High-voltage switchgear and controlgear - Part 112: Alternating current high-speed earthing switches for secondary arc extinction on transmission lines

IEC 62271-112:2021 is available as IEC 62271-112:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 62271-112:2021 applies to AC high-speed earthing switches (hereinafter termed HSES) designed for indoor and outdoor installation and for operation at service frequencies of 50 Hz and 60 Hz on systems having rated voltages of 550 kV and above. HSESs described in this document are intended to extinguish the secondary arc remaining after clearing faults on transmission lines by the circuit-breakers. For more detailed information on HSESs, refer to Annex A. This second edition cancels and replaces the first edition published in 2013. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: The document has been updated to the second edition of IEC 62271-1:2017.

Appareillage à haute tension - Partie 112: Sectionneurs de terre rapides à courant alternatif pour l'extinction de l'arc secondaire sur les lignes de transport

IEC 62271-112:2021 est disponible sous forme de IEC 62271-112:2021 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L’IEC 62271-112:2021 s’applique aux sectionneurs de terre rapides à courant alternatif (nommés ci-après HSES) conçus pour les installations intérieures et extérieures et pour fonctionner à des fréquences de 50 Hz et 60 Hz sur des réseaux de tensions assignées supérieures ou égales à 550 kV. Les HSES décrits dans le présent document sont destinés à supprimer l’arc secondaire demeurant après l’élimination des défauts sur les lignes de transport par les disjoncteurs. Pour de plus amples informations sur les HSES, voir l’Annexe A. Cette deuxième édition annule et remplace la première édition parue en 2013. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente: Le document a été mis à jour par rapport à la deuxième édition de l’IEC 62271-1:2017.

General Information

Status
Published
Publication Date
12-Jul-2021
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
13-Jul-2021
Ref Project

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IEC 62271-112
Edition 2.0 2021-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
High-voltage switchgear and controlgear –
Part 112: Alternating current high-speed earthing switches for secondary arc
extinction on transmission lines
Appareillage à haute tension –

Partie 112: Sectionneurs de terre rapides à courant alternatif pour l’extinction de

l’arc secondaire sur les lignes de transport
IEC 62271-112:2021-07(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62271-112
Edition 2.0 2021-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
High-voltage switchgear and controlgear –
Part 112: Alternating current high-speed earthing switches for secondary arc
extinction on transmission lines
Appareillage à haute tension –

Partie 112: Sectionneurs de terre rapides à courant alternatif pour l’extinction de

l’arc secondaire sur les lignes de transport
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.10; 29.130.99 ISBN 978-2-8322-1001-6

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 62271-112:2021  IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope .............................................................................................................................. 5

2 Normative references ...................................................................................................... 5

3 Terms and definitions ...................................................................................................... 5

4 Normal and special service conditions ............................................................................. 8

5 Ratings ............................................................................................................................ 8

6 Design and construction ................................................................................................ 10

7 Type tests ..................................................................................................................... 12

8 Routine tests ................................................................................................................. 15

9 Guide to the selection of HSESs (informative) ............................................................... 15

10 Information to be given with enquiries, tenders and orders (informative) ........................ 15

11 Transport, storage, installation, operating instructions and maintenance........................ 15

12 Safety ............................................................................................................................ 16

Annex A (informative) Background information on the use of HSESs ................................... 17

Annex B (informative) Induced current and voltage conditions for other cases ..................... 22

Bibliography .......................................................................................................................... 27

Figure 1 – Explanation of a multi-phase auto-reclosing scheme .............................................. 7

Figure 2 – Timing chart of HSES and circuit-breakers ........................................................... 10

Figure A.1 – Single-line diagram of a power system .............................................................. 18

Figure A.2 – Timing chart of the HSESs in relation to the transmission line circuit-

breakers ............................................................................................................................... 18

Figure A.3 – Typical timing chart showing the time between fault initiation and a

successful re-close of the transmission line circuit-breakers ................................................. 19

Figure B.1 – System condition to explain successive fault ..................................................... 23

Figure B.2 – Example of waveforms of delayed current zero phenomena .............................. 23

Figure B.3 – Typical test circuit for electromagnetic coupling test-duty of a HSES with

delayed current zero crossings ............................................................................................. 25

Figure B.4 – Typical test circuit for electrostatic coupling test-duty of HSES with

delayed current zero crossings ............................................................................................. 25

Table 1 – Nameplate information .......................................................................................... 11

Table 2 – Standard values of rated induced currents and voltages ........................................ 13

Table A.1 – Comparison of earthing switches ........................................................................ 20

Table A.2 – Comparison of a four-legged reactor and HSES ................................................. 21

Table B.1 – Preferred values for single-phase earth fault with delayed current zero

phenomena in the presence of a successive fault ................................................................. 24

Table B.2 – Preferred values for multi-phase earth faults in a double-circuit system ............. 26

Table B.3 – Preferred values for covering the cases of categories 0 and 1 ............................ 26

---------------------- Page: 4 ----------------------
IEC 62271-112:2021  IEC 2021 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 112: Alternating current high-speed earthing switches
for secondary arc extinction on transmission lines
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and

in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their

preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

may participate in this preparatory work. International, governmental and non-governmental organizations liaising

with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

rights. IEC shall not be held responsible for identifying any or all such patent rights.

IEC 62271-112 has been prepared by subcommittee 17A: Switching devices, of IEC technical

committee 17: High-voltage switchgear and controlgear. It is an International Standard.

This second edition cancels and replaces the first edition published in 2013. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
The document has been updated to the second edition of IEC 62271-1:2017.
---------------------- Page: 5 ----------------------
– 4 – IEC 62271-112:2021  IEC 2021
The text of this International Standard is based on the following documents:
FDIS Report on voting
17A/1311/FDIS 17A/1314/RVD

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.

This International Standard should be read in conjunction with IEC 62271-1:2017, to which it

refers and which is applicable, unless otherwise specified. In order to simplify the indication of

corresponding requirements, the same numbering of clauses and subclauses is used as in

IEC 62271-1:2017. Amendments to these clauses and subclauses are given under the same

numbering, whilst additional subclauses, are numbered from 101.

A list of all parts in the IEC 62271 series, published under the general title High-voltage

switchgear and controlgear, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under webstore.iec.ch in the data related to the

specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct understanding

of its contents. Users should therefore print this document using a colour printer.

---------------------- Page: 6 ----------------------
IEC 62271-112:2021  IEC 2021 – 5 –
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 112: Alternating current high-speed earthing switches
for secondary arc extinction on transmission lines
1 Scope

This part of IEC 62271 applies to AC high-speed earthing switches (hereinafter termed HSES)

designed for indoor and outdoor installation and for operation at service frequencies of 50 Hz

and 60 Hz on systems having rated voltages of 550 kV and above.

HSESs described in this document are intended to extinguish the secondary arc remaining after

clearing faults on transmission lines by the circuit-breakers.
For more detailed information on HSESs, refer to Annex A.
2 Normative references

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.

IEC 60050-441:1984, International Electrotechnical Vocabulary (IEV) – Part 441: Switchgear,

controlgear and fuses
IEC 60050-441:1984/AMD1:2000

IEC 62271-1:2017, High-voltage switchgear and controlgear – Part 1: Common specifications

for alternating current switchgear and controlgear

IEC 62271-100:2021, High-voltage switchgear and controlgear – Part 100: Alternating current

circuit-breakers

IEC 62271-102:2018, High-voltage switchgear and controlgear – Part 102: Alternating current

disconnectors and earthing switches

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

3 Terms and definitions

For the purposes of this document, the terms and definitions given in Clause 3 of

IEC 62271-1:2017, as well as the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp

Additional terms and definitions are classified so as to be aligned with the classification used

in IEC 60050-441.
---------------------- Page: 7 ----------------------
– 6 – IEC 62271-112:2021  IEC 2021
3.1 General terms and definitions
3.1.101
secondary arc

arc that remains at the faulted point after interruption of the short-circuit current fed by the

network

Note 1 to entry: This secondary arc is supplied by electrostatic or electromagnetic induction from the adjacent live

phases.
3.1.102
single-phase auto-reclosing scheme

auto-reclosing scheme in which a faulted phase circuit is opened and automatically re-closed

independently from the other phases
3.1.103
multi-phase auto-reclosing scheme

auto-reclosing scheme applied to double circuit overhead lines in which all faulted phase circuits

are opened and re-closed independently provided that at least two different phases remain un-

faulted

Note 1 to entry: An example of multi-phase auto-reclosing scheme is indicated in Figure 1.

---------------------- Page: 8 ----------------------
IEC 62271-112:2021  IEC 2021 – 7 –
Key
1) Up to 4 phases have a fault Closed circuit-breaker
2) Only the faulted phases have been tripped Open circuit-breaker
3) All circuit-breakers at both ends re-closed Re-closed circuit-breaker
Figure 1 – Explanation of a multi-phase auto-reclosing scheme

Note 2 to entry: Other than the scheme described in 3.1.102 and 3.1.103, a three-phase auto-reclosing scheme is

commonly applied. In this scheme, all three phases of one circuit are tripped and re-closed at both ends even if a

fault occurred in one phase. So far high-speed earthing switches are rarely applied with this scheme.

3.1.104
successive fault

additional earth fault that occurs in the adjacent phase circuit(s) during the time interval between

a single-phase earth fault and the opening of the high-speed earthing switch(es)
3.2 Assemblies of switchgear and controlgear
No particular definitions.
---------------------- Page: 9 ----------------------
– 8 – IEC 62271-112:2021  IEC 2021
3.3 Parts of assemblies
No particular definitions.
3.4 Switching devices
3.4.101
high-speed earthing switch
HSES
earthing switch that has the capability to:
– make, carry and interrupt the induced current;

– withstand the recovery voltage caused by electromagnetic and/or by electrostatic couplings

prior to circuit re-closure;
– make and carry the rated short-circuit current

Note 1 to entry: The high-speed operation applies normally to both closing and opening.

Note 2 to entry: A high-speed earthing switch is not intended to be used as a maintenance earthing switch.

3.4.102
high-speed earthing switch class M0

high-speed earthing switch having a normal mechanical endurance of 1 000 operation cycles

3.4.103
high-speed earthing switch class M1

high-speed earthing switch having an extended mechanical endurance of 2 000 operation

cycles for special requirements
3.5 Parts of switchgear and controlgear
No particular definitions.
3.6 Operational characteristics of switchgear and controlgear
No particular definitions.
3.7 Characteristics quantities
No particular definitions.
4 Normal and special service conditions
Clause 4 of IEC 62271-1:2017 is applicable.
5 Ratings
5.1 General
Clause 5 of IEC 62271-1:2017 is applicable with the following additions.
NOTE Categories corresponding to the fault modes are explained in Annex B.
5.5 Rated continuous current (I )
Subclause 5.5 of IEC 62271-1:2017 is not applicable.
---------------------- Page: 10 ----------------------
IEC 62271-112:2021  IEC 2021 – 9 –
5.101 Rated short-circuit making current (I )
Subclause 5.101 of IEC 62271-102:2018 is applicable.
5.102 Rated operating sequence

The rated characteristics of the HSES are referred to the rated operating sequence.

a) C – t – O,
b) C – t – O – t – C – t – O
i1 i2 i1
Where

– t is a time that is longer than the time required for secondary arc extinction and for dielectric

recovery of air insulation at the faulted point. t is determined by users considering system

stability. The preferred value of t is 0,15 s;

– t is the intermediate time that is given by the system protection. t includes the closing

i2 i2

time of the circuit-breakers after the HSESs open, the duration of a new line fault and the

break-time of the circuit-breakers. Following this time t , the HSES can be reclosed. The

preferred value of t is 0,5 s.
In this case the HSES shall be able to operate without intentional time delay.

NOTE t and t are set by system control scheme and a HSES itself is to be operated according to its own operating

i1 i2
time.

Figure 2 shows the time chart for the rated operating sequence of C – t – O – t – C – t – O.

i1 i2 i1
---------------------- Page: 11 ----------------------
– 10 – IEC 62271-112:2021  IEC 2021
Key
Circuit- Transmission line circuit-breakers that
3 Contact touch of HSESs
breaker interrupt the fault

HSES High-speed earthing switches 4 Energizing of the opening release of the HSESs

1 Energizing of the closing circuit of the 5 Contact separation of HSESs
HSESs
2 Current start in HSESs 6 Arc extinction in HSESs
t , t Times defined in 5.102 7 Fully open position of HSESs
i1 i2

NOTE 1 A common value for the re-closing time of the circuit-breaker is 1 s to guarantee system stability.

NOTE 2 t is normally within the range of 0,15 s to 0,5 s.
NOTE 3 t is normally within the range of 0,5 s to 1 s.

NOTE 4 The operating sequence b) is for system stability requirements to cover cases where another fault occurs

on the same phase.
NOTE 5 The HSES closing time is normally less than 0,2 s.
Figure 2 – Timing chart of HSES and circuit-breakers
6 Design and construction
Clause 6 of IEC 62271-1:2017 is applicable with the following modifications.
6.5 Dependent power operation
Subclause 6.5 of IEC 62271-1:2017 is not applicable.
6.7 Independent unlatched operation (independent manual or power operation)
Subclause 6.7 of IEC 62271-1:2017 is not applicable.
6.11 Nameplates
The designation of the equipment is specified as HSES.
Items to be indicated on the nameplate are listed in Table 1.
---------------------- Page: 12 ----------------------
IEC 62271-112:2021  IEC 2021 – 11 –
Table 1 – Nameplate information
Item Abbreviation Unit
Name of manufacturer
Type designation
Serial number
Year of manufacture
Rated voltage U kV
Rated lightning impulse withstand voltage U kV
Rated switching impulse withstand voltage U kV
Rated power-frequency withstand voltage U kV
Rated short-time withstand current I kA
Rate peak withstand current I kA
Rated duration of short-circuit s
Rated short-circuit making current I kA
Filling pressure for insulation P MPa
Filling pressure for operation P MPa
Rated supply voltage(s) of auxiliary and control circuits V
Specify DC/AC (with rated frequency)
Rated frequency Hz
Mechanical endurance class M /M
1 2
Electrical endurance class E /E
1 2
Type and mass fluid (liquid or gas) for insulation M kg
Mass (including fluid) M kg
Operating sequence C-t -O or
C-t -O-t -C-t -O
r1 r2 r1
(t , t )
r1 r2
Minimum and maximum ambient temperature °C
Category (option)
Category is to refer to Clause B.2
6.12 Locking devices
Subclause 6.12 of IEC 62271-1:2017 is not applicable.
6.101 Anti-pumping device

Anti-pumping device shall be provided for pneumatic and hydraulic operating mechanism.

6.102 Special requirements for HSES

A HSES shall be able to earth transmission lines and re-open to achieve their full voltage

withstand within the dead time of the auto-reclosing duty cycle of the transmission line circuit-

breakers. The dead time is defined by system stability and is normally set around 1 s enabling

dielectric recovery of insulation capability at the fault location. Fast operating capability for both

making and breaking is required.
---------------------- Page: 13 ----------------------
– 12 – IEC 62271-112:2021  IEC 2021

The HSES shall have a capability to by-pass secondary arc current on the transmission lines.

The HSES shall have a capability to break induced current by electromagnetic and/or

electrostatic coupling on transmission lines with a transient recovery voltage specified in

Table 2.

The HSES shall have a capability to withstand recovery voltage after interruption and rated

power frequency voltage to earth (U /√3) in open position.
The HSES shall be single-pole operated, unless otherwise specified.
7 Type tests
7.1 General
Clause 7 of IEC 62271-1:2017 is applicable with the following additions.

The dielectric performance shall be verified for phase-to-earth in the open position only in

accordance with IEC 62271-1:2017.
7.3 Radio interference voltage (RIV) test
Subclause 7.3 of IEC 62271-1:2017 is applicable for open position only.
7.5 Continuous current tests
Subclause 7.5 of IEC 62271-1:2017 is not applicable.
7.101 Tests to prove the short-circuit making performance
Subclause 7.101 of IEC 62271-102:2018 is applicable.
7.102 Operating and mechanical endurance tests

Subclause 7.102 of IEC 62271-102:2018 is applicable with the following modifications.

The rated operating sequence shall be verified during mechanical operation.
The mechanical operating sequence for class M0 shall be one of the following:
a) A HSES with a specified duty cycle required C – t – O:
– 1 000 C – t – O operations.
– O – t – C – t – O
b) A HSES with a specified duty cycle C – t
i1 i2 i1
– 500 C – t – O operations, plus
– 250 C – t – O – t – C – t – O operations.
i1 i2 i1
For class M1, the number of operations shall be twice the sequence specified.

Mechanical travel characteristics shall be recorded and acceptance criteria are referred to

7.102.4.1 of IEC 62271-100:2021 with the modification of the total tolerance to 20 %

+20 +10 +0
(for example % , % or % ).
-0 -10 -20
---------------------- Page: 14 ----------------------
IEC 62271-112:2021  IEC 2021 – 13 –
7.103 Operation under severe ice conditions
Subclause 7.103 of 62271-102:2018 is applicable.
7.104 Low- and high-temperature tests
Subclause 7.104 of 62271-102:2018 is applicable.
7.105 Tests to prove the induced current making and breaking performance of HSES
7.105.1 General test conditions

Tests shall be performed in accordance with the standard condition values for HSES specified

in Table 2.
Table 2 – Standard values of rated induced currents and voltages
Rated Electromagnetic coupling Electrostatic coupling
voltage U
Rated Rated First TRV Time to first Rated induced Rated induced
induced power- peak peak current voltage
current frequency
+10 +10 +10 +10
( % ) ( % ) ( % ) ( % )
recovery
-0 -0 -0 -0
+10
( % )
-0 voltage
+10
( % )
kV(RMS) A (RMS) kV (RMS) kV(peak) ms A (RMS) kV (RMS)
550 6 800 240 580 0,6 120 115
800 6 800 240 580 0,6 170 170
1 100 / 6 800 240 580 0,6 230 235
1 200

NOTE 1 For Table 2, the rated induced voltages by electrostatic recovery voltage have a “1-cos” wave shap

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Questions, Comments and Discussion

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