IEC 62895:2017

IEC 62895 ®
Edition 1.0 2017-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
High voltage direct current (HVDC) power transmission – Cables with extruded
insulation and their accessories for rated voltages up to 320 kV for land
applications – Test methods and requirements

Câbles haute tension en courant continu (CCHT) – Câbles d’énergie à isolation
extrudée et leurs accessoires pour des tensions assignées jusqu’à 320 kV pour
les applications terrestres – Méthodes et exigences d’essai

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IEC 62895 ®
Edition 1.0 2017-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
High voltage direct current (HVDC) power transmission – Cables with extruded

insulation and their accessories for rated voltages up to 320 kV for land

applications – Test methods and requirements

Câbles haute tension en courant continu (CCHT) – Câbles d’énergie à isolation

extrudée et leurs accessoires pour des tensions assignées jusqu’à 320 kV pour

les applications terrestres – Méthodes et exigences d’essai

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.060.20 ISBN 978-2-8322-4292-6

– 2 – IEC 62895:2017 © IEC 2017
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.) . 11
3.2 Definitions concerning tests . 12
3.3 Other definitions . 12
4 Voltage designations and materials . 13
4.1 Rated voltage . 13
4.2 (spare) . 14
4.3 Cable insulating materials . 14
4.4 Cable metal screens/sheaths . 14
4.4.1 General . 14
4.4.2 Metal sheath . 14
4.4.3 Combined design (CD) . 14
4.4.4 Separate design (SD) . 14
4.5 Cable oversheathing materials . 15
5 Precautions against longitudinal water penetration in cables . 15
6 Cable characteristics . 15
7 Accessory characteristics . 16
8 Test objects & conditions . 16
8.1 Definitions concerning test objects . 16
8.2 Test voltages . 17
8.3 Thermal conditions. 18
8.4 Polarity reversal test . 19
8.5 Superimposed impulse voltage test . 19
8.5.1 General . 19
8.5.2 Superimposed lightning impulse voltage . 20
8.5.3 Superimposed switching impulse voltage . 20
8.6 Relationship between test voltages and rated voltages . 20
8.7 Determination of the cable conductor temperature . 20
8.8 Rest period . 20
9 Routine tests on cables and on the main insulation of prefabricated accessories . 20
9.1 General . 20
9.2 Voltage test . 21
9.3 Electrical test on oversheath of the cable . 21
10 Sample tests on cables . 21
10.1 General . 21
10.2 Frequency of tests . 21
10.3 Repetition of tests . 21
10.4 Conductor examination . 22
10.5 Measurement of electrical resistance of conductor and of metal
screen/sheath . 22

10.6 Measurement of thickness of insulation and cable oversheath . 22
10.6.1 General . 22
10.6.2 Requirements for the insulation . 22
10.6.3 Requirements for the cable oversheath . 22
10.7 Measurement of thickness of metal sheath . 23
10.7.1 Lead or lead alloy sheath . 23
10.7.2 Plain or corrugated aluminium sheath . 23
10.8 Measurement of diameter . 24
10.9 Hot set test for XLPE and EPR insulations . 24
10.9.1 Procedure . 24
10.9.2 Requirements . 24
10.10 Measurement of capacitance . 24
10.11 Measurement of density of HDPE insulation . 24
10.11.1 Procedure . 24
10.11.2 Requirements . 24
10.12 Impulse voltage test . 24
10.13 Water penetration test . 25
10.14 Adhesion and peel strength of the laminated metal foil. 25
11 Sample tests on accessories . 25
11.1 Tests on components . 25
11.2 Tests on complete accessory . 25
12 Type tests on cable systems . 25
12.1 General . 25
12.2 Range of type approval . 25
12.3 Summary of type tests . 26
12.4 Electrical type tests on complete cable systems . 27
12.4.1 Test voltage values . 27
12.4.2 Tests and sequence of tests . 27
12.4.3 Bending test . 27
12.4.4 Heating cycle voltage test . 28
12.4.5 Superimposed impulse voltage test. 29
12.4.6 Examination . 30
12.4.7 Resistivity of semi-conducting screens . 30
12.5 Non-electrical type tests on cable components and on complete cable . 31
12.5.1 General . 31
12.5.2 Check of cable construction . 31
12.5.3 Tests for determining the mechanical properties of insulation before and
after ageing . 31
12.5.4 Tests for determining the mechanical properties of oversheaths before
and after ageing . 32
12.5.5 Ageing tests on pieces of complete cable to check compatibility of
materials . 32
12.5.6 Loss of mass test on PVC oversheaths of type ST . 32
12.5.7 Pressure test at high temperature on oversheaths . 33
12.5.8 Test on PVC oversheaths (ST and ST ) at low temperature . 33
1 2
12.5.9 Heat shock test for PVC oversheaths (ST and ST ) . 33
1 2
12.5.10 Ozone resistance test for EPR insulation . 33
12.5.11 Hot set test for EPR and XLPE insulations . 33
12.5.12 Measurement of density of HDPE insulation . 33

– 4 – IEC 62895:2017 © IEC 2017
12.5.13 Measurement of carbon black content of black PE oversheaths (ST
and ST ) . 33
12.5.14 Test under fire conditions . 34
12.5.15 Water penetration test . 34
13 Prequalification test of the cable system . 34
13.1 General and range of prequalification test approval . 34
13.2 Prequalification test on complete cable system . 35
13.2.1 Summary of prequalification tests . 35
13.2.2 Test voltage values . 35
13.2.3 Test arrangement . 35
13.2.4 Heating cycle voltage test . 36
13.2.5 Superimposed impulse voltage test. 36
13.2.6 Examination . 36
13.3 Tests for the extension of the PQ of a cable system . 37
14 Type test on cables . 37
15 Type test on accessories . 37
16 Electrical tests after installation . 37
16.1 General . 37
16.2 DC voltage test of the oversheath . 37
16.3 High voltage test of the insulation . 37
16.4 TDR measurement . 37
Annex A (informative) Determination of the cable conductor temperature . 45
A.1 Purpose . 45
A.2 Calibration of the temperature of the main test loop . 45
A.2.1 General . 45
A.2.2 Installation of cable and temperature sensors . 45
A.2.3 Calibration method . 47
A.3 Heating for the test . 47
Annex B (normative) Rounding of numbers . 49
Annex C (informative) List of type and prequalification tests of cable systems . 50
Annex D (normative) Method of measuring resistivity of semi-conducting screens . 51
Annex E (normative) Water penetration test . 53
E.1 Test piece . 53
E.2 Test . 53
E.3 Requirements . 53
Annex F (normative) Tests on components of cables with a longitudinally applied
metal tape or foil, bonded to the oversheath . 55
F.1 Visual inspection . 55
F.2 Adhesion strength of metal foil – Procedure . 55
F.3 Peel strength of overlapped metal foil – Procedure . 56
Annex G (informative) Development test on cable and cable system with longitudinal
applied metal foil, bonded to the oversheath . 57
G.1 General . 57
G.2 List of tests . 57
G.2.1 Tests on cable . 57
G.2.2 Tests on cable system – Short circuit test including accessories . 57

Annex H (normative) Tests of outer protection for joints . 58
H.1 General . 58
H.2 Range of approval. 58
H.3 Water immersion and heat cycling. 58
H.4 Voltage tests . 58
H.4.1 General . 58
H.4.2 Assemblies embodying accessories without sheath sectionalizing
insulation . 58
H.4.3 Assemblies embodying accessories with sheath sectionalizing
insulation . 59
H.5 Examination of test assembly . 59
Annex I (normative) Return cable . 60
Annex J (informative) TDR measurement . 61
Bibliography . 62

Figure 1 – Example of configuration of test objects within a test loop . 17
Figure 2 – Schematic representations of the switching impulse and lightning impulse
test voltages . 18
Figure A.1 – Schematic of sensor position in test set-up for the reference loop and the
main test loop . 46
Figure A.2 – Example of an arrangement of the temperature sensors on the conductor
of the reference loop . 47
Figure D.1 – Preparation of samples for measurement of resistivity of conductor and
insulation screens . 52
Figure E.1 – Schematic diagram of apparatus for water penetration test . 54
Figure F.1 – Test arrangement for adhesion strength of metal foil . 55
Figure F.2 – Example of overlapped metal foil . 56
Figure F.3 – Test arrangement for peel strength of overlapped metal foil . 56
Figure J.1 – Circuit diagram for TDR testing, traditional transmission line diagram, π-
model . 61

Table 1 – Insulation compounds for cables . 38
Table 2 – Oversheathing compounds for cables . 38
Table 3 – Test requirements for particular characteristics of insulating compounds for
cables . 38
Table 4 – Non-electrical type tests for insulating and oversheath compounds for cables . 39
Table 5 – Test requirements for adhesion or peel strength forces . 39
Table 6 – Sequence of heating cycle voltage test for LCC type test . 39
Table 7 – Sequence of heating cycle voltage test for VSC type test . 40
Table 8 – Sequence of switching and lightning impulse test for LCC type test . 40
Table 9 – Sequence of switching and lightning impulse test for VSC type test . 40
Table 10 – Test requirements for mechanical characteristics of insulating compounds
for cables (before and after ageing) . 41
Table 11 – Test requirements for mechanical characteristics of oversheathing
compounds for cables (before and after ageing) . 42
Table 12 – Test requirements for particular characteristics of PVC oversheathing for
cables . 43

– 6 – IEC 62895:2017 © IEC 2017
Table 13 – Sequence of heating cycle voltage test for LCC PQ test . 43
Table 14 – Sequence of heating cycle voltage test for VSC PQ test . 44
Table C.1 – Type tests on cable systems . 50
Table C.2 – PQ tests on cable systems . 50
Table H.1 – Impulse voltage tests . 59

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH VOLTAGE DIRECT CURRENT (HVDC) POWER TRANSMISSION –
CABLES WITH EXTRUDED INSULATION AND THEIR ACCESSORIES FOR
RATED VOLTAGES UP TO 320 kV FOR LAND APPLICATIONS –
TEST METHODS AND REQUIREMENTS
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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indispensable for the correct application of this publication.
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62895 has been prepared by IEC technical committee 20: Electric
cables.
The text of this standard is based on the following documents:
FDIS Report on voting
20/1708A/FDIS 20/1726/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 8 – IEC 62895:2017 © IEC 2017
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
INTRODUCTION
As a result of major developments in cable systems with extruded insulation for high voltage
DC (HVDC) applications, CIGRE study committee B1 set up working group (WG) B1.32 in
2008 with the aim to prepare recommendations for testing DC extruded cable systems for
power transmission at a rated voltage of up to 500 kV.
The recommendations of WG B1.32 were published in TB 496 in April 2012. At the time of
preparing the CIGRE recommendation there was laboratory experience at voltages up to and
including 500 kV, but operating experience was limited to 200 kV. At the time of preparation of
this standard several projects up to 320 kV are in progress and many others are planned for
the near future.
A list of relevant references is given in the Bibliography.

– 10 – IEC 62895:2017 © IEC 2017
HIGH VOLTAGE DIRECT CURRENT (HVDC) POWER TRANSMISSION –
CABLES WITH EXTRUDED INSULATION AND THEIR ACCESSORIES FOR
RATED VOLTAGES UP TO 320 kV FOR LAND APPLICATIONS –
TEST METHODS AND REQUIREMENTS
1 Scope
This International Standard specifies test methods and requirements for HVDC transmission
power cable systems, employing cables with extruded insulation and their accessories, for
fixed land installations, for rated voltages up to and including 320 kV.
Within the scope of this standard “extruded insulation” means insulation manufactured by
extrusion of either thermoplastic (e.g. polyethylene) or crosslinked (e.g. crosslinked
polyethylene, ethylene propylene rubber, etc.) material. The insulation material may be either
unfilled or filled (e.g. with mineral or carbon).
The requirements apply to single-core cables in combination with their accessories, outdoor
and terminations for gas insulated systems, joints, and asymmetric joints for usual conditions
of installation and operation, but not to special cables and their accessories, such as
submarine cables, for which modifications to the standard tests may be necessary or special
test conditions may need to be devised.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60060-2, High-voltage test techniques – Part 2: Measuring systems
IEC 60228, Conductors of insulated cables
IEC 60229, Electric cables – Tests on extruded oversheaths with a special protective function
IEC 60230, Impulse tests on cables and their accessories
IEC 60287-1-1:2006, Electric cables – Calculation of the current rating – Part 1-1: Current
rating equations (100 % load factor) and calculation of losses – General
IEC 60287-1-1:2006/AMD1:2014
IEC 60332-1-2, Tests on electric and optical fibre cables under fire conditions – Part 1-2: Test
for vertical flame propagation for a single insulated wire or cable – Procedure for 1 kW pre-
mixed flame
IEC 60502-2:2014, Power cables with extruded insulation and their accessories for rated
voltages from 1 kV (U = 1,2 kV) up to 30 kV (U = 36 kV) – Part 2: Cables for rated voltages
m m
from 6 kV (U = 7,2 kV) up to 30 kV (U = 36 kV)
m m
IEC 60502-4, Power cables with extruded insulation and their accessories for rated voltages
from 1 kV (U = 1,2 kV) up to 30 kV (U = 36 kV) – Part 4: Test requirements on accessories
m m
for cables with rated voltages from 6 kV (U = 7,2 kV) up to 30 kV (U = 36 kV)
m m
IEC 60811-201, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 201: General tests – Measurement of insulation thickness
IEC 60811-202, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 202: General tests – Measurement of thickness of non-metallic sheath

IEC 60811-203, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 203: General tests – Measurement of overall dimensions
IEC 60811-401, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 401: Miscellaneous tests – Thermal ageing methods – Ageing in an air oven
IEC 60811-403, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 403: Miscellaneous tests – Ozone resistance test on cross-linked compounds
IEC 60811-409, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 409: Miscellaneous tests – Loss of mass test for thermoplastic insulations and sheaths
IEC 60811-412, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 412: Miscellaneous tests – Thermal ageing methods – Ageing in an air bomb
IEC 60811-501, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 501: Mechanical tests – Tests for determining the mechanical properties of insulating and
sheathing compounds
IEC 60811-505, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 505: Mechanical tests – Elongation at low temperature for insulations and sheaths
IEC 60811-506, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 506: Mechanical tests – Impact test at low temperature for insulations and sheaths
IEC 60811-507, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 507: Mechanical tests – Hot set test for cross-linked materials
IEC 60811-508, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 508: Mechanical tests – Pressure test at high temperature for insulation and sheaths
IEC 60811-509, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 509: Mechanical tests – Test for resistance of insulations and sheaths to cracking (heat
shock test)
IEC 60811-605, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 605: Physical tests – Measurement of carbon black and/or mineral filler in polyethylene
compounds
IEC 60811-606, Electric and optical fibre cables – Test methods for non-metallic materials –
Part 606: Physical tests – Methods for determining the density
IEC 62067, Power cables with extruded insulation and their accessories for rated voltages
above 150 kV (U = 170 kV) up to 500 kV (U = 550 kV) – Test methods and requirements
m m
3 Terms and definitions
For the purposes of this document the following terms and definitions apply.
3.1 Definitions of dimensional values (thicknesses, cross-sections, etc.)
3.1.1
nominal value
value by which a quantity is designated and which is often used in tables
Note 1 to entry: In this standard, nominal values usually give rise to values to be checked by measurements
taking into account specified tolerances.
3.1.2
median value
value which is, when several test results have been obtained and ordered in an increasing (or
decreasing) succession, the middle value if the number of available values is odd, and the
mean of the two middle values if the number is even

– 12 – IEC 62895:2017 © IEC 2017
3.2 Definitions concerning tests
3.2.1
routine test
test carried out by the manufacturer on each manufactured component (length of cable or
accessory) to check that the component meets the specified requirements
3.2.2
sample test
test carried out by the manufacturer on samples of complete cable, or components taken from
a complete cable or accessory, at a specified frequency, so as to verify that the finished
product meets the specified requirements
3.2.3
type test
test carried out before supplying, on a general commercial basis, a type of cable system, in
order to demonstrate satisfactory performance characteristics to meet the intended
application
Note 1 to entry: Once successfully completed, these tests need not be repeated, unless changes are made in the
cable or accessory with respect to materials, manufacturing process, design or design electrical stress levels,
which might adversely change the performance characteristics.
3.2.4
prequalification test
PQ test
test carried out before supplying, on a general commercial basis, a type of cable system, in
order to demonstrate satisfactory long term performance of the complete cable system
Note 1 to entry: The PQ test need only be carried out once unless there is a substantial change in the cable
system with respect to material, manufacturing process, design or design electrical stress levels.
Note 2 to entry: A substantial change is defined as that which might adversely affect the performance of the cable
system. The supplier should provide a detailed case, including test evidence, if modifications are introduced, which
are claimed not to constitute a substantial change.
3.2.5
electrical test after installation
test carried out to demonstrate the integrity of the cable system as installed
3.2.6
development test
test carried out on test objects to characterize the properties and performance of elements of
the cable system or of selected materials and material combinations
3.3 Other definitions
3.3.1
cable system
cable with installed accessories including components used for thermo-mechanical restraint of
systems limited to those used for terminations and joints only
3.3.2
nominal electrical stress
using nominal dimensions and constant material
electrical stress calculated at U
characteristics
Note 1 to entry: See 4.1.
3.3.3
test object
object which is a cable length or an accessory to be subjected to testing
3.3.4
return cable
cable, which is typically a low/medium voltage DC cable used for the return current in
monopolar operation of HVDC schemes.

Note 1 to entry: A return cable can either be connected over the full length between the converters or can only be
connected for part of the length connecting a converter to an electrode station
3.3.5
transmission cable
cable which is a high voltage cable of a monopolar or bipolar scheme, and which is connected
to the HV terminal at the DC side of the converter
3.3.6
test loop
cable loop which is a combination of series connected test objects simultaneously under test
SEE: Figure 1.
3.3.7
line commutated converter
LCC
converter system that has the feature of changing voltage polarity on the cable system when
the direction of power flow is reversed
Note 1 to entry: See IEC 60633.
Note 2 to entry: This note 2 only applies to the French language
...