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IEC 63026
Edition 1.0 2019-12
INTERNATIONAL
STANDARD
colour
inside
Submarine power cables with extruded insulation and their accessories for
rated voltages from 6 kV (U = 7,2 kV) up to 60 kV (U = 72,5 kV) –
m m
Test methods and requirements
your local IEC member National Committee for further information.
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IEC 63026
Edition 1.0 2019-12
INTERNATIONAL
STANDARD
colour
inside
Submarine power cables with extruded insulation and their accessories for
rated voltages from 6 kV (U = 7,2 kV) up to 60 kV (U = 72,5 kV) –
m m
Test methods and requirements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.060.20 ISBN 978-2-8322-7642-6
– 2 – IEC 63026:2019 © IEC 2019
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 11
3.1 Definitions of dimensional values (thicknesses, cross-sections, etc.) . 12
3.2 Definitions concerning tests . 12
3.3 Other definitions . 12
3.4 Definitions concerning test objects . 13
4 Voltage designations, materials and rounding of numbers . 14
4.1 Rated voltages . 14
4.2 Cable insulating compounds . 15
4.3 Rounding of numbers . 15
5 Cable construction . 16
5.1 General . 16
5.2 Conductors . 16
5.3 Insulation . 16
5.4 Screening . 16
5.5 Metal screen . 17
5.6 Core oversheathing materials . 17
5.7 Assembly of three-core cables and fillers . 17
5.8 Cable armour . 17
5.9 Cable outer serving . 18
5.10 Packaging . 18
6 Cable characteristics . 18
7 Accessory characteristics . 19
8 Test conditions . 19
8.1 Ambient temperature. 19
8.2 Frequency and waveform for AC voltage tests . 19
8.3 Lightning impulse test . 19
8.4 Relationship of test voltages to rated voltages . 19
8.5 Determination of the cable conductor temperature . 20
9 Routine tests on cables and accessories . 20
9.1 General . 20
9.2 Test on manufacturing lengths . 20
9.2.1 Partial discharge test . 20
9.2.2 AC voltage test . 20
9.3 Test on factory joints. 21
9.4 Test on delivery lengths . 21
9.4.1 General . 21
9.4.2 AC voltage test . 21
9.4.3 Partial discharge test . 21
9.5 Test on accessories . 21
10 Sample tests on cables . 21
10.1 General . 21
10.2 Frequency of tests . 22
10.3 Repetition of tests . 22
10.4 Conductor examination . 22
10.5 Measurement of electrical resistance of conductor and of metal screen . 22
10.6 Measurement of thickness of insulation . 23
10.6.1 General . 23
10.6.2 Requirements for the insulation . 23
10.7 Measurement of thickness of oversheath . 23
10.7.1 General . 23
10.7.2 Requirements for the oversheath . 23
10.8 Measurement of thickness of metal sheath . 23
10.8.1 General . 23
10.8.2 General . 24
10.8.3 Strip method . 24
10.8.4 Ring method . 24
10.9 Measurement of diameters . 24
10.10 Hot set test for XLPE, EPR and HEPR insulations. 24
10.10.1 Procedure . 24
10.10.2 Requirements . 24
10.11 Measurement of capacitance . 25
10.12 Tests on components of cables with a longitudinally applied metal tape or
foil, bonded to the oversheath . 25
10.13 Examination of completed cable . 25
11 Sample tests on accessories . 25
11.1 Factory joints . 25
11.1.1 General . 25
11.1.2 PD measurement and AC voltage test . 25
11.1.3 Lightning impulse voltage test . 25
11.1.4 Hot set test for insulation . 25
11.1.5 Tensile test . 26
11.1.6 Joint inspection . 26
11.1.7 Pass criteria . 26
11.2 Sample tests on repair (field) joints and terminations . 26
11.2.1 Tests on components . 26
11.2.2 Tests on complete accessory . 26
12 Type tests on cable systems . 27
12.1 General . 27
12.2 Range of type approval . 27
12.3 Summary of type tests . 29
12.4 Mechanical tests . 29
12.4.1 Coiling test . 29
12.4.2 Tensile bending test . 32
12.4.3 Tensile test . 34
12.5 Electrical type tests . 35
12.5.1 Test voltage values . 35
12.5.2 Electrical type tests and sequence of tests . 35
12.5.3 Partial discharge tests . 36
12.5.4 Tan δ measurement . 36
12.5.5 Heating cycle voltage test .
...