IEC 60840:2020

Power cables with extruded insulation and their accessories for rated voltages above 30 kV (Um= 36 kV) up to 150 kV (Um = 170 kV) - Test methods and requirements

IEC 60840:2020

Name:IEC 60840:2020   Standard name:Power cables with extruded insulation and their accessories for rated voltages above 30 kV (Um= 36 kV) up to 150 kV (Um = 170 kV) - Test methods and requirements
Standard number:IEC 60840:2020   language:English language
Release Date:18-May-2020   technical committee:TC 20 - Electric cables
Drafting committee:WG 16 - TC 20/WG 16   ICS number:01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION

IEC 60840
Edition 5.0 2020-05
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Power cables with extruded insulation and their accessories for rated voltages
above 30 kV (Um = 36 kV) up to 150 kV (Um = 170 kV) – Test methods and
requirements




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IEC 60840
Edition 5.0 2020-05
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Power cables with extruded insulation and their accessories for rated voltages

above 30 kV (Um = 36 kV) up to 150 kV (Um = 170 kV) – Test methods and

requirements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.060.20 ISBN 978-2-8322-8381-3

– 2 – IEC 60840:2020 RLV © IEC 2020
CONTENTS
FOREWORD . 8
INTRODUCTION . 10
1 Scope . 12
2 Normative references . 12
3 Terms and definitions . 15
3.1 Definitions of dimensional values (thicknesses, cross-sections, etc.) . 15
3.2 Definitions concerning tests . 15
3.3 Other definitions . 16
4 Voltage designations, materials and rounding of numbers . 17
4.1 Rated voltages . 17
4.2 Cable insulating materials compounds . 17
4.3 Cable metal screens/sheaths . 17
4.4 Cable oversheathing materials compounds . 18
4.5 Rounding of numbers . 18
5 Precautions against water penetration in cables . 18
6 Cable characteristics . 19
7 Accessories characteristics . 20
7.1 Gas immersed cable terminations . 20
7.2 Composite insulators for outdoor cable terminations . 20
7.3 Accessory characteristics to be declared . 20
8 Test conditions . 21
8.1 Ambient temperature. 21
8.2 Frequency and waveform of power frequency test voltages .
8.2 High voltage tests . 21
8.3 Waveform of lightning impulse test voltages . 21
8.4 Relationship of test voltages to rated voltages . 21
8.5 Determination of the cable conductor temperature . 22
9 Routine tests on cables and on the main insulation of prefabricated accessories . 22
9.1 General . 22
9.2 Partial discharge test . 22
9.3 Voltage test . 23
9.4 Electrical test on oversheath of the cable . 23
10 Sample tests on cables . 23
10.1 General . 23
10.2 Frequency of tests . 23
10.3 Repetition of tests . 23
10.4 Conductor examination . 24
10.5 Measurement of electrical resistance of conductor and metal screen . 24
10.6 Measurement of thickness of cable insulation and oversheath . 24
10.6.1 General . 24
10.6.2 Requirements for the insulation . 25
10.6.3 Requirements for the cable oversheath . 25
10.7 Measurement of thickness of metal sheath . 25
10.7.1 General . 25
10.7.2 Lead or lead alloy sheath . 26

10.7.3 Plain or corrugated Copper or aluminium sheath . 26
10.7.4 Metal tape for CD design . 27
10.8 Measurement of diameters . 27
10.9 Hot set test for XLPE, EPR and HEPR insulations. 27
10.9.1 Procedure . 27
10.9.2 Requirements . 27
10.10 Measurement of capacitance . 27
10.11 Measurement of density of HDPE insulation . 27
10.11.1 Procedure . 27
10.11.2 Requirements . 27
10.12 Lightning impulse voltage test . 27
10.13 Water penetration test . 28
10.14 Additional tests on components of cables with a longitudinally applied metal
tape or foil, bonded to the oversheath . 28
11 Sample tests on accessories . 28
11.1 Tests on components of accessory . 28
11.2 Tests on complete accessory . 28
12 Type tests on cable systems . 29
12.1 General . 29
12.2 Range of type approval . 29
12.3 Summary of type tests . 31
12.4 Electrical type tests on complete cable systems . 31
12.4.1 Test voltage values . 31
12.4.2 Tests and sequence of tests . 32
12.4.3 Bending test . 32
12.4.4 Partial discharge tests . 33
12.4.5 Tan δ measurement . 34
12.4.6 Heating cycle voltage test . 34
12.4.7 Lightning impulse voltage test followed by a power frequency voltage
test . 35
12.4.8 Examination . 35
12.4.9 Resistivity of semi-conducting screens . 35
12.5 Non-electrical type tests on cable components and on complete cable . 36
12.5.1 General . 36
12.5.2 Check of cable construction . 36
12.5.3 Tests for determining the mechanical properties of insulation before and
after ageing . 36
12.5.4 Tests for determining the mechanical properties of oversheaths before
and after ageing . 37
12.5.5 Ageing tests on pieces of complete cable to check compatibility of
materials . 37
12.5.6 Loss of mass test on PVC oversheaths of type ST . 38
12.5.7 Pressure test at high temperature on oversheaths . 38
12.5.8 Test on PVC oversheaths (ST ST ) and LSHF oversheaths (ST ) at
1, 2 12
low temperature . 39
12.5.9 Heat shock test for PVC oversheaths (ST and ST ) . 39
1 2
12.5.10 Ozone resistance test for EPR and HEPR insulations . 39
12.5.11 Hot set test for EPR, HEPR and XLPE insulations . 39
12.5.12 Measurement of density of HDPE insulation . 40

– 4 – IEC 60840:2020 RLV © IEC 2020
12.5.13 Measurement of carbon black content of black PE oversheaths (ST
and ST ) . 40
12.5.14 Test under fire conditions . 40
12.5.15 Water penetration test . 41
12.5.16 Tests
...

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