Components for low-voltage surge protective devices - Part 311: Specification for gas discharge tubes (GDT)

Gas discharge tubes (GDTs) are used for applications up to 1 000 V a.c. or 1 500 V d.c. in communication or signalling circuits. They are defined as a gap, or series of gaps, in an enclosed discharge medium other than air. They are designed to protect apparatus or personnel, or both, from high transient voltages. This standard does not specify requirements applicable to complete surge protective devices, nor does it specify total requirements for GDTs employed within electronic devices, where precise coordination between GDT performance and surge protective device withstand capability is highly critical.

Bauelemente für Überspannungsschutzgeräte für Niederspannung - Teil 311: Festlegungen für Gasentladungsableiter (ÜsAg)

Composants pour parafoudres basse tension - Partie 311: Spécifications pour les tubes à décharge dans un gaz (TDG)

Les tubes à décharge dans un gaz (TDG) sont utilisés dans des circuits de communication et de signalisation sous des tensions jusqu'à 1 000 V en courant alternatif ou 1 500 V en courant continu. Ils sont définis comme des éclateurs ou série d'éclateurs dans un espace fermé avec gaz de décharge autre que l'air. Ils sont conçus pour protéger des équipements ou des personnes, ou les deux, contre des surtensions transitoires élevées. La présente norme ne traite pas de prescriptions des parafoudres complets, ni des spécifications complètes des TDG utilisés dans les dispositifs électroniques où une coordination précise entre les performances des TDG et la résistance des parafoudres aux surtensions est primordiale.

Sestavni deli za nizkonapetostne naprave za zaščito pred prenapetostnimi udari - 311. del: Specifikacije za plinske odvodnike (GDT) (IEC 61643-311:2001)

General Information

Status
Withdrawn
Publication Date
12-Dec-2001
Current Stage
6060 - Document made available
Due Date
13-Dec-2001
Completion Date
13-Dec-2001

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SLOVENSKI SIST EN 61643-311:2005
STANDARD
november 2005
Sestavni deli za nizkonapetostne naprave za zaščito pred prenapetostnimi
udari - 311. del: Specifikacije za plinske odvodnike (GDT) (IEC 61643-
311:2001)

Components for low-voltage surge protective devices – Part 311: Specification for

gas discharge tubes (GDT) (IEC 61643-311:2001)
ICS 29.120.50; 29.240.10 Referenčna številka
SIST EN 61643-311:2005(en)

© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

---------------------- Page: 1 ----------------------
EUROPEAN STANDARD EN 61643-311
NORME EUROPÉENNE
EUROPÄISCHE NORM December 2001
ICS 31.100;33.040.99
English version
Components for low-voltage surge protective devices
Part 311: Specification for gas discharge tubes (GDT)
(IEC 61643-311:2001)
Composants pour parafoudres basse Bauelemente für
tension Überspannungsschutzgeräte für
Partie 311: Spécifications pour £les tubes Niederspannung
à décharge dans un gaz (TDG) Teil 311: Festlegungen
(CEI 61643-311:2001) für Gasentladungsableiter (ÜsAg)
(IEC 61643-311:2001)

This European Standard was approved by CENELEC on 2001-12-01. CENELEC members are bound to

comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European

Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on

application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CENELEC member into its own language and

notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,

Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,

Norway, Portugal, Spain, Sweden, Switzerland and 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

© 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 61643-311:2001 E
---------------------- Page: 2 ----------------------
EN 61643-311:2001 - 2 -
Foreword

The text of document 37B/57/FDIS, future edition 1 of IEC 61643-311, prepared by SC 37B, Specific

components for surge arresters and surge protective devices, of IEC TC 37, Surge arresters, was

submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61643-311 on

2001-12-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2002-09-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2004-12-01
Annexes designated "normative" are part of the body of the standard.
In this standard, annex ZA is normative
Annex ZA has been added by CENELEC.
__________
Endorsement notice

The text of the International Standard IEC 61643-311:2001 was approved by CENELEC as a

European Standard with the following editorial modifications:
Throughout the document, replace "a.c." by "AC" and replace "d.c." by "DC".
Delete "µs" in all x/y indications of waveforms:
- 6.1.6 : Table 4 headings (four times) and note ;
- 7.7 : third paragraph (twice) and from "surge generator" in Figures 8 and 9;

- 7.9 : subclause title, in the first paragraph and in the key to Figures 12 and 13;

- 7.10 : subclause title, in the third paragraph and in the key to Figures 14 and 15.

__________
---------------------- Page: 3 ----------------------
- 3 - EN 61643-311:2001
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

This European Standard incorporates by dated or undated reference, provisions from other

publications. These normative references are cited at the appropriate places in the text and the

publications are listed hereafter. For dated references, subsequent amendments to or revisions of any

of these publications apply to this European Standard only when incorporated in it by amendment or

revision. For undated references the latest edition of the publication referred to applies (including

amendments).

NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.
Publication Year Title EN/HD Year
IEC 60068-2-1 1990 Environmental testing EN 60068-2-1 1993
Part 2: Tests - Tests A: Cold
IEC 60068-2-20 1979 Part 2: Tests - Test T: Soldering HD 323.2.20 S3 1988
IEC 60068-2-21 1999 Part 2-21: Tests - Test U: Robustness of EN 60068-2-21 1999
terminations and integral mounting
devices
IEC 61000-4-5 1995 Electromagnetic compatibility (EMC) EN 61000-4-5 1995
Part 4-5: Testing and measurement
techniques - Surge immunity test
IEC 61180-1 1992 High-voltage test techniques for low- EN 61180-1 1994
voltage equipment
Part 1: Definitions, test and procedure
requirements
ITU-T 2000 Resistibility of telecommunication--
Recommendation equipment installed in a
K.20 telecommunications centre to
overvoltages and overcurrents
HD 323.2.20 S3 includes A2:1987 to IEC 60068-2-20.
---------------------- Page: 4 ----------------------
NORME CEI
INTERNATIONALE IEC
61643-311
INTERNATIONAL
Première édition
STANDARD
First edition
2001-10
Composants pour parafoudres basse tension –
Partie 311:
Spécifications pour les tubes à décharge
dans un gaz (TDG)
Components for low-voltage surge
protective devices –
Part 311:
Specification for gas discharge tubes (GDT)
© IEC 2001 Droits de reproduction réservés ⎯ Copyright - all rights reserved

Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in

utilisée sous quelque forme que ce soit et par aucun procédé, any form or by any means, electronic or mechanical,

électronique ou mécanique, y compris la photocopie et les including photocopying and microfilm, without permission in

microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http://www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
PRICE CODE S
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue
---------------------- Page: 5 ----------------------
61643-311 © IEC:2001 – 3 –
CONTENTS

FOREWORD...........................................................................................................................5

1 Scope...............................................................................................................................7

2 Normative references........................................................................................................7

3 Definitions and symbols ....................................................................................................9

3.1 Definitions ...............................................................................................................9

3.2 Symbols ................................................................................................................13

4 Service conditions...........................................................................................................13

4.1 Robustness of terminations....................................................................................13

4.2 Solderability...........................................................................................................13

4.3 Low temperature....................................................................................................13

4.4 Storage conditions.................................................................................................13

4.5 Operating conditions..............................................................................................13

4.6 Radiation...............................................................................................................15

5 Marking ..........................................................................................................................15

6 Electrical requirements ...................................................................................................15

6.1 Initial values ..........................................................................................................15

6.1.1 Sparkover voltages ....................................................................................15

6.1.2 Insulation resistance ..................................................................................17

6.1.3 Capacitance...............................................................................................17

6.1.4 Transverse voltage ....................................................................................17

6.1.5 DC holdover voltage...................................................................................19

6.1.6 Requirements for current-carrying capacity ................................................21

6.1.7 Requirements after application of load .......................................................21

6.1.8 Sparkover voltage......................................................................................23

6.1.9 Insulation resistance ..................................................................................23

6.1.10 Failure rates ..............................................................................................23

7 Test methods and circuits ...............................................................................................23

7.1 DC sparkover voltage ............................................................................................25

7.2 Impulse sparkover voltage .....................................................................................25

7.3 Insulation resistance..............................................................................................27

7.4 Capacitance ..........................................................................................................27

7.5 Glow-to-arc transition current, glow voltage, arc voltage.........................................27

7.6 Transverse voltage ................................................................................................31

7.7 DC holdover voltage ..............................................................................................31

7.8 Circuits and methods for testing the nominal alternating discharge current .............35

7.9 Circuit and methods for testing the nominal impulse discharge current,

waveshape 8/20 µs................................................................................................35

7.10 Circuits and methods for testing the life test with impulse currents,

waveshape 10/1 000 µs .........................................................................................37

Bibliography ..........................................................................................................................41

---------------------- Page: 6 ----------------------
61643-311 © IEC:2001 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
COMPONENTS FOR LOW-VOLTAGE SURGE PROTECTIVE DEVICES –
Part 311: Specification for gas discharge tubes (GDT)
FOREWORD

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

all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.

3) The documents produced have the form of recommendations for international use and are published in the form

of standards, technical specifications, technical reports or guides and they are accepted by the National

Committees in that sense.

4) In order to promote international unification, IEC National Committees undertake to apply IEC International

Standards transparently to the maximum extent possible in their national and regional standards. Any

divergence between the IEC Standard and the corresponding national or regional standard shall be clearly

indicated in the latter.

5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with one of its standards.

6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject

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

International Standard IEC 61643-311 has been prepared by subcommittee 37B: Specific

components for surge arresters and surge protective devices, of IEC technical committee 37:

Surge arresters.
The text of this standard is based on the following documents:
FDIS Report on voting
37B/57/FDIS 37B/60/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.

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

June 2003. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
---------------------- Page: 7 ----------------------
61643-311 © IEC:2001 – 7 –
COMPONENTS FOR LOW-VOLTAGE SURGE PROTECTIVE DEVICES –
Part 311: Specification for gas discharge tubes (GDT)
1 Scope

Gas discharge tubes (GDTs) are used for applications up to 1 000 V a.c. or 1 500 V d.c. in

communication or signalling circuits. They are defined as a gap, or series of gaps, in an

enclosed discharge medium other than air. They are designed to protect apparatus or

personnel, or both, from high transient voltages. This standard does not specify requirements

applicable to complete surge protective devices, nor does it specify total requirements for

GDTs employed within electronic devices, where precise coordination between GDT
performance and surge protective device withstand capability is highly critical.
This part of IEC 61643
– deals with GDTs having two or three electrodes;

– does not deal with mountings and their effect on GDT characteristics. Characteristics given

apply solely to GDTs mounted in the ways described for the tests;
– does not deal with mechanical dimensions;
– does not deal with quality assurance requirements;

– may not be sufficient for GDTs used on high-frequency or multi-channel systems;

– does not deal with electrostatic voltages;

– does not deal with GDTs connected in series with voltage-dependent resistors in order to

limit follow-on currents in electrical power systems;
– does not deal with hybrid or composite GDT devices.
2 Normative references

The following normative documents contain provisions which, through reference in this text,

constitute provisions of this part of IEC 61643. For dated references, subsequent amendments

to, or revisions of, any of these publications do not apply. However, parties to agreements

based on this part of IEC 61643 are encouraged to investigate the possibility of applying the

most recent editions of the normative documents indicated below. For undated references, the

latest edition of the normative document referred to applies. Members of IEC and ISO maintain

registers of currently valid International Standards.
IEC 60068-2-1:1990, Environmental testing – Part 2: Tests. Tests A: Cold
IEC 60068-2-20:1979, Environmental testing – Part 2: Tests. Test T: Soldering

IEC 60068-2-21:1999, Environmental testing – Part 2-21: Tests – Test U: Robustness of

terminations and integral mounting devices

IEC 61000-4-5:1995, Electromagnetic compatibility (EMC) – Part 4: Testing and measurement

techniques – Section 5: Surge immunity test
---------------------- Page: 8 ----------------------
61643-311 © IEC:2001 – 9 –

IEC 61180-1:1992, High-voltage test techniques for low voltage equipment – Part 1:

Definitions, test and procedure requirements

ITU-T Recommendation K.20:2000, Resistibility of telecommunication equipment installed in a

telecommunications centre to overvoltages and overcurrents
3 Definitions and symbols
3.1 Definitions
For the purpose of this part of IEC 61643, the following definitions apply.
3.1.1
arc current

current that flows after sparkover when the circuit impedance allows a current to flow that

exceeds the glow-to-arc transition current
3.1.2
arc voltage (arc mode voltage)
voltage drop across the GDT during arc current flow
3.1.3
arc-to-glow transition current
current required for the GDT to pass from the arc mode into the glow mode
3.1.4
current turn-off time

time required for the GDT to restore itself to a non-conducting state following a period of

conduction. This applies only to a condition where the GDT is exposed to a continuous

specified d.c. potential under a specified circuit condition
3.1.5
d.c. breakdown voltage

voltage at which the GDT transitions from a high-impedance off to a conduction state when a

slowly rising d.c. voltage is applied
3.1.6
d.c. holdover

in applications where a d.c. voltage exists on a line, a holdover condition is one in which a GDT

continues to conduct after it is subjected to an impulse large enough to cause breakdown.

Factors that affect the time required to recover from the conducting state include the d.c.

voltage and the d.c. current
3.1.7
d.c. holdover voltage

maximum d.c. voltage across the terminals of a GDT under which it may be expected to clear

and to return to the high-impedance state after the passage of a surge, under specified circuit

conditions
3.1.8
d.c. sparkover voltage

voltage at which the GDT sparks over when slowly increasing d.c. voltage is applied

3.1.9
GDT discharge current
current that flows through a GDT after sparkover occurs

NOTE In the event that the current passing through the GDT is alternating current, it will be r.m.s. value. In

instances where the current passing through the GDT is an impulse current, the value will be the peak value.

---------------------- Page: 9 ----------------------
61643-311 © IEC:2001 – 11 –
3.1.10
discharge voltage

peak value of voltage that appears across the terminals of a GDT during the passage of GDT

discharge current
3.1.11
discharge voltage current characteristic

variation of peak values of discharge voltage with respect to GDT discharge current

3.1.12
gas discharge tube

gap, or gaps, in an enclosed discharge medium, other than air at atmospheric pressure,

designed to protect apparatus or personnel, or both, from high transient voltages

3.1.13
glow current (glow mode current)

current that flows after breakdown when the circuit impedance limits the follow current to a

value less than the glow-to-arc transition current
3.1.14
glow-to-arc transition current
current required for the GDT to pass from the glow mode into the arc mode
3.1.15
glow voltage (glow mode voltage)
peak value of voltage drop across the GDT when a glow current is flowing
3.1.16
impulse sparkover voltage

highest value of voltage attained by an impulse of a designated voltage rate-of-rise and polarity

applied across the terminals of a GDT prior to the flow of the discharge current
3.1.17
impulse waveform

impulse waveform designated as x/y having a rise time of x µs and a decay time to half value

of y µs as standardized in IEC 61180-1
3.1.18
nominal alternating discharge current

for currents with a frequency of 15 Hz to 62 Hz, current which the GDT is designed to carry for

a defined time
3.1.19
nominal d.c. sparkover voltage

voltage specified by the manufacturer to indicate the target value of sparkover voltages of a

particular type of GDT products
3.1.20
nominal impulse discharge current

peak value of the impulse current with a defined waveshape with respect to time for which the

GDT is rated
3.1.21
sparkover (breakdown)

abrupt transition of the gap resistance from practically infinite value to a relatively low value

---------------------- Page: 10 ----------------------
61643-311 © IEC:2001 – 13 –
3.1.22
transverse voltage
for a GDT with th
...

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