EN 62271-100:2001/A2:2006

High-voltage switchgear and controlgear - Part 100: High-voltage alternating-current circuit-breakers

Corrigendum to A2 issued November 2006 * Superseded by EN 62271-100:2009

Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil 100: Hochspannungs-Wechselstrom-Leistungsschalter

Appareillage à haute tension - Partie 100: Disjoncteurs à courant alternatif à haute tension

Visokonapetostne stikalne in krmilne naprave - 100. del: Izmenični odklopniki – Revizija TRV in posebni preskusi za odklopnike za napetosti nad 1 kV in do 100 kV (IEC 62271-100:2001/A2:2006)

General Information

• Status: Withdrawn
• Publication Date: 19-Oct-2006
• Withdrawal Date: 30-Sep-2009
• ICS: 29.130.10 - High voltage switchgear and controlgear
• Technical Committee: CLC/TC 17AC - High-voltage switchgear and controlgear
• Drafting Committee: IEC/SC 17A - IEC_SC_17A
• Parallel Committee: IEC/SC 17A - IEC_SC_17A
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 01-Mar-2012
• Completion Date: 01-Mar-2012
• Ref Project: SIST EN 62271-100:2002/A2:2007 - High-voltage switchgear and controlgear -- Part 100: High-voltage alternating-current circuit-breakers

Relations

• Replaced By: EN 62271-100:2009 - High-voltage switchgear and controlgear - Part 100: Alternating-current circuit-breakers
• Effective Date: 29-Jan-2023
• Amends: EN 62271-100:2001 - High-voltage switchgear and controlgear - Part 100: High-voltage alternating-current circuit-breakers
• Effective Date: 29-Jan-2023

Standards Content (Sample)

SLOVENSKI SIST EN 62271-
100:2002/oprA2:2005
PREDSTANDARD
april 2005
Visokonapetostne stikalne in krmilne naprave – 100. del: Izmenični odklopniki
– Revizija TRV in posebni preskusi za odklopnike za napetosti nad 1 kV in do
100 kV
High-voltage switchgear and controlgear – Part 100: Alternating current circuit-
breakers – Revision of TRV and special tests for circuit-breakers with rated voltage
above 1 kV and less than 100 kV
ICS 29.130.10 Referenčna številka
SIST EN 62271-
100:2002/oprA2:2005(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

17A/719A/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJET DE COMITÉ POUR VOTE (CDV)

Project number IEC 62271-100, A2, Ed.1 *
Numéro de projet
IEC/TC or SC: Date of circulation Closing date for voting (Voting
SC 17A
Date de diffusion mandatory for P-members)

CEI/CE ou SC:
Date de clôture du vote (Vote
2005-02-11
obligatoire pour les membres (P))
(2004-12-17)
2005-05-20 **
Titre du CE/SC: APPAREILLAGE A HAUTE TC/SC Title: HIGH-VOLTAGE SWITCHGEAR AND
TENSION CONTROLGEAR
Secretary: Mr. A. Bosma (Sweden)
Secrétaire: E-mail: [e-mail]
Also of interest to the following committees Supersedes documents
Intéresse également les comités suivants Remplace les documents
SC 17C, SC 32A 17A/686/CD – 17A/701/CC and item 6.1 of
17A/715/RM
Functions concerned
Fonctions concernées
Safety EMC Environment Quality assurance
Sécurité
CEM Environnement Assurance qualité
CE DOCUMENT EST TOUJOURS À L'ÉTUDE ET SUSCEPTIBLE DE THIS DOCUMENT IS STILL UNDER STUDY AND SUBJECT TO CHANGE. IT
MODIFICATION. IL NE PEUT SERVIR DE RÉFÉRENCE. SHOULD NOT BE USED FOR REFERENCE PURPOSES.
LES RÉCIPIENDAIRES DU PRÉSENT DOCUMENT SONT INVITÉS À RECIPIENTS OF THIS DOCUMENT ARE INVITED TO SUBMIT, WITH THEIR
PRÉSENTER, AVEC LEURS OBSERVATIONS, LA NOTIFICATION DES COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF
DROITS DE PROPRIÉTÉ DONT ILS AURAIENT ÉVENTUELLEMENT WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING
CONNAISSANCE ET À FOURNIR UNE DOCUMENTATION EXPLICATIVE. DOCUMENTATION.

Titre : Amendement 2 à la CEI 62271-100, Ed.1: Title : Amendment 2 to IEC 62271-100, Ed.1:
Révision des Tensions Transitoires de Revision of TRV and special tests for circuit-
Rétablissement et essais spéciaux pour breakers with rated voltage above 1 kV and less
disjoncteurs de tension assignée supérieure à 1 than 100 kV
kV et inférieure à 100 kV
Note d'introduction Introductory note
* Anciennement CEI 62271-100, A2, f1, Ed.1 * Former IEC 62271-100, A2, f1, Ed.1
** La date de clôture du vote reste inchangée. ** The closing date remains unchanged.

IEC CO note: The NC comments and observations in document 17A/701/CC were discussed, as
mentioned above, at the SC 17A plenary meeting held in Seoul. Further information on these discussions
and subsequent modifications to the observations can be found in document 17A/715/RM, item 6.1.

This document cancels and replaces document 17A/719/CDV. This document is also of
interest to SC 17C and SC 32A.

ATTENTION ATTENTION
CDV soumis en parallèle au vote (CEI) Parallel IEC CDV/CENELEC Enquiry
et à l’enquête (CENELEC)
permitted to download this electronic file, to make a copy and to print out the content for the sole
purpose of preparing National Committee positions. You may not copy or "mirror" the file or
printed version of the document, or any part of it, for any other purpose without permission in
writing from IEC.
FORM CDV (IEC)
2002-08-09
62271-100 Amend 2 Ed. 1/CDV © IEC – 2 –
Revision of TRV and special tests for circuit-breakers with rated voltage
above 1 kV and less than 100 kV

Introductory note (not part of the amendment)
Following the decision taken at the SC 17A meeting in Beijing (CN) in October, 2002, IEC SC
17A/WG 35 has prepared a proposal for the revision of TRVs for circuit-breakers rated above
1 kV and less than 100 kV. In this CDV the decisions taken during the SC17A meetings in
Montreal (CA) in October, 2003, and Seoul (KR) in October, 2004, are implemented.
This proposal uses the input coming from former Working groups of CIGRE Study Committee
A3 (Switching Equipment) that have studied the necessity to adapt the TRV requirements for
circuit-breakers rated less than 100 kV. In 1983, a CIGRE SC A3 Task Force reported on
Transient Recovery Voltages in Medium Voltage Networks. The results of the study have been
published in Electra 88. Another working group, WG 13.05, studied the TRVs generated by
clearing transformer fed faults and transformer secondary faults. The results have been
presented in Electra 102 (1985). In 1992, together with CIRED, CIGRE SCA3 created the
Working group CC-03 to investigate again the definition of TRVs for medium voltage switching
devices. The outcome of these investigations has been published in CIGRE Technical
Brochure 134 (1998) and is in line with earlier studies.
The main modifications introduced in this amendment are summarized below.
a) In order to cover all types of networks (distribution, industrial and sub-transmission) in the
range of rated voltages higher than 1 kV and less than 100 kV, and for standardization
purposes, two types of systems are defined:
- Cable systems
Cable-systems have a TRV during breaking of terminal fault at 100% of short-circuit breaking
current that does not exceed the two-parameter envelope derived from Table 24 of this
standard.
Note 1: This definition is restricted to systems of rated voltages higher than 1 kV and less than 100 kV.
Note 2: Circuit-breakers of indoor substations with cable connection are in cable-systems.
Note 3: A circuit-breaker in an outdoor substation with cable-connection to overhead-lines is considered to be in a
cable-system if the total length of cable connected on the supply side of the circuit-breaker is at least 100 m.
Note 4: The capacitance of cable-systems on the supply side of circuit-breakers is provided by cables and/or
capacitors and/or insulated bus.

- Line systems
Line systems have a TRV during breaking of terminal fault at 100% of short-circuit breaking
current defined by the two-parameter envelope derived from Table 25 of this standard.
Note 1: This definition is restricted to systems of rated voltages higher than 1 kV and less than 100 kV.
Note 2: In line-systems, no cable is connected on the supply side of the circuit-breaker, with the possible exception
of a short length of cable between the circuit-breaker and the line(s) or the supply transformer.
Note 3: Systems with transmission lines directly connected to a busbar (without intervening cable connections) are
typical examples of line-systems.
b) A particular test duty T30 is specified for the special case of circuit-breakers intended to
be connected to a transformer with a connection of small capacitance (cable length less
than 20 m), in order to verify their capability to interrupt transformer-limited faults. This is
covered in a new normative Annex M.
In the general case where the capacitance of the connection is high enough, the normal
test duty T30 demonstrates the capability to interrupt transformer-limited faults.
c) Short-line fault is a mandatory duty for circuit-breakers with rated voltages 15 kV and
above and directly connected to overhead lines. As specified for circuit-breakers rated 52
kV and above, the rated short-circuit current must be higher than 12,5 kA (i.e. I ≥ 16 kA).
sc
62271-100 Amend 2 Ed. 1/CDV © IEC – 3 –
d) The special case of circuit-breakers installed immediately in series with a reactor is
covered in a new subclause 8.103.7.
The main content of this introductory note and additional technical explanations on the
introduced changes in TRVs for circuit-breakers rated less than 100 kV are given in a new
informative Annex L. This Annex should be transferred later to the application guide to IEC
62271-100.
It is to be noted that a corresponding revision of TRVs is undertaken by ANSI/IEEE, and that
both revisions would lead to fully harmonized TRVs for circuit-breakers rated higher than 1 kV
and less than 100 kV.
In addition, WG35 proposes to modify Figure 13 (Three-phase short-circuit representation)
and figure 14 (alternative representation of Figure 13), to indicate that the source neutral
impedance is not necessarily an inductance, but could be also a capacitance or a combination
of impedances.
62271-100 Amend 2 Ed. 1/CDV © IEC – 4 –
FOREWORD
This amendment has been prepared by subcommittee 17A: High-voltage switchgear and
controlgear, of IEC Technical Committee 17: Switchgear and controlgear.
The text of this amendment is based on the following documents:
FDIS Report on voting
17A/XX/FDIS 17A/XX/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above Table.
The committee has decided that the contents of the base publication and its amendments will
remain unchanged until (to be completed later). At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
_____________
Page 7
Contents
Add new annexes L and M to the list of contents
Annex L (informative) Explanatory notes on the revision of TRVs for circuit-breakers of rated
voltages higher than 1 kV and less than 100 kV.
Annex M (normative) Requirements for breaking of transformer-limited faults by circuit-
breakers rated higher than 1 kV and less than 100 kV.

Page 33
Add the following definitions after 3.4.118:
3.4.119
cable system
cable-systems have a TRV during breaking of terminal fault at 100% of short-circuit breaking
current that does not exceed the two-parameter envelope derived from Table 24 of this
standard.
NOTE 1 This definition is restricted to systems of rated voltages higher than 1 kV and less than 100 kV.
NOTE 2 Circuit-breakers of indoor substations with cable connection are in cable-systems.
NOTE 3 A circuit-breaker in an outdoor substation with cable-connection to overhead-lines is considered to be in a
cable-system if the total length of cable connected on the supply side of the circuit-breaker is at least 100 m.
NOTE The capacitance of cable-systems on the supply side of circuit-breakers is provided by cables and/or
capacitors and/or insulated bus.
3.4.120
line system
line systems have a TRV during breaking of terminal fault at 100% of short-circuit breaking
current defined by the two-parameter envelope derived from Table 25 of this standard.

62271-100 Amend 2 Ed. 1/CDV © IEC – 5 –
NOTE 1 This definition is restricted to systems of rated voltages higher than 1 kV and less than 100 kV.
NOTE 2 In line-systems, no cable is connected on the supply side of the circuit-breaker, with the possible
exception of a short length of cable between the circuit-breaker and the line(s) or the supply transformer.
NOTE 3 Systems with transmission lines directly connected to a busbar (without intervening cable connections)
are typical examples of line-systems.
3.4.121
circuit-breaker class CS
circuit-breaker intended to be used in a cable system.
3.4.122
circuit-breaker class LS
circuit-breaker intended to be used in a line-system .
Page 57
3.8 Index of definitions
Add the following definitions after circuit breaker class M2
Cable system     3.4.119
Line system     3.4.120
Circuit-breaker class CS    3.4.121
Circuit-breaker class LS    3.4.122

Page 65
4. Rating
Replace the existing item p) by the following:
p) characteristics for short-line faults related to the rated short-circuit breaking current, for
circuit-breakers designed for direct connection to overhead transmission lines and rated at
15 kV and above and at more than 12,5 kA rated short-circuit breaking current;

Page 75
4.102.2 Representation of TRV
Replace the existing items b) and c) by the following:
b) Two-parameter reference line (see figure 11):
u = reference voltage (TRV peak value), in kilovolts;
c
t = time in microseconds.
TRV parameters are defined as a function of the rated voltage (U ), the first-pole-to-clear
r
factor (k ) and the amplitude factor (k ) as follows:
pp af
u = k × k (2/3)× U
c pp af r
where k is equal to
af
1,4 for terminal fault in the case of cable systems;

62271-100 Amend 2 Ed. 1/CDV © IEC – 6 –
1,54 for terminal fault and short-line fault, in the case of line systems;
1,25 for out-of-phase.
t for the supply side circuit for short-line fault = t (terminal fault).
t for out-of-phase = 2 × t (terminal fault).
3 3
c) Delay line of TRV (see figures 10 and 11):
t = time delay, microseconds;
d
u’ = reference voltage, in kilovolts;
t’ = time to reach u’, in microseconds
The delay line starts on the time axis at the rated time delay and runs parallel to the first
section of the reference line of rated TRV and terminates at the voltage u’ (time co-
ordinate t’).
For rated voltages lower than 100 kV:
t = 0,15 × t , for terminal fault and out-of-phase in the case of cable systems;
d 3
t = 0,05 × t , for terminal fault and short-line-fault in the case of line systems;
d 3
t = 0,15 × t , for out-of-phase in the case of line systems;
d 3
u’ = u /3 ;
c
t’ is derived from t and t according to figure 11, t’ = t + t /3.

d 3 d 3
For rated voltages equal or higher than 100 kV:
t = 0,21 × t or 2 µs for terminal fault and short-line fault;
d 1
t = 0,1 × t for out-of-phase;
d 1
u’ = u /2 ;
t’ is derived from u’, u /t (RRRV) and t according to figure 10, t’ = t + u’/RRRV.
1 1 d d
Page 77
4.102.3 Standard values of TRV related to the rated short-circuit breaking current
Replace the first paragraph by the following:
Standard values of TRV for three-pole circuit-breakers of rated voltages less than 100 kV
make use of two parameters. Values are given in:
- Table 24, for cable systems;
- Table 25, for line systems;
th
Replace the existing 4 paragraph by the following:
The values given in the tables are prospective values. They apply to circuit-breakers for
general transmission and distribution in three-phase systems having service frequencies of
50 Hz or 60 Hz and consisting of transformers, overhead lines and cables.

62271-100 Amend 2 Ed. 1/CDV © IEC – 7 –
Replace the existing item b) by the following:
b) circuit-breake
...

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High-voltage switchgear and controlgear -- Part 100: High-voltage alternating-current
circuit-breakers (IEC 62271-100:2001/A2:2006)
Hochspannungs-Schaltgeräte und -Schaltanlagen -- Teil 100: Hochspannungs-
Wechselstrom-Leistungsschalter (IEC 62271-100:2001/A2:2006)
Appareillage a haute tension -- Partie 100: Disjoncteurs a courant alternatif a haute
tension (IEC 62271-100:2001/A2:2006)
Ta slovenski standard je istoveten z: EN 62271-100:2001/A2:2006
ICS:
29.130.10 Visokonapetostne stikalne in High voltage switchgear and
krmilne naprave controlgear
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 62271-100/A2
NORME EUROPÉENNE
October 2006
EUROPÄISCHE NORM
ICS 29.130.10 Incorporates Corrigendum November 2006

English version
High-voltage switchgear and controlgear
Part 100: High-voltage alternating-current circuit-breakers
(IEC 62271-100:2001/A2:2006)
Appareillage à haute tension  Hochspannungs-Schaltgeräte und
Partie 100: Disjoncteurs à courant -Schaltanlagen
alternatif à haute tension Teil 100: Hochspannungs-Wechselstrom-
(CEI 62271-100:2001/A2:2006) Leistungsschalter
(IEC 62271-100:2001/A2:2006)
This amendment A2 modifies the European Standard EN 62271-100:2001; it was approved by CENELEC on
2006-10-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this amendment 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 Central Secretariat or to any CENELEC member.

This amendment 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
Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62271-100:2001/A2:2006 E

Foreword
The text of document 17A/754/FDIS, future amendment 2 to IEC 62271-100:2001, prepared by SC 17A,
High-voltage switchgear and controlgear, of IEC TC 17, Switchgear and controlgear, was submitted to the
IEC-CENELEC parallel vote and was approved by CENELEC as amendment A2 to EN 62271-100:2001
on 2006-10-01.
The following dates were fixed:
– latest date by which the amendment has to be
implemented at national level by publication of
(dop) 2007-07-01
an identical national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2009-10-01
with the amendment have to be withdrawn
Annex ZB has been added by CENELEC.
The contents of the corrigendum of November 2006 have been included in this copy.
__________
Endorsement notice
The text of amendment 2:2006 to the International Standard IEC 62271-100:2001 was approved by
CENELEC as an amendment to the European Standard without any modification.
__________
- 3 - EN 62271-100:2001/A2:2006
Annex ZB
(informative)
A-deviations
A-deviation: National deviation due to regulations, the alteration of which is for the time being outside the
competence of the CENELEC national member.
This European Standard does not fall under any Directive of the EC.
In the relevant CENELEC countries these A-deviations are valid instead of the provisions of the European
Standard until they have been removed.
Clause Deviation
(*)
1.1 Italy (I.S.P.E.S.L. Rules, 95 revision: VSR.8.B.1; VSR.8.B.2; M.15.D.2 to .4.)
For high-voltage alternating current circuit-breakers containing gas-filled compartments,
the design pressure is limited to a maximum of 0,5 bar (gauge) and the volume is limited
to a maximum of 2 m . Gas filled compartments having a design pressure exceeding
0,5 bar (gauge) or a volume exceeding 2 m shall be designed according to Italian
pressure vessel code for electrical switchgear (DM 1 December 1980 and DM
10 September 1981 published on Gazzetta Ufficiale n° 285 dated 16.10.1981). This
requirement is not applicable for gas filled compartments having a design pressure
exceeding 0,5 bar (gauge) but a volume not exceeding 25 dm .
Italian laws apply to gas pressurized enclosures made of both insulating and metallic
materials with a capacity of 25 litres or above, a design pressure higher than 0,05 kg/cm
and a temperature range: -25 °C/+100 °C (only for insulating materials).
Moreover the manufacturer of any electrical equipment which comprehends gas
pressurized enclosures must submit the design of the pressurized enclosures itself to a
proper legal Authority indicating the stresses and the loads which have any influence on
the design itself. For each of the stresses the manufacturer must indicate the design
values and the relevant computations.
Only the use of porcelain type A or S (Aluminous or Siliceous) is permitted.
(*)
I.S.P.E.S.L.: Istituto Superiore per la Prevenzione e la Sicurezza del Lavoro.
__________
INTERNATIONAL IEC
STANDARD 62271-100
AMENDMENT 2
2006-07
Amendment 2
High-voltage switchgear and controlgear –
Part 100:
High-voltage alternating-current circuit-breakers

This English-language version is derived from the original
bilingual publication by leaving out all French-language
pages. Missing page numbers correspond to the French-
language pages.
© IEC 2006 Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical,
including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
PRICE CODE
V
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International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

62271-100 Amend. 2  IEC:2006 – 3 –
FOREWORD
This amendment has been prepared by subcommittee 17A: High-voltage switchgear and
controlgear, of IEC Technical Committee 17: Switchgear and controlgear.
The text of this amendment is based on the following documents:
FDIS Report on voting
17A/754/FDIS 17A/761/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the maintenance result date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________
Page 7
CONTENTS
Add, to the list, the following new Annexes L and M:
Annex L (informative) Explanatory notes on the revision of TRVs for circuit-breakers of rated
voltages higher than 1 kV and less than 100 kV
Annex M (normative) Requirements for breaking of transformer-limited faults by circuit-
breakers with rated voltage higher than 1 kV and less than 100 kV

Page 25
3 Definitions
Add, on page 31, the following definitions after 3.1.127:
3.1.128
effectively earthed neutral system
system earthed through a sufficiently low impedance such that for all system conditions the
ratio of the zero-sequence reactance to the positive-sequence reactance (X /X ) is positive
0 1
and less than 3, and the ratio of the zero-sequence resistance to the positive-sequence
reactance (R /X ) is positive and less than 1. Normally such systems are solidly earthed
0 1
(neutral) systems or low impedance earthed (neutral) systems
NOTE For the correct assessment of the earthing conditions not only the physical earthing conditions around the
relevant location but the total system is to be considered.

62271-100 Amend. 2  IEC:2006 – 5 –
3.1.129
non-effectively earthed neutral system
system other than effectively earthed neutral system, not meeting the conditions given in
3.1.128. Normally such systems are isolated neutral systems, high impedance earthed
(neutral) systems or resonant earthed (neutral) systems
NOTE For the correct assessment of the earthing conditions not only the physical earthing conditions around the
relevant location but the total system is to be considered.

Add, on page 33, the following definitions after 3.4.118:
3.4.119
cable system
system in which the TRV during breaking of terminal fault at 100 % of short-circuit breaking
current does not exceed the two-parameter envelope derived from Table 24 of this standard
NOTE 1 This definition is restricted to systems of rated voltages higher than 1 kV and less than 100 kV.
NOTE 2 Circuit-breakers of indoor substations with cable connection are generally in cable-systems.
NOTE 3 A circuit-breaker in an outdoor substation is considered to be in a cable-system if the total length of
cable (or equivalent length when capacitors are also present) connected on the supply side of the circuit-breaker is
at least 100 m. However if in an actual case with an equivalent length of cable shorter than 100 m a calculation can
show that the actual TRV is covered by the envelope defined from Table 24, then this system is considered as a
cable system.
NOTE 4 The capacitance of cable-systems on the supply side of circuit-breakers is provided by cables and/or
capacitors and/or insulated bus.
3.4.120
line system
system in which the TRV during breaking of terminal fault at 100 % of short-circuit breaking
current is covered by the two-parameter envelope derived from Table 25 of this standard and
exceeds the two-parameter envelope derived from Table 24 of this standard
NOTE 1 This definition is restricted to systems of rated voltages equal to or higher than 15 kV and less than
100 kV.
NOTE 2 In line-systems, no cable is connected on the supply side of the circuit-breaker, with the possible
exception of a total length of cable less than 100 m between the circuit-breaker and the supply transformer(s).
NOTE 3 Systems with overhead lines directly connected to a busbar (without intervening cable connections) are
typical examples of line-systems.
3.4.121
circuit-breaker class S1
circuit-breaker intended to be used in a cable system
3.4.122
circuit-breaker class S2
circuit-breaker intended to be used in a line-system, or in a cable-system with direct
connection (without cable) to overhead lines

Page 55
3.8 Index of definitions
Add the following definitions in the list of index:

62271-100 Amend. 2  IEC:2006 – 7 –
C
Cable system. 3.4.119
Circuit-breaker class S1. 3.4.121
Circuit-breaker class S2. 3.4.122
E
Effectively earthed neutral system . 3.1.128
L
Line system . 3.4.120
N
Non-effectively earthed neutral system . 3.1.129

Page 63
4 Rating
Replace, on page 65, the existing item p) by the following:
p) characteristics for short-line faults related to the rated short-circuit breaking current, for
circuit-breakers designed for direct connection to overhead lines, irrespective of the type
of network on the source side, and rated at 15 kV and above and at more than 12,5 kA
rated short-circuit breaking current;

Page 73
4.102.2 Representation of TRV
Replace, on page 75, the existing items b) and c) by the following:
b) Two-parameter reference line (see Figure 11):
u = reference voltage (TRV peak value), in kV;
c
t = time in µs.
TRV parameters are defined as a function of the rated voltage (U ), the first-pole-to-clear
r
factor (k ) and the amplitude factor (k ) as follows:
pp af
u = k × k (2/3 ) × U
c pp af r
where k is equal to
af
1,4 for terminal fault in the case of cable systems;
1,54 for terminal fault and short-line fault, in the case of line systems;
1,25 for out-of-phase;
t for the supply side circuit for short-line fault = t (terminal fault).
t for out-of-phase = 2 × t (terminal fault).
3 3
62271-100 Amend. 2  IEC:2006 – 9 –
c) Delay line of TRV (see Figures 10 and 11):
t = time delay, in microseconds;
d
u’ = reference voltage, in kilovolts;
t’ = time to reach u’, in microseconds
The delay line starts on the time axis at the rated time delay and runs parallel to the first
section of the reference line of rated TRV and terminates at the voltage u’ (time co-
ordinate t’).
For rated voltages lower than 100 kV:
t = 0,15 × t , for terminal fault and out-of-phase in the case of cable systems;
d 3
t = 0,05 × t , for terminal fault and short-line-fault in the case of line systems;
d 3
t = 0,15 × t , for out-of-phase in the case of line systems;
d 3
u’ = u /3 ;
c
t’ is derived from t and t according to Figure 11, t’ = t + t /3.

d 3 d 3
For rated voltages equal or
...