BS-EN-50395-2005.pdf
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1、BRITISH STANDARD BS EN 50395:2005 Electrical test methods for low voltage energy cables The European Standard EN 50395:2005 has the status of a British Standard ICS 29.060.20 ? BS EN 50395:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on
2、14 November 2005 BSI 14 November 2005 ISBN 0 580 46737 6 National foreword This British Standard is the official English language version of EN 50395:2005. The UK participation in its preparation was entrusted by Technical Committee GEL/20, Electric cables, to Subcommittee GEL/20/17, Low voltage cab
3、les, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue und
4、er the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct app
5、lication. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; moni
6、tor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 14, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates whe
7、n the document was last issued. Amendments issued since publication Amd. No. DateComments EUROPEAN STANDARD EN 50395 NORME EUROPENNE EUROPISCHE NORM August 2005 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elek
8、trotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50395:2005 E ICS 29.060.20 Partly supersedes HD 21.2 S3:1997 + A1:2002 it is intended that they
9、should be specified by the standard dealing with the relevant type of cable. Any test requirements which are given in this European Standard may be modified by the relevant cable standard to suit the needs of a particular type of cable. 4 Definitions For the purposes of this document, the following
10、terms and definitions apply. 4.1 median value when several test results have been obtained and ordered in an increasing or decreasing succession, the median value is the middle value if the number of available values is odd, and is the mean of the two middle values if the number is even 5 Electrical
11、 d.c. resistance of conductor The test shall be carried out in accordance with Annex A of EN 60228. 6 Voltage test on completed cable If the cable has no metallic layer, a sample of the cable as manufactured shall be immersed in water. The length of the sample, the temperature of the water and the p
12、eriod of immersion shall be as specified in the cable standard. A voltage shall be applied between conductor(s) and groups of conductors in such a way that the insulation on each core is tested against all adjacent cores and the water. 7 EN 50395:2005 If the cable has a metallic layer, a sample of t
13、he cable shall be taken of the length specified in the cable standard. A voltage shall be applied between conductor(s) and groups of conductors in such a way that the insulation on each core is tested against all adjacent cores and the metallic layer, which shall be earthed. If the cable has a metal
14、lic strain-bearing member, this shall be connected to the water or to the metallic layer, as appropriate. In each case, the voltage and the duration of its application shall be as specified in the cable standard. The voltage shall be increased gradually on each occasion to the specified value. No br
15、eakdown of the insulation shall occur during the test. 7 Voltage test on cores in water The test applies to sheathed cables, braided cables and flat unsheathed cords. NOTE For 1-core unsheathed cables, the test in Clause 6 generally applies, in which case this test on cores is not required. 7.1 Test
16、 sample Prepare a sample of cable 5 m long, by carefully removing, without damaging the cores, the sheath or the overall braid and any other covering or filling from a length of completed cable. In the case of flat unsheathed cord, make a cut in the insulation between the cores, and separate the cor
17、es by hand for a length of 2 m. 7.2 Procedure Immerse the sample in water at the temperature, and for the period, specified in the cable standard. Ensure that the ends of the cores protrude above the water by a distance sufficient to prevent excessive surface leakage when the test voltage is applied
18、. Apply a voltage, of the magnitude specified in the cable standard, between the conductors and the water for the time specified in the cable standard. 7.3 Requirement No breakdown of the insulation shall occur during the test. 8 Insulation resistance test 8.1 Insulation resistance for cables having
19、 maximum conductor temperatures not exceeding 90 C 8.1.1 Test sample Make the test on a sample of cable 5 m long, previously submitted to the test specified in Clause 7 or, in the case of 1-core unsheathed cable, to the test described in Clause 6. EN 50395:2005 8 8.1.2 Procedure Immerse the sample i
20、n water previously heated to the temperature specified in the cable standard, with a length of about 250 mm at each end of the sample projecting above the water, for the period of time specified in the cable standard. Apply a d.c. voltage of between 80 V and 500 V between each conductor and the wate
21、r. Measure the insulation resistance of each core 1 min after application of the voltage. Use this value to calculate the insulation resistance of a 1 km length of each core. 8.1.3 Requirement None of the resulting values shall be below the minimum insulation resistance value specified in the cable
22、standard. 8.2 Insulation resistance for cables with maximum conductor temperatures exceeding 90 C NOTE Further basic information on this test method may be obtained from HD 429, Clause 6 “Test pieces for the volume resistivity measurement”. 8.2.1 Test sample Make the test on the same sample of cable
23、 used for the voltage test in Clause 7 or, in the case of 1-core unsheathed cable, to the test described in Clause 6. 8.2.2 Procedure Cut a test piece 1,40 m long from the cable or core to be tested. Cover this test piece with a semi- conducting layer, and over this layer apply a metal braid or a me
24、tal tape in such a way as to obtain an active measuring length of 1,0 m. At both ends of the active measuring length, leaving a gap 1 mm wide, apply a protective wire binding of approximately 5 mm length (see Figure 1). Wind the test piece to form a ring with a diameter of approximately 15D but at l
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