IEC 63026:2019

Submarine power cables with extruded insulation and their accessories for rated voltages from 6 kV (<em>U</em>_m = 7,2 kV) up to 60 kV (<em>U</em>_m = 72,5 kV) - Test methods and requirements

IEC 63026:2019 specifies test methods and requirements for power cable systems, cables with extruded insulation and their accessories for fixed submarine installations, for rated voltages from 6 kV (Um = 7,2 kV) up to 60 kV (Um = 72,5 kV).
This document includes the electrical tests and the physical tests on materials and components as well as the specific mechanical tests that are applicable to submarine cable systems.
The requirements apply to armoured single-core cables and three-core cables in combination with their accessories, terminations and joints for usual conditions of installation and operation, but not to special cables and their accessories, such as submarine cables for dynamic applications (i.e. for direct connection to a floating structure), for which modifications to the standard tests can be necessary or special test conditions be devised.
This document is applicable to submarine cables installed in permanently submerged conditions with water depths up to 250 m.
This document does not include accessories having a mechanical function only, such as hang-offs or armour clamps.

General Information

• Status: Published
• Publication Date: 10-Dec-2019
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.060.20 - Cables
• Technical Committee: TC 20 - Electric cables
• Drafting Committee: WG 16 - TC 20/WG 16
• Current Stage: PPUB - Publication issued
• Start Date: 20-Dec-2019
• Completion Date: 11-Dec-2019

Standards Content (Sample)

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
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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 .
...