IEC 63075:2019

Superconducting AC power cables and their accessories for rated voltages from 6 kV to 500 kV - Test methods and requirements

IEC 63075:2019 specifies test methods and requirements for high-temperature superconducting (HTS) AC power cable systems, cables and their accessories, for fixed installations, for rated voltages from 6 kV (Um = 7,2 kV) up to and including 500 kV (Um = 550 kV).
The requirements apply to single-core, three-core and three-phase concentric cables with cold dielectric and their accessories that are not intended for fault current limitation purposes.
This document does not cover special cables and their accessories, such as fault current limiting cables or submarine cables, for which modifications to the standard tests may be necessary or special test conditions may need to be devised.
This document does not cover test methods and requirements for the cooling system.

General Information

• Status: Published
• Publication Date: 04-Feb-2019
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.060.20 - Cables
• Technical Committee: TC 20 - Electric cables
• Drafting Committee: PT 63075 - TC 20/PT 63075
• Current Stage: PPUB - Publication issued
• Start Date: 08-Mar-2019
• Completion Date: 05-Feb-2019

Standards Content (Sample)

IEC 63075
®

Edition 1.0 2019-02
INTERNATIONAL
STANDARD

colour
inside


Superconducting ac power cables and their accessories for rated voltages
from 6 kV to 500 kV – Test methods and requirements
IEC 63075:2019-02(en)

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IEC 63075

®


Edition 1.0 2019-02




INTERNATIONAL



STANDARD








colour

inside










Superconducting ac power cables and their accessories for rated voltages

from 6 kV to 500 kV – Test methods and requirements



























INTERNATIONAL

ELECTROTECHNICAL


COMMISSION





ICS 29.060.20 ISBN 978-2-8322-6522-2



  Warning! Make sure that you obtained this publication from an authorized distributor.


® Registered trademark of the International Electrotechnical Commission

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– 2 – IEC 63075:2019  IEC 2019
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 10
3.1 Definitions of dimensional values (thicknesses, cross-sections, etc.) . 10
3.2 Definitions concerning tests . 10
3.3 Other definitions (general design and cryogenic system) . 11
4 Voltage and current designations . 13
4.1 Rated voltages . 13
4.2 Rated operating current . 13
5 Cable materials . 14
5.1 Cable conductor materials . 14
5.2 Cable insulating materials (dielectric insulation) . 14
5.3 Cable screen materials . 14
5.4 Cable cryostat materials (thermal insulation) . 14
5.5 Cable oversheathing materials (outside cryostat) . 14
6 Cable characteristics . 14
7 Accessory characteristics . 15
8 Test conditions . 16
8.1 Ambient temperature. 16
8.2 Frequency and waveform of power frequency test voltages . 16
8.3 Wave form of impulse test voltages . 16
8.3.1 Lightning impulse voltage . 16
8.3.2 Switching impulse voltage. 16
8.4 Relationship of test voltages to rated voltages . 16
8.5 Cryogen temperature and pressure . 17
9 Routine tests on cables and on prefabricated accessories . 17
9.1 General . 17
9.1.1 Tests on cable core samples . 17
9.1.2 Tests on cable cryostat . 17
9.1.3 Tests on prefabricated accessories . 17
9.2 AC voltage test for cable followed by partial discharge test . 18
9.2.1 General . 18
9.2.2 Procedure . 18
9.2.3 Requirement . 18
9.3 Critical current measurement . 18
9.3.1 General . 18
9.3.2 Procedure . 18
9.3.3 Requirement . 19
9.4 Pressure test . 19
9.4.1 General . 19
9.4.2 Procedure . 19
9.4.3 Requirement . 19
9.5 Vacuum leak test . 19
9.5.1 General . 19

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IEC 63075:2019  IEC 2019 – 3 –
9.5.2 Procedure . 19
9.5.3 Requirement . 19
9.6 Electrical test on oversheath of the cable . 19
9.7 Tests on prefabricated accessories . 19
9.7.1 Voltage test followed by partial discharge test . 19
9.7.2 Pressure test and vacuum leak test . 20
10 Sample tests on cables . 20
10.1 General . 20
10.2 Frequency of tests . 20
10.3 Repetition of tests . 20
10.4 Conductor examination . 20
10.5 Measurement of thickness of cable insulation . 21
10.5.1 General . 21
10.5.2 Procedure . 21
10.5.3 Requirement . 21
10.6 Measurement of thickness of oversheath . 21
10.6.1 General . 21
10.6.2 Requirement . 21
10.7 Measurement of diameters . 21
10.8 Measurement of capacitance . 21
10.9 Lightning impulse voltage test . 22
11 Sample tests on accessories . 22
11.1 Tests on components . 22
11.2 Tests on complete accessory . 22
12 Type tests on cable systems . 23
12.1 General . 23
12.2 Range of type approval . 23
12.3 Summary of type tests . 24
12.4 Electrical type tests on complete cable systems . 24
12.4.1 Test voltage values . 24
12.4.2 Tests and sequence of tests . 24
12.4.3 Bending test . 25
12.4.4 Critical current measurement . 25
12.4.5 Pressure test . 25
12.4.6 Thermal cycle test . 26
12.4.7 Partial discharge test . 26
12.4.8 Tan δ measurement . 26
12.4.9 Load cycle voltage test . 26
12.4.10 Impulse voltage tests . 26
12.4.11 Examination of cable and accessories . 27
12.5 Non-electrical type tests on cable components and on complete cable . 27
12.5.1 Overview on non-electrical type tests. 27
12.5.2 Check of cable construction . 28
12.5.3 Tests for determining the mechanical properties of oversheaths before
and after ageing . 28
12.5.4 Loss of mass test on PVC oversheaths of type ST . 28
2
12.5.5 Test on PVC oversheaths (ST and ST ) at low temperature . 28
1 2
12.5.6 Heat shock test for PVC oversheaths (ST and ST ) . 29
1 2

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– 4 – IEC 63075:2019  IEC 2019
12.5.7 Measurement of carbon black content of black PE oversheaths (ST
3
and ST ) . 29
7
12.5.8 Test under fire conditions . 29
12.5.9 Pressure test of cable cryostat . 29
12.5.10 Pressure test of components of accessories . 30
13 Prequalification test of the cable system . 30
14 Type test on cables . 30
15 Type test on accessories . 30
16 Tests after installation . 30
16.1 General . 30
16.2 Tests at ambient temperature . 31
16.2.1 Vacuum test . 31
16.2.2 Pressure test . 31
16.3 Tests at operating temperature . 32
16.3.1 General . 32
16.3.2 DC current test . 32
16.3.3 AC voltage test of the insulation . 32
16.3.4 DC voltage test of the oversheath . 33
Annex A (informative) Cooling system considerations . 37
A.1 Introductory remarks . 37
A.2 Cryogenic refrigeration. 37
A.2.1 General process . 37
A.2.2 General hardware components . 38
A.3 Recommendations for tests after installation . 39
A.3.1 General . 39
A.3.2 Pressure test followed by vacuum leak test. 39
A.3.3 Cooling capacity test and efficiency measurement . 40
A.3.4 Circulation pump mass flow and pressure test . 40
A.3.5 Temperature and pressure control test . 40
A.3.6 Noise measurements . 40
A.3.7 Other measurements . 40
Annex B (normative) Critical current measurement . 41
B.1 Critical current measurement test . 41
B.1.1 General . 41
B.1.2 Procedure . 41
B.1.3 Test method . 41
Annex C (informative) Tests for engineering information . 43
C.1 Overview. 43
C.2 AC loss . 43
C.2.1 General . 43
C.2.2 Electrical method . 43
C.2.3 Calorimetric – vaporization method . 43
C.2.4 Calorimetric – cryogen mass flow method . 43
C.3 Heat invasion of cryostat . 44
C.3.1 General . 44
C.3.2 Calorimetric – vaporization of liquid cryogen . 44
C.3.3 Calorimetric – liquid cryogen mass flow method . 44
C.4 Electrical parameters . 44

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IEC 63075:2019  IEC 2019 – 5 –
C.5 Short-circuit tests (fault current) . 44
Annex D (informative) List of type tests on cable systems . 45
Annex E (normative) Tests on outer protection for joints . 46
E.1 General . 46
E.2 Range of approval. 46
E.3 Voltage tests . 46
E.3.1 General . 46
E.3.2 Assemblies embodying accessories without sheath sectionalizing
insulation . 46
E.3.3 Assemblies embodying sheath sectionalizing insulation . 46
E.4 Examination of test assembly . 47
Annex F (informative) Prequalification test of the cable system . 48
Bibliography . 49

Figure A.1 – General refrigeration process with indication of temperature and energy
flows . 37
Figure A.2 – General system components and process flow . 39
Figure B.1 – Test setup for electrical four-probe method . 41
Figure B.2 – Voltage-current characteristic for superconductor . 42

Table 1 – Test voltages . 34
Table 2 – Non-electrical type tests for oversheathing compounds for cables . 35
Table 3 – Test requirements for mechanical characteristics of oversheathing

compounds for cables (before and after ageing) . 36
Table 4 – Test requirements for particular characteristics of PVC oversheathing for
cables . 36
Table D.1 – Type tests on cable systems . 45
Table E.1 – Impulse voltage tests . 47

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– 6 – IEC 63075:2019  IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

SUPERCONDUCTING AC POWER CABLES AND THEIR ACCESSORIES
FOR RATED VOLTAGES FROM 6 KV TO 500 KV –
TEST METHODS AND REQUIREMENTS

FOREWORD
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International Standard IEC 63075 has been prepared by IEC technical committee 20: Electric
cables.
The text of this International Standard is based on the following documents:
FDIS Report on voting
20/1858/FDIS 20/1865/RVD

Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

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IEC 63075:2019  IEC 2019 – 7 –
The committee has decided that the contents of this document will remain unchanged until the
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the specific document. At this date, the document will be
• reconfirmed,
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– 8 – IEC 63075:2019  IEC 2019
INTRODUCTION
As a result of major developments in superconducting cable systems with cold dielectric for
medium- and high-voltage AC applications, CIGRE study committee B1 set up working group
(WG) B1.31 in 2009 with the aim to prepare recommendations for testing superconducting AC
cable systems for power transmission at a rated voltage of up to 150 kV.
1
The recommendations of CIGRE WG B1.31 were published in TB 538 in June 2013 [1] . At
the time of preparation of the CIGRE recommendation, laboratory experience at voltages up
to and including 275 kV was available, but operating experience was limited to 154 kV. At the
time of preparation of this document, several projects up to 220 kV are in progress, and many
others are planned for the near future. As the insulation system of high-temperature
superconducting (HTS) cable systems considered in this document is comparable to oil-filled
cable systems, it was agreed to extend the voltage range to 500 kV in order to be compatible
with IEC 60141-1 [2].
In 2014, TC 20 decided to start the standardization work on testing of HTS AC cables based
on the published CIGRE TB 538. Manufacturers of HTS cable systems, utilities as the main
users, and independent test laboratories will benefit from this document.
A list of relevant references is given in the Bibliography (see [3], [4], [5], [6]).


__________
1
Numbers in square brackets refer to the Bibliography.

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IEC 63075:2019  IEC 2019 – 9 –
SUPERCONDUCTING AC POWER CABLES AND THEIR ACCESSORIES
FOR RATED VOLTAGES FROM 6 KV TO 500 KV –
TEST METHODS AND REQUIREMENTS



1 Scope
This document specifies test me
...