BS 6469-99 2-1992 Insulating and sheathing materials of electric cables - Part 99 Test methods used in the United Kingdom but not specified in BS EN 60811 - Section 99 2 Electrical.pdf

1、BRITISH STANDARDBS 6469-99.2: 1992Incorporating Amendment No. 1Insulating and sheathing materials of electric cables g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42

2、g43g55g3g47g36g58Part 99: Test methods used in the United Kingdom but not specified in BS EN 60811 Section 99.2 Electrical testsICS 29.035.01BS 6469-99.2:1992Manufacturers of Domestic Electrical Appliancesritish Approvals Service for Cablestish Cable Makers ConfederationCommittees responsible for th

3、is British StandardThInsulation CAluminium FederationAssociaAssociation of BBriThis British Standard, having been prepared under the direction of the Cables and Insulation Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 August 1992 BSI

4、 23 January 2006The following BSI references relate to the work on this standard:Committee reference CIL/20Draft for comment 91/32571 DCISBN 0 580 20808 7British Plastics FederationBritish Steel IndustryBritish Telecommunications plcDepartment of the Environment (Property Services Agency)Department

5、of Trade and Industry (Consumer Safety Unit, CA Division)Electricity AssociationEngineering Equipment and Materials Users AssociationInstitution of Electrical EngineersLondon Regional TransportThe following bodies were also represented in the drafting of the standard, through subcommittees and panel

6、s:British Railways BoardBritish Rubber Manufacturers Association Ltd.ERA Technology Ltd.GAMBICA (BEAMA Ltd.)Institution of Incorporated Executive EngineersLondon Underground Ltd.Queen Mary and Westfield CollegeTelecommunications Cables Group of BCMCAmendments issued since publicationAmd. No. Date Co

7、mments16086 January 2006 Change to Part titlee preparation of this British Standard was entrusted by the Cables and Standards Policy Committee (CIL/-) to Technical Committee IL/20, upon which the following bodies were represented:tion of Consulting EngineersBS 6469-99.2:1992 BSI 23 January 2006Conte

8、ntsPageCommittees responsible Inside front coverForeword ii1Scope 12Test values 13 Applicability 14 Type tests and other tests 15Sampling 16 Pre-conditioning and test temperature 17 Definitions 18 Method of test for insulation resistance constant (K value) 19 Method of test for power factor and perm

9、ittivity 210 Water absorption determined by the capacitance method 2Appendix A Corresponding clauses or sub-clauses in BS 6469:1990 and BS 6469:1992 3Appendix B Tests included in BS 6469:1992 not previously covered 4Table 1 Corresponding clauses or sub-clauses in BS 6469:1990 and BS 6469:1992 3Table

10、 2 Tests included in BS 6469:1992 not previously covered 4Publication(s) referred to 5iBS 6469-99.2:1992iisupersede BS 6469:1990 which is withdrawn.Parts 1 to 5 implement CENELEC HD 505-1 to 5 which were derived from IEC 811-1 to IEC 811-5. Part 99 describes test methods having national applicabilit

11、y only.The International Eletrotechnical Commission has completed its comprehensive update of the test methods previously given in IEC 538, IEC 538A and IEC 540, which are now largely brought together in IEC 811. Electrical tests from IEC 540 have been incorporated into IEC 885. The technical change

12、s introduced during this update, and endorsed by CENELEC in HD 505, are now included in BS 6469.BS 6469-4.2 includes a number of test methods described in BS 6234. Other test methods from BS 6234, from BS 6746 and from BS 6899 have been incorporated in BS 6469-99. The status of these test methods in

13、 BS 6234, BS 6746 and BS 6899 will be reviewed separately.BS 6469 describes methods of test, but does not specify requirements for products or materials. These will be specified in the relevant cable standards or cable material standards.This Section of BS 6469 details the electrical tests previousl

14、y specified in BS 6469:1990 which have not been included in CENELEC Harmonization Document HD 505. These test methods are called up in various electric cable specifications for non-harmonized national types.It has been assumed in the preparation of this British Standard that the execution of its pro

15、visions will be entrusted to appropriately qualified and experienced people, for whose use it has been produced.WARNING. The methods of test described in this British Standard do not necessarily detail all precautions necessary to meet the requirements of the Health and Safety at Work etc. Act 1974.

16、 Attention should be paid to any appropriate safety precautions and the tests should be carried out only by trained personnel.Cross-references between the relevant clauses in BS 6469:1990 and those in BS 6469-1 to BS 6469-5 and BS 6469-99 are given in Appendix A. Tests included in BS 6469-1.3 and BS

17、 6469-5.1 which were not given in BS 6469:1990 are listed in Appendix B.A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application.Compliance with a British Standard does not of itself confer imm

18、unity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 5 and a back cover.This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on Fore

19、wordThis Section of BS 6469 has been prepared under the direction of the Cables and Insulation Standards Policy Committee. BS 6469-1 to BS 6469-5 and BS 6469-99 BSI 23 January 2006the inside front cover.BS 6469-99.2:19921 ScopeBS 6469 specifies the test methods to be used for testing polymeric insul

20、ating and sheathing materials of electric cables.This Section of BS 6469 gives methods for electrical tests not included in the CENELEC Harmonization Document HD 505, and hence not given in BS 6349-1 to BS 6349-5.The methods of test described in this Section of BS 6469 are as follows:a) a test for i

21、nsulation resistance constant (K value);b) a test for power factor and permittivity;c) a capacitance test for water absorption of insulation.NOTE The titles of the publications referred to in this standard are listed on the inside back cover.2 Test valuesFull test conditions (such as temperatures an

22、d durations) and full test requirements are not specified in this standard; it is intended that they should be specified by the standard dealing with the relevant type of cable.Any test requirements which are given in this standard may be modified by the relevant cable standard to suit the needs of

23、a particular type of cable.3 ApplicabilityConditioning values and testing parameters are specified for the most common types of insulating and sheathing compounds and of cables, wires and cords.4 Type tests and other testsThe test methods described in this standard are suitable to be used for type t

24、ests. In certain tests, where there are essential differences between the conditions for type tests and those for more frequent tests, such as routine tests, these differences are indicated.5 SamplingFor multicore cables and cords, not more than three cores (of different colours, if any) shall be te

25、sted unless otherwise specified in the relevant cable standard.6 Pre-conditioning and test temperatureAll the tests shall be carried out not less than 16 h after the extrusion or vulcanization (or cross-linking), if any, of the insulating or sheathing compounds.Unless otherwise specified, tests shal

26、l be made at room temperature.NOTE In the UK room temperature is defined as 20 5 C.7 DefinitionsFor the purposes of this Section of BS 6469, the definitions given in BS 4727-2:Group 08 apply.8 Method of test for insulation resistance constant (K value)8.1 Test on coreRemove the sheath and any other

27、covering or filling for a length of at least 5 m, taking care not to damage the insulation.When specified in the relevant standard, condition the core by immersion in water for 12 h to 16 h at a temperature of 20 5 C, with a length of about 250 mm at each end of the core projecting above the water.I

28、mmediately after the conditioning period, immerse the core in water at the temperature stated in the relevant standard. After immersion for 120 10 min, apply a voltage between 300 V d.c. and 500 V d.c. between the conductor and the water. Measure the insulation resistance 1 min after the application

29、 of the voltage.Calculate the insulation resistance constant (K value, in M7km) from the equation:where8.2 Test on PVC sheathFor the test piece use a sheet 1.00 0.15 mm thick and large enough to accommodate the electrodes, moulded from the sheath at a temperature between 140 C and 160 C or obtained

30、by milling DdlRis the diameter (in mm) over insulation;is the diameter (in mm) over conductor;is the immersed length (in m) of core;is the insulation resistance (in M7) of the length of core.KlR1 000 log10Dd()-= BSI 23 January 2006 1the material at a suitable temperature between 130 C and 160 C for

31、the minimum time required to form a continuous and homogeneous sheet.BS 6469-99.2:1992Immerse the test piece in water for at least 12 h at a temperature of 20 5 C.Measure the insulation resistance in air in accordance with BS 2782: Method 230A at a temperature of 20 1 C.Calculate the insulation resi

32、stance constant (K value; in M7km) from the equation:where9 Method of test for power factor and permittivityTake samples of core of length not less than 5 m, from the complete cable and immerse them in water for 24 h at room temperature with a length of about 250 mm at each end of the core projectin

33、g above the water. Measure the power factor and capacitance of the insulation between the conductor and the water with suitable equipment at any convenient frequency between 40 Hz and 62 Hz, at the rated voltage to earth, Uo, of the cable and at a temperature 20 1 C.Calculate the permittivity from t

34、he equation:where10 Water absorption determined by the capacitance method10.1 Preparation of test specimenTake a sample of the core about 4.5 m long, after vulcanization but before the application of any covering except tape applied before vulcanization. Wherever possible remove any tape before the

35、test. Prepare the test specimen from the sample not less than 48 h after vulcanization, by drying for 24 h in air at 70 5 C. Allow the test specimen to cool to approximately 50 C before immersion in the water.10.2 Immersion of specimenPlace the test specimen in a water tank so that its middle portio

36、n for a length of 3 m is immersed, whilst each end is above the water level for a length of 0.75 m. Maintain the water at a temperature of 50 1 C for 14 days. Place a tightly fitting cover directly above the water surface with suitable watertight bushings for the ends of the test specimen and keep t

37、he water level constant.10.3 Electrical measurementsCarry out the test with one of the following voltages:a) an average stress at any frequency from 40 Hz to 62 Hz inclusive, of:800 V/mm for insulation types GP1, FR1, OR1, and GP4, to BS 6899,2 500 V/mm for insulation type FR2, to BS 6899,3 200 V/mm

38、 for insulation types GP2 and GP5 to BS 6899;b) a low voltage at any frequency from 800 Hz to 1 000 Hz inclusive.Measure the capacitance after continuous immersion for 1, 7 and 14 days checking that the water is at the same temperature for all measurements.Express the increase in capacitance from 1

39、day to 14 days and from 7 days to 14 days as percentages of the 1-day and the 7-day values respectively.RAtis the measured resistance of sheet (in M7);is the area of electrode (in mm2);is the thickness of sheet (in mm), taken to the nearest 0.05 mm.C Ddlis the permittivity of the insulation;is the m

40、easured capacitance (in nF) of the sample;is the diameter (in mm) over insulation;is the diameter (in mm) over conductor;is the immersed length (in m) of core.K3.66 107 R At-=41.4C log10Dd()l-=2 BSI 23 January 2006BS 6469-99.2:1992Appendix A Corresponding clauses or subclauses in BS 6469:1990 and BS

41、 6469:1992Table 1 Corresponding clauses or sub-clauses in BS 6469:1990 and BS 6469:1992Clause in BS 6469:1990 BS 6469:1990 BS 6469:1992Clause or sub-clausePart Section Clause or sub-clauseGeneralMeasurement of thicknesses and diametersDetermination of tensile strength and elongation at breakThermal

42、ageing methodsMethods for determining densityShrinkage testGravimetric water absorption testGreen/yellow proportionsMineral oil immersion testOzone resistance testHot set testTear resistanceLoss of mass testsPressure tests at high temperatureTests at low temperatureTests for resistance to crackingHo

43、t deformation testThermal stability test for insulations and sheathsDetermination of melt flow index (MFI)Test for resistance to environmental stress cracking: Original granulesTest for resistance to environmental stress cracking: Complete cableCarbon black contentCarbon black dispersionaWrapping te

44、st after thermal ageingb1.1 to 1.32.12.22.32.42.52.62.73.13.23.33.44.14.24.34.44.54.65.15.2.25.2.35.3.25.3.35.41 to 4 and 995111111992229933139934499444All5.11.11.11.21.31.31.399.12.12.12.199.13.23.11.43.199.13.24.14.199.14.14.14.21 to 71 to 38988109.281089988891091081111910a Methods given in BS 278

45、2:Methods 823A or 823B.b It is intended that a formal proposal to IEC will result in the test in clause 9 of Section 4.1 being withdrawn. BSI 23 January 2006 3BS 6469-99.2:1992Appendix B Tests included in BS 6469:1992 not previously coveredTable 2 Tests included in BS 6469:1992 not previously covere

46、dTest Part Section ClauseWater absorption test: electrical 1 1.3 9.1Tests specific to filling compounds:Drop-pointSeparation of oilLow temperature brittlenessTotal acid numberAbsence of corrosive componentsPermittivity at 23 CD.C. resistivity at 23 C and 100 CDetermination of linear swell after agei

47、ng in oilAlternative ozone resistance test method (low concentration)Method of test for insulation resistance constant (K value)Method of test for power factor and permittivityWater absorption determined by the capacitance method555555599999999995.15.15.15.15.15.15.199.199.199.299.299.24567891012138

48、9104 BSI 23 January 2006BS 6469-99.2:1992Publication(s) referred toBS 2782, Methods of testing plastics. BS 2782-2, Electrical properties. BS 2782:Method 230A, Determination of volume resistivity. BS 2782-8, Other properties. BS 2782:Methods 823A and 823B, Methods for the assessment of carbon black

49、dispersion in polyethylene using a microscope. BS 4727, Glossary of electrotechnical, power, telecommunication, electronics, lighting and colour terms. BS 4727-2, Terms particular to power engineering. BS 4727:Group 08, Electric cable terminology. BS 6234, Specification for polyethylene insulation and sheath of electric cables1). BS 6746, Specification f