BS EN 60229-2008 Electric cables - Tests on extruded oversheaths with a special protective function《电缆 带特殊保护功能挤出护套的试验》.pdf

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1、BRITISH STANDARDBS EN 60229:2008Electric cables Tests on extruded oversheaths with a special protective functionICS 29.060.20g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g

2、53g44g42g43g55g3g47g36g58BS EN 60229:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2008 BSI 2008ISBN 978 0 580 58061 1National forewordThis British Standard is the UK implementation of EN 60229:2008. It is identical to IEC 60229

3、:2007.The UK participation in its preparation was entrusted by Technical Committee GEL/20, Electric cables, to Subcommittee GEL/20/16, Medium/high voltage cables.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to inc

4、lude all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARD EN 60229 NORME EUROPENNE EUROPISCHE NORM Ju

5、ne 2008 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2008 CENELEC - All rights of exploitation in any form and by any means r

6、eserved worldwide for CENELEC members. Ref. No. EN 60229:2008 E ICS 29.060.20 English version Electric cables - Tests on extruded oversheaths with a special protective function (IEC 60229:2007) Cbles lectriques - Essais sur les gaines extrieures extrudes avec fonction spciale de protection (CEI 6022

7、9:2007) Starkstromkabel -Prfungen an extrudierten Auenmnteln mit besonderer Schutzfunktion (IEC 60229:2007) This European Standard was approved by CENELEC on 2008-05-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Europ

8、ean Standard the status of a national standard without any alteration. 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 (Engl

9、ish, French, German). A version in any other language made by translation 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,

10、Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, 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. Forewo

11、rd The text of the International Standard IEC 60229:2007, prepared by IEC TC 20, Electric cables, was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 60229 on 2008-05-01 without any modification. The following dates were fixed: latest date by which the EN has to be imp

12、lemented at national level by publication of an identical national standard or by endorsement (dop) 2009-05-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2011-05-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the Internatio

13、nal Standard IEC 60229:2007 was approved by CENELEC as a European Standard without any modification. _ 2 BS EN 60229:2008CONTENTS 1 2 3 3.1 3.2 4 4.1 4.1.1 4.1.2 4.1.3 4.1.4 4.2 4.2.1 4.2.2 4.2.3 4.2.4 5 3 BS EN 60229:2008Scope.4 Normative references .4 Routine tests 4 D.C. voltage test .5 Spark tes

14、t5 Type tests 5 Abrasion test .5 Purpose.5 Test procedure 5 Inspection7 Performance requirement 7 Corrosion spread (aluminium metallic screen only)7 General .7 Test procedure 7 Inspection8 Performance requirement 8 Electrical test after installation8 Annex A (normative) Application of the abrasion t

15、est .9 Annex B (informative) Guidance on tests after installation .10 Figure 1 Abrasion test6 Table 1 Vertical force on steel angle 6 Table 2 Impulse test voltage 7 Annex ZA (normative) Normative references to international publications with their corresponding European publications.11ELECTRIC CABLE

16、S TESTS ON EXTRUDED OVERSHEATHS WITH A SPECIAL PROTECTIVE FUNCTION 1 Scope This International Standard provides a range of tests which may be required for electric cables which have an extruded oversheath and where that oversheath performs a special protective function. NOTE 1 The need for the speci

17、al functions may be independent of the nature of the insulation type or independent of the rated voltage of the cable. The standard covers cables for use in insulated systems and in uninsulated systems. The tests are categorized for use as a) routine tests, b) type tests, c) tests after installation

18、. These tests comprise: electrical routine tests on cable oversheath used in insulated or uninsulated systems, abrasion and corrosion spread type tests, electrical test on cable oversheath after installation. Routine tests and tests after installation, as specified in the relevant cable standards, a

19、re applicable for all situations. Type tests depend upon the nature of the system and the construction of the cable and do not have to be carried out for normal conditions of use. The application of the abrasion test is given in Annex A. NOTE 2 Guidance on tests after installation is given in Annex

20、B. 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 referenced document (including any amendments) applies. IEC 60230, Impulse test

21、s on cables and their accessories IEC 62230, Electric cables Spark test method 3 Routine tests The electrical integrity of the oversheath shall be tested using either a d.c. voltage test (3.1) or a spark test (3.2). 4 BS EN 60229:2008NOTE The spark test method is not applicable when a conducting lay

22、er is already applied to the oversheath. In such cases only the test according to 3.1 may be used. Testing is applicable in all cases. 3.1 D.C. voltage test A d.c. voltage of 8 kV per millimetre of the specified nominal thickness of the extruded oversheath shall be applied for 1 min between the unde

23、rlying metal layer at negative polarity and the outer conducting layer, subject to a maximum voltage of 25 kV. No breakdown of the oversheath shall occur during the test. NOTE The outer conducting layer may consist of a conductive layer applied to the extruded oversheath or obtained by immersion in

24、water for the duration of the test. 3.2 Spark test A spark test according to the method given in IEC 62230 shall be carried out by earthing the underlying metallic layer for an a.c. test or connecting it to the negative pole in the case of a d.c. supply. The voltages shall be 6 kV a.c. per millimetr

25、e or 9 kV d.c. per millimetre of the specified nominal thickness of the extruded oversheath, subject to maximum values of 15 kV a.c. and 25 kV d.c., respectively. The dwell time of the cable in the region of test shall be of sufficient duration to detect any defect. No faults shall be detected durin

26、g the test. 4 Type tests 4.1 Abrasion test 4.1.1 Purpose The purpose of this test is to demonstrate that the extruded oversheath will withstand abrasion during the laying operation. The abrasion test shall be carried out if the oversheath material is not of type ST1, ST2, ST3 or ST7 compound and if

27、the thickness does not comply with the particular IEC cable standard. 4.1.2 Test procedure A sample of the cable, of sufficient length, shall be submitted to the bending operation given in the bending test, as specified in the particular IEC cable standard. After bending, the procedure specified in

28、4.1.2.1 shall be carried out at a temperature of (20 5) C for cases a) and b), as described in Annex A. This shall be followed by the electrical test in 4.1.2.2 for case a) only. 4.1.2.1 Abrasion The sample of cable shall be laid out straight and horizontal on a firm base, with the plane of the prev

29、ious bending operation in the horizontal plane. In the middle of the sample and perpendicular to it, a length of mild steel angle shall be placed horizontally, at right angles to the cable, with its angle edge resting on the cable and with its arms symmetrical about the vertical plane through the lo

30、ngitudinal axis of the cable. The outer radius of curvature of the angle edge shall be not less than 1 mm and not greater than 2 mm (see Figure 1). 5 BS EN 60229:2008Dimensions in millimetres 2 AB13 600 min.IEC 2007/07 Key 1 force (see Table 1) A start/finish position 2 mild steel angle B finish/sta

31、rt position 3 plane of bending A-B test path length (minimum) Figure 1 Abrasion test The steel angle shall be vertically loaded, above the point of contact, with a force in accordance with Table 1. The steel angle shall be dragged horizontally along the cable for a distance not less than 600 mm at a

32、 speed of between 150 mm/s and 300 mm/s. The direction of movement shall be reversed at the end of each pass to give 50 passes, 25 in each direction over the 600 mm test path. Table 1 Vertical force on steel angle Overall measured diameter of cable mm Above and including Up to Force N 30 40 50 60 70

33、 80 90 100 40 50 60 70 80 90 100 110 65 105 155 210 270 340 420 500 110 and above 550 6 BS EN 60229:20084.1.2.2 Electrical test The middle of the cable sample, conditioned as above, shall be submerged at ambient temperature in a 0,5 % by weight solution of sodium chloride in water containing approxi

34、mately 0,1 % by weight of a suitable non-ionic surface active agent. After at least 24 h of constant immersion, a d.c. voltage of 20 kV shall be applied for a period of 1 min between the saline solution and the underlying metal layer which shall be at negative polarity. With the middle of the cable

35、still submerged at ambient temperature in the sodium chloride solution, apply 10 positive, followed by 10 negative impulse voltages, in accordance with IEC 60230, and Table 2: Table 2 Impulse test voltage Rated lightning impulse withstand voltage of main insulation voltage (peak) kV Impulse test vol

36、tage (peak) kV V 325 325 V 750 750 V 1 175 1 175 V 1 550 V 1 550 30 37,5 47,5 62,5 72,5 4.1.3 Inspection The cable sample shall be taken (from the solution if test following 4.1.2.2 is performed) and a 1 m length, which includes the abraded area of the extruded oversheath, shall be removed, employin

37、g two longitudinal cuts which do not pass through the conditioned area. The test sample shall be cleaned of foreign material. 4.1.4 Performance requirement The oversheaths shall be deemed satisfactory provided that a) the electrical test has been passed, where required, and b) an examination of the

38、sample with normal or corrected vision without magnification reveals no cracks or splits in the internal and external surfaces. 4.2 Corrosion spread (aluminium metallic screen only) 4.2.1 General The corrosion spread test is relevant in the case of aluminium wires, aluminium sheaths and aluminium fo

39、ils when not bonded to the oversheath. It is not applicable in the case of aluminium sheaths or foils bonded to the oversheath. The purpose is to demonstrate that, in the event of local damage to an oversheath, any consequential corrosion of the outer surface of the aluminium screen will remain virt

40、ually confined to the damaged area of covering. 4.2.2 Test procedure a) Bending operation A sample of cable shall be submitted to the bending procedure of the bending test, as specified in the particular IEC cable standard. 7 BS EN 60229:2008b) Local damage The oversheath shall be punctured down to

41、the aluminium sheath or wires, in four places, by means of a core drill of 10 mm diameter. These four holes shall be arranged spirally about the mid-portion of the cable sample, at longitudinal intervals of about 100 mm and circumferential spacings of 90. All material shall be removed from each hole

42、 to expose the 10 mm diameter of bare aluminium. c) Corrosion procedure The sample shall be formed into a U-shape with the curved portion having a radius of curvature not greater than specified in the bending operation above. The curved portion shall be submerged in a 1 % solution of sodium sulphate

43、 in water at ambient temperature, with the cable ends in the air. All four holes shall be submerged to a depth of at least 500 mm in the solution. With a d.c. voltage applied between the metallic screen and the solution and with metallic screen at negative polarity, a current of 10 mA shall flow for

44、 a total period of (100 2) h. This value of current shall be maintained substantially constant. This may be achieved by the inclusion of a series resistor, resistance value of about 10 k, in the electrical circuit. If two or more samples are electrically tested simultaneously, each sample shall be i

45、ndependently controlled (for example by being connected through its own series resistor). 4.2.3 Inspection The cable sample shall be taken from the solution and the oversheath removed for a length of about 500 mm, extending to at least 100 mm beyond each of the outer holes. All other material in thi

46、s region shall be removed from the metallic screen to expose bare aluminium. 4.2.4 Performance requirement The oversheath shall be deemed satisfactory provided that, by examination with normal or corrected vision without magnification, there are no signs of corrosion extending more than 10 mm beyond

47、 the rim of any hole at any point. 5 Electrical test after installation Where an after installation test of the oversheath is performed, a d.c. voltage of 4 kV per millimetre of specified thickness of extruded oversheath shall be applied with a maximum of 10 kV d.c. between the underlying metallic l

48、ayers and the outer electrode, for a period of 1 min. All metallic layers under the oversheath shall be connected together. This test requires that the oversheath has an outer “electrode” which may be moist backfill or a conductive layer. No breakdown of the oversheath shall occur during the test. 8

49、 BS EN 60229:2008Annex A (normative) Application of the abrasion test A.1 Case a) where the oversheath is to act as an insulation: i) where special metallic screen bonding is employed to reduce metallic sheath or screen losses, resulting in an applied voltage to the oversheath under load and fault conditions; ii) where the underlying metallic layer can be isolated from earth to permit a voltage to be applied to the oversheath to check its integrity. A.2 Case b) where the oversheath is