IEC

IEC 62271-107:2019 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition.

IEC 62271-107:2019 applies to three-pole-operated fused circuit-switchers designed with rated voltages above 1 kV up to and including 52 kV for use on three-phase alternating current systems of either 50 Hz or 60 Hz. This third edition cancels and replaces the second edition published in 2012. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) technical changes introduced by the second edition of IEC 62271-1 are applied, where relevant;
b) rated TRV is removed and TRV is now treated as a test parameter), as in IEC 62271-100;
c) the term "thermal current" is no longer used; the rated continuous current is linked to the installed fuse-links, and values shall be provided by the manufacturer together with the list of the acceptable fuse-links; for tests purpose, the highest rated continuous current listed is referred, where previously the wording was "rated maximum thermal current", for consistency with IEC 62271-105;
d) making and breaking test duties are independent type tests (as some may be omitted if the switching device has been validated as a load-break switch). However, TDIt0 and TDIlow are kept as a sequence as they are linked to the same rated value (It0);
e) differentiation has been introduced between requirements expressed for fulfilling the function expected from a fused circuit-switcher, from requirements only relevant when the function is performed by a stand-alone device. The goal is to avoid duplication or conflicts of requirements with a standard dealing with assemblies, when the function is implemented within such an assembly.

IEC 62271-106:2021 applies to AC contactors and/or contactor-based controllers and motor-starters designed for indoor installation and operation at frequencies up to and including 60 Hz on systems having voltages above 1 kV and up to and including 24 kV. This document also includes additional requirements for outdoor installations where the equipment is housed in an additional protective enclosure.
This second edition cancels and replaces the first edition published in 2011. It constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
document numbered to correspond to IEC 62271-1 2017.

IEC 62271-105:2012 applies to three-pole units for public and industrial distribution systems which are functional assemblies of switches including switch-disconnectors and current-limiting fuses designed so as to be capable of
- breaking, at the rated recovery voltage, any current up to and including the rated short-circuit breaking current;
- making, at the rated voltage, circuits to which the rated short-circuit breaking current applies.
It does not apply to fuse-circuit-breakers, fuse-contactors, combinations for motor-circuits or to combinations incorporating single capacitor bank switches. This second edition cancels and replaces the first edition of IEC 62271-105, published in 2002, and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- implementation of figures at the place where they are cited first;
- renumbering of tables;
- addition of some of the proposals from IEC paper 17A/852/INF;
- addition of missing subclauses of IEC 62271-1;
- implementation of 6.105 "Extension of validity of type tests" and consequently removing of the relevant parts in the different existing clauses;
- change of 7th paragraph of 6.101.4 as there is now a definition of NSDD given in 3.7.4 of IEC 62271-1:2007. Harmonization with IEC 62271-107;
- some referenced clauses in other standards like IEC 60282-1 were changed and therefore changed the editions under 1.2 to the ones referred to;
- addition of a new Annex C defining tolerances.

This publication is to be read in conjunction with IEC 62271-1:2007.

IEC 62271-104:2020 is applicable to three-pole alternating current switches for rated voltages higher than 52 kV, having making and breaking current ratings, for indoor and outdoor installations, and for rated frequencies up to and including 60 Hz.
This third edition replaces and cancels the second edition published in 2015. It constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
- new numbering, following IEC 62271-1:2017.

IEC 62271-103:2021 is applicable to three-phase, alternating current switches and switch-disconnectors for their switching function, having making and breaking current ratings, for indoor and outdoor installations, for rated voltages above 1 kV up to and including 52 kV and for rated frequencies from 162/3 Hz up to and including 60 Hz. This document is also applicable to single-pole switches used on three-phase systems. This second edition cancels and replaces the first edition published in 2011. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
- this document has been aligned with IEC 62271-1:2017 and IEC 62271-102:2018;
- clarifications regarding the behaviour of the switch during breaking tests regarding current interruption and restrikes have been added;
- conditions of the switch after making and breaking tests have been clarified;
- a new informative Annex B intended to provide guidance for the calculation of Ief1 and Ief2 has been added;
- new rules for the combination of 50 Hz and 60 Hz switching tests have been defined and a new table (Table 7) has been added;
- tests with specified TRV have been modified to be in accordance with the practice described in IEC 62271-100;
- the behaviour of the switch during breaking tests has been clarified and boundaries for restrike allowance have been defined;
- explanations for short-circuit making tests have been added;
- vacuum integrity check after mechanical operations has been defined;
- all test voltages for single-phase capacitive testing have been grouped under 7.101.7.3.2 and have been confirmed by simulation and calculation.

IEC 62271-102:2018 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.
This second edition cancels and replaces the first edition published in 2001, Amendment 1:2011 and Amendment 2:2013. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
new numbering according to IEC 17/1025/RQ to harmonize with ISO/IEC Directives, Part 2, and IEEE Std. C37.100.1;
clause numbering has been aligned with IEC 62271-1:2017;
the Scope has been extended to cover all indoor and outdoor installations. Consideration of switching devices having disconnecting and/or earthing switch functionalities, apart from other functions, are also covered by this document;
ratings have been moved from Annexes B, C and E to Clause 5; the order of the subclauses now corresponds to the order of subclauses in Clause 7;
new rating values for bus-transfer current and bus-transfer voltage have been assigned;
new class of mechanical endurance for earthing switches has been added (M1);
subclause "Rated values of electrical endurance for earthing switches" is now called "Classification of earthing switches for short-circuit making capability";
new subclause with ratings for ice-coating has been added;
new subclause with classification of bus-charging switching capability has been added;
new withstand requirements for interlocking devices have been added;
the way to comply with the requirements of the isolating distance of disconnectors has been modified;
design and construction requirements for position-indicating devices have been modified, aligning the requirements for position indication and signalling;
the value of the operating force has been changed;
the test procedures and validation criteria have been revised and modified where necessary;
requirements for applied voltage during single-phase test on non-simultaneous closing earthing switches have been changed;
non-verifiable requirements have been deleted;
a new subclause has been added for testing mechanical interlocking devices;
the high- and low-temperature test is mandatory if the temperature limits for the service conditions of the apparatus (defined by the manufacturer) are above +40 °C or below −5 °C, and a more detailed testing procedure is given;
the testing procedure to verify the proper functioning of the position-indicating device allows a more practicable testing for every technology used;
a new Annex B has been added with title: "Current-switching capability required of disconnectors and earthing switches";
a new Annex C has been added with title: "Tolerances on test quantities for type tests";
a new Annex E has been added with title: "Extension of validity of type tests".

IEC 62271-101:2012+A1:2017 mainly applies to a.c. circuit-breakers within the scope of IEC 62271-100. It provides the general rules for testing a.c. circuit-breakers, for making and breaking capacities over the range of test duties described in 6.102 to 6.111 of IEC 62271-100:2008, by synthetic methods. This second edition cancels and replaces the first edition published in 2007 and its Amendment 1 published in 2011. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the first edition:
- addition of the new rated voltages of 1 100 kV and 1 200 kV;
- revision of Annex F regarding circuit-breakers with opening resistors;
- alignment with the second edition of IEC 62271-100:2008 and its Amendment 1 (2012).
This publication is to be read in conjunction with IEC 62271-100:2008. This consolidated version consists of the second edition (2012) and its amendment 1 (2017). Therefore, no need to order amendment in addition to this publication.
The contents of the corrigendum of January 2018 have been included in this copy.

IEC 62271-100:2008+A1:2012+A1:2017 is applicable to a.c. circuit-breakers designed for indoor or outdoor installation and for operation at frequencies of 50 Hz and 60 Hz on systems having voltages above 1 000 V. It is only applicable to three-pole circuit-breakers for use in three-phase systems and single-pole circuit-breakers for use in single-phase systems. This second edition cancels and replaces the first edition published in 2001 and its amendments 1 (2002) and 2 (2006). It also cancels and replaces IEC 61633 and IEC 62271-308. The main changes with respect to the previous edition are listed below:
- the introduction of harmonised (IEC and IEEE) TRV waveshapes for rated voltages of 100 kV and above (amendment 1 to the first edition);
- the introduction of cable and line systems with their associated TRVs for rated voltages below 100 kV (amendment 2 to the first edition);
- the inclusion of IEC 61633 and IEC 62271-308.
This consolidated version consists of the second edition (2008), its amendment 1 (2012) and its amendment 2 (2017). Therefore, no need to order amendments in addition to this publication.
This publication is to be read in conjunction with IEC 62271-1:2007.
The contents of the corrigendum of December 2012 and corrigendum 1 to amendment 2 of January 2018 have been included in this copy.

IEC 62270:2013 addresses the application, design concepts, and implementation of computer-based control systems for hydroelectric plant automation. It addresses functional capabilities, performance requirements, interface requirements, hardware considerations, and operator training. It includes recommendations for system testing and acceptance. The electrical protective system (generator and step-up transformer) is beyond the scope of this guide. This second edition cancels and replaces the first edition published in 2004. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- update of system architecture aspects, with different process control system configurations;
- update of communications, user and plant interfaces aspects;
- suppression of case studies, because of the quickness of evolution of the technology;
- complete review of the bibliography, making mention of many IEC and IEEE standards as new references and addition of a new informative Annex B on legacy control systems. This publication is published as an IEC/IEEE Dual Logo standard. Key words: Hydroelectric, Automation, Computer-Based Control

IEC 62270:2013 addresses the application, design concepts, and implementation of computer-based control systems for hydroelectric plant automation. It addresses functional capabilities, performance requirements, interface requirements, hardware considerations, and operator training. It includes recommendations for system testing and acceptance. The electrical protective system (generator and step-up transformer) is beyond the scope of this guide. This second edition cancels and replaces the first edition published in 2004. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- update of system architecture aspects, with different process control system configurations;
- update of communications, user and plant interfaces aspects;
- suppression of case studies, because of the quickness of evolution of the technology;
- complete review of the bibliography, making mention of many IEC and IEEE standards as new references and addition of a new informative Annex B on legacy control systems. This publication is published as an IEC/IEEE Dual Logo standard. Key words: Hydroelectric, Automation, Computer-Based Control