IEC 61975:2010/AMD1:2016

IEC 61975 ®
Edition 1.0 2016-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AM ENDMENT 1
AM ENDEMENT 1
High-voltage direct current (HVDC) installations – System tests

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

IEC 61975:2010-07/AMD1:2016-09(en-fr)

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 15 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and

CISPR.
IEC Just Published - webstore.iec.ch/justpublished

Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: csc@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Catalogue IEC - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
Application autonome pour consulter tous les renseignements Le premier dictionnaire en ligne de termes électroniques et
bibliographiques sur les Normes internationales, électriques. Il contient 20 000 termes et définitions en anglais
Spécifications techniques, Rapports techniques et autres et en français, ainsi que les termes équivalents dans 15
documents de l'IEC. Disponible pour PC, Mac OS, tablettes langues additionnelles. Egalement appelé Vocabulaire
Android et iPad. Electrotechnique International (IEV) en ligne.

Recherche de publications IEC - www.iec.ch/searchpub Glossaire IEC - std.iec.ch/glossary
La recherche avancée permet de trouver des publications IEC 65 000 entrées terminologiques électrotechniques, en anglais
en utilisant différents critères (numéro de référence, texte, et en français, extraites des articles Termes et Définitions des
comité d’études,…). Elle donne aussi des informations sur les publications IEC parues depuis 2002. Plus certaines entrées
projets et les publications remplacées ou retirées. antérieures extraites des publications des CE 37, 77, 86 et

CISPR de l'IEC.
IEC Just Published - webstore.iec.ch/justpublished

Restez informé sur les nouvelles publications IEC. Just Service Clients - webstore.iec.ch/csc
Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur cette
Disponible en ligne et aussi une fois par mois par email. publication ou si vous avez des questions contactez-nous:
csc@iec.ch.
IEC 61975 ®
Edition 1.0 2016-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AM ENDMENT 1
AM ENDEMENT 1
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 978-2-8322-3610-9

– 2 – IEC 61975:2010/AMD1:2016
© IEC 2016
FOREWORD
This amendment 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:
CDV Report on voting
22F/375/CDV 22F/394A/RVC
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base 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.
_____________
General:
Replace throughout the text the abbreviations "a.c" and "d.c" by the abbreviations "AC" and
"DC" respectively.
Introduction
Delete listing using a) to l).
Replace, in c), the word "Definitions" by the words "Terms and definitions"
Replace, in d), the word "General" by the words "Objectives of system tests".
Delete, in h), the word "Power".
Replace, in the first line of the last paragraph, the word "objects" by the word "objectives".
1 Scope
Add, in the first sentence of the second paragraph, the word "monopolar" after the word
"bidirectional"
Delete, in the third paragraph, the word "some".

© IEC 2016
2 Normative references
Replace, in the last sentence of the first paragraph, the word "updated" by the word "undated".
3. Terms and definitions
3.1.1
station test
Replace the existing term and definition by the following new term and definition:
3.1.1
converter station tests
converter station system test including items which verify the function of individual equipment
of the converter station in energized state
Add, after 3.1.3, the following new terms and definitions:
3.1.4
on-site tests
tests which are performed at the final construction site consisting of converter station test and
transmission test
3.2 Operation state terms
Replace the first sentence by the following note:
NOTE There are five defined states in the HVDC system: earthed, stopped, standby, blocked, de-blocked.
3.2.3
standby
Replace, in the definition, "DC" by "HVDC".
Add, after the last sentence of the note, the following new sentence:
The standby state is also referred to as "Ready for energization".
3.2.4
blocked
Replace the second sentence of the note by the following new sentence:
The valve cooling system is in operation, and the cooling water conductivity, flow rate and water temperature are
within the specified limits.
Add, at the end of the note, the following new sentence:
The blocked state is also referred to as "Ready for operation".
3.2.6
off-site tests
Add, after the definition, the following new note:
EXAMPLE Routine and type tests performed at the suppliers’ factory.

– 4 – IEC 61975:2010/AMD1:2016
© IEC 2016
4 General
Replace the existing title by the following new title:
4 Objectives of system tests
4.1 Purpose
Replace the existing title by the following new title:
4.1 Categories of system tests
Replace, in the fourth paragraph, the word "test" by the word "testing".
Add, at the beginning of the second paragraph after Figure 1, the following new sentence:
Acceptance tests are the acceptance requirements for a successful completion of works and a
basis for the final acceptance of the HVDC system by its users.
4.2 Structure of the HVDC system
Replace, in the second sentence of the first paragraph, the word "converters" by the words
"converter units".
Add, before the last sentence of the first paragraph, the following new sentences:
Two terminals in connection constitute a HVDC system. If the configuration comprises a
single pole, it is defined as a monopolar HVDC system. If the configuration comprises two
poles of opposite polarities with respect to earth, it is called a bipolar HVDC system.
Replace Figure 2 by the following new figure:

© IEC 2016
Converter Converter
DC line/cable/bus
terminal terminal
Pole
Bipole
Pole
IEC
Figure 2 – Structure of the HVDC system
4.4 Logical steps of system test
Replace the existing text by the following new text:
To ensure proper functioning, the type test and functional performance test shall be
conducted in factory in order to debug and test the control system before the site test.
In order to provide the power grid data and help to compile the system test plan, the off-line
digital simulation shall be conducted before and during the simulation test, especially analysis
on the power flow, stability and overvoltage.
Considering the complexity of the HVDC system, all limiting design cases may be conducted
on the digital simulator in a similar way to those done on site.
Commissioning an HVDC system may affect more than the actual contract parties. The
complexity and the diversified areas concerned during system testing require thorough
planning and scheduling, cooperation of all involved parties and complete and structured
documentation. Before a system test can begin on site, the following preconditions shall be
fulfilled concerning subsystem tests, operator training and safety instructions, system test
plan and test procedures, and all necessary test equipment.
a) All subsystems shall have been tested and commissioned, including AC filters and the
converter transformers.
b) Operating personnel shall be sufficiently trained.

– 6 – IEC 61975:2010/AMD1:2016
© IEC 2016
c) Operating instructions for the station shall be available.
d) Personnel, plant safety and security instructions shall be available.
e) System test plan and documentation (Part 8) shall be available and agreed upon.
f) AC/DC power profiles shall have been agreed for each test.
g) Any AC/DC system operating restrictions shall have been identified.
h) Operator voice communications shall be available
i) All necessary test equipment shall have been calibrated and in service.
j) Procedures for the preparation and evaluation of test results shall have been agreed upon.
Site system tests shall follow the structure of the HVDC system, starting from the smallest,
least complex operational unit, usually a 12-pulse converter, and shall end with the total
system in operation. The test sequence shall be scheduled starting at the local level with
simple tests before involving additional locations and the transmission system and more
complex tests.
After all preconditions are fulfilled, converter station tests shall be conducted and begin from
the converter unit test, including the energization of AC filter and DC yard, changing the DC
system configuration, electromagnetic interference, trip test, open line test, etc.
The power transmission (also called end-to-end) test shall start on a monopolar basis,
continuing with bipolar operation, with full power transmission being the final step.
Having the complete system running properly, performance of the steady state can be verified.
With normal operating ramp settings and automatic switching sequences in place, the effect of
a number of disturbances on the DC side of the system as well as in the AC systems may be
checked, and the transient and fault recovery performances may be verified.
Acceptance tests shall be defined between supplier and user in advance and may be
performed at an appropriate time during the test schedule.
Correct operation of the HVDC system over an extended period of time is checked during the
trial operation.
Complete and organized documentation of the system tests, which benefit both the supplier
and the user, shall form part of the project documentation and contain all necessary data
records, logs, etc, and if necessary a commentary and references.
After all the above HVDC system tests have been completed, all functio
...