IEC GUIDE 111-1:2023

IEC GUIDE 111-1
®

Edition 1.0 2023-01
GUIDE
GUIDE


Electric equipment for high-voltage substations – Common recommendations
for product and system standards –
Part 1: AC (alternating current)

Matériels électriques pour postes haute tension – Recommandations communes
pour les normes de produits et de réseaux –
Partie 1: AC (courant alternatif)

IEC GUIDE 111-1:2023-01(en-fr)

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IEC GUIDE 111-1

®


Edition 1.0 2023-01




GUIDE







GUIDE














Electric equipment for high-voltage substations – Common recommendations

for product and system standards –

Part 1: AC (alternating current)



Matériels électriques pour postes haute tension – Recommandations communes

pour les normes de produits et de réseaux –


Partie 1: AC (courant alternatif)













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 29.020; 29.240.10 ISBN 978-2-8322-6306-8




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

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – IEC GUIDE 111-1:2023  IEC 2023
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Guidance in referencing IEC documents . 12
4.1 "Normative references" clause in product standards. 12
4.2 "Terms and definitions" clause in product standards . 12
5 Environmental conditions . 13
5.1 General . 13
5.2 Normal environmental conditions . 14
5.2.1 Table defining normal environmental conditions . 14
5.2.2 Power electronic, electronic and associated equipment . 15
5.3 Special environmental conditions . 15
6 Ratings . 16
6.1 General . 16
6.2 Voltage . 17
6.2.1 Highest voltage of a system, U . 17
s
6.2.2 Highest voltage for equipment, U . 18
m
6.2.3 Rated voltage, U . 18
r
6.2.4 Rated insulation level . 18
6.3 Rated frequency, f . 18
r
6.4 Current . 18
6.4.1 Rated current, I . 18
r
6.4.2 Rated short-time withstand current . 18
6.4.3 Rated peak withstand current . 18
6.4.4 Rated duration of short-circuit . 19
6.5 Rated supply voltage of auxiliary and control circuits . 19
6.6 Rated supply frequency of auxiliary and control circuits . 20
7 Design and construction . 20
7.1 Requirements for liquids and gases in equipment . 20
7.2 Earthing of equipment . 20
7.3 Low-voltage part of equipment . 20
7.4 Marking . 21
7.5 Electronic name plate . 21
7.6 Degrees of protection provided by enclosures . 21
7.6.1 Protection of persons against access to hazardous parts and protection
of the equipment against ingress of solid foreign objects . 21
7.6.2 Protection of equipment against ingress of water . 21
7.6.3 Protection of equipment against mechanical impact under normal
service conditions . 22
7.7 Creepage distances . 22
7.8 Fire hazard . 22
7.9 Noise level . 22
7.10 Electromagnetic compatibility (EMC) . 22

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IEC GUIDE 111-1:2023  IEC 2023 `– 3 –
7.10.1 General . 22
7.10.2 Emissions . 23
7.10.3 Immunity . 23
7.11 Mechanical stresses on terminals . 24
7.12 Interfaces . 24
8 Tests . 24
8.1 General . 24
8.1.1 Overview . 24
8.1.2 Types of test . 24
8.1.3 Sequencing and grouping of tests . 25
8.1.4 Information for identification of specimens . 25
8.1.5 Information to be included in type-test reports . 25
8.2 Type tests . 25
8.2.1 Overview . 25
8.2.2 Dielectric tests . 25
8.2.3 Temperature-rise tests . 25
8.2.4 Verification of protection . 25
8.2.5 Electromagnetic compatibility (EMC) tests . 25
8.2.6 Emission tests on LV parts of equipment . 26
8.2.7 Mechanical stresses on terminals . 26
8.2.8 Impact of environmental stresses on products . 26
8.3 Routine tests. 26
8.4 Special tests . 26
8.5 Sample tests . 26
8.6 Commissioning tests . 26
9 Rules for transport, storage, erection, operation and maintenance . 27
10 Safety . 27
10.1 General . 27
10.2 Electrical aspects . 28
10.3 Thermal and mechanical aspects . 28
10.3.1 General . 28
10.3.2 Mechanical aspects . 28
10.3.3 Thermal aspects . 28
10.4 Connection to other equipment . 28
11 Effects of product standards on the natural environment . 29
Annex A (normative) Identification of test specimens . 30
Annex B (normative) Electronic nameplate . 31
B.1 General . 31
B.2 Device name plate (DPL) . 32
Bibliography . 34

Table 1 – Normal environmental conditions . 14
Table 2 – Normal environmental conditions - power electronic, electronic and
associated equipment . 15
Table 3 – Special environmental conditions . 16
Table 4 – DC supply voltage . 19
Table 5 – Auxiliary contact classes . 20

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– 4 – IEC GUIDE 111-1:2023  IEC 2023
Table A.1 – List of drawings to be submitted by manufacturer . 30
Table B.1 – Nameplate data objects of equipment interface logical nodes. 31
Table B.2 – Attributes of DPL . 32
Table B.3 – Common data classes (CDCs) for settings . 32
Table B.4 – Attributes of VSD . 33

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IEC GUIDE 111-1:2023  IEC 2023 `– 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

ELECTRIC EQUIPMENT FOR HIGH-VOLTAGE SUBSTATIONS – COMMON
RECOMMENDATIONS FOR PRODUCT AND SYSTEM STANDARDS –

Part 1: AC (alternating current)

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
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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 IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
This first edition of IEC Guide 111-1 has been prepared, in accordance with
ISO/IEC Directives, Part 1, Annex A, by the IEC Advisory Committee on Transmission and
Distribution (ACTAD).
This first edition of IEC Guide 111-1, together with IEC Guide 111-2, cancels and replaces the
second edition of IEC Guide 111 published in 2004.
The main changes with respect to the previous edition are as follows:
a) IEC Guide 111 is revised into two parts – Part 1 for AC and Part 2 for DC (Part 2 to be
prepared);
b) the scope of the document has been expanded to cover electric equipment in AC high-
voltage substations;
c) new definitions have been included;
d) normal conditions have been revised;

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– 6 – IEC GUIDE 111-1:2023  IEC 2023
e) a general revision of other clauses.
The text of this IEC Guide is based on the following documents:
Draft Report on voting
SMBNC/25/DV SMBNC/28/RV

Full information on the voting for the approval of this IEC Guide can be found in the report on
voting indicated in the above table.
The language used for the development of this Guide is English.
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.

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IEC GUIDE 111-1:2023  IEC 2023 `– 7 –
INTRODUCTION
This document is for use by IEC technical committees (TCs) involved in high-voltage (HV)
substation systems, such as:
TC 8, TC 13, TC 14, TC 17, TC 20, TC 22, TC 32, TC 33, TC 36, TC 37, TC 38, TC 57, TC 95,
TC 99, TC 115, TC 122, TC 123.
It is of paramount importance that the IEC, through this document, ensures consistency and
avoids discrepancies between standards within one system. A few discrepancies can be
justified in certain cases according to the specificity of a given product or situation.
The cost of over-standardization of a component compared to utilization of the nearest linked
under-standardized component should be considered. The supplementary cost does not in
any way increase the reliability of the system as a whole.
Since the same external stresses (climatic, electrical, and mechanical) apply to all the
components of the substations, the consistency of their technical features is vital.
The same essential requirements for safety, environmental impact, end of life, availability and
integration of systems are applicable. All product standards for a single system need to fulfil
these requirements with the same degree of responsibility.
The aim of this document is to provide common rules for HV substation equipment.

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– 8 – IEC GUIDE 111-1:2023  IEC 2023
ELECTRIC EQUIPMENT FOR HIGH-VOLTAGE SUBSTATIONS –
COMMON RECOMMENDATIONS FOR PRODUCT AND SYSTEM
STANDARDS –

Part 1: AC (alternating current)



1 Scope
This part of IEC Guide 111 is a horizontal publication which gives guidance for the
harmonization of product and system standards for HV substations (higher than 1 kV). It
addresses AC equipment which is found in high-voltage (HV) substations in most cases.
This document contains recommendations for common specifications for all HV substation
product and system standards, each of which is augmented by the technical background
specific to each technical committee, which naturally retains freedom in its technical choices.
This document is applicable when developing product and systems standards for HV power
electronic equipment for the AC part of the substation.
NOTE 1 IEC Guide 111-2 relating to DC (direct current) is under development. Once published, IEC Guide 111-2
will be applicable when developing product and systems standards for the HVDC part of the substation.
NOTE 2 The IEC Standardization Management Board (SMB) has decided that Guides such as this one can have
mandatory requirements which shall be followed by all IEC committees developing technical work that falls within
the scope of the Guide, as well as guidance which may or may not be followed. The mandatory requirements in this
Guide are identified by the use of "shall". Statements that are only for guidance are identified by using the verb
"should". (See ISO/IEC Directives, IEC Supplement Part 1, A.1.1.)
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
highest voltage of a system
U
s
highest value of operating voltage which occurs under normal operating conditions at any time
and at any point in the system
Note 1 to entry: Transient overvoltages, due e.g. to switching operations, and abnormal temporary variations of
voltage, are not taken into account.
Note 2 to entry: The highest voltage of a system is considered as the phase-to-phase operating voltage (RMS
value).

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IEC GUIDE 111-1:2023  IEC 2023 `– 9 –
[SOURCE: IEC 60050-601:1985, 601-01-23, modified – The symbol U and Note 2 to entry
s
have been added.]
3.2
highest voltage for equipment

U
m
greatest value of line-to-line voltage (RMS value) for which the equipment is designed in
respect of its insulation as well as other characteristics which relate to this voltage in the
relevant equipment standards under normal service conditions
[SOURCE: IEC 60050-614:2016, 614-03-01, modified – The symbol U has been added.]
m
3.3
rated voltage
U
r
voltage value assigned by a manufacturer or other entity for a specified
operating condition of a component, device or equipment
Note 1 to entry: The value for the rated voltage of high-voltage equipment is generally assigned from the list of
highest voltages for equipment in Tables 3, 4 and 5 of IEC 60038:2009.
Note 2 to entry: The value for the rated voltage of low voltage equipment is generally assigned from the list of
nominal voltages in Tables 1 and 6 of IEC 60038:2009.
Note 3 to entry: Equipment may have more than one rated voltage value or may have a rated voltage range.
[SOURCE: IEC 60050-614:2016, 614-03-09, modified – The symbol U has been added.]
r
3.4
electric equipment
item used for such purposes as generation, conversion, transmission, distribution or utilization
of electric energy, such as electric machines, transformers, switchgear and controlgear,
measuring instruments, protective devices, wiring systems, current-using equipment
[SOURCE: IEC 60050-826:2004, 826-16-01]
3.5
rated value
value of a quantity used for specification purposes, established for a specified set of operating
conditions of a component, device, equipment, or system
[SOURCE: IEC 60050-151:2001, 151-16-08]
3.6
rated insulation level
test voltages, under specified conditions, that the insulation is designed to withstand
Note 1 to entry: These test voltages can be for instance:
a) rated lightning impulse and short duration power frequency withstand voltages;
b) rated lightning and switching impulse withstand voltages (phase-to-earth).
[SOURCE: IEC 60050-421:1990, 421-09-02]
3.7
rated frequency
f
r
frequency at which the equipment is designed to operate

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– 10 – IEC GUIDE 111-1:2023  IEC 2023
Note 1 to entry: The standard values of the rated frequency are 50 Hz and 60 Hz.
[SOURCE: IEC 60050-421:1990, 421-04-03, modified – "transformer or reactor" has been
replaced with "equipment", the symbol f and Note 1 to entry have been added.]
r
3.8
rated current
I
r
RMS value of the current which equipment is designed to carry continuously under specified
conditions of use and behaviour
Note 1 to entry: Rated currents for temporary or for intermittent duty are subject to agreement between
manufacturer and user.
Note 2 to entry: In the area of transformers, rated power is used and not rated current.
3.9
high voltage
HV
set of voltage levels in excess of low voltage
Note 1 to entry: High voltage (HV) covers nominal voltages above low voltage (1,0 kV AC and 1,5 kV
...