IEC 60502-2-2014 Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um = 1 2 kV) up to 30 kV (Um = 36 kV) - Part 2 Cables for rated voltages .pdf

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1、 IEC 60502-2 Edition 3.0 2014-02 REDLINE VERSION Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um = 1,2 kV) up to 30 kV (Um = 36 kV) Part 2: Cables for rated voltages from 6 kV (Um = 7,2 kV) up to 30 kV (Um = 36 kV) IEC 60502-2:2014-02 RLV(en) colour insid

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11、.0 2014-02 REDLINE VERSION Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um = 1,2 kV) up to 30 kV (Um = 36 kV) Part 2: Cables for rated voltages from 6 kV (Um = 7,2 kV) up to 30 kV (Um = 36 kV) INTERNATIONAL ELECTROTECHNICAL COMMISSION RP ICS 29.060.20 PRI

12、CE CODE CODE PRIX ISBN 978-2-8322-1457-2 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 2 60502-2:2014 RLV IEC:2014 CONTENTS CONTENTS 2 FOREWORD . 10 1 Scope 12 2 Normative refe

13、rences . 12 3 Terms and definitions 14 3.1 Definitions of dimensional values (thicknesses, cross-sections, etc.) 14 3.2 Definitions concerning the tests 15 4 Voltage designations and materials 15 4.1 Rated voltages . 15 4.2 Insulating compounds. 16 4.3 Sheathing compounds 17 5 Conductors 18 6 Insula

14、tion . 18 6.1 Material 18 6.2 Insulation thickness 18 7 Screening 19 7.1 General 19 7.2 Conductor screen . 20 7.3 Insulation screen 20 8 Assembly of three-core cables, inner coverings and fillers 20 8.1 General 20 8.2 Inner coverings and fillers 20 Construction . 20 8.2.1Material 20 8.2.2Thickness o

15、f extruded inner covering 20 8.2.3Thickness of lapped inner covering . 21 8.2.4 8.3 Cables having a collective metallic layer (see Clause 9) 21 8.4 Cables having a metallic layer over each individual core (see Clause 10) . 21 9 Metallic layers for single-core and three-core cables 21 10 Metallic scr

16、een. 22 10.1 Construction . 22 10.2 Requirements . 22 10.3 Metallic screens not associated with semi-conducting layers . 22 11 Concentric conductor . 22 11.1 Construction . 22 11.2 Requirements . 22 11.3 Application . 22 12 Metallic sheath . 23 12.1 Lead sheath . 23 12.2 Other metallic sheaths 23 13

17、 Metallic armour 23 13.1 Types of metallic armour 23 13.2 Materials 23 60502-2:2014 RLV IEC:2014 3 13.3 Application of armour . 24 Single-core cables 24 13.3.1Three-core cables . 24 13.3.2Separation sheath . 24 13.3.3Lapped bedding under armour for lead sheathed cables 24 13.3.4 13.4 Dimensions of t

18、he armour wires and armour tapes 25 13.5 Correlation between cable diameters and armour dimensions . 25 13.6 Round or flat wire armour . 25 13.7 Double tape armour 26 14 Oversheath 26 14.1 General 26 14.2 Material 26 14.3 Thickness 26 15 Test conditions 27 15.1 Ambient temperature 27 15.2 Frequency

19、and waveform of power frequency test voltages . 27 15.3 Waveform of impulse test voltages . 27 15.4 Determination of the cable conductor temperature 27 16 Routine tests . 27 16.1 General 27 16.2 Electrical resistance of conductors . 28 16.3 Partial discharge test 28 16.4 Voltage test 28 General 28 1

20、6.4.1Test procedure for single-core cables 28 16.4.2Test procedure for three-core cables . 28 16.4.3Test voltage 29 16.4.4Requirement . 29 16.4.5 16.5 Electrical test on oversheath of the cable 29 17 Sample tests 29 17.1 General 29 17.2 Frequency of sample tests 29 Conductor examination and check of

21、 dimensions 29 17.2.1Electrical and physical tests 29 17.2.2 17.3 Repetition of tests 30 17.4 Conductor examination . 30 17.5 Measurement of thickness of insulation and of non-metallic sheaths (including extruded separation sheaths, but excluding inner extruded coverings) 30 General 30 17.5.1Require

22、ments for the insulation . 30 17.5.2Requirements for the non-metallic sheaths 31 17.5.3 17.6 Measurement of thickness of lead sheath . 31 General 31 17.6.1Strip method . 31 17.6.2Ring method . 31 17.6.3 4 60502-2:2014 RLV IEC:2014 17.7 Measurement of armour wires and tapes 32 Measurement on wires 32

23、 17.7.1Measurement on tapes 32 17.7.2Requirements . 32 17.7.3 17.8 Measurement of external diameter . 32 17.9 Voltage test for 4 h . 32 Sampling 32 17.9.1Procedure . 32 17.9.2Test voltages 32 17.9.3Requirements . 33 17.9.4 17.10 Hot set test for EPR, HEPR and XLPE insulations and elastomeric sheaths

24、 33 Procedure . 33 17.10.1Requirements . 33 17.10.2 18 Type tests, electrical 33 18.1 General 33 18.2 Cables having conductor screens and insulation screens 33 General 33 18.2.1Sequence of tests . 33 18.2.2Special provisions . 34 18.2.3Bending test 34 18.2.4Partial discharge test 34 18.2.5Tan measur

25、ement for cables of rated voltage 6/10 (12) kV 18.2.6 and above . 35 Heating cycle test . 35 18.2.7Impulse test followed by a voltage test 35 18.2.8Voltage test for 4 h 36 18.2.9Resistivity of semi-conducting screens 36 18.2.10 18.3 Cables of rated voltage 3,6/6 (7,2) kV having unscreened insulation

26、 . 36 General 36 18.3.1Insulation resistance measurement at ambient temperature . 36 18.3.2Insulation resistance measurement at maximum conductor 18.3.3 temperature 37 Voltage test for 4 h 38 18.3.4Impulse test 38 18.3.5 19 Type tests, non-electrical . 38 19.1 General 38 19.2 Measurement of thicknes

27、s of insulation 38 Sampling 38 19.2.1Procedure . 38 19.2.2Requirements . 38 19.2.3 19.3 Measurement of thickness of non-metallic sheaths (including extruded separation sheaths, but excluding inner coverings) . 39 Sampling 39 19.3.1Procedure . 39 19.3.2Requirements . 39 19.3.360502-2:2014 RLV IEC:201

28、4 5 19.4 Measurement of thickness of lead sheath . 39 Sampling 39 19.4.1Procedure . 39 19.4.2Requirements . 39 19.4.3 19.5 Tests for determining the mechanical properties of insulation before and after ageing 39 Sampling 39 19.5.1Ageing treatments . 39 19.5.2Conditioning and mechanical tests 39 19.5

29、.3Requirements . 39 19.5.4 19.6 Tests for determining the mechanical properties of non-metallic sheaths before and after ageing 39 Sampling 39 19.6.1Ageing treatments . 40 19.6.2Conditioning and mechanical tests 40 19.6.3Requirements . 40 19.6.4 19.7 Additional ageing test on pieces of completed cab

30、les 40 General 40 19.7.1Sampling 40 19.7.2Ageing treatment 40 19.7.3Mechanical tests . 40 19.7.4Requirements . 40 19.7.5 19.8 Loss of mass test on PVC sheaths of type ST 2. 40 Procedure . 40 19.8.1Requirements . 41 19.8.2 19.9 Pressure test at high temperature on insulations and non-metallic sheaths

31、 . 41 Procedure . 41 19.9.1Requirements . 41 19.9.2 19.10 Test on PVC insulation and sheaths at low temperatures 41 Procedure . 41 19.10.1Requirements . 41 19.10.2 19.11 Test for resistance of PVC insulation and sheaths to cracking (heat shock test) . 41 Procedure . 41 19.11.1Requirements . 41 19.11

32、.2 19.12 Ozone resistance test for EPR and HEPR insulations . 41 Procedure . 41 19.12.1Requirements . 41 19.12.2 19.13 Hot set test for EPR, HEPR and XLPE insulations and elastomeric sheaths 41 19.14 Oil immersion test for elastomeric sheaths . 42 Procedure . 42 19.14.1Requirements . 42 19.14.2 19.1

33、5 Water absorption test on insulation . 42 Procedure . 42 19.15.1Requirements . 42 19.15.2 19.16 Flame spread test on single cables . 42 19.17 Measurement of carbon black content of black PE oversheaths 42 Procedure . 42 19.17.1Requirements . 42 19.17.2 6 60502-2:2014 RLV IEC:2014 19.18 Shrinkage te

34、st for XLPE insulation 42 Procedure . 42 19.18.1Requirements . 42 19.18.2 19.19 Thermal stability test for PVC insulation 42 Procedure . 42 19.19.1Requirements . 43 19.19.2 19.20 Determination of hardness of HEPR insulation 43 Procedure . 43 19.20.1Requirements . 43 19.20.2 19.21 Determination of th

35、e elastic modulus of HEPR insulation 43 Procedure . 43 19.21.1Requirements . 43 19.21.2 19.22 Shrinkage test for PE oversheaths 43 Procedure . 43 19.22.1Requirements . 43 19.22.2 19.23 Strippability test for insulation screen . 43 General 43 19.23.1Procedure . 43 19.23.2Requirements . 44 19.23.3 19.

36、24 Water penetration test 44 20 Electrical tests after installation 44 20.1 General 44 20.2 DC voltage test of the oversheath . 44 20.3 Insulation test. 45 AC testing . 45 20.3.1DC testing . 45 20.3.2Annex A (normative) Fictitious calculation method for determination of dimensions of protective cove

37、rings 52 A.1 General 52 A.2 Method . 52 A.2.1 Conductors . 52 A.2.2 Cores 53 A.2.3 Diameter over laid-up cores 53 A.2.4 Inner coverings . 53 A.2.5 Concentric conductors and metallic screens 54 A.2.6 Lead sheath 55 A.2.7 Separation sheath . 55 A.2.8 Lapped bedding 55 A.2.9 Additional bedding for tape

38、-armoured cables (provided over the inner covering) 56 A.2.10 Armour . 56 Annex B (informative) Tabulated continuous current ratings for cables having extruded insulation and a rated voltage from 3,6/6 kV up to 18/30 kV . 57 B.1 General 57 B.2 Cable constructions 57 B.3 Temperatures. 57 B.4 Soil the

39、rmal resistivity 58 60502-2:2014 RLV IEC:2014 7 B.5 Methods of installation 58 B.5.1 General 58 B.5.2 Single-core cables in air 58 B.5.3 Single-core cables buried direct 58 B.5.4 Single-core cables in earthenware ducts . 59 B.5.5 Three-core cables . 59 B.6 Screen bonding 60 B.7 Cable loading . 60 B.

40、8 Rating factors for grouped circuits 60 B.9 Correction factors . 60 Annex C (normative) Rounding of numbers. 76 C.1 Rounding of numbers for the purpose of the fictitious calculation method 76 C.2 Rounding of numbers for other purposes 76 Annex D (normative) Method of measuring resistivity of semi-c

41、onducting screens . 77 Annex E (normative) Determination of hardness of HEPR insulations 80 E.1 Test piece 80 E.2 Test procedure . 80 E.2.1 General 80 E.2.2 Surfaces of large radius of curvature . 80 E.2.3 Surfaces of small radius of curvature 80 E.2.4 Conditioning and test temperature . 80 E.2.5 Nu

42、mber of measurements . 81 Annex F (normative) Water penetration test 82 F.1 Test piece 82 F.2 Test . 82 F.3 Requirements . 83 Annex G (informative) Determination of the cable conductor temperature . 84 G.1 Purpose . 84 G.2 Calibration of the temperature of the main test loop 84 G.2.1 General 84 G.2.

43、2 Installation of cable and temperature sensors 84 G.2.3 Calibration method 86 G.3 Heating for the test . 87 G.3.1 Method 1 Test using a reference cable . 87 G.3.2 Method 2 Test using conductor temperature calculations and measurement of the surface temperature 87 Bibliography 89 Figure B.1 Single-c

44、ore cables in air 58 Figure B.2 Single-core cables buried direct . 59 Figure B.3 Single-core cables in earthenware ducts 59 Figure B.4 Three-core cables . 60 Figure D.1 Preparation of samples for measurement of resistivity of conductor and insulation screens . 79 Figure E.1 Test on surfaces of large

45、 radius of curvature . 81 Figure E.2 Test on surfaces of small radius of curvature . 81 8 60502-2:2014 RLV IEC:2014 Figure F.1 Schematic diagram of apparatus for water penetration test 83 Figure G.1 Typical test set-up for the reference loop and the main test loop 85 Figure G.2 Example of an arrange

46、ment of the temperature sensors on the conductor of the reference loop . 86 Table 1 Recommended rated voltages U 016 Table 2 Insulating compounds 17 Table 3 Maximum conductor temperatures for different types of insulating compound . 17 Table 4 Maximum conductor temperatures for different types of sh

47、eathing compound 18 Table 5 Nominal thickness of PVC/B insulation . 18 Table 6 Nominal thickness of cross-linked polyethylene (XLPE) insulation 19 Table 7 Nominal thickness of ethylene propylene rubber (EPR) and hard ethylene propylene rubber (HEPR) insulation . 19 Table 8 Thickness of extruded inne

48、r covering . 21 Table 9 Nominal diameter of round armour wires 25 Table 10 Nominal thickness of armour tapes 25 Table 11 Routine test voltages . 29 Table 12 Number of samples for sample tests 30 Table 13 Sample test voltages 32 Table 14 Impulse voltages 35 Table 15 Electrical type test requirements

49、for insulating compounds . 45 Table 16 Non-electrical type tests (see Tables 17 to 23) . 46 Table 17 Test requirements for mechanical characteristics of insulating compounds (before and after ageing) . 47 Table 18 Test requirements for particular characteristics for PVC insulating compound . 48 Table 19 Test requirements for particular characteristics of various thermosetting crosslinked insulating compounds . 49 Table 20 Test requirements for mechanical characteristics