High-voltage switchgear and controlgear - Part 102: Alternating current disconnectors and earthing switches (IEC 62271-102:2018)

This part of IEC 62271 applies to alternating current disconnectors and earthing switches,
designed for indoor and outdoor installations for nominal voltages above 1 000 V and for
service frequencies up to and including 60 Hz.
It also applies to the operating devices of these disconnectors and earthing switches and their
auxiliary equipment.
Additional requirements for disconnectors and earthing switches in enclosed switchgear and
controlgear are given in IEC 62271-200, IEC 62271-201 and IEC 62271-203.
NOTE Disconnectors in which the fuse forms an integral part are not covered by this standard.
This document is also applicable to switching devices having disconnecting and/or earthing
functionalities apart from other functions, such as high-speed earthing switch, circuit-breaker
and switch-disconnector.

Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil 102: Wechselstrom-Trennschalter und -Erdungsschalter (IEC 62271-102:2018)

Appareillage à haute tension - Partie 102: Sectionneurs etsectionneurs de terre à courant alternatif (IEC 62271-102:2018)

L’IEC 62271-102:2018 s’applique aux sectionneurs et aux sectionneurs de terre à courant alternatif, conçus pour être installés à l’intérieur et à l’extérieur, pour des tensions nominales supérieures à 1 000 V et des fréquences de service inférieures ou égales à 60 Hz. Cette deuxième édition annule et remplace la première édition parue en 2001, l’Amendement 1:2011 et l’Amendement 2:2013. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:  adoption d’une nouvelle numérotation conformément à l’IEC 17/1025/RQ pour se conformer aux Directives ISO/IEC, Partie 2, et à l’IEEE C37.100.1; alignement de la numérotation des articles avec l’IEC 62271-1:2017: extension du Domaine d’application pour couvrir toutes les installations pour l’intérieur et pour l’extérieur. Prise en compte des appareils de connexion comportant, en plus d’autres fonctions, des fonctionnalités de déconnexion et/ou de mise à la terre couvertes par le présent document; transfert des caractéristiques assignées des Annexes B, C et E à l’Article 5; l’ordre des paragraphes correspond désormais à l’ordre des paragraphes de l’Article 7: affectation de nouvelles valeurs assignées au courant de transfert de barres et à la tension de transfert de barres; ajout d’une nouvelle classe d’endurance mécanique pour les sectionneurs de terre (M1); le paragraphe "Valeurs assignées d’endurance électrique pour les sectionneurs de terre" s’intitule désormais "Classification des sectionneurs de terre pour le pouvoir de fermeture en court-circuit; ajout d’un nouveau paragraphe avec des caractéristiques assignées pour la couche de glace; ajout d’un nouveau paragraphe avec classification du pouvoir d’établissement et de coupure de jeux de barres à vide; ajout de nouvelles exigences en matière de tenue pour les dispositifs de verrouillage; modification de la manière de se conformer aux exigences de la distance de sectionnement des sectionneurs; modification des exigences de conception et de construction des indicateurs de position, en alignant les exigences pour l’indication et la signalisation de position; modification de la valeur de l’effort de manœuvre; révision et modification si nécessaire des procédures d’essai et des critères de validation; modification des exigences relatives à la tension appliquée lors des essais monophasés sur les sectionneurs de terre à fermeture non simultanée; suppression des exigences non vérifiables; ajout d’un nouveau paragraphe pour soumettre à l’essai les dispositifs de verrouillage mécanique; réalisation obligatoire de l’essai aux températures haute et basse si les limites de température pour les conditions de service de l’appareil (définies par le constructeur) sont supérieures à 40 °C ou inférieures à -5 °C, et fourniture d’une procédure d’essai plus détaillée; réalisation d’essai matériellement possible sur chacune des technologies utilisées, favorisée par la procédure d’essai de vérification du bon fonctionnement de l’indicateur de position; ajout d’une nouvelle Annexe B intitulée: "Pouvoir d’établissement et de coupure de courant exigé des sectionneurs et des sectionneurs de terre";<

Visokonapetostne stikalne in krmilne naprave - 102. del: Ločilna stikala za izmenični tok in ozemljitvena stikala (IEC 62271-102:2018)

Ta del standarda IEC 62271 se uporablja za ločilna stikala za izmenični tok in ozemljitvena stikala za notranje in zunanje inštalacije za nazivne napetosti nad 1000 V in storitvene frekvence do in vključno s 60 Hz.
Prav tako se uporablja za krmilne naprave teh ločilnih in ozemljitvenih stikal ter njihovo dodatno opremo.
Dodatne zahteve za ločilna in ozemljitvena stikala v zaprtih stikalnih in krmilnih napravah so podane v standardih IEC 62271-200, IEC 62271-201 in IEC 62271-203.
OPOMBA Ločilna stikala, pri katerih je varovalka bistveni del, ne spadajo na področje uporabe tega standarda. Ta dokument se uporablja tudi za stikalne naprave s funkcijo prekinjanja in/ali ozemljitve, poleg drugih funkcij, kot so hitra ozemljitvena stikala, odklopniki in stikala/ločilna stikala.

General Information

Status
Published
Public Enquiry End Date
28-Sep-2017
Publication Date
10-Sep-2018
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
22-Aug-2018
Due Date
27-Oct-2018
Completion Date
11-Sep-2018

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil 102: Wechselstrom-Trennschalter und -Erdungsschalter (IEC 62271-102:2018)Appareillage à haute tension - Partie 102: Sectionneurs etsectionneurs de terre à courant alternatif (IEC 62271-102:2018)High-voltage switchgear and controlgear - Part 102: Alternating current disconnectors and earthing switches (IEC 62271-102:2018)29.130.10Visokonapetostne stikalne in krmilne napraveHigh voltage switchgear and controlgearICS:Ta slovenski standard je istoveten z:EN IEC 62271-102:2018SIST EN IEC 62271-102:2018en01-oktober-2018SIST EN IEC 62271-102:2018SLOVENSKI

STANDARDSIST EN 62271-102:2002/A2:2013SIST EN 62271-102:2002/AC:2015SIST EN 62271-102:2002SIST EN 62271-102:2002/A1:20111DGRPHãþD

SIST EN IEC 62271-102:2018
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN IEC 62271-102
August 2018 ICS 29.130.10; 29.130.99
Supersedes
EN 62271-102:2002
English Version
High-voltage switchgear and controlgear -

Part 102: Alternating current disconnectors and earthing switches (IEC 62271-102:2018)

Appareillage à haute tension -

Partie 102: Sectionneurs et sectionneurs de terre à courant alternatif (IEC 62271-102:2018)

Hochspannungs-Schaltgeräte und -Schaltanlagen -

Teil 102: Wechselstrom-Trennschalter und -Erdungsschalter (IEC 62271-102:2018) This European Standard was approved by CENELEC on 2018-06-19. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization

Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung CEN-CENELEC Management Centre: Rue de la Science 23,

B-1040 Brussels © 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 62271-102:2018 E SIST EN IEC 62271-102:2018

EN IEC 62271-102:2018 2 European foreword The text of document 17A/1173/FDIS, future edition 2 of IEC 62271-102, prepared by SC 17A "Switching devices" of IEC/TC 17 "High-voltage switchgear and controlgear" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 62271-102:2018.

The following dates are fixed: • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2019-03-19 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2021-06-19

This document supersedes EN 62271-102:2002.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice The text of the International Standard IEC 62271-102:2018 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60507:2013 NOTE Harmonized as EN 60507:2014 (not modified). IEC 60447:2004 NOTE Harmonized as EN 60447:2004 (not modified). IEC 60060-1:2010 NOTE Harmonized as EN 60060-1:2010 (not modified). SIST EN IEC 62271-102:2018

EN IEC 62271-102:2018 3 Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

NOTE 1

Where an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.

NOTE 2

Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu.

Publication Year Title EN/HD Year
IEC 60050-151 -

International Electrotechnical Vocabulary - Part 151: Electrical and magnetic devices - -

IEC 60050-441 -

International Electrotechnical Vocabulary (IEV) - Chapter 441: Switchgear, controlgear and fuses - -

IEC 60050-471 -
International Electrotechnical Vocabulary - Part 471: Insulators - -
IEC 60050-614 -

International electrotechnical vocabulary - Part 614: Generation, transmission and distribution of electricity - Operation - -

IEC 60071-2 -
Insulation co-ordination -
Part 2: Application guidelines EN IEC 60071-2 -
IEC 60137 -
Insulated bushings for alternating voltages above 1000 V EN 60137 -
IEC 60270 -
High-voltage test techniques - Partial discharge measurements EN 60270 -
IEC 60529 1989

Degrees of protection provided by enclosures (IP Code) EN 60529 corr. May 1991 1993 +A1 1999

+A1 2000
+A2 2013
+A2 2013
IEC 60865-1 -

Short-circuit currents - Calculation of effects - Part 1: Definitions and calculation methods EN 60865-1 -

IEC 62262 2002

Degrees of protection provided by enclosures for electrical equipment against external mechanical impacts (IK code) EN 62262 2002

IEC 62271-1 2017

High-voltage switchgear and controlgear - Part 1: Common specifications for alternating current switchgear and controlgear EN 62271-1 2017

SIST EN IEC 62271-102:2018
EN IEC 62271-102:2018 4 Publication Year Title EN/HD Year
IEC 62271-100 2008

High-voltage switchgear and controlgear - Part 100: Alternating current circuit-breakers EN 62271-100 2009

+A1 2012
+A1 2012
+A2 2017
+A2 2017
IEC 62271-101 2012

High-voltage switchgear and controlgear - Part 101: Synthetic testing EN 62271-101 2013

+A1 2017
- -
IEC 62271-200 2011

High-voltage switchgear and controlgear - Part 200: AC metal-enclosed switchgear and controlgear for rated voltages

above 1 kV and up to and including 52 kV EN 62271-200 2012
IEC 62271-201 2014

High-voltage switchgear and controlgear - Part 201: AC solid-insulation enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV EN 62271-201 2014

IEC 62271-203 2011

High-voltage switchgear and controlgear - Part 203: Gas-insulated metal-enclosed switchgear for rated voltages above 52 kV EN 62271-203 2012

IEC/TR 62271-305 -

High-voltage switchgear and controlgear - Part 305: Capacitive current switching capability of air-insulated disconnectors for rated voltages above 52 kV - -

ISO 2768-1 -
General tolerances -

Part 1: Tolerances for linear and angular dimensions without individual tolerance indications EN 22768-1 -

SIST EN IEC 62271-102:2018

IEC 62271-102 Edition 2.0 2018-05 INTERNATIONAL STANDARD NORME INTERNATIONALE High-voltage switchgear and controlgear –

Part 102: Alternating current disconnectors and earthing switches
Appareillage à haute tension –
Partie 102: Sectionneurs et sectionneurs de terre à courant alternatif

INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE

ICS 29.130.10; 29.130.99
ISBN 978-2-8322-5654-1
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale ®

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. SIST EN IEC 62271-102:2018 colourinside

– 2 – IEC 62271-102:2018 © IEC 2018 CONTENTS FOREWORD ........................................................................................................................... 9 1 Scope ............................................................................................................................ 12 2 Normative references .................................................................................................... 12 3 Terms and definitions .................................................................................................... 13 3.1 General terms and definitions ............................................................................... 13 3.2 Assemblies of switchgear and controlgear ............................................................ 14 3.3 Parts of assemblies .............................................................................................. 14 3.4 Switching devices ................................................................................................. 14 3.5 Parts of switching devices ..................................................................................... 15 3.6 Operation .............................................................................................................. 18 3.7 Characteristic quantities ....................................................................................... 19 3.8 Index of definitions ................................................................................................ 24 4 Normal and special service conditions ........................................................................... 26 5 Ratings .......................................................................................................................... 26 5.1 General ................................................................................................................. 26 5.2 Rated voltage (Ur) ................................................................................................ 27 5.3 Rated insulation level (Ud, Up, Us) ....................................................................... 27 5.4 Rated frequency (fr) .............................................................................................. 27 5.5 Rated continuous current (Ir) ................................................................................ 27 5.6 Rated short-time withstand current (Ik) ................................................................. 27 5.7 Rated peak withstand current (Ip) ......................................................................... 27 5.8 Rated duration of short-circuit (tk) ......................................................................... 28 5.9 Rated supply voltage of auxiliary and control circuits (Ua) .................................... 28 5.10 Rated supply frequency of auxiliary circuits and control circuits ............................ 28 5.11 Rated pressure of compressed gas supply for controlled pressure systems .......... 28 5.11.101 Rated pressure of compressed gas supply for insulation and/or switching ....................................................................................................... 28 5.11.102 Rated pressure of compressed gas supply for operation ................................ 28 5.101 Rated short-circuit making current (Ima) ............................................................... 28 5.102 Classification of earthing switches for short-circuit making .................................... 28 5.103 Rated contact zone ............................................................................................... 29 5.104 Rated static mechanical terminal load ................................................................... 29 5.105 Classification of disconnectors for mechanical endurance ..................................... 30 5.106 Classification of earthing switches for mechanical endurance ............................... 31 5.107 Rated ice-coating .................................................................................................. 31 5.108 Rated values of disconnectors for bus-transfer current switching .......................... 31 5.108.1 Rated bus-transfer current ............................................................................. 31 5.108.2 Rated bus-transfer voltage............................................................................. 32 5.109 Classification and rated values of earthing switches for induced current switching ............................................................................................................... 32 5.110 Classification and rated values of disconnectors for bus-charging current switching ............................................................................................................... 33 6 Design and construction ................................................................................................ 34 6.1 Requirements for liquids in disconnectors and earthing switches .......................... 34 6.2 Requirements for gases in disconnectors and earthing switches ........................... 34 6.3 Earthing of disconnectors and earthing switches ................................................... 34 SIST EN IEC 62271-102:2018

IEC 62271-102:2018 © IEC 2018 – 3 –

6.4 Auxiliary and control equipment and circuits ......................................................... 35 6.5 Dependent power operation .................................................................................. 35 6.6 Stored energy operation ........................................................................................ 35 6.7 Independent unlatched operation (independent manual or power operation) ......... 35 6.8 Manually operated actuators ................................................................................. 35 6.9 Operation of releases ............................................................................................ 35 6.10 Pressure/level indication ....................................................................................... 35 6.11 Nameplates........................................................................................................... 35 6.12 Locking devices .................................................................................................... 38 6.13 Position indication ................................................................................................. 38 6.14 Degree of protection provided by enclosures ........................................................ 38 6.15 Creepage distances for outdoor insulators ............................................................ 38 6.16 Gas and vacuum tightness .................................................................................... 38 6.17 Tightness for liquid systems .................................................................................. 38 6.18 Fire hazard (flammability) ..................................................................................... 38 6.19 Electromagnetic compatibility (EMC) ..................................................................... 38 6.20 X-ray emission ...................................................................................................... 38 6.21 Corrosion .............................................................................................................. 38 6.22 Filling levels for insulation, switching and/or operation .......................................... 39 6.101 Particular requirements for earthing switches ........................................................ 39 6.102 Requirements in respect of the isolating distance of disconnectors ....................... 39 6.103 Mechanical strength .............................................................................................. 39 6.104 Operation of disconnectors and earthing switches – Position of the movable contact system and its indicating and signalling devices ....................................... 40 6.104.1 Securing of position ....................................................................................... 40 6.104.2 Additional requirements for power-operated mechanisms .............................. 40 6.104.3 Indication and signalling of position ............................................................... 40 6.105 Maximum force required for manual (dependent or independent) operation ........... 41 6.105.1 General ......................................................................................................... 41 6.105.2 Operation requiring more than one revolution ................................................ 42 6.105.3 Operation requiring up to one revolution ........................................................ 42 6.106 Dimensional tolerances ......................................................................................... 42 6.107 Earthing switches with short-circuit making current capability ............................... 42 7 Type tests ..................................................................................................................... 42 7.1 General ................................................................................................................. 42 7.1.1 Basics ........................................................................................................... 42 7.1.2 Information for identification of test objects .................................................... 44 7.1.3 Information to be included in type test reports ............................................... 44 7.2 Dielectric tests ...................................................................................................... 44 7.2.1 General ......................................................................................................... 44 7.2.2 Ambient air conditions during tests ................................................................ 44 7.2.3 Wet test procedure ........................................................................................ 44 7.2.4 Arrangement of the equipment ....................................................................... 44 7.2.5 Criteria to pass the test ................................................................................. 45 7.2.6 Application of the test voltage and test conditions .......................................... 45 7.2.7 Tests of disconnectors and earthing switches of Ur ≤ 245 kV ......................... 45 7.2.8 Test of disconnectors and earthing switches of Ur > 245 kV .......................... 45 7.2.9 Artificial pollution tests for outdoor insulators ................................................. 45 7.2.10 Partial discharge tests ................................................................................... 46 SIST EN IEC 62271-102:2018

– 4 – IEC 62271-102:2018 © IEC 2018 7.2.11 Dielectric tests on auxiliary and control circuits .............................................. 46 7.2.12 Voltage test as condition check ..................................................................... 46 7.3 Radio interference voltage (RIV) test .................................................................... 46 7.4 Resistance measurement ...................................................................................... 46 7.5 Continuous current tests ....................................................................................... 46 7.6 Short-time withstand current and peak withstand current tests .............................. 46 7.6.1 General ......................................................................................................... 46 7.6.2 Arrangement of the disconnectors and earthing switches and of the test circuit ............................................................................................................ 46 7.6.3 Test current and duration ............................................................................... 52 7.6.4 Conditions of disconnectors and earthing switches after test ......................... 52 7.7 Verification of the protection ................................................................................. 53 7.8 Tightness tests ..................................................................................................... 53 7.9 Electromagnetic compatibility tests (EMC) ............................................................ 53 7.10 Additional tests on auxiliary and control circuits .................................................... 53 7.11 X-ray radiation test for vacuum interrupters........................................................... 53 7.101 Test to prove the short-circuit making performance of earthing switches ............... 54 7.101.1 General test conditions .................................................................................. 54 7.101.2 Arrangement of the earthing switch for tests .................................................. 54 7.101.3 Test frequency ............................................................................................... 54 7.101.4 Test voltage ................................................................................................... 54 7.101.5 Test short-circuit making current .................................................................... 55 7.101.6 Test circuits ................................................................................................... 55 7.101.7 Test procedures ............................................................................................. 55 7.101.8 Behaviour of earthing switches when making short-circuit currents ................ 56 7.101.9 Condition of earthing switch after short-circuit making tests ........................... 56 7.101.10 Invalid tests ................................................................................................... 57 7.101.11 Type test reports ........................................................................................... 57 7.102 Operating and mechanical endurance tests ........................................................... 58 7.102.1 General test conditions .................................................................................. 58 7.102.2 Contact zone test........................................................................................... 58 7.102.3 Mechanical endurance test ............................................................................ 61 7.102.4 Operation during the application of rated static mechanical terminal loads ............................................................................................................. 63 7.102.5 Extended mechanical endurance tests ........................................................... 64 7.102.6 Testing of mechanical interlocking devices. ................................................... 65 7.103 Operation under severe ice conditions .................................................................. 65 7.103.1 General ......................................................................................................... 65 7.103.2 Test arrangement .......................................................................................... 65 7.103.3 Test procedure .............................................................................................. 66 7.104 Low- and high-temperature tests ........................................................................... 67 7.104.1 General ......................................................................................................... 67 7.104.2 Measurement of ambient air temperature ....................................................... 68 7.104.3 Low-temperature test ..................................................................................... 68 7.104.4 High-temperature test .................................................................................... 70 7.105 Tests to verify the proper functioning of the position-indicating device .................. 70 7.105.1 General ......................................................................................................... 70 7.105.2 Tests on the power kinematic chain and the position-indicating kinematic chain .............................................................................................. 71 7.106 Bus-transfer current switching tests on disconnectors ........................................... 71 SIST EN IEC 62271-102:2018

IEC 62271-102:2018 © IEC 2018 – 5 –

7.106.1 General ......................................................................................................... 71 7.106.2 Making and breaking tests ............................................................................. 71 7.107 Induced current switching tests on earthing switches ............................................ 75 7.107.1 General ......................................................................................................... 75 7.107.2 Arrangement of the earthing switch for tests .................................................. 75 7.107.3 Earthing of test circuit and earthing switch ..................................................... 76 7.107.4 Test frequency ............................................................................................... 76 7.107.5 Test voltage ................................................................................................... 76 7.107.6 Test currents ................................................................................................. 76 7.107.7 Test circuits ................................................................................................... 76 7.108 Bus-charging current switching tests on disconnectors.......................................... 81 7.108.1 General ......................................................................................................... 81 7.108.2 Test duties ..................................................................................................... 82 7.108.3 Arrangement of the disconnector for tests ...................................................... 82 7.108.4 Test frequency ............................................................................................... 82 7.108.5 Test voltages for making and breaking tests .................................................. 83 7.108.6 Test circuits for making and breaking tests .................................................... 84 7.108.7 Performance of making and breaking tests .................................................... 86 7.108.8 Behaviour of the disconnector during making and breaking tests ................... 86 7.108.9 Condition after test ........................................................................................ 87 7.108.10 Type test reports ........................................................................................... 87 7.108.11 Requirements for UTVE measurements ......................................................... 88 8 Routine tests ................................................................................................................. 88 8.1 General ................................................................................................................. 88 8.2 Dielectric test on the main circuit .......................................................................... 88 8.3 Tests on auxiliary and control circuits ................................................................... 89 8.4 Measurement of the resistance of the main circuit ................................................. 89 8.5 Tightness test ....................................................................................................... 89 8.6 Design and visual checks ...................................................................................... 89 8.101 Mechanical operating tests ................................................................................... 89 8.102 Verification of earthing function ............................................................................. 90 9 Guide to the selection of disconnectors and earthing switches (informative) .................. 90 9.1 General ................................................................................................................. 90 9.2 Selection of rated values ....................................................................................... 91 9.2.101 General ......................................................................................................... 91 9.2.102 Selection of rated voltage and rated insulation level ...................................... 91 9.2.103 Selection of rated continuous current ............................................................. 91 9.2.104 Selection of rated contact zone ...................................................................... 91 9.2.105 Selection of rated static mechanical terminal load .......................................... 92 9.2.106 Selection of a bus-transfer current switching capability for disconnectors of Ur > 52 kV ........................................................................... 92 9.2.107 Selection of an induced-current switching capability for earthing switches of Ur > 52 kV ................................................................................... 92 9.2.108 Selection of rated short-time withstand current and of rated

...

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