1、BRITISH STANDARD BS EN50395:2005Electrical test methodsfor low voltage energycables ICS 29.060.20nullnull nullnullnullnullnullnullnull nullnullnullnullnullnullnull nullnullnull nullnullnullnullnullnullnullnullnullnull nullnullnullnullnullnull nullnull nullnullnullnullnullnullnullnullnull nullnull nu
2、llnullnullnullnullnullnullnullnull nullnullnull+ A1 :201 1 National forewordThis British Standard is the UK implementation of EN 50395:2005+A1:2011. It supersedes BS EN 50395:2005, which is withdrawn.The start and finish of text introduced or altered by amendment is indicated in the text by tags. Ta
3、gs indicating changes to CENELEC text carry the number of the CENELEC amendment. For example, text altered by CENELEC amendment A1 is indicated by !“.The UK participation in its preparation was entrusted by Technical Committee GEL/20, Electric cables, to Subcommittee GEL/20/17, Electric Cables - Low
4、 voltage.A list of organizations represented on this subcommittee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer i
5、mmunity from legal obligations. BS EN 50395:2005+A1:2011This British Standard waspublished under the authorityof the Standards Policy andStrategy Committeeon 14 November 2005 BSI 2011ISBN 978 0 580 67085 5Amendments/corrigenda issued since publicationDate Comments 31 October 2011 Implementation of C
6、ENELEC amendment A1:2011EUROPEAN STANDARD EN 50395:2005+A1NORME EUROPENNEEUROPISCHENORMCENELECEuropean Committeefor Electrotechnical StandardizationComitEuropendeNormalisationElectrotechniqueEuropisches Komitee frElektrotechnischeNormungCentralSecretariat:ruedeStassart35,B-1050Brussels 2005 CENELEC-
7、 Allrightsofexploitationinany form and by any means reserved worldwidefor CENELECmembers.Ref.No. EN 50395:2005 EICS 29.060.20 Partly supersedes HD 21.2 S3:1997 +A1:2002 it is intended that theyshould be specified by the standard dealingwith therelevant typeofcable.Anytest requirements which aregiven
8、 in this European Standardmay be modifiedby therelevantcable standard to suit the needs of aparticular type of cable.4Definitions For the purposes of this document, the following terms and definitions apply.4.1medianvaluewhen several test results have been obtainedand orderedinanincreasingordecreasi
9、ng succession,the median value is the middlevalueif the number of available values is odd, andis themean of thetwo middle values if the number is even5Electricald.c.resistanceofconductorThe test shallbecarried outinaccordancewithAnnex AofEN 60228.6 Voltage testoncompletedcableIf the cable has no met
10、allic layer, asample of the cableasmanufactured shall be immersed in water.Thelength of the sample, the temperatureof thewater and theperiodofimmersion shallbeasspecified in thecablestandard. Avoltage shallbeapplied betweenconductor(s)and groups ofconductorsinsuchaway that the insulationoneachcoreis
11、 testedagainst alladjacent cores and thewater.BS EN 50395:2005+A1:2011 EN 50395:2005+A1:2011 (E) 7 If the cablehas ametallic layer, asample of the cableshallbe taken of the length specified in thecable standard. Avoltage shall be applied betweenconductor(s)and groups of conductorsinsuchaway that the
12、insulationoneachcoreis tested against all adjacent coresand the metallic layer, whichshall be earthed.If the cable has ametallic strain-bearingmember, this shallbeconnected to the water or to themetallic layer, as appropriate.In eachcase, thevoltage and the durationofits applicationshallbeasspecifie
13、d in the cablestandard.Thevoltage shallbeincreased graduallyoneachoccasion to the specifiedvalue.No breakdown of the insulation shalloccurduring the test.7 Voltage testoncores inwaterThe test applies to sheathed cables,braided cables and flat unsheathed cords.NOTE For 1-core unsheathed cables, the t
14、est in Clause 6 generally applies, in whichcase this test oncoresisnot required.7.1TestsamplePrepare asample of cable5mlong, by carefully removing, without damaging the cores, the sheath orthe overallbraid andanyother covering or fillingfromalengthofcompleted cable.In the case of flat unsheathed cor
15、d,makeacut in theinsulation between thecores,and separate thecoresbyhandfor alengthof 2m.7.2 ProcedureImmerse the sample in water at the temperature, andfor the period, specified in the cablestandard.Ensure that the ends of the coresprotrude above the water by adistancesufficient to preventexcessive
16、 surfaceleakagewhen the test voltage is applied.Apply avoltage,of the magnitudespecified in thecable standard, between theconductors and thewater for the time specified in thecable standard.7.3 RequirementNo breakdown of the insulation shalloccurduring the test.8Insulationresistance test8.1Insulatio
17、n resistance for cables havingmaximum conductor temperatures not exceeding90C8.1.1 TestsampleMake the test onasample of cable 5mlong, previously submitted to the test specified in Clause 7or,in thecaseof1-core unsheathedcable, to the testdescribed in Clause 6.BS EN 50395:2005+A1:2011 EN 50395:2005+A
18、1:2011 (E)88.1.2 ProcedureImmerse the sample in water previously heated to the temperaturespecified in the cablestandard,with alength of about 250mmat eachend of the sample projecting above the water,for the periodoftimespecified in the cablestandard.Apply ad.c.voltage of between 80 Vand 500Vbetween
19、eachconductor and thewater.Measure the insulationresistanceofeachcore1minafter application of the voltage. Use this value tocalculate the insulationresistanceofa1kmlengthofeachcore.8.1.3 Requirement None of the resulting valuesshall be below theminimum insulationresistancevaluespecified in thecable
20、standard.8.2Insulationresistanceforcableswithmaximumconductor temperatures exceeding90CNOTE Further basic informationon this testmethod maybeobtained from HD 429,Clause 6“Test piecesfor thevolumeresistivity measurement”.8.2.1 TestsampleMake the teston thesamesample of cable used for the voltage test
21、inClause 7or, in thecaseof1-core unsheathed cable, to the test described in Clause 6.8.2.2 ProcedureCut a test piece1,40mlong from the cable or core to be tested. Cover this test piecewithasemi-conducting layer, andoverthis layerapply ametal braidorametal tapeinsuchawayas to obtain anactivemeasuring
22、 length of 1,0 m.At bothends of the activemeasuring length, leavingagap 1mmwide, applyaprotective wirebindingof approximately5mm length (see Figure1).Wind the test piece to form aringwithadiameterofapproximately15 D but at least 0,20 m( D =nominal outerdiameterofinsulation).Maintain the testpieceina
23、nair oven forat least 2 hat the test temperaturespecified in the relevantcable standard, leavingaclearancebetween thesample and thewalls of the air oven of at least 50 mm.After the conditioning period ad.c.voltage between80Vand 500Vshallbeappliedbetween theconductor and thescreen (semi-conductinglay
24、er and metal braid/metal tape including theprotectivewirebinding), thesample stillbeing kept in the air oven.Theinsulationresistanceshallbemeasured 1min after applicationof the voltageand thisvalueshallbe used tocalculate the insulationresistanceofa1kmlength of cable.8.2.3 Requirement None of the re
25、sulting valuesshall be below theminimum insulationresistancevalue specified in thecable standard.NOTE Annex Ashows thecalculation method forminimum insulation resistance.BS EN 50395:2005+A1:2011 EN 50395:2005+A1:2011 (E)9Key1guard electrode(protective wire binding) 2screenelectrodeFigure1Positioning
26、ofelectrodes 9Long termresistanceofinsulation tod.c.9.1TestsampleCarryout the testonasample of cable of 5mlengthfromwhich allcoverings havebeen removed.Thecores of flat unsheathedcords shallnot be separated.Forcables having up tofivecores,eachcoreshallbe tested. Formulticore cables having more thanf
27、ive cores, onecoreofeachcolour in thecable shallbe tested, andwhere the number of coloursisless than5,duplicate coloured coresshall be testedasnecessary tobring the number of cores testedup toaminimum of 5.Take care toavoid damage to thecore(s) duringremovalof the coverings.9.2 ProcedureImmerse the
28、sample, for theperiod andat the temperaturegiven in therelevant cable standard, in anaqueous solution of sodium chloridehavingaconcentrationof10g/l,with alengthofabout 250mmat eachend of the sample projecting above thesolution. Connect thenegativepole of a 220 Vd.c.supply to the conductor(s)of the s
29、ample and thepositivepole to acopper electrode immersed in thesolution for the timegiven in the relevant cable standard.BS EN 50395:2005+A1:2011 EN 50395:2005+A1:2011 (E)109.3 RequirementNo breakdown of the insulationshall occurduring the test and, after the test, the exteriorof theinsulation shalls
30、hownosignofdamage.NOTE Discoloration of theinsulationshouldbeignored.10 Checkfor theabsenceoffaultsininsulation10.1GeneralTest all cable that is in the finalstage of manufacture, whether it is in deliverylengths or inmanufacturinglengthsprior tobeingcut intodeliverylengths.Test singlecorecables,whet
31、her sheathed or unsheathed, by the spark test in accordancewith 10.2.Test all other cables,including sheathed flat cables, by the voltage test inaccordance with 10.3.Therequirements of 3.1 of this European Standarddonot applywhen thecheckfor absenceoffaultsis carried out as aRoutine (R) test.10.2 Sp
32、ark test10.2.1ProcedureCarry out the test according to , except that the option to use a pulsedwaveformhigh voltagesource is not permitted.10.2.2 RequirementNo faults shallbedetected during thetest.10.3 Voltage test10.3.1ProcedureWith the cable in thedry state and at ambient temperatureapply avoltag
33、e of the magnitude giveninthe relevant cablestandard, supplied either from an a.c.source or from ad.c.source,between eachconductor andall the other conductorsand, if any, the metallic layerconnected to earth.Increase the voltage graduallyand maintain it at thefull valuefor the durationgiven in there
34、levantcable standard.10.3.2 RequirementNo breakdown of the insulation shalloccurduring the test.EN 62230! “BS EN 50395:2005+A1:2011 EN 50395:2005+A1:2011 (E)1111 Surfaceresistanceof sheath11.1Testsamples Carryout the teston threesamples of completed cable, eachabout 250 mm in length.11.2 ProcedureCl
35、ean the sheath of eachof the samples with industrialmethylatedspirit, andapplytoeachsampletwo electrodes,consisting of wire helices of copper wire of between 0,2 mm and 0,6 mm diameter,at adistanceof(100 2)mmfromeachother.After the wirehas beenapplied, clean the surfaceof thesheath again thoroughlyb
36、etween the electrodes.Condition thesamples with electrodes attached in aconditioningchamber at a temperatureof(20 2) C andarelativehumidityof(65 5)%for 24 h.Immediately after removal from the conditioningchamber,apply ad.c.voltage of between 100Vand500 Vbetween theelectrodes, and measure the resista
37、nceafter 1min.Multiplythe measured resistanceofeachsample, in ohms, by a /100, where a is the circumferenceofthe sheath of the sample, in millimetres.Record the median of the three values so obtainedas thesurfaceresistance of the sheath.11.3 RequirementThemedian of the three values so obtainedshall
38、be not lower than thevalue in the cable standard.12 TransferimpedanceThe test shallbecarried outinaccordancewithEN50289-1-6, clause 6.NOTE EN 50289-1-6 is maintained by theTechnicalCommittee CENELECTC46X,Communicationcables.BS EN 50395:2005+A1:2011 EN 50395:2005+A1:2011 (E)12 Annex A(informative)Cal
39、culationofminimuminsulationresistanceA.1Basic formulaThegeneral basicformula is:nullnull= dDR log.100367,0 8where:R =insulation resistanceinM .kmnull =volumeresistivity in .md =the diameter of the bare conductor as giveninEN 60719Table 1(class1and class 2conductors) or Table 2(class5and class 6condu
40、ctors)D = d + twice the specified mean valueof the thicknessof the insulationand anymandatoryseparator betweenconductor andinsulation.A.2 RoundingAs the requirement in cablestandards is foraminimum value thecalculatedvalueof R should berounded down to twosignificant figures.A.3Examples ofcalculation
41、HD 21.3 S3,Table1,H07V-RConductorcross-sectionInsulationthickness Conductordiameter( d )OveralldiameterR R (rounded)mm mmmmmm M .kmM .km1,535500,7 1,2 1,41,457,08,2 2,859,411,00,010 77 0,004 6990,004 682 0,0100,004 60,004 6NOTE For many common insulation compounds, for instance those based on PVC or
42、 on thermoplastic polyolefines, the volume resistivity at the operating temperature of the relevant cable is assumed to be 810 m+ . In these cases the general formula reduces to: kmM log0,0367 = dDR !“BS EN 50395:2005+A1:2011 EN 50395:2005+A1:2011 (E)13 Annex B(informative)Source of electrical test
43、methods in EN50395Source(subclausenumber)TestHD 21.2 S3HD22.2 S3ClauseinEN50395Electrical resistanceof conductor2.1 2.15Voltage testoncompletedcable2.2 2.2 6 Voltage test on cores2.3 2.3 7Insulation resistance 2.4 2.48Long termresistanceof insulation to d.c.2.5 2.59Test to checkabsenceoffaults onins
44、ulation2.6 2.6 10Transfer impedance(Screening efficiency)2.7 -12 Surface resistanceofsheath2.8 2.7 11BS EN 50395:2005+A1:2011 EN 50395:2005+A1:2011 (E)14BibliographyThefollowing documents arereferred to in the text for information.HD 21.2 S3:1997 Cables of rated voltages up to andincluding 450/750 V
45、and havingthermoplastic insulation -Part 2: Test methodsHD 22.2 S3:1997 Cables of rated voltages up to andincluding 450/750 Vand having cross-linked insulation -Part 2:Test methodsHD 429Methods of test for volumeresistivityandsurface resistivityofsolid electricalinsulating materials (IEC 60093)HD 60
46、5Electric cables -Additional test methodsEN 50289SeriesCommunication cables -Specifications for test methodsBS EN 50395:2005+A1:2011 EN 50395:2005+A1:2011 (E)blankBSI GroupHeadquarters 389 Chiswick High Road, London, W4 4AL, UK Tel +44 (0)20 8996 9001 Fax +44 (0)20 8996 7001 standardsBSI - British
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