1、Test requirements for lowvoltage aerial bundledcable accessories Part 5: Electrical ageing testBS EN 50483-5:2009raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsNational forewordThis British Standard is the UK implementation of EN
2、 50483-5:2009.The UK participation in its preparation was entrusted by Technical CommitteeGEL/20, Electric cables, to Subcommittee GEL/20/11, Cable accessories.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to includ
3、e all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2009ISBN 978 0 580 56181 8ICS 29.240.20BRITISH STANDARDBS EN 50483-5:2009Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the a
4、uthority of the StandardsPolicy and Strategy Committee on 31 March 2009Amendments issued since publicationAmd. No. Date Text affectedEUROPEAN STANDARD EN 50483-5 NORME EUROPENNE EUROPISCHE NORM January 2009 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisatio
5、n Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: avenue Marnix 17, B - 1000 Brussels 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50483-5:2009 E ICS 29.240.20 English version Test re
6、quirements for low voltage aerial bundled cable accessories - Part 5: Electrical ageing test Prescriptions relatives aux essais des accessoires pour rseaux ariens basse tension torsads - Partie 5: Essai de vieillissement lectriquePrfanforderungen fr Bauteile fr isolierte Niederspannungsfreileitungen
7、 - Teil 5: Elektrische Alterungsprfungen This European Standard was approved by CENELEC on 2008-12-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterati
8、on. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by trans
9、lation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Fi
10、nland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 50483-5:2009EN 50483-5:2009 2 Foreword This European Standard was p
11、repared by a sub-group of WG 11 of the Technical Committee CENELEC TC 20, Electric cables. The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50483-5 on 2008-12-01. The following dates were fixed: latest date by which the EN has to be implemented at national lev
12、el by publication of an identical national standard or by endorsement (dop) 2009-12-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2011-12-01 This is Part 5 of CENELEC standard EN 50483 “Test requirements for low voltage aerial bundled cable accesso
13、ries”, which has six parts: Part 1: Generalities; Part 2: Tension and suspension clamps for self supporting system; Part 3: Tension and suspension clamps for neutral messenger system; Part 4: Connectors; Part 5: Electrical ageing test; Part 6: Environmental testing. _ BS EN 50483-5:2009 3 EN 50483-5
14、:2009 Contents 1 Scope . 4 2 Normative references . 4 3 Terms and definitions . 5 4 Symbols . 7 5 Type test 8 5.1 Principle 8 5.2 Test arrangement 8 5.3 Test specimen . 11 5.4 Measurement 13 5.5 Heat cycle . 15 5.6 Requirements 19 Annex A (normative) Equalizers . 29 Annex B (informative) Determinati
15、on of the value of the short-circuit current 31 Annex C (informative) Recommendations to improve accuracy of measurement 32 Bibliography 33 Figures Figure 1 Lengths and configurations of conducting paths . 10 Figure 2 Location of thermocouples . 14 Figure 3 First heat cycle 17 Figure 4 Use of a conc
16、entric return conductor 18 Figure 5 Test loop for branch connectors with main and branch conductors having equal cross-sections and linear resistances . 24 Figure 6 Test loop for branch connectors with main and branch conductors having unequal cross-sections and linear resistances . 25 Figure 7 Test
17、 loop for through connectors with conductors having equal or unequal cross-sections and linear resistances. 26 Figure 8 Test loop for pre-insulated lugs 28 Figure A.1 Equalizers. 30 Figure B.1 Diagram of short-circuit current . 31 Tables Table 1 Conducting path lengths 11 Table 2 Testing cross-secti
18、ons of main and branch conductors 12 Table 3 Minimum elevated current heating time . 16 Table 4 Test requirements . 23 Table A.1 Dimensions of equalizers . 29 BS EN 50483-5:2009EN 50483-5:2009 4 1 Scope EN 50483 series applies to overhead line fittings for tensioning, supporting and connecting aeria
19、l bundled cables (ABC) of rated voltage U0/U (Um): 0,6/1 (1,2) kV. This Part 5 applies to the connections described in EN 50483-4, including branch connectors, Insulation Piercing Connectors (IPC), pre-insulated lugs (terminals) and through pre-insulated connectors (sleeves). The objective is to pro
20、vide a method of testing the suitability of connectors when used under normal operating conditions with low voltage aerial bundled cables complying with HD 626. Two classes of connectors are covered by this standard: Class A: These are connectors intended for electricity distribution or industrial n
21、etworks in which they can be subjected to short-circuits of relatively high intensity and duration. As a consequence, Class A connectors will be suitable for the majority of applications. Class B: These are connectors for networks in which overloads or short-circuits are rapidly cleared by the opera
22、tion of protection devices. Depending on their application, the connectors are subjected to heat cycles and short-circuit current tests. Class A: the connectors are subjected to heat cycles and short-circuit current tests. Class B: the connectors are subjected to heat cycles only. The object of this
23、 Part 5 is to define the heating cycles test methods and requirements which apply to compression through connectors, insulation piercing connectors and all other type of connections for low voltage aerial bundled cables. NOTE This European Standard does not invalidate existing approvals of products
24、achieved on the basis of national standards and specifications and/or the demonstration of satisfactory service performance. However, products approved according to such national standards or specifications cannot directly claim approval to this European Standard. It may be possible, subject to agre
25、ement between supplier and purchaser, and/or the relevant conformity assessment body, to demonstrate that conformity to the earlier standard can be used to claim conformity to this standard, provided an assessment is made of any additional type testing that may need to be carried out. Any such addit
26、ional testing that is part of a sequence of testing cannot be done separately. 2 Normative references The 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 ref
27、erenced document (including any amendments) applies. EN 50483 series, Test requirements for low voltage aerial bundled cable accessories EN 61238-1:2003, Compression and mechanical connectors for power cables for rated voltages up to 36 kV (Um= 42 kV) Part 1: Test methods and requirements (IEC 61238
28、-1:2003, mod.) IEC 60050-461, International Electrotechnical Vocabulary (IEV) Part 461: Electric cables BS EN 50483-5:2009 5 EN 50483-5:2009 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60050-461 and the following apply. 3.1 adiabatic occurring wi
29、th no addition or loss of heat from the system under consideration 3.2 aerial bundled cable (ABC) aerial cable consisting of a group of insulated conductors which are twisted together including, or not, a non insulated conductor IEV 461-08-02, modified NOTE The terms bundled conductors, bundled cabl
30、es, bundled cores, conductor bundles and bundle could be used as equivalent to the term aerial bundled cable (ABC). 3.3 aerial-insulated-cable insulated cable designed to be suspended overhead and outdoors IEV 461-08-01 3.4 branch connector metallic device for connecting a branch conductor to a main
31、 conductor at an intermediate point on the latter IEV 461-17-05 3.5 branch conductor conductor connected to the main conductor by a connector 3.6 conductor insulation insulation applied on a conductor IEV 461-02-02, modified 3.7 conductor (of a cable) part of a cable which has the specific function
32、of carrying current IEV 461-01-01 3.8 connector metallic device to connect cable conductors together IEV 461-17-03 3.9 core assembly comprising conductor and its own insulation IEV 461-04-04, modified 3.10 equalizer arrangement used in the test loop to ensure a point of equipotential in a stranded c
33、onductor EN 61238-1:2003, 3.8 BS EN 50483-5:2009EN 50483-5:2009 6 3.11 insulation (of a cable) insulating materials incorporated in a cable with the specific function of withstanding voltage IEV 461-02-01 3.12 insulation piercing connector (IPC) connector in which electrical contact with the conduct
34、or is made by metallic protrusions which pierce the insulation of the ABC core IEV 461-11-08, modified 3.13 median connector connector which during the first heat cycle records the third highest temperature of the six connectors in the test loop EN 61238-1:2003, 3.11 3.14 pre-insulated (terminal) lu
35、g insulated metallic device for connecting an insulated cable conductor to other electrical equipment 3.15 pre-insulated through connector (sleeve) insulated metallic device for connecting two consecutive lengths of insulated conductors 3.16 reference conductor length of conductor(s) without any joi
36、nts, which is included in the test loop and which enables the reference temperature and reference resistance(s) to be determined 3.17 reusable connector connector for connecting ABC to stripped cable or bare conductor where only the branch connection can be reused 3.18 sheath uniform and continuous
37、tubular covering of metallic or non metallic material, generally extruded IEV 461-05-03 3.19 shear head head of a bolt, or a device fitted over the head of a bolt or a nut, which is designed to break at a specified torque 3.20 type test test required to be made before supplying a type of material co
38、vered by this standard on a general commercial basis, in order to demonstrate satisfactory performance characteristics to meet the intended application NOTE These tests are of such a nature that, after they have been made, they need not be repeated unless changes are made to the accessory materials,
39、 design or type of manufacturing process which might change the performance characteristics. BS EN 50483-5:2009 7 EN 50483-5:2009 4 Symbols A, A1, A2electrical cross-sectional area of the conductors D conductor diameter DEqequalizer diameter d conductor length between connectors I direct current flo
40、wing through a connection during resistance measurement Irmsequivalent r.m.s. short-circuit current INalternating current necessary to maintain the reference conductor at its equilibrium temperature la, lb, ljlengths of the conductor assembly associated with the measurement points after jointing le
41、length of equalizer lr,lra, lrblength of the reference conductor between measurement points R1, R2linear resistance of conductors of respectively cross-section A1 and A2 R20, Rra, Rrb the calculated resistance between two equalizers and corrected to 20 C TC thermocouple t1heating period within heat
42、cycle t2cooling period within heat cycle t1-a time period to reach the required temperature on the reference cable t1-btime period of stable temperature on the median connector UABpotential difference between measurement points of reference conductor of cross-section A1 UCDpotential difference betwe
43、en measurement points of the connector UEF potential difference between measurement points of reference conductor of cross-section A2 temperature coefficient of resistance at 20 C mean scatter of the connector resistance factors jtemperature difference between reference cable and connector initial s
44、catter of the connector resistance factors BS EN 50483-5:2009EN 50483-5:2009 8 resistance factor ratio; change in the resistance of the connector relative to its initial resistance temperature of a connector while measuring resistances maxmaximum temperature recorded on a connector over the total pe
45、riod of test Nhighest rated temperature of insulating compound in normal operation Rtemperature of the reference conductor determined in the first heat cycle rtemperature of the reference conductor while measuring resistances reftemperature of the reference conductor at the moment of measuring max 5
46、 Type test 5.1 Principle Connectors shall be subjected to 1 000 cycles of heating and cooling. The cold resistance of the connectors shall be measured at specific steps to determine their suitability when used with conductors carrying a load. Heat cycle and, short-circuit tests shall be made with al
47、ternating current. NOTE Direct current may be used for heat cycle only when agreed between customer and manufacturer. 5.2 Test arrangement 5.2.1 Installation The test circuit shall be as shown in Figure 5, 6, 7 or 8. Figures 5, 6, 7 and 8 represent the test circuits respectively for main and branch
48、connectors having equal cross-sections and linear resistance(s); for main and branch connectors having unequal cross-sections and linear resistance(s); for through connectors having equal or unequal cross-sections and linear resistance(s); for terminal lugs. 5.2.1.1 Optional immersion test EN 50483-
49、6, 8.4.3.1 provides an optional immersion test for samples which are intended for use in saline polluted areas. When the inclusion of this test has been agreed between the manufacturer and the customer this heat cycle test shall be modified to accommodate immersion of the test samples during each cycle. 5.2.2 Disconnection devices The test circuit may include sectioning joints so that it can be dismantled and short-circuit tes
