SIST EN 62271-100:2002/A2:2007

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

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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: anne.bosma@se.abb.com
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)

Copyright © 2005 International Electrotechnical Commission, IEC. All rights reserved. It is
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

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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

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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.

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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.

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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.
3
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;

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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).
3
3
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 ;
1
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.

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62271-100 Amend 2 Ed. 1/CDV © IEC – 7 –
Replace the existing item b) by the following:
b) circuit-breakers directly connected to transformers without appreciable additional
capacitance between the circuit-breaker and the transformer which provides approximately
50 % or more of the rated short-circuit breaking-current of the circuit-breaker. However the
special case of circuit-breakers of rated voltage less than 100 kV with a connection of low
capacitance to a transformer is covered in Annex M.
Replace the existing item c) by the following:
c) circuit-breakers in substations with series reactors (information is given in 8.103.7 and L.5
for circuit-breakers rated less than 100 kV);

th
Replace the 6 paragraph by the following:
The transient recovery voltage corresponding to the rated short-circuit breaking current when
a terminal fault occurs, is used for testing at short-circuit breaking currents equal to the rated
value. However, for testing with short-circuit breaking currents less than 100 % of the rated
value, other values of transient recovery voltage are specified (see 6.104.5). Further
additional requirements apply to circuit-breakers designed for direct connection to overhead
transmission lines, rated at 15 kV and above and having rated short-circuit breaking currents
exceeding 12,5 kA, which may be operated in short-line fault conditions (see 4.105).

Page 79
Table 1a
Replace Table 1a by the following Tables 24 and 25:
Table 24 – Standard values of transient recovery voltage for circuit-breakers in cable-
systems - Rated voltage less than 100 kV – Representation by two parameters

Rated Type of test First-pole- Ampli- TRV Time Time Voltage Time a
RRRV
voltage to-clear tude peak delay
factor factor value
U k k u t t u’ t’ u /t
r pp af c 3 d c 3
kV p.u. p.u. kV µs µs kV µs kV/µs
Terminal 1,5 1,4 6,2 41 6 2,1 20 0,15
fault
3,6
Out-of- 2,5 1,25 9,2 82 12 3,1 40 0,11
phase
Terminal 1,5 1,4 8,2 44 7 2,7 21 0,19
fault
b
4,76
Out-of- 2,5 1,25 12,1 88 13 4,0 43 0,14
phase
Terminal 1,5 1,4 12,3 51 8 4,1 25 0,24
fault
7,2
Out-of- 2,5 1,25 18,4 102 15 6,1 49 0,18
phase
Terminal 1,5 1,4 14,1 52 8 4,7 25 0,27
fault

b
8,25
Out-of- 2,5 1,25 21,1 105 16 7,0 50 0,20
phase

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62271-100 Amend 2 Ed. 1/CDV © IEC – 8 –
Terminal 1,5 1,4 20,6 61 9 6,9 29 0,34
fault
12
Out-of- 2,5 1,25 30,6 112 17 10,2 54 0,27
phase
Terminal 1,5 1,4 25,7 66 10 8,6 32 0,39
fault
b
15
Out-of- 2,5 1,25 38,3 132 20 12,8 64 0,29
phase
Terminal 1,5 1,4 30 71 11 10,0 34 0,42
fault
17,5
Out-of- 2,5 1,25 44,7 143 21 14,9 69 0,31
phase
Terminal 1,5 1,4 41,2 87 13 13,7 42 0,47
fault
24
Out-of- 2,5 1,25 61,2 174 26 20,4 84 0,35
phase
Terminal 1,5 1,4 44,2 91 14 14,7 44 0,49
fault
b
25,8
Out-of- 2,5 1,25 65,8 182 27 21,9 88 0,36
phase
Terminal 1,5 1,4 61,7 109 16 20,6 53 0,57
fault
36
Out-of- 2,5 1,25 91,9 217 32 30,6 105 0,42
phase
Terminal 1,5 1,4 65,2 109 16 21,7 53 0,60
fault
b
38
Out-of- 2,5 1,25 97,0 217 33 32,3 105 0,45
phase
Terminal 1,5 1,4 82,8 125 19 27,6 60 0,66
fault
b
48,3
Out-of- 2,5 1,25 123 250 38 41,1 121 0,49
phase
Terminal 1,5 1,4 89,2 131 20 29,7 63 0,68
fault
52
Out-of- 2,5 1,25 133 262 39 44,2 127 0,51
phase
Terminal 1,5 1,4 124 165 25 41,4 80 0,75
fault
72,5
Out-of- 2,5 1,25 185 330 50 61,7 159 0,56
phase
a
RRRV = rate of rise of recovery voltage
b
Used in North America

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62271-100 Amend 2 Ed. 1/CDV © IEC – 9 –
c
Table 25 – Standard values of transient recovery voltage for circuit-breakers in line
systems - Rated voltage less than 100 kV – Representation by two parameters

Rated Type of test First-pole- Ampli- TRV Time Time Voltage Time a
RRRV
voltage to-clear tude peak delay
factor factor value
U k k u t t u’ t’ u /t
r pp af c 3 d c 3
kV p.u. p.u. kV µs µs kV µs kV/µs
b Terminal fault 1,5 1,54 28,3 31 2 9,4 12 0,91
15
Short-line 1 1,54 18,9 31 2 6,3 12 0,61
fault
Out-of-phase 2,5 1,25 38,3 62 9 12,8 30 0,62
17,5 Terminal fault 1,5 1,54 33,0 34 2 11,0 13 0,97
Short-line 1 1,54 22,0 34 2 7,3 13 0,65
fault
Out-of-phase 2,5 1,25 45 69 10 14,9 33 0,65
24 Terminal fault 1,5 1,54 45,3 43 2 15,1 16 1,05
Short-line 1 1,54 30,2 43 2 10,1 16 0,70
fault
Out-of-phase 2,5 1,25 61 86 13 20,4 42 0,71
b Terminal fault 1,5 1,54 48,7 45 2 16,2 17 1,08
25,8
Short-line 1 1,54 32,4 45 2 10,8 17 0,72
fault
Out-of-phase 2,5 1,25 66 90 13 21,9 43 0,73
36 Terminal fault 1,5 1,54 67,9 57 3 22,6 22 1,19
Short-line 1 1,54 45,3 57 3 15,1 22 0,79
fault
Out-of-phase 2,5 1,25 92 114 17 30,6 55 0,81
b Terminal fault 1,5 1,54 71,7 59 3 23,9 23 1,21
38
Short-line 1 1,54 47,8 59 3 15,9 23 0,81
fault
Out-of-phase 2,5 1,25 97 118 18 32,3 57 0,82
b Terminal fault 1,5 1,54 91,1 70 4 30,4 27 1,30
48,3
Short-line 1 1,54 60,7 70 4 20,2 27 0,87
fault
Out-of-phase 2,5 1,25 123 140 21 41,1 68 0,88
52 Terminal fault 1,5 1,54 98,1 74 4 32,7 36 1,33
Short-line 1 1,54 65,4 74 4 21,8 28 0,88
fault
Out-of-phase 2,5 1,25 133 148 22 44,2 71 0,90
72,5 Terminal fault 1,5 1,54 137 93 5 45,6 36 1,47
Short-line 1 1,54 91,2 93 5 30,4 36 0,98
fault
Out-of-phase 2,5 1,25 185 186 28 61,7 90 0,99

a
RRRV = rate of rise of recovery voltage
b
Used in North America
c
For short-line faults: transient recovery voltage and time quantities are those of the supply circuit.

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62271-100 Amend 2 Ed. 1/CDV © IEC – 10 –
Page 85
4.102.3 Standard values of TRV related to the rated short-circuit breaking current
Replace the heading of Table 2 by the following:
Table 2 – Standard multipliers for transient recovery voltage values for second and
third clearing poles for rated voltages 1 kV and above.

Page 85
4.102.3 Standard values of TRV related to the rated short-circuit breaking current
Replace NOTE 1 by the following:
NOTE 1 Values for rated voltages less than 100 kV are under consideration.

Page 89
4.105 Characteristics for short-line faults
Replace the text of subclause 4.105 by the following:
Characteristics for short-line faults are required for circuit-breakers designed for direct
connection to transmission lines (without intervening cable connections) and having a rated
voltage of 15 kV and above and a rated short-circuit breaking current exceeding 12,5 kA.
These characteristics relate to the breaking of a single-phase earth fault in a system with
earthed neutral, where the first-pole-to-clear factor is equal to 1,0.
NOTE In this standard, a single-phase test at phase-to-earth voltage covers all types of short-line fault (see Annex
L.3).
The short-line fault circuit is composed of a supply circuit on the source side of the circuit-
breaker and a short-line on its load side (see figure 15), with the following characteristics:
a) supply circuit characteristics:
- voltage equal to the phase-to-earth voltage U /√3 corresponding to the rated voltage U
r r
of the circuit-breaker;
- short-circuit current, in case of terminal fault, equal to the rated short-circuit breaking
current of the circuit-breaker;
- prospective transient recovery voltage, in case of short-line fault, given by the
standard values in
Table 25, for circuit-breakers in line systems with rated voltages less than 100 kV ;
Table 1b, for circuit-breakers with rated voltages from 100 kV up to and including
170kV;
Table 1c, for circuit-breakers with rated voltages 245 kV and above.
- ITRV characteristics for circuit-breakers of 100 kV and above derived from Table 3.
b) line characteristics:
- standard values of the RRRV factor, based on a surge impedance Z of 450 Ω, the peak
factor k and the line side time delay t are given in Table 4. For determination of the
dL
line side time delay and the rate-of-rise of the line side voltage, see figure 16;

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62271-100 Amend 2 Ed. 1/CDV © IEC – 11 –
- the method for calculation of transient recovery voltages from the characteristics is
given in Annex A.
Table 4 - Standard values of line characteristics for short-line faults
Rated Number of Surge Peak RRRV factor Time
voltage conductors impedance factor delay
per phase 50 Hz   I   60 Hz
U Z k s* t

r dL
Ω (kV/µs)/kA
kV µs
15 ≤ U ≤ 38 1 450 1.6 0,200 0,240 0,1
r
1 to 4 450 1,6 0,200 0,240 0,2
48,3 ≤ U ≤ 170
r
U ≥ 245 1 to 4 450 1,6 0,200 0,240 0,5
r
NOTE These values cover the short-line faults dealt with in this standard. For very short lines
(t < 5t ) not all requirements as given in the Table can be met. The procedures for approaching very
L dL
short lines will be given in the application guide to this standard (currently prepared by CIGRE WG A3-
11).
* For the RRRV factor s, see Annex A.

Page 91
4.106 Rated out-of-phase making and breaking current
Replace item b) by the following:
b) the transient recovery voltage shall be in accordance with:
- Table 24, for circuit-breakers in cable systems with rated voltages less than 100 kV;
- Table 25, for circuit-breakers in line systems with rated voltages less than 100 kV;
- Table 1b, for circuit-breakers with rated voltages from 100 kV up to and including
170kV;
- Table 1c, for circuit-breakers with rated voltages 245 kV and above.


Page 113

Table 6 - Nameplate information
Replace the row on classification with the following:
Classification  y If different from E1, C1, M1,
CS for rated voltages less
than 100 kV.
If different from E1, C1, M1
for rated voltages 100 kV
and above

Page 205

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62271-100 Amend 2 Ed. 1/CDV © IEC – 12 –
6.104.5.1 General
th
Replace the 5 paragraph and item a) by the following:
TRV parameters are defined as follows as a function of the rated voltage (U ), the first-pole-
r
to-clear factor (k ) and the amplitude factor (k ). The actual values of k and k are stated
pp af pp af
in tables 24, 25, 1b, 1c, 26, 27, 14a and 14b. The first-pole-to-clear factor kpp is 1,3 as listed
in table 14a for all circuit-breakers rated 100 kV and above where systems are usually solidly
earthed. For isolated earthed or resonant earthed systems from 100 kV to 170 kV, kpp = 1,5
as listed in table 14b.

a) For rated voltages less than 100 kV
A representation by two parameters of the prospective TRV is used for all test-duties.
- In Table 26, for circuit-breakers in cable systems
TRV peak value u = k × k (2/3)× U where k is equal to 1,4 for test-duty T100, 1,5
c pp af r af
for test-duty T60, 1,6 for test duty T30 and 1,7 for test duty T10, 1,25 for out-of-phase
breaking.
Time t for test-duty T100 is taken from Table 24. Time t for test-duties T60, T30 and T10
3 3
is obtained by multiplying the time t for test-duty T100 by 0,44 (for T60), 0,22 (for T30)
3
and 0,22 (for T10).
- In Table 27, for circuit-breakers in line systems
TRV peak value u = k × k (2/3)× U where k is equal to 1,54 for test-duty T100
c pp af r af
and the supply side circuit for short-line fault, 1,65 for test-duty T60, 1,74 for test duty T30
and 1,8 for test duty T10, 1,25 for out-of-phase breaking.
Time t for test-duty T100 is taken from Table 25 Time t for test-duties T60, T30 and T10
.
3 3
is obtained by multiplying the time t for test-duty T100 by 0,67 (for T60), 0,40 (for T30)
3
and 0,40 (for T10).
- Time delay t for test-duty T100 is 0,15 × t for cable systems, 0,05 × t for line systems,
d 3 3
0,05 × t for the supply side circuit for short-line fault.
3
- Time delay t is 0,15 × t for test-duties T60, T30 and T10 and for out-of-phase breaking.
d 3
- Voltage u'=u /3.
c
- Time t' is derived from u', t and t according to figure 11, t’ = t + t /3.
3 d d 3

Page 211
6.104.5.2 Test duties T100s and T100a
Replace the first 5 paragraphs by the following:
For rated voltages less than 100 kV, the specified standard values are given in
- Table 26, for circuit-breakers in cable systems,
- Table 27 for circuit-breakers in line systems;
For rated voltages of 100 kV and above, the specified standard values are given in Tables
14a and 14b.
The specific reference lines, delay lines and ITRV are given by the standard values in Tables
24, 25, 1b, 1c, 2 and 3.

---------------------- Page: 13 ----------------------

62271-100 Amend 2 Ed. 1/CDV © IEC – 13 –
With reference to ITRV, if a test is made with a TRV following the straight reference line
specified in requirement b) of 6.104.5.1 and shown in Figure 12 b, it is assumed that the
effect on the circuit-breaker is similar to that of any ITRV defined in requirement b) of
6.104.5.1 and Figure 12 b.
Owing to limitations of the testing station, it may not be feasible to comply with the
requirement of item b) of 6.104.5.1 with respect to the time delay t as specified in tables 1b
d
or 1c. Where short-line fault duties are also to be performed, any such deficiency of the TRV
of the supply circuit shall be compensated by an increase of the voltage excursion to the first
peak of the line-side voltage (see 6.109.3). The time delay of the supply circuit shall be as
small as possible, but shall in any case not exceed the values given in brackets in Table 27 or
Table 14a or Table 14b.

Page 211
6.104.5.3 Test-duty T60
Replace the text of subclause 6.104.5.3 by the following:
For rated voltages less than 100 kV, the specified standard values are given in
- Table 26, for circuit-breakers in cable systems,
- Table 27 for circuit-breakers in line systems;
For rated voltages of 100 kV and above, the specified standard values are given in Table 14a
and Table 14b.

Page 211
6.104.5.4 Test-duty T30
Replace the text of subclause 6.104.5.4 by the following:
a) For rated voltages less than 100 kV, the specified standard values are given in
- Table 26, for circuit-breakers in cable systems,
- Table 27 for circuit-breakers in line systems;
In direct or synthetic testing, it may be difficult to meet the small values of time t . The
3
shortest time that can be met should be used but not less than the values specified. The
values used shall be stated in the test report.
b) For rated voltages of 100 kV and above, the specified standard values are given in
Tables 14a and 14b.
NOTE The contribution of transformers to the short-circuit current is relatively larger at smaller values of short-
circuit current as in T30 and T10 conditions. However, most systems have solidly earthed neutrals at ratings of
100 kV and above. With the system and transformer neutrals solidly earthed, the first-pole-to-clear factor of 1,3 is
applicable for all test duties. In some systems for rated voltages of 100 kV up to and including 170 kV,
transformers with non-solidly earthed neutrals are in service, even though the rest of the system may have solidly
earthed neutrals. Such systems are considered special cases and are covered in Tables 1c and 14b where the
TRVs specified for all test duties are based o
...