IEC GUIDE 111:2004

INTERNATIONAL
GUIDE
ELECTROTECHNICAL
COMMISSION
Second edition
2004-07
Electrical high-voltage equipment
in high-voltage substations –
Common recommendations
for product standards
Reference number
INTERNATIONAL
GUIDE
ELECTROTECHNICAL
COMMISSION
Second edition
2004-07
Electrical high-voltage equipment
in high-voltage substations –
Common recommendations
for product standards
© IEC 2004 – Copyright - all rights reserved
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 the publisher.
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Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
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– 2 – Guide 111 ¤ IEC:2004(E)
CONTENTS
FOREWORD.4
INTRODUCTION.5
1 Scope.6
2 Reference documents.6
3 Guidance for the “Normative references” clause in product standards.8
4 Guidance for the “Definitions” clause in product standards .8
5 Environmental conditions.8
5.1 General.8
5.2 Normal environmental conditions .9
5.3 Special environmental conditions .10
6 Ratings.11
6.1 General.11
6.2 Highest voltage for equipment.11
6.3 Rated insulation levels.12
6.4 Rated frequency.12
6.5 Rated current.12
6.6 Rated short-time withstand current.12
6.7 Rated peak withstand current.12
6.8 Rated duration of short circuit .13
6.9 Rated supply voltage of auxiliary and control circuits .13
6.10 Rated supply frequency of auxiliary and control circuits .13
7 Design and construction.13
7.1 Requirements for liquids and gases in equipment.13
7.2 Earthing of equipment.14
7.3 Low-voltage part of equipment .14
7.4 Marking.14
7.5 Degrees of protection by enclosures .15
7.6 Creepage distances.15
7.7 Fire hazard.15
7.8 Noise level.15
7.9 Electromagnetic compatibility (EMC) .15
7.10 Mechanical stresses on terminals .16
7.11 Interfaces.16
8 Tests.16
8.1 General.16
8.2 Type tests.17
8.3 Routine tests.18
8.4 Special tests.18
8.5 Sample tests.18
8.6 Commissioning tests.18
9 Rules for transport, storage, erection, operation and maintenance.19

Guide 111 ¤ IEC:2004(E) – 3 –
10 Safety.19
10.1 General.19
10.2 Electrical aspects.19
10.3 Mechanical aspects.19
10.4 Thermal aspects.19
10.5 Operation aspects.19
11 Effects of product standards on the natural environment .20
12 Guide for the selection of equipment according to use.20
13 Information to be given with enquiries, tenders and orders .20
Annex A Identification of test specimens .21
Table 1 – Normal environmental conditions .9
Table 2 – Special environmental conditions .10
Table 3 – DC supply voltage.13
Table 4 – Auxiliary contact classes.14
Table A.1 – List of drawings to be submitted by manufacturer.21

– 4 – Guide 111 ¤ IEC:2004(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
ELECTRICAL HIGH-VOLTAGE EQUIPMENT
IN HIGH-VOLTAGE SUBSTATIONS –
COMMON RECOMMENDATIONS FOR PRODUCT STANDARDS
FOREWORD
This second edition of IEC Guide 111 has been prepared in accordance with Annex A of Part 1
of the ISO/IEC Directives by an ad hoc group of the Standardization Management Board set up
to harmonize characteristics for substation standards.
It constitutes a technical revision of the first edition, published in 1998. This edition has been
amended to express more clearly the guidance being provided to product committees and
contains corrected and completed technical material and references.
The text of this guide is based on the following documents:
Approval document Report on voting
C/1325/DV C/1334/RV
Full information on the voting for the approval of this Guide can be found in the report on voting
indicated in the above table.
Guide 111 ¤ IEC:2004(E) – 5 –
INTRODUCTION
This Guide is for use by technical committees (TCs) involved in high-voltage (HV) substation
systems, such as:
TC 13, TC 14, TC 17, TC 20, TC 22, TC 28, TC 32, TC 33, TC 36, TC 37, TC 38, TC 57,
TC 95, TC 99.
It is of paramount importance that the IEC, through this Guide, finds a way to overcome the
lack of consistency and unnecessary discrepancies between standards within one system,
even though a few discrepancies might be justified in certain cases according to the specificity
of a given product or situation.
Furthermore, the cost of over-standardization of one component when the nearest linked
component is under-standardized 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, mechanical) apply to all the components
of the substations, the consistency of their technical features is vital.
Hence, standards will deal more and more with the same essential requirements for safety,
environmental impact, end of life, availability and integration of systems. All product standards
for a single system have to fulfil these requirements with the same degree of responsibility.
The aim of this Guide is to provide common rules for HV substation equipment.

– 6 – Guide 111 ¤ IEC:2004(E)
ELECTRICAL HIGH-VOLTAGE EQUIPMENT
IN HIGH-VOLTAGE SUBSTATIONS –
COMMON RECOMMENDATIONS FOR PRODUCT STANDARDS
1 Scope
IEC Guide 111 is a horizontal publication which gives guidance for the harmonization of
product and system standards within substations where the highest voltage for equipment is
higher than 1 kV. It primarily addresses conventional a.c. equipment which is found in high-
voltage (HV) substations in most cases.
This Guide contains recommendations for common specifications for all HV substation product
standards, each of which is augmented by the technical background specific to each TC, which
naturally retains freedom in its technical choices.
Where HV power electronic equipment is part of an HV substation, for example, HVDC or SVC,
economics and technology dictate a deviation from common clauses as standardized for a.c.
equipment. However, when developing product standards for HV power electronic equipment
for use in HV substations, the common recommendations of this Guide should be adopted as
far as possible.
Clearly, any specification in this guide which is inapplicable to a certain type of product,
because of that product's inherent characteristics, for example, should not be taken into
account when writing standards for that type of product.
2 Reference documents
IEC 60027-1, Letter symbols to be used in electrical technology – Part 1: General
IEC 60038, IEC standard voltages
IEC 60059, IEC standard current ratings
IEC 60060-1, High-voltage test techniques – Part 1: General definitions and test requirements
IEC 60068 (all parts), Environmental testing
IEC 60068-2-18, Environmental testing – Part 2-18: Tests – Test R and guidance: Water
IEC 60068-2-75, Environmental testing – Part 2-75: Tests – Test Eh: Hammer tests
IEC 60071-1, Insulation co-ordination – Part 1: Definitions, principles and rules
IEC 60071-2, Insulation co-ordination – Part 2: Application guide
IEC 60216 (all parts), Electric insulating materials – Properties of thermal endurance
IEC 60296, Specification for unused mineral insulating oils for transformers and switchgear
IEC 60376, Specification and acceptance of new sulphur hexafluoride
IEC 60417 (all parts), Graphical symbols for use on equipment

Guide 111 ¤ IEC:2004(E) – 7 –
IEC 60480, Guide to the checking of sulphur hexafluoride (SF ) taken from electrical equipment
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60664-1, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests
IEC 60694, Common specifications for high-voltage switchgear and controlgear standards
IEC 60695, Fire hazard testing
IEC 60721 (all parts), Classification of environmental conditions
IEC 60721-1, Classification of environmental conditions – Part 1: Environmental parameters
and their severities
IEC 60721-2-2, Classification of environmental conditions – Part 2-2: Environmental conditions
appearing in nature – Precipitation and wind
IEC 60721-2-4, Classification of environmental conditions – Part 2-4: Environmental conditions
appearing in nature -- Solar radiation and temperature
IEC 60721-2-6, Classification of environmental conditions – Part 2-6: Environmental conditions
appearing in nature – Earthquake vibration and shock
IEC 60826, Loading and strength of overhead transmission lines
IEC 60867, Insulating liquids – Specifications for unused liquids based on synthetic aromatic
hydrocarbons
IEC 60943, Guidance concerning the permissible temperature rise for parts of electrical
equipment, in particular for terminals
IEC 61000-6-5, Electromagnetic compatibility (EMC) – Part 6-5: Generic standards – Immunity
for power station and substation environments
IEC 61180-1, High-voltage test techniques for low-voltage equipment – Part 1: Definitions, test
and procedure requirements
IEC 62155: Hollow pressurized and unpressurized ceramic and glass insulators for use in
electrical equipment with rated voltage greater than 1 000 V
CISPR 11, Industrial scientific and medical (ISM) radio-frequency equipment – Electromagnetic
disturbance characteristics – Limits and methods of measurement
CISPR 18-2, Radio interference characteristics of overhead power lines on high-voltage
equipment – Part 2: Methods of measurement and
...