1、BRITISH STANDARD BS 215-1: 1970 Specification for Aluminium conductors and aluminium conductors, steel-reinforced For overhead power transmission Part 1: Aluminium stranded conductors UDC 621.315.55:669.71BS 215-1:1970 This British Standard, having been approved by the Non-ferrous Metals Industry St
2、andards Committee, was published under the authority of the Executive Board on 31 March 1970 BSI 03-1999 First published, October, 1925 First revision, January, 1930 Second revision, March, 1934 Third revision, December, 1956 Fourth revision, March, 1970 The following BSI references relate to the wo
3、rk on this standard: Committee reference NFE/24 Draft for comment 68/29131 ISBN 580 05759 3 Co-operating organizations The Non-ferrous Metals Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government department
4、s and scientific and industrial organizations: Aluminium Federation* Institution of Mechanical Engineers Association of Bronze and Brass Founders (Automobile Division) Association of Consulting Engineers Institution of Mining and Metallurgy Board of Trade Institution of Production Engineers British
5、Bronze and Brass Ingot Institution of Structural Engineers Manufacturers Association Lead Development Association British Electrical and Allied Manufacturers Light Metal Founders Association Association* London Metal Exchange British Lead Manufacturers Association Magnesium Industry Council British
6、Non-ferrous Metals Federation Ministry of Defence, Army Department British Non-ferrous Metals Ministry of Defence, Navy Department FederationHigh Conductivity Copper National Brassfoundry Association Group Non-ferrous Metal Stockists* British Non-ferrous Metals Research Post Office* Association Roya
7、l Institute of British Architects Copper Development Association Society of Motor Manufacturers and Traders Crown Agents for Oversea Governments and Ltd. Administrations Tin Research Institute Electric Cable Makers Confederation* Zinc Development Association Institute of British Foundrymen Individua
8、l manufacturer Institute of Metals The Government department and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British standard: British Railways Board
9、Institute of Iron previously the requirements for aluminium stranded conductors were included together with those for steel-cored aluminium conductors, now covered by BS215-2, in the one publication. In this revision all dimensions are included in metric units and the requirements of the standard ha
10、ve been amended to conform substantially with those of IECPublication207, “Aluminium stranded conductors”. As a result there are a number of changes in the specification. Lay ratio is now defined as the ratio of the axial length of a complete turn of the helix to the external diameter of the helix i
11、nstead of to the mean diameter of the helix as hitherto. The basis for calculating conductor breaking loads has been altered. Values of the moduli of elasticity quoted in an appendix are practical values obtained by test, which are considered to be of more practical significance than the calculated
12、values formerly quoted. In the course of metrication the sizes of standard conductors, of which the number has been restricted, have been maintained unchanged except for negligible differences due to the expression of wire diameters in millimetres. The sizes of conductors are designated by nominal a
13、luminium areas (mm 2 ) in place of the formerly used nominal copper areas (in 2 ). For convenience the nominal aluminium areas have been taken as being numerically1000 times the previous nominal copper areas. At the present time there is an increasing use of conductors of constructions other than th
14、ose covered in this standard. To facilitate standardization of these constructions lay ratio limits and the appropriate stranding factors are included in an appendix. Detailed requirements for aluminium wires are not included in this standard, but are specified in BS2627, “Wrought aluminium for elec
15、trical purposes. Wire”. All stresses are quoted in terms of the hectobar (hbar 1) ). Other 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. BS 215-2, Alumi
16、nium conductors, steel-reinforced. BS 3242, Aluminium alloy stranded conductors for overhead power transmission. 1) 1 hbar = 10 MN/m 2= 10 N/mm 2 .BS 215-1:1970 BSI 03-1999 iii A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are r
17、esponsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages1to4, an inside back cover and a back cover. This standard has be
18、en updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.iv blankBS 215-1:1970 BSI 03-1999 1 1 General 1.1 Scope Part 1 of this British Standard applies to aluminium stranded conductors for overhead power transmi
19、ssion. 1.2 Definitions For the purposes of this Part of this British Standard the following definitions apply: stranded conductor a conductor consisting of seven or more aluminium wires of the same nominal diameter twisted together in concentric layers. When the conductor consists of more than one l
20、ayer, successive layers are twisted in opposite directions diameter the mean of two measurements at right angles taken at the same 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 of
21、 the letter Z when the conductor is held vertically. With left-hand lay, the wires conform to the direction of the central part of the letter S when the conductor is held vertically lay ratio the ratio of the axial length of a complete turn of the helix formed by an individual wire in a stranded con
22、ductor to the external diameter of the helix For other definitions reference should be made to BS205 2) . 1.3 Standards for hard-drawn aluminium wire 1.3.1 Resistivity. The resistivity of aluminium wire depends upon its purity and its physical condition. For the purposes of this British Standard the
23、 maximum value permitted is 2.826447 cm at20 C, and this value shall also be used as the standard resistivity for the purpose of calculation. 1.3.2 Density. At a temperature of 20C the density of hard-drawn aluminium wire is to be taken as2.703 g/cm 3 . 1.3.3 Coefficient of linear expansion. The coe
24、fficient of linear expansion of hard-drawn aluminium is to be taken as23 10 6 /C. 1.3.4 Constant-mass temperature coefficient. At a temperature of20 C the “constant mass” temperature coefficient of resistance of hard-drawn aluminium wire, measured between two potential points rigidly fixed to the wi
25、re, is taken as0.00403/C. 2 Material The aluminium wires used in the construction of the conductor shall be material GIE in theH9 condition as specified in BS2627 3) . By agreement between the purchaser and the manufacturer a suitable grease may be applied to the centre wire, or additionally to wire
26、s in specific layers, evenly throughout the length of the conductor. 3 Dimensions and construction 3.1 Standard sizes of wires The aluminium wires for the standard constructions covered by this specification shall have the diameters specified in Table 2. 3.2 Standard sizes of aluminium stranded cond
27、uctors 3.2.1 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) and resistances may be taken as being in accordance with Table 3. 3.3 Joints in wires 3.3.1 Conductors containing seven wires. There shall b
28、e no joints in any wire of a stranded conductor containing seven wires, except those made in the base rod or wire before final drawing. 3.3.2 Conductors containing more than seven wires. In stranded conductors containing more than seven wires, joints in individual wires are permitted in addition to
29、those made in the base rod or wire before final drawing, but no two such joints shall be less than15 m apart in the complete stranded conductor. Such joints shall be made by resistance or cold-pressure butt-welding. They are not required to fulfil the mechanical requirements for unjointed wires. Joi
30、nts made by resistance butt-welding shall, subsequent to welding, be annealed over a distance of at least200mm on each side of the joint. 2) BS205, “Glossary of terms used in electrical engineering”. 3) BS2627, “Wrought aluminium for electrical purposes. Wire”.BS 215-1:1970 2 BSI 03-1999 Table 1 Lay
31、 ratios for aluminium stranded conductors 3.4 Stranding 3.4.1 The wire used in the construction of a stranded conductor shall, before stranding, satisfy all the relevant requirements of this standard. 3.4.2 The lay ratio of the different layers shall be within the limits given in Table 1. NOTEIt is
32、important to note that lay ratio is now defined as the ratio of the axial length of a complete turn of the helix formed by an individual wire in a stranded conductor to the external diameter of the helix. 3.4.3 In all constructions, the successive layers shall have opposite directions of lay, the ou
33、termost layer being right-handed. The wires in each layer shall be evenly and closely stranded. 3.4.4 In aluminium stranded conductors having multiple layers of wires, the lay ratio of any layer shall be not greater than the lay ratio of the layer immediately beneath it. 3.5 Completed conductor The
34、completed conductor shall be free from dirt, grit, excessive amounts of drawing oil and other foreign deposits. 4 Tests 4.1 Selection of test samples 4.1.1 Samples for the tests specified in 4.3, shall be taken by the manufacturer before stranding, from not less than10% of the individual lengths of
35、aluminium wire which will be included in any one consignment of stranded conductor. One sample, sufficient to provide one test specimen for each of the appropriate tests, shall be taken from each of the selected lengths of wire. 4.1.2 Alternatively, when the purchaser states at the time of ordering
36、that he desires tests to be made in the presence of his representative, samples of wire shall be taken from lengths of stranded conductor selected from approximately10% of the lengths included in any one consignment. One sample, sufficient to provide one specimen for each of the appropriate tests, s
37、hall be taken from each of an agreed number of wires of the conductor in each of the selected lengths. 4.2 Place of testing Unless otherwise agreed between the purchaser and the manufacturer at the time of ordering, all tests shall be made at the manufacturers works. 4.3 Tests The test samples taken
38、 under 4.1.1 shall be subjected to the following tests in accordance with BS2627 4)and shall meet the requirements of that standard: Test samples taken under 4.1.2 shall be subjected to the same tests, but in the case of the tensile test the tensile strength of the specimen shall be not less than95%
39、 of the appropriate minimum value specified in BS2627 4) . 4.4 Certificate of compliance When the purchaser does not call for tests on wires taken from the stranded conductor, the manufacturer shall, if requested, furnish him with a certificate giving the results of the tests made on samples taken i
40、n accordance with 4.1.1. 1 2 3 4 5 6 7 Number of wires in conductor Lay ratio 6-wire layer 12-wire layer 18-wire layer min. max. min. max. min. max. 7 19 37 10 10 10 14 16 17 10 10 14 16 10 14 4) BS2627, “Wrought aluminium for electrical purposes. Wire”. Tensile test. Wrapping test. Resistivity test
41、.BS 215-1:1970 BSI 03-1999 3 Table 2 Aluminium wires used in the construction of standard aluminium stranded conductors Table 3 Standard aluminium stranded conductors 1 2 3 4 5 1 Standard diameter Cross-sectional area of standard diameter wire Mass per km Standard resistance at20C per km Minimum bre
42、aking load for standard diameter wire Standard diameter mm mm 2 kg 7 N mm 2.06 3.10 3.25 3.333 7.548 8.296 9.009 20.40 22.42 8.480 3.745 3.407 600 1 250 1 370 2.06 3.10 3.25 3.40 3.78 4.22 9.079 11.22 13.99 24.54 30.33 37.81 3.113 2.519 2.021 1 490 1 800 2 240 3.40 3.78 4.22 4.39 4.65 15.14 16.98 40
43、.91 45.90 1.867 1.664 2 410 2 700 4.39 4.65 NOTEThe values given in Columns2to5are given for information only. 1 2 3 4 5 6 7 1 Nominal aluminium area Stranding and wire diameter Sectional area Approximate overall diameter Approximate mass per km Calculated d.c. resistance at20C perkm Calculated brea
44、king load Nominal aluminium area mm 2 mm mm 2 mm kg 7 kN mm 2 22 50 60 7/2.06 7/3.10 7/3.40 23.33 52.83 63.55 6.18 9.30 10.20 64 145 174 1.227 0.541 9 0.450 5 3.99 8.28 9.90 22 50 60 100 150 200 7/4.39 19/3.25 19/3.78 106.0 157.6 213.2 13.17 16.25 18.90 290 434 587 0.270 2 0.182 5 0.134 9 16.00 25.7
45、0 32.40 100 150 200 250 300 400 19/4.22 19/4.65 37/3.78 265.7 322.7 415.2 21.10 23.25 26.46 731 888 1145 0.108 3 0.089 16 0.069 44 40.40 48.75 63.10 250 300 400 NOTE 1For the basis of calculation of this table, see Appendix A. NOTE 2The sectional area of a stranded conductor is the sum of the cross-
46、sectional areas of the individual wires. NOTE 3Attention is drawn to the fact that the sectional areas of standard conductors covered by this specification are larger than the nominal aluminium areas by which they are identified; they should not be compared directly with conductors manufactured exactly to those nominal areas.
