1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS 7870-5:2011Incorporating Corrigendum No. 1LV and MV polymericinsulated cables for use bydistribution and generationutilitiesPart 5: Polymeric insulated aerialbundled conductor
2、s (ABC) of ratedvoltage 0.6/1 kV for overheaddistribution(Implementation of HD 626)Publishing and copyright informationThe BSI copyright notice displayed in this document indicates when the documentwas last issued. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978
3、 0 580 78843 7ICS 29.060.20The following BSI references relate to the work on this standard:Committee reference GEL/20/16Draft for comment 11/30219798 DCPublication historyFirst published January 1999Second (present) edition, December 2011Amendments issued since publicationDate Text affectedAugust 2
4、012 See forewordBS 7870-5:2011 BRITISH STANDARDContentsForeword ii1 Scope 12 Normative references 13 Voltage designation 24 Conductors 25 Insulation 26 Identification of cores 37 Laying up 48 Manufacturers identification 49 Testing 510 Routine tests 511 Sample tests 612 Type tests 813 Additional con
5、trol or street lighting cores 914 Sealing and drumming 10AnnexesAnnex A (normative) Additional requirements for insulated control or streetlighting cores 11Annex B (informative) Guidance on type approval 11Annex C (normative) Slippage test 12Bibliography 14List of figuresFigure 1 Laying up sequence
6、of four-core bundles 4Figure C.1 Clamping block for slippage test 12Figure C.2 Sample dimensions for slippage test 13List of tablesTable 1 Requirements for two, four and five-core bundles 3Table 2 Lay lengths 4Table 3 Schedule of tests 5Table 4 Minimum slippage loads for ABCs 7Table 5 Requirements f
7、or insulation material 9Table C.1 Thread core diameter of threaded insert 13Summary of pagesThis document comprises a front cover, an inside front cover, pages i to iv,pages 1 to 14, an inside back cover and a back cover.BRITISH STANDARD BS 7870-5:2011 The British Standards Institution 2012 iForewor
8、dPublishing informationThis part of BS 7870 is published by BSI Standards Limited, under licence fromThe British Standards Institution, and came into effect on 31 December 2011. Itwas prepared by Subcommittee GEL/20/16, Medium/High voltage cables, underthe authority of Technical Committee GEL/20, El
9、ectric cables. A list oforganizations represented on these committees can be obtained on request totheir secretary.SupersessionThis part of BS 7870 supersedes BS 7870-5:1999, which is withdrawn.Relationship with other publicationsBS 7870 implements the nationally applicable parts of Harmonization Do
10、cumentsHD 603, 605, 620, 626 and 627 published by the European Committee forElectrotechnical Standardization (CENELEC) in accordance with the decision ofthe CENELEC Technical Board.BS 7870 applies to cables for fixed installations having a rated voltage U0/U upto and including 19/33 kV, and is publi
11、shed as a series of separate parts andsections, as listed in the table in the foreword to BS 7870-1.BS 7870-5 implements HD 626 S1 Part 4M, and is to be read in conjunction withBS 7870-1 and BS 7870-2.Information about this documentThis is a full revision of the standard and brings the standard up t
12、o date inaccordance with current practice in the industry.The start and finish of text introduced or altered by Corrigendum No. 1 isindicated in the text by tagsand.A general guide to use for the types of cable specified in BS 7870 is given inBS 7870-1, Annex A.Hazard warningsWARNING. This British S
13、tandard calls for the use of substances and/orprocedures that can be injurious to health if adequate precautions are nottaken. It refers only to technical suitability and does not absolve the userfrom legal obligations relating to health and safety at any stage.Use of this documentIt has been assume
14、d in the preparation of this British Standard that theexecution of its provisions will be entrusted to appropriately qualified andexperienced people, for whose use it has been produced.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Itsrequiremen
15、ts are expressed in sentences in which the principal auxiliary verb is“shall”.Commentary, explanation and general informative material is presented insmaller italic type, and does not constitute a normative element.BRITISH STANDARDBS 7870-5:2011ii The British Standards Institution 2012Contractual an
16、d legal considerationsThis publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legalobligations.BRITISH STANDARD BS 7870-5:2011 The British Standards Instit
17、ution 2012 iiiBRITISH STANDARDBS 7870-5:2011This page deliberately left blankiv The British Standards Institution 20121 ScopeThis part of BS 7870 specifies requirements for the construction, dimensions andmechanical and electrical properties of polymeric insulated aerial bundledconductors (ABCs) of
18、rated voltage 0.6/1(1.2) kV, designed for a maximumcontinuous conductor operating temperature of 75 C.This part of BS 7870 specifies requirements for ABCs with the following: two, four or five-core construction; phase and neutral conductors of equal size and type; conductor sizes from 25 mm2up to an
19、d including 120 mm2; optional, insulated control or street lighting cores (see Annex A).NOTE 1 The fifth core in the five-core bundle is designated as a protectiveconductor (protective core), i.e. a conductor used for some measure of protectionagainst electric shock.NOTE 2 Guidance on type approval
20、is given in Annex B.2 Normative referencesThe following referenced documents are indispensable for the application ofthis document. For dated references, only the edition cited applies. For undatedreferences, the latest edition of the referenced document (including anyamendments) applies.BS 2627, Sp
21、ecification for wrought aluminium for electrical purposes WireBS 7870-1, LV and MV polymeric insulated cables for use by distribution andgeneration utilities Part 1: GeneralBS 7870-2, LV and MV polymeric insulated cables for use by distribution andgeneration utilities Part 2: Methods of testBS EN 50
22、182:2001, Conductors for overhead lines Round wire concentric laystranded conductorsBS EN 60228, Conductors of insulated cablesBS EN 60811-1-1, Insulating and sheathing materials of electric and opticalcables Common test methods Part 1-1: General application Measurement ofthickness and overall dimen
23、sions Tests for determining the mechanicalpropertiesBS EN 60811-1-2, Common test methods for insulating and sheathing materialsof electric and optical cables Part 1-2: General application Thermal ageingmethodsBS EN 60811-1-3, Insulating and sheathing materials of electric and opticalcables Common te
24、st methods Part 1-3: General application Methods fordetermining the density Water absorption tests Shrinkage testBS EN 60811-2-1, Insulating and sheathing materials of electric and optical cables Common test methods Part 2-1: Methods specific to elastomeric compounds Ozone resistance, hot set and mi
25、neral oil immersion testsBS EN 60811-3-1, Insulating and sheathing materials of electric cables Commontest methods Part 3: Methods specific to PVC compounds Section 3-1:Pressure test at high temperature Tests for resistance to crackingBRITISH STANDARD BS 7870-5:2011 The British Standards Institution
26、 2012 1BS EN 60811-4-1, Insulating and sheathing materials of electric and opticalcables Common test methods Part 4-1: Methods specific to polyethylene andpolypropylene compounds Resistance to environmental stress cracking Measurement of the melt flow index Carbon black and/or mineral fillercontent
27、measurement in polyethylene by direct combustion Measurement ofcarbon black content by thermogravimetric analysis (TGA) Assessment ofcarbon black dispersion in polyethylene using a microscopeBS EN ISO 6892-1, Metallic materials Tensile testing Part 1: Method of test atambient temperatureIEC 60885-1,
28、 Electrical test methods for electric cables Part 1: Electrical tests forcables, cords and wires for voltages up to and including 450/750 VPD 2379, Register of colours of manufacturers identification threads for electriccables and cords3 Voltage designationABCs shall be designated by the voltages U0
29、, U and Um, expressed in the formU0/U (Um). The voltage designation of the ABCs specified in this standard shallbe 0.6/1(1.2) kV.4 ConductorsExcept for the conductors of bare protective cores, the conductors shall be ofcompacted, circular, stranded aluminium in accordance with BS EN 60228. Theindivi
30、dual wires used in the construction shall be material 1350 in the H9condition as specified in BS 2627. The individual wires shall be of the samenominal diameter before stranding into a compacted circular formation.Successive layers of wire shall have opposite directions of lay, the outermostlayer be
31、ing right-handed. The conductors shall conform to the requirementsspecified in Table 1.For a five-core bundle, if agreed between the manufacturer and the purchaser,it shall be permissible for a bare protective core to be provided. The conductorsof bare protective cores shall be of Type 60-AL3, as sp
32、ecified inBS EN 50182:2001 and shall conform to the requirements specified inBS EN 50182:2001.For two-core bundles, the conductor sizes shall be from 25 mm2up to andincluding 95 mm2. For five-core bundles, the phase and neutral cores shall be50 mm2,70mm2or 95 mm2and shall conform to the requirements
33、 of Table 1.The protective core shall be at least 25 mm2and, if insulated, shall also conformto the requirements of Table 1.5 InsulationExcept for the conductors of bare protective cores, all conductors shall beinsulated with extruded cross-linked polyethylene. The insulation shall becoloured black.
34、The insulation thickness and core diameter shall conform to the requirementsspecified in Table 1.BRITISH STANDARDBS 7870-5:20112 The British Standards Institution 2012Table 1 Requirements for two, four and five-core bundlesParameter Nominal cross-sectional area of conductorsmm225 35 50 70 95 120Nomi
35、nal number of wires in conductor 7 7 19A)19A)19A)19A)Diameter of conductor: minimum (mm) 5.6 6.6 7.7 9.3 11.0 12.5 maximum (mm) 6.5 7.5 8.5 10.2 12.0 13.5Minimum average thickness of insulation (mm) 1.3 1.3 1.5 1.5 1.7 1.7Minimum thickness of insulation at anypoint (mm)1.07 1.07 1.25 1.25 1.43 1.43M
36、aximum thickness of insulation: phase core excluding ribs (mm) 2.1 2.1 2.1 2.1 2.1 2.1 neutral core including ribs (mm) 2.3 2.3 2.3 2.3 2.3 2.3Maximum diameter of core: phase core excluding ribs (mm) 9.7 10.7 12.1 13.8 16.1 17.6 neutral core including ribs (mm) 10.2 11.2 12.6 14.3 16.6 18.1Neutral c
37、ore identification: number of ribs 12 12 12 16 16 16Maximum d.c. resistance of conductor in bundleat 20 C (/km)1.200 0.868 0.641 0.443 0.320 0.253Minimum tensile strength of conductor (kN)B)4.1 5.6 7.6 11.0 15.3 19.4A)Subject to a tolerance of one wire.B)Calculated value based on a tensile strength
38、of 170 N/mm2.6 Identification of cores6.1 Phase coresThe individual phase cores of a four-core bundle shall be identified by one, twoand three continuous longitudinal ribs, respectively. In the case of two-corebundles, the phase core shall be identified by one rib. The ribs shall have a basewidth of
39、 (1 0.2) mm and a separation distance of 1 mm to 2 mm. The totalproportion of a cores circumference taken up by the ribs shall not exceed 20%measured from rib centre to rib centre, and the rib separation shall be the samefor all cores in the ABC to within 0.2 mm. The minimum rib height shall be0.5 m
40、m.6.2 Neutral coresThe surface of the neutral core shall be lightly ribbed continuously along itslength with a minimum of 12 ribs for cores up to and including 50 mm2and aminimum of 16 ribs for cores above 50 mm2. Each rib shall have a minimumheight of 0.25 mm and a base width of (0.5 0.1) mm. Ribs
41、shall be evenlyspaced around the circumference of the core. An intermittent absence of up to25% of the specified number of ribs at any point shall be permissible.6.3 Insulated protective coresThe insulation of insulated protective cores shall be smooth.BRITISH STANDARD BS 7870-5:2011 The British Sta
42、ndards Institution 2012 37 Laying upThe insulated cores shall be laid upwith a left-hand direction of lay and inthe sequence shown in Figure 1.Protective, control and street lighting cores shall be laid in the outer intersticesof the phase and neutral cores (see Annex A).The length of lay of the cor
43、es shall be as given in Table 2.Figure 1 Laying up sequence of four-core bundlesTable 2 Lay lengthsNominal cross-sectional area ofconductormm2Lay lengthmmTwo-core Four-core Five-coreMin. Max. Min. Max. Min. Max.25 438 557 523 666 35 482 613 576 734 50 543 692 651 829 766 97470 618 787 741 944 860 10
44、9595 719 916 865 1100 920 1170120 944 1201 8 Manufacturers identificationThe identification of the manufacturer shall be either by a coloured thread or aname tape applied beneath the insulation of at least one core. Where theidentification is by means of a coloured thread, the colour shall be in acc
45、ordancewith PD 2379.BRITISH STANDARDBS 7870-5:20114 The British Standards Institution 20129 TestingTesting shall be performed in accordance with the schedule of tests given inTable 3.Table 3 Schedule of testsTest Test method andrequirements givenin clauseRoutine testsConductor resistance 10.1Spark t
46、est:i) on insulated cores 10.2.1ii) on complete bundle 10.2.2Voltage test on complete bundle 10.3Identification:i) of cores 10.4ii) of manufacturer 10.5Sample testsTensile test 11.1Conductor construction 11.2Insulation:a) thickness 11.3b) core outside diameter 11.4c) rib geometry and spacing 11.5d)
47、hot set test 11.6Laying up 11.7Slippage test 11.8Type testsA.C. voltage test 12.1.2Insulation resistance 12.1.3Insulation material tests 12.2Tensile tests on conductor 12.310 Routine tests10.1 Conductor resistance testThe d.c. resistance of each conductor shall be measured in accordance with ofBS 78
48、70-2, 3.1.1 and the results, when corrected to 20 C, shall conform to thevalues specified in Table 1.10.2 Spark test10.2.1 Spark test on individual insulated coresSpark testing shall be performed on each individual insulated core, after theapplication of the insulation, in accordance with BS 7870-2,
49、 3.6.1 at thefollowing voltage: for conductor sizes up to and including 35 mm215 kV a.c. or 22.5 kV d.c.; for conductors sizes above 35 mm220 kV a.c. or 30 kV d.c.BRITISH STANDARD BS 7870-5:2011 The British Standards Institution 2012 5No breakdown shall occur.10.2.2 Spark test on complete bundleAfter laying up into the complete bundle, for ABCs with fully insulated coresonly, the ABC shall be spark tested in accordance with BS 7870-2, 3.6.1 at1
