IEC 62271-202:2022
(Main)High-voltage switchgear and controlgear - Part 202: AC prefabricated substations for rated voltages above 1 kV and up to and including 52 kV
High-voltage switchgear and controlgear - Part 202: AC prefabricated substations for rated voltages above 1 kV and up to and including 52 kV
IEC 62271-202:2022 specifies the service conditions, rated characteristics, general structural requirements and test methods of enclosed high-voltage prefabricated substations. These prefabricated substations are cable-connected to AC high-voltage networks with an operating voltage up to and including 52 kV and power frequencies up to and including 60 Hz. They can be manually operated from inside (walk-in type) or from outside (non-walk-in type). They are designed for outdoor installation at locations with public accessibility and where protection of personnel is provided.
This third edition cancels and replaces the second edition published in 2014. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
the whole document contents and structure are reviewed with due consideration of IEC 62271-1:2017;
modification of the title and scope to include high-voltage switchgear prefabricated substations;
inclusion of CEADS as a possible component of MV/LV prefabricated substation;
in 7.2.101, the possible influence of surrounding elements on the dielectric performance of high-voltage components as high-voltage switchgear and controlgear and high-voltage interconnections non-metal-enclosed or without earthed screen are now considered;
new informative Annex G with testing procedure to evaluate the impact of solar radiation in temperatures inside the enclosure and how to apply it;
new informative Annex H for appropriate consideration of installation conditions of electronic equipment;
the rated power of a prefabricated substation is now defined as a three-parameter rated value. See 5.101.1;
minimum dimensions for access doors to the prefabricated substation in 6.104.4 and for free height of operation aisle in 6.105.3 have been introduced;
continuous current (temperature rise) test methods have been revised/clarified where necessary;
Figure D.1, which shows the mineral-oil-immersed power transformer load factor inside the enclosure, has been corrected.
The contents of the corrigendum of August 2023 have been included in this copy.
Appareillage à haute tension - Partie 202: Postes préfabriqués pour courant alternatif de tensions assignées supérieures à 1 kV et inférieures ou égales à 52 kV
L'IEC 62271-202:2022 spécifie les conditions de service, les caractéristiques assignées, les exigences structurelles générales et les méthodes d'essai applicables aux postes préfabriqués haute tension sous enveloppe. Ces postes préfabriqués sont connectés par câble à des réseaux haute tension à courant alternatif avec une tension de service inférieure ou égale à 52 kV et des fréquences de puissance inférieures ou égales à 60 Hz. Ces postes peuvent être manœuvrés de l'intérieur (à aire de manœuvre) ou de l'extérieur (sans aire de manœuvre). Ils sont conçus pour une installation extérieure en des emplacements accessibles au public et ils assurent la protection du personnel.
Cette troisième édition annule et remplace la deuxième édition, parue en 2014. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
révision du contenu et de la structure de l'ensemble du document avec prise en considération toute particulière de l’IEC 62271-1:2017;
modification du titre et du domaine d’application afin d’inclure les postes préfabriqués de connexion haute tension;
inclusion d’un ECEPD comme composante potentielle d’un poste préfabriqué MT/BT;
au paragraphe 7.2.101, prise en considération nouvelle de l’influence potentielle des éléments environnants sur les performances diélectriques des composants à haute tension comme les appareillages à haute tension et les interconnexions haute tension sous enveloppe non métallique ou sans écran mis à la terre;
nouvelle Annex G informative avec procédure d'essai destinée à évaluer l’effet du rayonnement solaire sur les températures à l’intérieur de l’enveloppe et comment appliquer cette procédure;
nouvelle Annex H informative pour la prise en considération appropriée des conditions d’installation du matériel électronique;
la puissance assignée d’un poste préfabriqué est maintenant définie comme une valeur assignée à trois paramètres. Voir le paragraphe 5.101.1:
introduction de dimensions minimales pour les portes d’accès au poste préfabriqué (6.104.4) et pour la hauteur libre du couloir de manœuvre (6.105.3);
révision/clarification, lorsque cela est nécessaire, des méthodes d'essai (d’échauffement) au courant permanent;
correction de la Figure D.1, qui décrit le facteur de charge du transformateur de puissance immergé dans l’huile minérale à l’intérieur de l’enveloppe.
Le contenu du corrigendum d'août 2023 a été pris en considération dans cet exemplaire.
General Information
Relations
Overview
IEC 62271-202:2022 is an international standard published by the International Electrotechnical Commission (IEC) that governs high-voltage switchgear and controlgear, specifically the AC prefabricated substations with rated voltages above 1 kV and up to and including 52 kV. This third edition updates and replaces the 2014 second edition, introducing key revisions aligned with the latest industry requirements and IEC 62271-1:2017.
The standard defines the service conditions, rated characteristics, design, structural requirements, and testing methods for enclosed prefabricated substations connected via cables to AC high-voltage networks operating at frequencies up to 60 Hz. It covers both walk-in and non-walk-in types intended for outdoor installation in accessible public locations, ensuring personnel protection and operational reliability.
Key Topics
Service Conditions and Ratings
The standard specifies both normal and special service conditions including temperature, humidity, altitude, pollution levels, vibrations, and wind speed, to ensure substations perform safely under diverse environmental scenarios.
It defines rated parameters such as:- Rated voltage and insulation levels
- Rated continuous current and short-time withstand currents
- Rated peak withstand current and short-circuit duration
- Rated power of the prefabricated substation, now detailed as a three-parameter value for enhanced clarity.
Design and Construction
Structural requirements cover enclosure design, including fire behavior, ventilation, protection against mechanical stress, electromagnetic compatibility (EMC), and corrosion resistance.
The standard requires appropriate earthing, insulation, auxiliary and control equipment protections, and door/access dimensions to ensure operational safety and maintenance ease.
New minimum dimensions for access doors and operation aisles have been introduced.Testing Methods and Type Tests
IEC 62271-202:2022 details comprehensive testing procedures, including:- Dielectric tests considering influence of environmental elements and surrounding components
- Continuous current (temperature rise) tests
- Internal arc fault resistance tests for personnel and equipment safety
- Newly added tests for evaluating solar radiation impact on enclosure temperatures and installation conditions for electronic equipment.
Updated Technical Elements
The document incorporates:- Inclusion of CEADS (Combined Electrical Apparatus for Distribution Substations) components for medium/low voltage prefabricated substations
- Consideration of non-metal-enclosed or shieldless high-voltage interconnections and their dielectric performance
- Corrections in transformer load factor illustrations to improve accuracy.
Applications
IEC 62271-202:2022 is essential for stakeholders involved in the design, manufacturing, testing, and installation of outdoor AC prefabricated substations used in:
- Electricity distribution networks with voltages from medium to high voltage (1 kV to 52 kV)
- Urban and rural power distribution systems requiring compact, reliable prefabricated equipment
- Publicly accessible outdoor installation sites demanding stringent safety and environmental protections
- Organizations specifying compliant switchgear and controlgear equipment for utilities and industrial power systems
By adhering to this standard, manufacturers and operators can ensure high quality, safety, and interoperable prefabricated substations that meet international regulatory requirements and withstand demanding operational environments.
Related Standards
- IEC 62271-1:2017 – General definitions, service conditions, and construction standards for high-voltage switchgear and controlgear, providing foundational guidelines referenced in IEC 62271-202.
- IEC 62271 Series – The broader family of standards covering high-voltage switchgear technology including measurement, testing, and various apparatus.
- IEC 60076 – Standards governing power transformers, which commonly form integral components within prefabricated substations.
- IEC 60529 – Standard for degrees of protection (IP Code) by enclosures relevant for design and testing of prefabricated substation cabinets.
- IEC 61000 – Series addressing electromagnetic compatibility (EMC) pertinent to controlgear and switchgear performance.
Keywords: IEC 62271-202, high-voltage prefabricated substations, AC switchgear, controlgear standards, outdoor power substations, medium voltage switchgear, rated voltage 52 kV, electrical substation design, IEC standards for substations, dielectric testing, internal arc fault testing
Frequently Asked Questions
IEC 62271-202:2022 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "High-voltage switchgear and controlgear - Part 202: AC prefabricated substations for rated voltages above 1 kV and up to and including 52 kV". This standard covers: IEC 62271-202:2022 specifies the service conditions, rated characteristics, general structural requirements and test methods of enclosed high-voltage prefabricated substations. These prefabricated substations are cable-connected to AC high-voltage networks with an operating voltage up to and including 52 kV and power frequencies up to and including 60 Hz. They can be manually operated from inside (walk-in type) or from outside (non-walk-in type). They are designed for outdoor installation at locations with public accessibility and where protection of personnel is provided. This third edition cancels and replaces the second edition published in 2014. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: the whole document contents and structure are reviewed with due consideration of IEC 62271-1:2017; modification of the title and scope to include high-voltage switchgear prefabricated substations; inclusion of CEADS as a possible component of MV/LV prefabricated substation; in 7.2.101, the possible influence of surrounding elements on the dielectric performance of high-voltage components as high-voltage switchgear and controlgear and high-voltage interconnections non-metal-enclosed or without earthed screen are now considered; new informative Annex G with testing procedure to evaluate the impact of solar radiation in temperatures inside the enclosure and how to apply it; new informative Annex H for appropriate consideration of installation conditions of electronic equipment; the rated power of a prefabricated substation is now defined as a three-parameter rated value. See 5.101.1; minimum dimensions for access doors to the prefabricated substation in 6.104.4 and for free height of operation aisle in 6.105.3 have been introduced; continuous current (temperature rise) test methods have been revised/clarified where necessary; Figure D.1, which shows the mineral-oil-immersed power transformer load factor inside the enclosure, has been corrected. The contents of the corrigendum of August 2023 have been included in this copy.
IEC 62271-202:2022 specifies the service conditions, rated characteristics, general structural requirements and test methods of enclosed high-voltage prefabricated substations. These prefabricated substations are cable-connected to AC high-voltage networks with an operating voltage up to and including 52 kV and power frequencies up to and including 60 Hz. They can be manually operated from inside (walk-in type) or from outside (non-walk-in type). They are designed for outdoor installation at locations with public accessibility and where protection of personnel is provided. This third edition cancels and replaces the second edition published in 2014. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: the whole document contents and structure are reviewed with due consideration of IEC 62271-1:2017; modification of the title and scope to include high-voltage switchgear prefabricated substations; inclusion of CEADS as a possible component of MV/LV prefabricated substation; in 7.2.101, the possible influence of surrounding elements on the dielectric performance of high-voltage components as high-voltage switchgear and controlgear and high-voltage interconnections non-metal-enclosed or without earthed screen are now considered; new informative Annex G with testing procedure to evaluate the impact of solar radiation in temperatures inside the enclosure and how to apply it; new informative Annex H for appropriate consideration of installation conditions of electronic equipment; the rated power of a prefabricated substation is now defined as a three-parameter rated value. See 5.101.1; minimum dimensions for access doors to the prefabricated substation in 6.104.4 and for free height of operation aisle in 6.105.3 have been introduced; continuous current (temperature rise) test methods have been revised/clarified where necessary; Figure D.1, which shows the mineral-oil-immersed power transformer load factor inside the enclosure, has been corrected. The contents of the corrigendum of August 2023 have been included in this copy.
IEC 62271-202:2022 is classified under the following ICS (International Classification for Standards) categories: 29.130.10 - High voltage switchgear and controlgear. The ICS classification helps identify the subject area and facilitates finding related standards.
IEC 62271-202:2022 has the following relationships with other standards: It is inter standard links to IEC 62271-202:2022/COR1:2023, IEC 62271-202:2014/COR1:2015, IEC 62271-202:2014. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase IEC 62271-202:2022 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of IEC standards.
Standards Content (Sample)
IEC 62271-202 ®
Edition 3.0 2022-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
High-voltage switchgear and controlgear –
Part 202: AC prefabricated substations for rated voltages above 1 kV and up to
and including 52 kV
Appareillage à haute tension –
Partie 202: Postes préfabriqués pour courant alternatif de tensions assignées
supérieures à 1 kV et inférieures ou égales à 52 kV
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IEC 62271-202 ®
Edition 3.0 2022-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
High-voltage switchgear and controlgear –
Part 202: AC prefabricated substations for rated voltages above 1 kV and up to
and including 52 kV
Appareillage à haute tension –
Partie 202 : Postes préfabriqués pour courant alternatif de tensions assignées
supérieures à 1 kV et inférieures ou égales à 52 kV
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.10 ISBN 978-2-8322-1609-5
– 2 – IEC 62271-202:2022 © IEC 2022
CONTENTS
FOREWORD . 9
INTRODUCTION . 11
1 Scope . 12
2 Normative references . 13
3 Terms and definitions . 15
3.1 General terms and definitions . 15
3.2 Assemblies of switchgear and controlgear . 15
3.3 Parts of assemblies . 15
3.4 Switching devices . 16
3.5 Parts of switchgear and controlgear . 17
3.6 Operational characteristics of switchgear and controlgear . 17
3.7 Characteristic quantities . 18
3.8 Index of definitions . 18
4 Normal and special service conditions . 18
4.1 Normal service conditions . 18
4.1.1 General . 18
4.1.2 Indoor switchgear and controlgear . 19
4.1.3 Outdoor switchgear and controlgear . 19
4.1.101 Low-voltage switchgear and controlgear . 19
4.1.102 Power transformer . 19
4.2 Special service conditions . 20
4.2.1 General . 20
4.2.2 Altitude . 20
4.2.3 Exposure to pollution . 20
4.2.4 Temperature and humidity . 21
4.2.5 Exposure to abnormal vibrations, shock or tilting . 21
4.2.6 Wind speed . 21
4.2.7 Other parameters . 21
5 Ratings . 21
5.1 General . 21
5.2 Rated voltage (U ) . 22
r
5.3 Rated insulation level (U , U , U ) . 22
d p s
5.4 Rated frequency (f ) . 23
r
5.5 Rated continuous current (I ) . 23
r
5.6 Rated short-time withstand current (I ) . 23
k
5.6.101 Rated short-time withstand current of high-voltage switchgear and
controlgear and high-voltage interconnection (I ) . 23
k
5.6.102 Rated short-time phase to earth withstand current (I ) . 24
ke
5.6.103 Rated short-time withstand currents of low-voltage switchgear and
controlgear and low-voltage interconnection (I ) . 24
cw
5.7 Rated peak withstand current (I ) . 24
p
5.7.101 Rated peak phase to earth withstand current (I ) . 24
pe
5.7.102 Rated peak withstand currents of low-voltage switchgear and
controlgear and low-voltage interconnection (I ) . 24
pk
5.8 Rated duration of short-circuit (t ) . 24
k
5.8.101 Rated duration of short-circuit (t ) . 25
k
5.8.102 Rated duration of phase to earth short-circuit (t ) . 25
ke
5.8.103 Rated duration of short-circuits for low-voltage switchgear and
controlgear and low-voltage interconnection . 25
5.8.104 Rated duration of short-circuits for power transformers . 25
5.9 Rated supply voltage of auxiliary and control circuits (U ) . 25
a
5.10 Rated supply frequency of auxiliary and control circuits . 25
5.11 Rated pressure of compressed gas supply for controlled pressure systems . 25
5.101 Rated power of prefabricated substation and class of enclosure . 25
5.101.1 Rated power of the prefabricated substation . 25
5.101.2 Rated class of enclosure . 26
5.102 Ratings of the internal arc classification (IAC) . 26
5.102.1 General . 26
5.102.2 Types of accessibility (A, B, AB) . 26
5.102.3 Rated arc fault currents (I , I ) . 27
A Ae
5.102.4 Rated arc fault duration (t , t ) . 27
A Ae
6 Design and construction . 27
6.1 Requirements for liquids in switchgear and controlgear . 28
6.2 Requirements for gases in switchgear and controlgear . 28
6.3 Earthing of switchgear and controlgear . 28
6.4 Auxiliary and control equipment and circuits . 29
6.4.1 General . 29
6.4.2 Protection against electric shock . 29
6.4.3 Components installed in enclosures . 30
6.5 Dependent power operation . 30
6.6 Stored energy operation . 30
6.7 Independent unlatched operation (independent manual or power operation) . 31
6.8 Manually operated actuators . 31
6.9 Operation of releases . 31
6.10 Pressure/level indication . 31
6.11 Nameplates. 31
6.12 Locking devices . 31
6.13 Position indication . 31
6.14 Degrees of protection provided by enclosures . 31
6.15 Creepage distances for outdoor insulators . 32
6.16 Gas and vacuum tightness . 32
6.17 Tightness for liquid systems . 32
6.18 Fire hazard (flammability) . 32
6.19 Electromagnetic compatibility (EMC) . 32
6.20 X-ray emission . 32
6.21 Corrosion . 32
6.22 Filling levels for insulation, switching and/or operation . 32
6.101 Protection of the prefabricated substation against mechanical stress . 33
6.102 Protection of the environment due to internal defects . 33
6.103 Internal arc fault . 34
6.104 Enclosure . 34
6.104.1 General . 34
6.104.2 Fire behaviour . 35
– 4 – IEC 62271-202:2022 © IEC 2022
6.104.3 Environmental considerations . 36
6.104.4 Covers and doors . 36
6.104.5 Ventilation openings . 37
6.104.6 Partitions . 37
6.105 Other provisions. 37
6.105.1 Provisions for dielectric tests on cables . 37
6.105.2 Accessories . 37
6.105.3 Operation aisle . 38
6.105.4 Labels . 38
6.105.5 Provisions for on-site assembly of prefabricated substation . 38
6.106 Sound emission . 38
6.107 Electromagnetic fields . 38
6.108 Solar radiation . 38
7 Type tests . 39
7.1 General . 39
7.1.1 Basics . 39
7.1.2 Information for identification of test objects . 40
7.1.3 Information to be included in type-test reports . 40
7.2 Dielectric tests . 40
7.2.1 General . 40
7.2.2 Ambient air conditions during tests . 41
7.2.3 Wet test procedure . 41
7.2.4 Arrangement of the equipment . 41
7.2.5 Criteria to pass the test . 41
7.2.6 Application of the test voltage and test conditions . 41
7.2.7 Tests of switchgear and controlgear of U ≤ 245 kV . 41
r
7.2.8 Tests of switchgear and controlgear of U > 245 kV . 41
r
7.2.9 Artificial pollution tests for outdoor insulators . 41
7.2.10 Partial discharge tests . 41
7.2.11 Dielectric tests on auxiliary and control circuits . 41
7.2.12 Voltage test as condition check . 42
7.2.101 Tests on the high-voltage components . 42
7.2.102 Tests on low-voltage interconnection . 43
7.3 Radio interference voltage (RIV) test . 44
7.4 Resistance measurement . 44
7.4.1 Measurement of the resistance of auxiliary contacts class 1 and class 2. 44
7.4.2 Measurement of the resistance of auxiliary contacts class 3 . 44
7.4.3 Electrical continuity of earthed metallic parts test . 44
7.4.4 Resistance measurement of contacts and connections in the main
circuit as a condition check . 45
7.5 Continuous current tests . 45
7.5.101 General . 45
7.5.102 Test conditions . 46
7.5.103 Test methods . 47
7.5.104 Measurements . 51
7.5.105 Acceptance criteria . 53
7.5.106 Continuous current test under solar radiation . 54
7.6 Short-time withstand current and peak withstand current tests . 54
7.7 Verification of the protection . 55
7.8 Tightness tests . 55
7.9 Electromagnetic compatibility tests (EMC) . 55
7.10 Additional tests on auxiliary and control circuits . 55
7.10.1 General . 55
7.10.2 Functional tests . 55
7.10.3 Verification of the operational characteristics of auxiliary contacts . 56
7.10.4 Environmental tests . 56
7.10.5 Dielectric test . 56
7.11 X-radiation test for vacuum interrupters . 56
7.101 Calculations and mechanical tests . 56
7.101.1 Wind pressure . 56
7.101.2 Roof loads . 56
7.101.3 Mechanical impacts . 56
7.101.4 Handling . 56
7.102 Internal arc test . 57
7.102.1 General . 57
7.102.2 Test conditions . 57
7.102.3 Arrangement of the equipment . 58
7.102.4 Test procedure . 58
7.102.5 Criteria to pass the test . 58
7.102.6 Test report . 60
7.102.7 Transferability of tests results . 60
7.103 Measurement or calculation of electromagnetic fields . 61
8 Routine tests . 61
8.1 General . 61
8.2 Dielectric test on the main circuit . 61
8.3 Test on auxiliary and control circuits . 61
8.3.1 Inspection of auxiliary and control circuits, and verification of conformity
to the circuit diagrams and wiring diagrams . 61
8.3.2 Functional tests . 61
8.3.3 Verification of protection against electric shock . 61
8.3.4 Dielectric tests . 62
8.4 Measurement of the resistance of the main circuit . 62
8.5 Tightness test . 62
8.6 Design and visual checks . 62
8.101 Other functional tests . 62
8.102 Tests after assembly on site . 62
9 Guide to the selection of switchgear and controlgear (informative) . 62
9.101 General . 62
9.102 Selection of rated values . 63
9.103 Selection of class of enclosure . 63
9.104 Internal arc fault . 64
9.104.1 General . 64
9.104.2 Causes and preventive measures . 64
9.104.3 Supplementary protective measures . 64
9.104.4 Considerations for the selection and installation . 66
9.104.5 IAC classification . 66
9.105 Summary of technical requirements and ratings . 67
10 Information to be given with enquiries, tenders and orders (informative) . 73
– 6 – IEC 62271-202:2022 © IEC 2022
10.1 General . 73
10.2 Information with enquiries and orders . 73
10.3 Information with tenders . 74
11 Transport, storage, installation, operating instructions and maintenance. 74
11.1 General . 74
11.2 Conditions during transport, storage and installation . 75
11.3 Installation . 75
11.3.1 General . 75
11.3.2 Unpacking and lifting . 75
11.3.3 Assembly . 75
11.3.4 Mounting . 75
11.3.5 Connections . 76
11.3.6 Information about gas and gas mixtures for controlled and closed
pressure systems . 76
11.3.7 Final installation inspection . 76
11.3.8 Basic input data by the user . 76
11.3.9 Basic input data by the manufacturer . 76
11.4 Operating instructions . 76
11.5 Maintenance . 76
12 Safety . 77
12.101 General . 77
12.102 Electrical aspects . 77
12.103 Mechanical aspects . 77
12.104 Thermal aspects . 77
12.105 Internal arc aspects . 77
13 Influence of the product on the environment . 77
Annex A (normative) Internal arc fault – Method to verify the internal arc classification
(IAC) . 78
A.1 General . 78
A.2 Room simulation . 78
A.3 Indicators (for assessing the thermal effects of the gases) . 78
A.3.1 General . 78
A.3.2 Arrangement of indicators . 80
A.4 Tolerances for geometrical dimensions of test arrangements . 86
A.5 Test parameters . 86
A.6 Test procedure . 87
Annex B (normative) Test to verify the sound level of a high-voltage/low-voltage
transformer prefabricated substation . 92
B.1 Purpose . 92
B.2 Test object . 92
B.3 Test method . 92
B.4 Measurements . 92
B.5 Presentation and calculation of the results . 92
Annex C (normative) Mechanical impact test. 94
C.1 Test for the verification of the resistance to mechanical impact . 94
C.2 Apparatus for the verification of the protection against mechanical damage . 94
Annex D (informative) Rating of power transformers in an enclosure. 96
D.1 General . 96
D.2 Mineral-oil-immersed power transformer . 96
D.3 Dry-type power transformer . 97
D.4 Example. 101
Annex E (informative) Examples of earthing arrangements . 104
Annex F (informative) Characteristics of enclosure materials . 107
F.1 Metals . 107
F.1.1 Coatings . 107
F.1.2 Paints . 107
F.2 Concrete . 107
Annex G (informative) Evaluation of the impact of solar radiation – Simulated solar
radiation continuous current test . 109
G.1 General . 109
G.2 Test method . 109
G.2.1 General . 109
G.2.2 Test parameters, equipment and preparation . 109
G.2.3 Test procedure and application of test currents. 111
G.2.4 Measurements . 111
G.3 Evaluation of the solar radiation effects . 112
G.3.1 Evaluation of solar radiation effects on the temperature rise of power
transformer . 112
G.3.2 Evaluation of solar radiation effects on the temperature rise of
components other than the power transformer . 112
G.4 Application considerations . 112
Annex H (informative) Installation conditions of electronic equipment . 114
H.1 General . 114
H.2 Accessibility . 114
H.3 Application of air temperature measurements inside the prefabricated
substation . 115
Bibliography . 116
Figure 1 – Measurement of power transformer temperature rise in ambient air: ∆t . 46
Figure 2 – Measurement of power transformer temperature rise in an enclosure: ∆t . 46
Figure 3 – Diagram of the preferred continuous current test method . 48
Figure 4 – Diagram of the continuous current test alternative method . 49
Figure 5 – Diagram for open-circuit test . 50
Figure 6 – Example of air temperature measurement locations inside a non-walk-in
type prefabricated substation . 53
Figure A.1 – Mounting frame for vertical indicators . 79
Figure A.2 – Horizontal indicators . 79
Figure A.3 – Arrangement of indicators . 86
Figure A.4 – Selection of tests on high-voltage switchgear and controlgear for
class IAC-A . 87
Figure A.5 – Selection of tests on high-voltage switchgear and controlgear for
class IAC-B . 88
Figure A.6 – Selection of tests on high-voltage interconnections for class IAC-A. 89
Figure A.7 – Selection of tests on high-voltage interconnections for class IAC-B. 90
Figure C.1 – Impact test apparatus . 95
– 8 – IEC 62271-202:2022 © IEC 2022
Figure D.1 – Mineral-oil-immersed power transformer load factor inside of the
enclosure related to ambient air at the location and top-oil and winding temperature
rise limits . 97
Figure D.2 – Dry-type power transformer load factor outside of the enclosure . 97
Figure D.3 – Insulation class 105 °C (A) dry-type power transformers load factor in an
enclosure . 98
Figure D.4 – Insulation class 120 °C (E) dry-type power transformers load factor in an
enclosure . 99
Figure D.5 – Insulation class 130 °C (B) dry-type power transformers load factor in an
enclosure . 99
Figure D.6 – Insulation class 155 °C (F) dry-type power transformers load factor in an
enclosure . 100
Figure D.7 – Insulation class 180 °C (H) dry-type power transformers load factor in an
enclosure . 100
Figure D.8 – Insulation class 200 °C (H) dry-type power transformers load factor in an
enclosure . 101
Figure D.9 – Insulation class 220 °C (H) dry-type power transformers load factor in an
enclosure . 101
Figure E.1 – Example of earthing arrangement . 104
Figure E.2 – Example of earthing arrangement . 105
Figure E.3 – Example with the framework serving as part of the main earthing
conductor . 106
Figure G.1 – Indicative arrangement of laboratory radiation sources (e.g. radiant heat
lamps) for continuous current test with simulated solar radiation . 110
Table 1 – Synthetic material characteristics . 35
Table 2 – Type tests . 40
Table 3 – Locations, causes and examples of measures decreasing the probability of
internal arcs . 65
Table 4 – Single phase-to-earth arc fault current depending on the network neutral
earthing . 67
Table 5 – Summary of technical requirements, characteristics and ratings relevant for
prefabricated substations . 68
Table F.1 – Treatment of coatings . 107
Table F.2 – Tests of coatings . 107
Table F.3 – Test of concrete . 108
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 202: AC prefabricated substations for rated voltages above 1 kV and
up to and including 52 kV
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. Internatio
...
記事タイトル：IEC 62271-202:2022 - 高圧スイッチギアおよび制御ギア - Part 202: 1 kV以上52 kV以下の定格電圧のための交流プレハブ変電所 記事内容：IEC 62271-202:2022は、密閉された高圧プレハブ変電所のサービス条件、定格特性、一般的な構造要件および試験方法を規定しています。これらのプレハブ変電所は、最大52 kVまでの動作電圧と最大60 Hzのパワーフリークエンシーを持つ交流高圧ネットワークにケーブルで接続されます。内部（ウォークインタイプ）または外部（ノンウォークインタイプ）から手動で操作することができます。一般公開可能な場所に屋外設置でき、人員保護が提供されるよう設計されています。 本第3版は、2014年に発行された第2版を取り消し、置き換えるものです。この版は、技術的な改訂を行っています。 この版には、前版と比較して以下の重要な技術的変更が含まれています： IEC 62271-1:2017に十分な考慮をして、文書の内容と構造全体が見直されました。 タイトルおよび範囲が高圧スイッチギアプレハブ変電所を含めるよう修正されました。 MV/LVプレハブ変電所の可能な構成要素としてCEADSが追加されました。 7.2.101では、高圧スイッチギアおよび制御ギアおよび高圧間接接続非金属封じ込めまたは地続きがない場合の周囲要素の絶縁特性への影響を考慮するように改訂されました。 新しい情報提供付録Gでは、筐体内部の温度への太陽放射の影響を評価するための試験手順とその適用方法が記載されています。 新しい情報提供付録Hでは、電子機器の設置条件を適切に考慮するための内容が追加されています。 プレハブ変電所の定格出力は、3つのパラメーターで定義されるようになりました。5.101.1を参照。 プレハブ変電所のアクセスドアの最小寸法（6.104.4）および操作通路の自由高さ（6.105.3）の要件が導入されました。 連続電流（温度上昇）試験方法は、必要な場合に改訂／明確化されました。 筐体内の鉱油浸漬型パワートランスの負荷率を示す図D.1が修正されました。
IEC 62271-202:2022 is a standard that specifies the requirements and test methods for high-voltage prefabricated substations. These substations are used in AC high-voltage networks with voltages up to 52 kV and frequencies up to 60 Hz. They can be operated manually from inside or outside and are designed for outdoor installation in accessible areas with personnel protection. This third edition of the standard replaces the second edition published in 2014 and includes several technical revisions. The document's contents and structure have been reviewed in consideration of IEC 62271-1:2017. The title and scope have been modified to include high-voltage switchgear prefabricated substations. The addition of CEADS as a possible component of the substations has been included. The influence of surrounding elements on the dielectric performance of high-voltage components is now considered. Informative Annexes G and H have been added to address testing procedures for evaluating the impact of solar radiation and installation conditions of electronic equipment, respectively. The rated power of the substations is now defined as a three-parameter rated value. Minimum dimensions for access doors and operation aisle height have been introduced. The continuous current test methods have been revised and clarified where necessary. Finally, Figure D.1, which depicts the load factor for mineral-oil-immersed power transformers inside the enclosure, has been corrected.
기사 제목: IEC 62271-202:2022 - 고압 스위치기어 및 제어기어 - 파트 202: 1 kV 이상 52 kV 이하의 정격 전압용 교류 사전 제조 서브스테이션 기사 내용: IEC 62271-202:2022는 봉인된 고압 사전 제조 서브스테이션의 서비스 조건, 정격 특성, 일반 구조 요구 사항 및 시험 방법을 명시합니다. 이러한 사전 제조 서브스테이션은 최대 52 kV까지의 작동 전압과 최대 60 Hz의 전력 주파수를 갖는 교류 고압 네트워크에 케이블로 연결됩니다. 내부(워크인) 또는 외부(비워크인)에서 수동으로 작동할 수 있습니다. 이들은 일반인이 접근할 수 있고 인원 보호가 제공되는 공공 장소에야 설치될 수 있도록 설계되었습니다. 이번 세 번째 판은 2014년에 발표된 두 번째 판을 취소하고 대체합니다. 이번 판은 기술적인 개정으로 이루어졌습니다. 이번 판에는 이전 판에 비해 다음과 같은 중요한 기술적 변경 사항이 포함되어 있습니다: 전체 문서의 내용과 구조는 IEC 62271-1:2017을 적절히 고려하여 검토되었습니다. 제목과 범위가 고압 스위치기어 사전 제조 서브스테이션을 포함하도록 수정되었습니다. MV/LV 사전 제조 서브스테이션의 가능한 구성 요소로 CEADS가 포함되었습니다. 7.2.101에서 주변 요소가 고압 스위치기어 및 제어기어와 비금속 봉인 또는 무전지 배선의 전기 절연 성능에 미치는 영향을 고려하도록 개정되었습니다. 신규 정보성 부록 G에는 보관장치 내부의 온도에 대한 태양 복사의 영향을 평가하기 위한 시험 절차 및 그 적용 방법이 포함되었습니다. 신규 정보성 부록 H는 전자 장비의 설치 조건을 적절히 고려하기 위한 내용을 포함하고 있습니다. 사전 제조 서브스테이션의 정격 전력은 이제 3개 매개변수 정격값으로 정의됩니다. 5.101.1 참조. 사전 제조 서브스테이션의 접근문 최소 크기(6.104.4) 및 작동 통로의 높이(6.105.3)에 대한 최소치가 도입되었습니다. 지속적인 전류(온도 상승) 시험 방법은 필요한 경우 개정/명확히 되었습니다. 보관장치 내부에서의 미네랄 기름 침투 전력 변압기의 부하 계수를 보여주는 Figure D.1이 수정되었습니다.
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