IEC TR 61901:2016
(Main)Tests recommended on cables with a longitudinally applied metal foil for rated voltages above 30 kV (Um = 36 kV) up to and including 500 kV (Um = 550 kV)
Tests recommended on cables with a longitudinally applied metal foil for rated voltages above 30 kV (U<sub>m</sub> = 36 kV) up to and including 500 kV (U<sub>m</sub> = 550 kV)
IEC TR 61901:2016(E), which is a Technical Report, specifies test methods and requirements for power cable systems, cables with extruded insulation and their accessories for fixed installations, for rated voltages above 30 kV (Um = 36 kV) up to and including 500 kV (Um = 550 kV). The requirements apply to single-core cables and to their accessories for usual conditions of installation and operation, but not to special cables and their accessories, such as submarine cables, for which modifications to the tests may be necessary or special test conditions may need to be devised. This edition includes the following significant technical changes with respect to the previous edition:
a) Recommendations on the tests to be performed at the different stages of the cable and cable system qualification (development tests, type tests, sample tests, routine tests, after installation tests) have been provided;
b) The performance level of the tests related to the longitudinally applied metal foil which depends on the cable design has been detailed;
c) Three cable designs that represent the world production of cables with longitudinally applied metal foil have been detailed;
d) A test on the weld design has been included, following the appearance of a new cable design with smooth and longitudinally welded aluminium foil (referred to in this document as combined design);
e) An examination of the cable at the end of the type test has been included;
f) The cable system approach (cable with installed accessories) has been considered and a short circuit test with accessories has been introduced.
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IEC TR 61901 ®
Edition 2.0 2016-05
TECHNICAL
REPORT
Tests recommended on cables with a longitudinally applied metal foil for rated
voltages above 30 kV (U = 36 kV) up to and including 500 kV (U = 550 kV)
m m
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IEC TR 61901 ®
Edition 2.0 2016-05
TECHNICAL
REPORT
Tests recommended on cables with a longitudinally applied metal foil for rated
voltages above 30 kV (U = 36 kV) up to and including 500 kV (U = 550 kV)
m m
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.060.20 ISBN 978-2-8322-3386-3
– 2 – IEC TR 61901:2016 © IEC 2016
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references. 7
3 Terms and definitions . 7
3.1 Definitions concerning the tests . 7
3.2 Definitions concerning cable design . 8
3.3 Other definitions . 8
4 Development tests . 8
4.1 Tests on cables . 8
4.1.1 Impact test . 8
4.1.2 Abrasion test. 10
4.1.3 Sidewall loading test . 11
4.1.4 Long-term ageing of adhesive bonds of components of laminated
covering . 13
4.1.5 Mechanical properties of the weld (case of CD design) . 13
4.2 Tests on cable systems . 14
4.2.1 General . 14
4.2.2 Short-circuit test. 15
4.2.3 Corrosion at the accessories . 18
5 Type tests . 18
5.1 Test on cables – Bending test . 18
5.2 Tests on cable system . 19
6 Sample test on cables . 19
6.1 Adhesion and peel strength of the laminated metal foil . 19
6.2 Electrical properties and dimensions . 21
7 Routine tests . 21
8 After installation tests . 21
Annex A (informative) Details on cable designs given in 3.2 . 22
A.1 Combined design (CD) . 22
A.2 Separate design (SD) . 22
A.3 Separate semi-conductive design (SscD) . 23
Bibliography . 25
Figure 1 – Test apparatus for the impact test . 9
Figure 2 – Positions of the points of impact . 9
Figure 3 – Deformation at the impact points to be examined . 10
Figure 4 – Test arrangement for the abrasion test . 11
Figure 5 – Sidewall loading test arrangements . 12
Figure 6 – Test arrangement for the measurement of the mechanical properties of the weld . 14
Figure 7 – Short-circuit test arrangement for three kinds of joints . 16
Figure 8 – Adhesion of metal foil . 20
Figure 9 – Example of overlapped metal foil . 21
Figure 10 – Peel strength of overlapped metal foil . 21
Figure A.1 – Example of combined design 500 kV cable . 22
Figure A.2 – Example of separate design 400 kV cable . 23
Figure A.3 – Example of separate semi-conductive design 275 kV cable . 24
Table 1 – Impact test requirements . 9
Table 2 – Maximum acceptable sidewall loadings . 11
Table 3 – Minimum acceptable adhesion or peel strength forces . 19
– 4 – IEC TR 61901:2016 © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TESTS RECOMMENDED ON CABLES WITH A LONGITUDINALLY
APPLIED METAL FOIL FOR RATED VOLTAGES ABOVE 30 kV
(U = 36 kV) UP TO AND INCLUDING 500 kV (U = 550 kV)
m m
FOREWORD
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The main task of IEC technical committees is to prepare International Standards. However, a
technical committee may propose the publication of a Technical Report when it has collected
data of a different kind from that which is normally published as an International Standard, for
example "state of the art".
IEC TR 61901, which is a Technical Report, has been prepared by IEC technical committee
20: Electric cables.
This second edition cancels and replaces the first edition, published in 2005. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Recommendations on the tests to be performed at the different stages of the cable and
cable system qualification (development tests, type tests, sample tests, routine tests, after
installation tests) have been provided.
b) The performance level of the tests related to the longitudinally applied metal foil which
depends on the cable design has been detailed.
c) Three cable designs that represent the world production of cables with longitudinally
applied metal foil have been detailed.
d) A test on the weld design has been included, following the appearance of a new cable
design with smooth and longitudinally welded aluminium foil (referred to in this document
as combined design).
e) An examination of the cable at the end of the type test has been included.
f) The cable system approach (cable with installed accessories) has been considered and a
short circuit test with accessories has been introduced.
The text of this Technical Report is based on the following documents:
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