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.

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.

General Information

Status
Published
Publication Date
21-Jun-2022
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
22-Jun-2022
Ref Project

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IEC 62271-202:2022 - High-voltage switchgear and controlgear - Part 202: AC prefabricated substations for rated voltages above 1 kV and up to and including 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
IEC 62271-202:2022-06(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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

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
---------------------- Page: 3 ----------------------
– 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

5.3 Rated insulation level (U , U , U ) ....................................................................... 22

d p s

5.4 Rated frequency (f ) .............................................................................................. 23

5.5 Rated continuous current (I ) ................................................................................ 23

5.6 Rated short-time withstand current (I ) ................................................................. 23

5.6.101 Rated short-time withstand current of high-voltage switchgear and

controlgear and high-voltage interconnection (I ) .......................................... 23

5.6.102 Rated short-time phase to earth withstand current (I ) ................................. 24

5.6.103 Rated short-time withstand currents of low-voltage switchgear and

controlgear and low-voltage interconnection (I ) ......................................... 24

5.7 Rated peak withstand current (I ) ......................................................................... 24

5.7.101 Rated peak phase to earth withstand current (I ) ......................................... 24

5.7.102 Rated peak withstand currents of low-voltage switchgear and

controlgear and low-voltage interconnection (I ) .......................................... 24

5.8 Rated duration of short-circuit (t ) ......................................................................... 24

---------------------- Page: 4 ----------------------
IEC 62271-202:2022 © IEC 2022 – 3 –

5.8.101 Rated duration of short-circuit (t ) ................................................................. 25

5.8.102 Rated duration of phase to earth short-circuit (t ) ........................................ 25

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

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

---------------------- Page: 5 ----------------------
– 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

7.2.8 Tests of switchgear and controlgear of U > 245 kV ....................................... 41

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

---------------------- Page: 6 ----------------------
IEC 62271-202:2022 © IEC 2022 – 5 –

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

---------------------- Page: 7 ----------------------
– 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 .....................................
...

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