1、BS 6622:2007Electric cables Armoured cables with thermosetting insulation for rated voltages from 3.8/6.6 kV to 19/33 kV Requirements and test methodsICS 29.060.20NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDIncorporatingCorrigenda Nos. 1 and 2Publishing and
2、copyright informationThe BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2008ISBN 978 0 580 64039 1The following BSI references relate to the work on this standard:Committee reference GEL/20/16Draft for comment 06/30143016 DCPublication historyFirst p
3、ublished September 1985Second edition June 1991Third edition January 1999Fourth edition March 2007Amendments issued since publicationAmd. no. Date Text affected17200Corrigendum No. 1June 2007 Paragraph added to 11.2.1.First paragraph of 12.2.1 amended.Reference corrected in 18.12.Wording corrected i
4、n 17.3.Reference corrected in E.2.6.C2 August 2008 See 20.6 and 20.7BS 6622:2007 BSI 2008 iBS 6622:2007ContentsForeword iii1 Scope 12 Normative references 13 Terms and definitions 24 Voltage designation 45 Conductors 46 Conductor screen 47 Insulation 48 Insulation screen 59 Assembly of three-core ca
5、bles, including inner coverings and fillers 510 Metallic layer 711 Metallic armour 812 Oversheath 913 Marking 1014 End sealing 1115 Schedule of tests 1216 Test conditions 1417 Routine tests 1418 Sample tests 1619 Type tests Materials 2120 Type tests Electrical 24AnnexesAnnex A (informative) Recommen
6、dations for the selection of cables 28Annex B (normative) Information to be supplied and items to be agreed 32Annex C (informative) Recommendations for the installation of cables 33Annex D (informative) Guide to use of cables 36Annex E (normative) Fictitious calculation method for determination of d
7、imensions of protective coverings 39Annex F (normative) Rounding of numbers 42Annex G (informative) Guidance on the scope of type tests 43Annex H (normative) Thickness measurements 45Annex I (normative) Test method for cold strippability of the extruded semi-conducting layer of an insulation screen
8、46Annex J (normative) Method for measurement of resistivity of extruded semi-conducting conductor screen and insulation screen 47Annex K (normative) Method for measurement of resistivity of lapped inner covering 51Annex L (normative) Wet compatibility test for galvanized steel wires and semi-conduct
9、ing tape layers 51Bibliography 53List of figuresFigure J.1 Test piece and arrangement of electrodes for measurement of resistivity of the conductor screen 49Figure J.2 Test piece and arrangement of electrodes for measurement of resistivity of the insulation screen 50Figure L.1 Test cell for wet comp
10、atibility test of galvanized steel wires and semi-conducting tape layers 52BS 6622:2007ii BSI 2008List of tablesTable 1 Nominal thickness of insulation 5Table 2 Thickness of extruded inner covering 6Table 3 Nominal diameter of round armour wires 8Table 4 Schedule of tests 12Table 5 Tolerances on tem
11、perature values 14Table 6 D.C. resistance of copper wire screen 15Table 7 Voltage for partial discharge test 15Table 8 Voltage for test on complete cable 16Table 9 Number of samples for the four-hour voltage test and the hot set test on the insulation 17Table 10 Voltages for four-hour voltage test 2
12、0Table 11 Mass of zinc coating 22Table 12 Conditions for oversheath shrinkage test 23Table 13 Compatibility requirements 24Table 14 Tan in relation to voltage 25Table 15 Tan in relation to temperature 26Table 16 Voltage for impulse voltage test 27Table A.1 Selection of cables for three-phase a.c. sy
13、stems 30Table C.1 Bending radius during installation 33Table C.2 Bending radius during installation for cables adjacent to joints or terminations 33Table E.1 Fictitious diameter of conductor 40Table E.2 Increase of diameter for concentric conductors and metallic screens 41Summary of pagesThis docume
14、nt comprises a front cover, an inside front cover, pages i to iv, pages 1 to 53 and a back cover. BSI 2008 iiiBS 6622:2007ForewordPublishing informationThis British Standard was published by BSI and came into effect on 30 March 2007. It was prepared by Subcommittee GEL/20/16, Medium/high voltage cab
15、les under the authority of Technical Committee GEL/20, Electric cables. A list of organizations represented on this committee can be obtained on request to its secretary. SupersessionThis British Standard supersedes BS 6622:1999, which is withdrawn.Information about this documentThis revision of BS
16、6622 has been prepared to bring the requirements up to date in accordance with current practice in the industry and to align with the methods used for calculating cable component dimensions given in IEC 60502-2.This revision of BS 6622 specifies armoured cables. Unarmoured cables, which were specifi
17、ed in the previous edition or BS 6622, are no longer included. Unarmoured cables with a copper wire screen, which were specified in BS 6622:1999, are generally for use by the utilities and are now specified in BS 7870-4.This standard specifies requirements for cables in the rated voltage range from
18、3.8/6.6 kV up to 19/33 kV which are insulated with cross-linked polyethylene (XLPE) or ethylene propylene rubber compound (EPR). Cables with improved performance under fire conditions are specified in BS 7835.Hazard warningsWARNING. This British Standard calls for the use of substances and/or proced
19、ures that can be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage.Use of this documentIt has been assumed in the preparation of this British Standard that
20、 the execution of its provisions will be entrusted to appropriately qualified and experienced people, for whose use it has been produced.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Its requirements are expressed in sentences in which the prin
21、cipal auxiliary verb is “shall”.Commentary, explanation and general informative material is presented in smaller italic type and does not constitute a normative element.Contractual and legal considerationsThis publication does not purport to include all necessary provisions of a contract. Users are
22、responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.iv BSI 2008 This page deliberately left blankBS 6622:2007 BSI 2008 1BS 6622:20071 ScopeThis British Standard specifies requirements and test methods for the construction, dimensio
23、ns and mechanical and electrical properties of armoured cables with thermosetting insulation for rated voltages from 3.8/6.6 (7.2) kV up to 19/33 (36) kV inclusive, designed for a maximum continuous conductor operating temperature of 90 C and for a maximum short circuit conductor temperature of 250
24、C, for use in fixed installations such as networks or industrial installations.This British Standard specifies single-core and three-core cables for voltages in the range 3.8/6.6 (7.2) kV up to 19/33 (36) kV, with: a stranded copper, stranded aluminium or solid aluminium conductor or conductors; cro
25、ss-linked polyethylene or cross-linked ethylene propylene rubber insulation; a metallic screening layer of copper wire or copper tape and/or a metallic armour of aluminium or galvanized steel wire; a polyvinyl chloride compound (PVC) or polyethylene (PE) oversheath.NOTE Guidance on the selection of
26、cables is given in Annex A. Information to be supplied by the purchaser, and items to be agreed between the purchaser and the manufacturer, at the time of enquiry and/or order, are given in Annex B. Recommendations for the installation of cables are given in Annex C. Guidance on the use of cables is
27、 given in Annex D.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.BS 4727-2:
28、 Group 08, Glossary of electrotechnical, power, telecommunication, electronics, lighting and colour terms Part 2: Terms particular to power engineering Group 08: Electric cables BS 5099, Electric cables Voltage levels for spark testingBS 7655-1.2, Specification for insulating and sheathing materials
29、 for cables Part 1: Cross-linked elastomeric insulating compounds Section 1.2: General 90 C applicationBS 7655-1.3, Specification for insulating and sheathing materials for cables Part 1: Cross-linked elastomeric insulating compounds Section 1.3: XLPEBS 7655-4.2, Specification for insulating and she
30、athing materials for cables Part 4: PVC sheathing compounds Section 4.2: General applicationBS 7655-10.1, Specification for insulating and sheathing materials for cables Part 10: Polyethylene sheathing compounds Section 10.1: Thermoplastic medium density polyethylene (MDPE) sheathing compoundBS 6622
31、:20072 BSI 2008BS EN 10002-1, Metallic materials Tensile testing Part 1: Method of test at ambient temperatureBS EN 10244-2, Steel wire and wire products Non-ferrous metallic coatings on steel wire Part 2: Zinc or zinc alloy coatingsBS EN 50356, Method for spark testing of cablesBS EN 60228, Conduct
32、ors of insulated cablesBS EN 60230, Impulse tests on cables and their accessoriesBS EN 60332-1-2:2004, Tests on electric and optical fibre cables under fire conditions Part 1-2: Test for vertical flame propagation for a single insulated wire or cable Procedure for 1 kW pre-mixed flameBS EN 60811-1-1
33、, Insulating and sheathing materials of electric and optical cables Common test methods Part 1-1: General application Measurement of thickness and overall dimensions Tests for determining the mechanical properties BS EN 60811-1-2, Common test methods for insulating and sheathing materials of electri
34、c and optical cables Part 1-2: General application Thermal ageing methodsBS EN 60811-1-3, Insulating and sheathing materials of electric and optical cables Common test methods Part 1-3: General application Methods for determining the density Water absorption tests Shrinkage test BS EN 60885-3, Elect
35、rical test methods for electric cables Part 3: Test methods for partial discharge measurements on lengths of extruded power cables3 Terms and definitionsFor the purposes of this British Standard the terms and definitions given in BS 4727-2: Group 08 and the following apply.3.1 rated voltagereference
36、 voltage for which the cable is designed NOTE This is expressed as a combination of the values U0, U and Um.3.2 rated voltage U0nominal power-frequency voltage between any conductor and earth or metallic screen for which the cable is suitable3.3 rated voltage Unominal power-frequency voltage between
37、 phase conductors for which the cable is suitable3.4 maximum voltage Ummaximum sustained power-frequency voltage between phase conductors for which the cable is suitable3.5 cross-linked polyethylene (XLPE)thermosetting material formed by the cross-linking of thermoplastic polyethylene compound BSI 2
38、008 3BS 6622:20073.6 ethylene propylene rubber compound (EPR)thermosetting material comprising a cross-linked compound in which the elastomer is ethylene propylene3.7 polyvinyl chloride compound (PVC)combination of materials of which polyvinyl chloride is the characteristic constituent 3.8 polyethyl
39、ene (PE)thermoplastic compound based on polyethylene 3.9 nominal valuevalue, often used in tables, by which a quantity is designated NOTE In this standard, actual values to be checked by measurement, and on which tolerances are given, are usually specified in relation to particular nominal values. 3
40、.10 approximate valuevalue which is only indicativeNOTE In this standard, values described as “approximate” do not constitute requirements to be checked by measurements.3.11 fictitious valuevalue calculated in accordance with the “fictitious method” described in Annex E IEC 60502-2:2005, 3.1.4NOTE T
41、he fictitious values referred to in the present standard are “fictitious diameters”.3.12 routine teststests performed by the manufacturer on each manufactured length of cable to check whether the whole of each length meets the specified requirements3.13 sample teststests performed by the manufacture
42、r on samples of completed cable, or components taken from a completed cable, at a specified frequency, to determine whether the finished product meets the specified requirements3.14 type teststests made before supplying a particular type of cable on a general commercial basis, to determine whether t
43、he cable has satisfactory performance characteristics to be suitable for the intended application NOTE Type tests are of such a nature that, after they have been performed, they need not be repeated unless changes are made in the cable materials or design or manufacturing process which might change
44、the performance characteristics.BS 6622:20074 BSI 20084 Voltage designationCables shall be designated by the voltages U0, U and Umexpressed in the form U0/U (Um).NOTE The voltage designations of cables specified in this standard are as follows: 3.8/6.6 (7.2) kV; 6.35/11 (12) kV; 8.7/15 (17.5) kV; 12
45、.7/22 (24) kV; 19/33 (36) kV.5 ConductorsConductors shall be either plain annealed copper or aluminium, circular, and shall conform to BS EN 60228. Copper conductors shall be stranded (class 2) and aluminium conductors shall be either solid (class 1) or stranded (class 2). Conductors shall be compac
46、ted or uncompacted and be between 70 mm2and 1 000 mm2for copper or aluminium stranded conductors (class 2) and 70 mm2to 300 mm2for solid aluminium conductors (class 1).6 Conductor screenA conductor screen consisting of an extruded layer of a cross-linkable semi-conducting compound shall be applied o
47、ver the conductor and shall cover the surface of the conductor completely.NOTE A semi-conducting tape may be applied prior to the extruded layer, at the discretion of the manufacturer.The conductor screen shall be applied in the same operation as the insulation and shall be fully bonded to the insul
48、ation.7InsulationThe insulation shall be either XLPE (type GP 8) conforming to BS 7655-1.3 or EPR (type GP 7) conforming to BS 7655-1.2.The insulation shall be applied by extrusion and cross-linked to form a compact and homogeneous layer.NOTE The colour of the insulation should be such that it is ea
49、sily distinguishable from the screening materials.The nominal thickness of the insulation shall be as specified in Table 1. BSI 2008 5BS 6622:20078Insulation screen8.1 GeneralAn insulation screen shall be applied to all cables and shall consist of a cross-linkable extruded semi-conducting layer as specified in 8.2, in combination with a metallic layer (see 9.3 and 9.4 and Cla
