BS 7870-3 40-2011 LV and MV polymeric insulated cables for use by distribution and generation utilities Specification for distribution cables of rated voltage 0 6 1 kV XLPE insulat.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS 7870-3.40:2011Incorporating Corrigendum No. 1LV and MV polymericinsulated cables for use bydistribution and generationutilitiesPart 3: Specification for distributioncables of

2、rated voltage 0.6/1 kVSection 3.40: XLPE insulated, copperwire waveform concentric cableswith solid aluminium conductors(Implementation of HD 603)Publishing and copyright informationThe BSI copyright notice displayed in this document indicates when the documentwas last issued. The British Standards

3、Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 78838 3ICS 29.060.20The following BSI references relate to the work on this standard:Committee reference GEL/20/16Draft for comment 11/30214068 DCPublication historyBS 7870-3.4 first published December 1996First published as BS 78

4、70-3.40 (revision of BS 7870-3.4), September 2001Second (present) edition, December 2011Amendments issued since publicationDate Text affectedAugust 2012 See forewordBS 7870-3.40:2011 BRITISH STANDARDContentsForeword ii1 Scope 12 Normative references 13 Voltage designation 14 Core conductors 15 Insul

5、ation 26 Assembly of cores 27 Concentric conductor 28 Oversheath 39 Marking 310 End sealing 411 Dimensions 512 Tests 613 Routine tests 714 Sample tests 715 Type tests 8AnnexesAnnex A (informative) Guide to selection and use of cables 10Bibliography 11List of tablesTable 1 3-core, 3-phase cables 5Tab

6、le 2 4-core, 3-phase cables 5Table 3 Schedule of tests 6Table 4 Requirements for compatibility of insulation, oversheath and rubberlayer 9Table A.1 Guide to use 10Summary of pagesThis document comprises a front cover, an inside front cover, pages i to iv,pages 1 to 12, an inside back cover and a bac

7、k cover.BRITISH STANDARD BS 7870-3.40:2011 The British Standards Institution 2012 iForewordPublishing informationThis section 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 Subcommitte

8、e GEL/20/16, Medium/High voltage cables, underthe authority of Technical Committee GEL/20, Electric cables. A list oforganizations represented on these committees can be obtained on request totheir secretary.SupersessionThis section of BS 7870 supersedes BS 7870-3.40:2001, which is withdrawn.Relatio

9、nship with other publicationsBS 7870 implements the nationally applicable parts of Harmonization DocumentsHD 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 c

10、ables for fixed installations having a rated voltage U0/U upto and including 19/33 kV, and is published as a series of separate parts andsections, as listed in the table in the foreword of BS 7870-1.BS 7870-3.40 specifies a range of XLPE insulated, copper wire waveformconcentric cables with solid al

11、uminium conductors; it implements Part 5R ofHD 603 S1 A2, and is to be read in conjunction with BS 7870-1 and BS 7870-2.Information about this documentThis is a full revision of the standard, and brings the standard up to date inaccordance with current practice in the industry.The start and finish o

12、f 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 and specific details for the types of cable specified in this section ofBS 7870 are given in Annex A.Hazard warningsWARNING. Th

13、is British Standard 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

14、 been assumed 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. I

15、tsrequirements 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 7870-3.40:2011ii The British Standards Institution 201

16、2Contractual and 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 7870-3.40:2011 The Britis

17、h Standards Institution 2012 iiiBRITISH STANDARDBS 7870-3.40:2011This page deliberately left blankiv The British Standards Institution 20121 ScopeThis section of BS 7870 specifies requirements for the construction, dimensionsand mechanical and electrical properties of copper wire waveform cables wit

18、hsolid aluminium core conductors, XLPE insulation and PVC oversheath having arated voltage of 0.6/1(1.2) kV.It specifies requirements for the following types of cable:a) 3-core, 3-phase, with a concentric neutral/earth conductor of copper wiresbedded on a single rubber layer;b) 4-core, 3-phase and a

19、 separate neutral, with a concentric earth conductor ofcopper wires bedded on a single rubber layer.This section of BS 7870 is applicable to cables that are designed for a maximumcontinuous conductor operating temperature of 80 C and for a maximum shortcircuit conductor temperature of 250 C.2 Normat

20、ive 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 3988:1970+A3:1989, Specification for

21、 wrought aluminium for electricalpurposes Solid conductors for insulated cablesBS 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: Method

22、s of testBS EN 60228, Specification for conductors in insulated cables and cordsBS EN 60811-1-2, Insulating and sheathing materials of electric cables Commontest methods Part 1-2: General application Thermal ageing methodsBS EN 60811-1-3, Insulating and sheathing materials of electric cables Commont

23、est methods Part 1-3: General application Methods for determining thedensity Water absorption tests Shrinkage test3 Voltage designationCables shall be designated by the voltages U0, U and Um, expressed in the formU0/U (Um).The voltage designation of cables in this standard shall be 0.6/1(1.2) kV.The

24、 rated voltage of the cable shall be at least equal to the nominal voltage ofthe system for which it is intended.4 Core conductorsThe core conductors shall be circular or shaped solid aluminium in accordancewith Table 1 or Table 2, as applicable, and shall conform to the requirements forsolid conduc

25、tors (class 1) as specified in BS EN 60228. The conductors shall alsoconform to the dimensional requirements specified in BS 3988:1970+A3, 2.4.The geometry of the core conductors shall conform to BS 3988:1970+A3.Conformity shall be checked by visual examination and measurement asspecified in 14.2.BR

26、ITISH STANDARD BS 7870-3.40:2011 The British Standards Institution 2012 1The d.c. resistance shall conform to the relevant value given in Table 1 orTable 2, as applicable.Conformity shall be checked by the test method specified in 13.2.5 InsulationThe insulation of the core conductors specified in C

27、lause 4 shall be XLPE typeDIX 3, conforming to the requirements given in BS 7870-1, Annex B.The insulation shall be applied by extrusion and shall form a compact andhomogeneous layer.The thickness of the insulation shall be in accordance with the relevant valuesspecified in Table 1 or Table 2, as ap

28、plicable.Conformity shall be checked by the test methods specified in 14.4.The cores of all cables shall be identified by colours, as follows:a) 3-core: brown, black, grey;b) 4-core: brown, black, grey, blue.6 Assembly of coresThe cores shall be laid up with a right-hand direction of lay, in the seq

29、uencespecified in Clause 5.The minimum lay length of the cores shall be as specified in Table 1 or Table 2,as applicable.NOTE Suitable binder tapes may be applied to form a compact assembly.7 Concentric conductor7.1 MaterialThe concentric conductor shall consist of plain annealed copper wires.NOTE I

30、n order to maintain the waveform during manufacture, the copper wirestypically need to be annealed to a level to achieve greater than 18% elongation atbreak.7.2 ApplicationThe wires shall be applied concentrically with a waveform lay. The lay lengthshall be as given in Table 1 or Table 2, as applica

31、ble.The mean gap between adjacent wires shall not exceed 4 mm and at any pointthe gap shall not exceed 8 mm.The developed length of each wire in the waveform wavelength shall be at least106%.Conformity shall be checked by visual examination and measurement asspecified in 14.3.The d.c. resistance of

32、the concentric conductor shall conform to the relevantvalue given in Table 1 or Table 2, as applicable.Conformity shall be checked by the test method specified in 13.2.NOTE Examples of concentric conductor construction are given in Table 1 andTable 2.BRITISH STANDARDBS 7870-3.40:20112 The British St

33、andards Institution 20127.3 Rubber layerThe copper wires shall be bedded on a layer of soft non-vulcanizable syntheticrubber material which is compatible with the core insulation and PVCoversheath.Conformity shall be checked by testing in accordance with 15.6.The rubber layer shall fill the intersti

34、ces between the cores of the cable wherethese are not covered by binder tapes.The rubber layer shall be easily removable. Conformity shall be checked by themethod specified in 14.5.8 OversheathThe oversheath shall be an extruded layer of black PVC compound type DMV 23,conforming to the requirements

35、given in BS 7870-1, Annex B.The thickness of the oversheath shall conform to the relevant values specified inTable 1 or Table 2, as applicable.Conformity shall be checked by the test methods specified in 14.6.9 Marking9.1 External markingThe external surface of the cable shall be legibly marked with

36、 the followingelements:Element Example of markinga) Cable manufacturer Manufacturers name and their uniquefactory identifierNOTE 1 A simplified version of the manufacturers name, or trading name of themanufacturer, may be used in place of the full name.NOTE 2 Any suitable method may be used to unamb

37、iguously identify themanufacturers factory.NOTE 3 The manufacturers own trademark or equivalent may be added but thiscannot be used instead of the manufacturers name and identifier.b) Electric cable ELECTRIC CABLEc) Voltage designation 600/1 000 Vd) British Standard number BS 7870-3.401)e) Number of

38、 cores, type and nominalarea of core conductors, e.g.:3-core cable with 70 mm2aluminium core conductors havinga copper concentric neutral/earthconductor370AL1)Marking BS 7870-3.40 on or in relation to a product represents a manufacturersdeclaration of conformity, i.e. a claim by or on behalf of the

39、manufacturer that theproduct meets the requirements of the standard. The accuracy of the claim is solelythe claimants responsibility. Such a declaration is not to be confused with third-partycertification of conformity.BRITISH STANDARD BS 7870-3.40:2011 The British Standards Institution 2012 34-core

40、 cable with 95 mmaluminium core conductors havinga copper concentric earthconductor495ALf) Year of manufacture YYYYNOTE 4 The year of manufacture may take the form of the actual year (e.g. 2011)or a coded year identifier assigned by the manufacturer.The marking of elements a) to f) shall be by embos

41、sing or by indenting on theoversheath. Elements b), c) and d) shall appear, in any sequence that is deemedneither to confuse nor to conflict, on two or more primary lines along the axisof the cable, approximately equally spaced around the circumference of thecable. Elements a), e) and f) shall appea

42、r, together or separately, in anysequence that is deemed neither to confuse nor to conflict, either on one of theprimary lines, or on a secondary line or lines.The letters and figures shall consist of upright block characters. The charactersshall have a minimum height of 3 mm.The distance between th

43、e end of one element of marking and the beginning ofthe next identical element shall be not greater than 550 mm for elements b), c)and d) and not greater than 1 100 mm for elements a), e) and f).Conformity shall be checked by visual examination and measurement asspecified in 13.5.9.2 Mark of an appr

44、oval organizationalIf the mark of an approval organization is used, it shall be provided throughoutthe length of the cable, either as an identification thread or by marking on thesurface of the cable, as specified by the approval organization.If the mark is on the external surface of the cable, it s

45、hall be in the form of thesymbol(s) specified by the approval organization, and the distance between theend of one element of marking and the beginning of the next identical elementshall be not greater than 1 100 mm.Conformity shall be checked by visual examination and measurement asspecified in 13.

46、5.9.3 Additional markingWhere additional marking is made, it shall be throughout the length of thecable, and on the external surface of the cable, or by means of a tape or threadwithin the cable, or by a combination of these methods. If the additionalmarking is applied to the surface of the cable it

47、 shall not render illegible themarking specified in 9.1 and 9.2.The additional marking, however made, shall be repeated at intervals notexceeding 1 100 mm.Conformity shall be checked by visual examination and measurement asspecified in 13.5.10 End sealingBefore dispatch, the manufacturer shall cap t

48、he ends of the cables in order toform a seal to prevent the ingress of water during transportation and storage.BRITISH STANDARDBS 7870-3.40:20114 The British Standards Institution 201211 DimensionsThe thickness of each component layer shall be as specified in Table 1 or Table 2,as applicable.NOTE Ty

49、pical examples of concentric conductor construction and overall cablediameters are also given in Table 1 and Table 2.Table 1 3-core, 3-phase cablesParameter Nominal cross-sectional area of core conductormm235 70 95 120 185 240 300Form of core conductor Circular Sector shapedMinimum average thickness of insulation (mm) 0.9 1.1 1.1 1.2 1.6 1.7 1.8Minimum thickness of insulation at any point(mm)0.71 0.89 0.89 0.98 1.34 1.43 1.52Minimum lay length of cores (mm) 600 700 800 1 000 1 200 1 400 1 600Minimum average thickness