SANS 1418-1-2009 Aerial bundled conductor systems Part 1 Cores《天线分裂导线系统 第1部分：核心》.pdf

1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22811-8 SANS 1418-1:2009Edition 1.7SOUTH AFRICAN NATIONAL STANDARD Aerial bundled conductor systems Part 1: Cores WARNING Can only be used

4、 in conjunction with SANS 1418-2. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 1418-1:2009 Edition 1.7 Table of changes Change No. Date Scope Amdt 1 1987 Amended to add a further req

5、uirement for the marking of non-strain-bearing neutral cores and supporting cores and to rectify the omission of values for the diameter of supporting conductors. Amdt 2 1990 Amended to delete a marking requirement. Amdt 3 1994 Amended to change the diameter limits of some conductors, and the outsid

6、e diameter limits of the cores. Amdt 4 1995 Amended to update a definition, and to clarify a marking requirement. Amdt 5 1996 Amended to add a test method to determine the breaking force of aerial bundled conductors and to allow for different means of printing information on a core. Amdt 6 2007 Amen

7、ded to delete the standardization mark, to increase the allowable upper level of the acceptance range of tensile test results, to change a marking requirement and to change the designation of SABS standards to SANS standards. Amdt 7 2009 Amended to remove resistance values for service connections fr

8、om table 1, which were included by error in an earlier amendment, and to update a referenced standard. Foreword This South African standard was approved by National Committee SABS TC 66, Electric cables, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the

9、WTO/TBT agreement. This document was published in August 2009. This document supersedes SANS 1418-1:2007 (edition 1.6). A vertical line in the margin shows where the text has been technically modified by amendment No. 7. SANS 1418 consists of the following parts, under the general title Aerial bundl

10、ed conductor systems: Part 1: Cores. Part 2: Assembled insulated conductor bundles. Appendix A forms an integral part of this document. SANS 1418-1:2009 Edition 1.7 1 Contents Page Foreword 1 Scope 3 2 Definitions 3 3 Requirements 4 3.1 System operating conditions 4 3.2 Conductors (other than suppor

11、ting conductors). 4 3.3 Supporting conductors . 5 3.4 Dielectric (insulation) 6 3.5 Identification of cores . 6 4 Marking. 7 Appendix A Test method to determine the breaking force of aerial bundled conductors . 9 SANS 1418-1:2009 Edition 1.7 2 This page is intentionally left blank SANS 1418-1:2009 E

12、dition 1.7 3 Aerial bundled conductor systems Part 1: Cores 1 Scope 1.1 This part of the specification covers cores consisting of stranded conductors that are insulated with cross-linked polyethylene (XLPE) and that are intended for use in aerial bundled conductor (ABC) systems for overhead single-p

13、hase and three-phase electricity distribution operating up to 600/1 000 V. 1.2 It also covers a) supporting cores of stranded aluminium alloy that are insulated with XLPE and that are normally intended for use as strain-bearing neutral conductors in ABC systems; and b) cores consisting of stranded a

14、luminium or hard-drawn copper conductors that are insulated with XLPE and that are intended for use as service connection cables. NOTE 1 The standards referred to in this part of the specification are listed in appendix A of SANS 1418-2. NOTE 2 The configuration of the finished aerial bundled conduc

15、tors and the applicable tests are covered in SANS 1418-2. 2 Definitions 2.1 For the purposes of this part of the specification the following definitions shall apply: acceptable acceptable to the authority administering this standard or to the parties concluding the purchase contract, as relevant Amd

16、t 4 aerial-bundled conductors (or ABC or bundle) insulated conductors twisted together to form a cable that is intended to be suspended between structures core insulated conductor dielectric covering of a conductor that is intended to insulate the conductor electrically SANS 1418-1:2009 Edition 1.7

17、4 direction of lay lateral direction of inclination to the axis (either left-hand or right-hand) of the receding helix formed by a wire or a core in a cable lay ratio ratio of the axial length of a complete turn of the helix formed by an individual wire in a stranded conductor, to the external diame

18、ter of the helix formed by the wire standard operating voltage relationship Uo/U, where Uois the power frequency r.m.s. voltage between phase and neutral or earth, and U is the power frequency r.m.s. voltage between phases supporting conductor stranded conductor made of high strength aluminium alloy

19、 wires supporting core insulated supporting conductor intended to be used as the only mechanical support for a bundle 3 Requirements 3.1 System operating conditions Each core that is intended to form part of an aerial bundled conductor shall be suitable for use in a system having a standard operatin

20、g voltage not exceeding 600/1 000 V. 3.2 Conductors (other than supporting conductors) 3.2.1 Material a) The material of phase, neutral and auxiliary conductors shall be hard-drawn aluminium wire which, subject to the requirements of 3.2.3 and when tested in accordance with subsection 6.4.3 of part

21、2 of the specification, has a tensile strength, before stranding, of not less than 140 MPa and not more than 225 MPa. Amdt 6 b) The material of service connection conductors shall be either hard-drawn aluminium wire as in (a) above or hard-drawn copper wire that complies with the relevant requiremen

22、ts of SANS 1411-1. 3.2.2 Construction The conductors shall be stranded circular and, except where otherwise stated, shall comply with all the requirements for class 2 compacted stranded circular conductors of SANS 1411-1. 3.2.3 Joints In a stranded conductor, joints in individual wires are permitted

23、 (in addition to those made in the base rod or wire before final drawing) but two such joints shall be at least 15 m apart in the completed stranded conductor. Such joints shall have been made by resistance or cold-pressure butt-welding. The section of wire containing a joint is not required to comp

24、ly with the requirements for mechanical properties of an unjointed wire. 3.2.4 Compaction A conductor shall be so compacted as to comply with the dimensional requirements given in table 1. SANS 1418-1:2009 Edition 1.7 5 3.2.5 Separator A separator, e.g. kraft paper or polyester tape, may be applied

25、over a conductor to minimize sliding of the dielectric over the conductor. 3.2.6 Nominal cross-sectional areas of auxiliary and service connection conductors a) Auxiliary conductors. A conductor intended for auxiliary purposes, e.g. earthing or public lighting, shall have a nominal cross-sectional a

26、rea of at least 16 mm. b) Service connection conductors. A conductor intended for service connection cables shall have a nominal cross-sectional area of at least 10 mm if constructed from hard-drawn copper wires and at least 16 mm if constructed from hard-drawn aluminium wires. 3.2.7 Electrical and

27、physical properties and dimensions. The electrical and physical properties and the dimensions of a conductor and of a core shall comply with the appropriate requirements given in table 1. 3.3 Supporting conductors 3.3.1 Material A supporting conductor shall be constructed from aluminium-magnesium-si

28、licon alloy wires which, before stranding, comply with the requirements given in table 1A (compliance being assessed by the use of the appropriate test method): Table 1A Tensile strength and modulus of elasticity 1 2 3 Requirement Test method Tensile strength, MPa, min. 295 6.4.3 of SANS 1418-2:2009

29、 Modulus of elasticity, MPa 59 000 * Coefficient of linear expansion, per degree Celsius 23 10-6* *Under consideration. Amdt 7 3.3.2 Joints In a supporting conductor, joints in individual wires are permitted (in addition to those made in the base rod or wire before final drawing) but two such joints

30、 shall be at least 50 m apart in the completed supporting conductor. Such joints shall have been made by resistance or cold-pressure butt-welding, and wires containing joints shall, when tested in accordance with 6.4.3 of SANS 1418-2:2009, have at least 90 % of the tensile strength of unjointed wire

31、s of the same material. Amdt 7 3.3.3 Stranding a) The lay of the wires shall be right-hand (Z lay). b) The lay ratio shall be not less than 10 and not more than 14. SANS 1418-1:2009 Edition 1.7 6 3.3.4 Construction The number of wires in a supporting conductor and their nominal diameter shall be one

32、 of the combinations of values given in column 3 of table 1. 3.3.5 Separator A separator, e.g. kraft paper or polyester tape, may be applied over a conductor to minimize sliding of the dielectric over the conductor (see also 4.1.5 and 4.1.6 of SANS 1418-2:2009), and to facilitate stripping of the XL

33、PE dielectric. Amdt 7 3.3.6 Electrical and physical properties and dimensions The electrical and physical properties and the dimensions of a supporting conductor shall comply with the appropriate requirements given in table 1. 3.4 Dielectric (insulation) 3.4.1 Material The dielectric shall be cross-

34、linked polyethylene (XLPE) that complies with the requirements for type C of SANS 1411-41). In addition, the XLPE shall, when tested in accordance with 6.4.2 of SANS 1418-2:2009, contain at least 2,5 % (m/m) of carbon black. Amdt 7 3.4.2 Thickness of dielectric The average thickness of dielectric, d

35、etermined in accordance with 6.2 of SANS 1418-2:2009, shall be at least equal to the appropriate value given in column 8 of table 1. The thickness at any point may, however, be less than the average provided that the difference does not exceed 0,1 mm + 10 % of the average value. For ease of referenc

36、e, the minimum values are given in column 9 of table 1. Amdt 7 3.5 Identification of cores 3.5.1 Phase cores A phase core shall be identified by means of the number 1, 2 or 3 (or, alternatively, I, II or III), as appropriate, acceptably and legibly formed by indenting or embossing the exterior surfa

37、ce of the core, at intervals not exceeding 100 mm. The height of the characters shall be not less than 3 mm and not more than 10 mm. A phase core shall have no longitudinal ridge. 3.5.2 Non-strain-bearing neutral cores A neutral core shall be identified by means of two longitudinal ridges situated a

38、pproximately on opposite sides of the exterior surface of the core. The height of each ridge shall be at least 0,5 mm and the width of the ridge at its base shall be at least 1 mm. 1)SANS 1411-4, Materials of insulated electric cables and flexible cords Part 4: Cross-linked polyethylene (XLPE). SANS

39、 1418-1:2009 Edition 1.7 7 3.5.3 Supporting cores A supporting core shall be identified by a single longitudinal ridge on the exterior surface of the core. The height of the ridge shall be at least 0,5 mm and the width of the ridge at its base shall be at least 1 mm. NOTE A supporting core is normal

40、ly used as the system neutral, depending on the configuration of the finished bundle. 3.5.4 Auxiliary cores An auxiliary core shall be legibly and durably marked, at intervals not exceeding 100 mm, with the characters “A1“ but, if there are two auxiliary cores in a bundle, one shall be so marked “A1

41、“ and the other shall be marked “A2“. The height of the characters shall be not less than 3 mm and not more than 10 mm. 3.5.5 Earth cores An earth core shall be legibly and durably marked with the letter “E“ at intervals not exceeding 100 mm. 4 Marking 4.1 Non-strain-bearing neutral core or supporti

42、ng core The surface of a non-strain-bearing neutral core and of a supporting core shall, in addition to the identification required in terms of 3.5.2 and 3.5.3, respectively, be legibly and durably marked (by indenting, embossing or by printing) with the following information given at regular interv

43、als along the length of each core: Amdt 5 a) The legend “600/1 000 V“; b) a marking that identifies the manufacturer. Amdt 1; amdt 2 The manufacturers coloured identification thread2)shall be applied under the dielectric in addition to (b) above if printing is used for the marking. If embossing is u

44、sed for the marking, the coloured identification thread may be applied as an alternative to (b) above. Amdt 5 A coloured thread that will identify the year of manufacture of the core shall be applied under the dielectric of each non-strain-bearing neutral core and each supporting core, or alternativ

45、ely the year of manufacture shall be identified by the indenting or embossing of the dielectric. The characters used in the marking shall be upright and of height not less than 3 mm and not more than 10 mm. Amdt 4 Each specified mark shall be regarded as continuous if the distance between the end of

46、 the mark and the beginning of the next identical mark does not exceed 275 mm. Amdt 6 4.2 Marking by printing When printed marking is rubbed by hand for 15 s with a piece of cloth soaked with water and again for 15 s with a piece of cloth soaked with petroleum spirit, it shall remain legible. Amdt 5

47、 2)Refer to the register of manufacturers identification thread colours. Table 1 Properties of conductors and cores 1 2 3 4 5 6 7 8 9 10 11 Conductor Core Diameter of conductor* mm Breaking forceThickness of dielectric mm Outside diameter* mm Type of conductor or core Nominal cross-sectional area mm

48、2Number of wires min. Resistance at 20 C /km Max. Min. Max. Min. Average Min. Min. Max. Phase or auxiliary or non-strain-bearing neutral (aluminium) +16 25 35 50 70 95 120 150 6 6 6 6 12 15 15 15 1,91 1,20 0,868 0,641 0,443 0,320 0,253 0,206 4,6 5,8 6,8 7,9 9,7 11,0 12,5 13,9 5,1 6,3 7,3 8,4 10,2 12

49、,0 13,5 15,0 2 070 3 300 4 500 6 200 8 900 12 300 15 600 19 200 1,2 1,4 1,6 1,6 1,8 1,8 1,8 1,8 0,98 1,16 1,34 1,34 1,52 1,52 1,52 1,52 7,0 8,6 10,0 11,1 13,3 14,6 16,3 17,1 7,8 9,4 10,9 12,0 14,2 16,0 17,5 18,6 Service connection (aluminium) 16 25 6 6 1,91 1,20 4,6 5,6 5,2 6,5 2 070 3 300 1,2 1,4 0,98 1,16 7,0 8,6 8,0 9,6 Service connection (copper) 10 16 25 6 6 6 1,83 1,15 0,727 4,2 5,3 6,6 3 600 5 760 8 750 1,2 1,2 1,4