IEC 61975:2010/AMD2:2022

IEC 61975 ®
Edition 1.0 2022-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 2
AM ENDEMENT 2
High-voltage direct current (HVDC) installations – System tests

Installations en courant continu à haute tension (CCHT) – Essais systèmes

IEC 61975:2010-07/AMD2:2022-10(en-fr)

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IEC 61975 ®
Edition 1.0 2022-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 2
AM ENDEMENT 2
High-voltage direct current (HVDC) installations – System tests

Installations en courant continu à haute tension (CCHT) – Essais systèmes

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.10; 31.080.01 ISBN 978-2-8322-5839-2

– 2 – IEC 61975:2010/AMD2:2022
© IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE DIRECT CURRENT (HVDC)
INSTALLATIONS – SYSTEM TESTS
AMENDMENT 2
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 this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
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6) All users should ensure that they have the latest edition of this publication.
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
Amendment 2 to IEC 61975:2010 has been prepared by subcommittee 22F: Power electronics
for electrical transmission and distribution systems, of IEC technical committee 22: Power
electronic systems and equipment.
The text of this Amendment is based on the following documents:
Draft Report on voting
22F/670/CDV 22F/691/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Amendment is English.

© IEC 2022
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications/.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
___________
2 Normative references
Replace the existing reference to IEC 60633 with the following new reference:
IEC 60633:2019, High-voltage direct current (HVDC) transmission – Vocabulary
4.6.1 Factory system test
Add, in the first sentence of the existing last paragraph, the words "and protection" after
"control".
4.6.2 Additional simulation test
Replace, in the existing first paragraph, modified by IEC 61975:2010/AMD1:2016, the words
"the additional simulation test shall be conducted, if specified by the user" with "any additional
simulation tests shall be conducted, if agreed upon between supplier and user".
Add, in item c) of the existing last paragraph, the words "and protection" after "control".
Figure 4 – Structure of system test
Delete, in the second bulleted list item of number 8) in the existing "Power transmission test"
section, the word "end".
Replace the existing third bulleted list item of number 8) in the existing Power transmission test
section, with the following new items:
• Overload conditions
• Rated load temperature rise
5.2.3.1 Low voltage energization
Replace, in the existing list, item b) with the following new item:
b) The test may be performed by applying 0,5 kV to 10 kV.
Replace, in the existing note, the words "An alternative approach" with "The preferred
approach".
– 4 – IEC 61975:2010/AMD2:2022
© IEC 2022
5.2.3.2 High voltage energization
Replace, in the existing list, item c) with the following new item:
c) Keep the transformer energized for a minimum number of hours as specified by the
manufacturer and the local utilities.
5.5.3.2 Test procedure by emitting source
Replace, in the existing list, item b), modified by IEC 61975:2010/AMD1:2016, with the following
new item:
b) Verify that the doors of the control and protection cubicles are closed.
5.5.4 Test acceptance criteria
Add, in the existing text, the words "and protection" after "control".
5.6.1 General
Add, in the existing text, modified by IEC 61975:2010/AMD1:2016, the word "converter" before
"transformers".
5.7.3.1 Open line test of the DC switchyard
Delete, in the existing list, items a), f), modified by IEC 61975:2010/AMD1:2016, and g).
6.1.1.2 General precondition
Replace, in item i) of the existing list, modified by IEC 61975:2010/AMD1:2016, the words "All
control protection" with "All the control and protection system".
6.1.2.4 Test procedure
Add, in the last sentence of item b) of the existing list, modified by IEC 61975:2010/AMD1:2016,
the abbreviated term "AC" before "voltage".
Replace, in the existing list, item h), modified by IEC 61975:2010/AMD1:2016, with the following
new item:
h) Remain at minimum power for as long as needed to complete necessary verification of
measurements.
6.1.5.4 Test procedure
Add, at the end of the introduction sentence to the existing list, the words "at both rectifier and
inverter side".
Replace the existing list, modified by IEC 61975:2010/AMD1:2016, with the following new list:
a) Set tap changer control in manual control mode and raise two steps in rectifier side.
b) Verify that the firing angle increases and the transmitted current is maintained.
c) Set the tap changer control back to auto control mode.
d) Verify that the tap changer automatically decreases, firing angle is back within control limits
and the transmitted DC current is maintained.
e) Set tap changer control in manual control mode and decrease two steps in inverter side.
f) Verify that the tap changer automatically decreases, DC voltage or extinction angle changes
based on the inverter control logic.
g) Set the tap changer control back to auto control mode.

© IEC 2022
h) Verify that the tap changer automatically increases, DC voltage or extinction angle return to
normal operation value based on the inverter control logic.
6.1.5.5 Test acceptance criteria
Replace the existing text with the following new text:
At all times, AC and DC currents and voltages shall be stable and remain within specified limits.
The firing angle and the transformer tap changer shall operate correctly and shall be kept within
specified limits.
6.2.1.2 General precondition
Replace, in item i) of the existing list, modified by IEC 61975:2010/AMD1:2016, the words "all
control protection" with "all the control and protection system".
6.2.3.2 Purpose of test
Replace the existing text, modified by IEC 61975:2010/AMD1:2016, with the following new text:
Verify the transfer performance of different DC power control modes, including transfer between
pole current control, pole power control and bipolar power control.
6.2.3.4 Test procedure
Replace, in the existing list, item a), modified by IEC 61975:2010/AMD1:2016, with the following
new item:
a) At HVDC transmission at minimum power, the operator transfers the DC power control mode
subsequently from pole current to pole power, and if applicable to bipolar power and vice
versa, at control center of master station.
Delete, in the existing list, item c).
6.2.4.2 Purpose of test
Add, at the end of the first sentence of 6.2.4.2, the words "at different operating points over the
full operating range".
Delete the second sentence, added by IEC 61975:2010/AMD1:2016, of 6.2.4.2.
6.2.4.4 Test procedure
Delete, in the existing list, item j), modified by IEC 61975:2010/AMD1:2016.
6.2.5.2 Purpose of test
Add, at the end of the first sentence of the existing paragraph, modified by
IEC 61975:2010/AMD1:2016, the words "in different AC and DC system configurations".
Delete the second sentence, added by IEC 61975:2010/AMD1:2016, of the existing paragraph.

– 6 – IEC 61975:2010/AMD2:2022
© IEC 2022
6.2.5.4 Test procedure
Replace, in the existing list, items a), e) and f) with the following new items:
a) Start the HVDC transmission at minimum current or minimum power with rated voltage in
the preselected control mode.
e) Repeat the test at a high current or power level.
f) Repeat the test in different control modes if applicable.
6.3.2.2.2 Bipolar operation
Add, after item c) of the existing list, the following new item:
d) De-block the non-operating pole at nominal current.
6.4.2.3 Test precondition
Replace, in the existing list, item b) with the following new item:
b) All protection functions including commutation failure detection should be in service.
6.4.3.3 Test precondition
Replace, in the existing list, item b) with the following new item:
b) All protection functions including commutation failure detection should be in service.
6.4.4.2 Purpose of test
Replace, in the existing list, item b), modified by IEC 61975:2010/AMD1:2016, with the following
new item:
b) Verify the performance of switching of DC filters.
6.5.2.1 General
Add, in the second sentence of the existing fourth paragraph, modified by
IEC 61975:2010/AMD1:2016, the word "for" after "are.
6.5.4.5 Test acceptance criteria
Delete, in the existing list, in the second sentence of item c), modified by
IEC 61975:2010/AMD1:2016, the word "no" before "DC".
6.5.5.2 Purpose of test
Replace the existing sentence with the following new text:
Purposes of the test are the following.
a) To check the interaction of the HVDC system with the AC system.
b) To verify that the result of on-site tests is similar to that of simulated off-site tests. If there
is any deviation, explanation should be given.
6.6.1.5.4 AC busbar phase-to-earth fault
Replace, in the existing list, item a) with the following new item:
a) It has the same objective as 6.6.1.5.2 for the close phase-to-earth fault.

© IEC 2022
6.6.1.5.5 DC line fault
Add, in the existing list, after item d), modified by IEC 61975:2010/AMD1:2016, the following
new item:
e) It checks the accuracy of li
...