laver of stranded conductor, exceptJ f an ecual length of straight wiref :1: :11 laver (see A.I above). The total' ,>~dconductor is, therefore. obtained

7 5SC-0!1 2 ~ ' O x 10-t'2..~OX 10-~I! 230 X lO-t

. . . . . .~.~~3 7

. , ' ... - - -_ - ., -.. .....10 , ., ; -) .':_-IIi~~.'~" ~"".":.'.., _- J ' ".~ .> . .-- . . . . _" _ , '

. The creaking 102.dcf an aiorn.niurnan 37 wires, in terms of the strengthstaken to be 95 % of the sum of thewires calculated from the specified

CONSTANTS3

Electrlalresistance

1 01447ItI

, t 1 hbur - 10 MN/m' - 10 N/mm".005357

002757 13


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/1B S 2t5 : Part 1 : J9 70

APPENDIX CCODE NAMES FOR STANDARD ALUMINIUM STRANDED

CONDUcrORSn

NOTE. These code names lire not lin essential part of the standard. They are given for con-venience in ordering conductors.Nominalaluminium Stranding Code namearea-~, I;004 .. ,.. . "

22 7/206 I M1DGE50 71310 I ANT60 i/j...;u I FLi.,~;" :13 r:l.l,....v iJ-v;} I50 1~;!'~:':5 I-I0RNET2CO 191373 I CHAFER250 Il)/,t,2::! I COCKROACH3 C O 1 ( \ IJ-S5 B!JTTE:'{FL Y1r


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"

BS 215: Part 1 : 1970A?PEJ.~DIX D

c NON-STANDARD CONSTRUCTIONS\.LUMINIUM STRANDEDRS

D.l Lay ratios and straO(ijng constants

Jf the standard, They are liven for con- _ _ _ I ' , 3 ' . I. I ! 1 , , . 1 . 1 1 1 ,Lay ratio

12 13

StraDdloa I:onstaata .

C o de n ame

MIDGEANT

',VAS?l~~()R?'lET::l-L\FER D,:::'..!:~:~_~;.~.::.;r : : : .1~- : ,2~~~:;~d. T~J l~r,~:~\jr~ead of an alurninium vtrandcd~~~~2:_" . ; :~r ::);~t::.:~~:-:~~-nc'r~ r~_:":l -37 ~rV~r!s, in .erm s of the :)tren~~h3()f t!~e

individual component wires, may be taken to he 90 % of :he sum of t : :; : :;tr!ng!hsor' tho;individual aluminium wires ca.culated in:lin 0 . ; ; spcciZ.c..... ;;,.:;;,'-"' .. ':;";;.:.:;': .. ..,...." .1-~~.. ~-\:). . . . .9UTTERFLYC,'HliEDE

!i) 1I!tj iI ftI !! 1 !I IS ~t

BS 215-1 Aluminum Conductors & Aluminum Conductors Steel-Reinforced for Overhead Power Transmission...

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