1、 IEC 61643-312 Edition 1.0 2013-04 INTERNATIONAL STANDARD NORME INTERNATIONALE Components for low-voltage surge protective devices Part 312: Selection and application principles for gas discharge tubes Composants pour parafoudres basse tension Partie 312: Principes de choix et dapplication pour les
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16、ition 1.0 2013-04 INTERNATIONAL STANDARD NORME INTERNATIONALE Components for low-voltage surge protective devices Part 312: Selection and application principles for gas discharge tubes Composants pour parafoudres basse tension Partie 312: Principes de choix et dapplication pour les tubes dcharge de
17、gaz INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE S ICS 31.100; 33.040.99 PRICE CODE CODE PRIX ISBN 978-2-83220-740-6 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Ma
18、ke sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 61643-312 IEC:2013 CONTENTS FOREWORD . 4 1 Scope . 6 2 Normative references . 6 3 Terms, definitions and symbols 6 3.1 Terms a
19、nd definitions 6 3.2 Symbols 10 4 Service conditions 10 4.1 General . 10 4.2 Low temperature . 10 4.3 Air pressure and altitude . 10 4.4 Ambient temperature . 10 4.5 Relative humidity . 11 5 Mechanical requirements and materials 11 5.1 General . 11 5.2 Robustness of terminations . 11 5.3 Solderabili
20、ty 11 5.4 Radiation . 11 5.5 Marking . 11 6 General 11 7 Construction . 12 7.1 Design . 12 7.2 Description 12 7.3 Fail-short (failsafe) 13 8 Function . 14 8.1 Protection principle 14 8.2 Operating mode . 14 8.3 Response behaviour 14 8.3.1 Static response behavior . 14 8.3.2 Dynamic response behavior
21、 . 14 8.4 Fail-short (failsafe) 15 9 Applications 16 9.1 Protective circuits 16 9.1.1 General . 16 9.1.2 2-point (signal line) protection . 16 9.1.3 3-point protection 17 9.1.4 5-point protection 18 9.2 Telephone/fax/modem protection . 19 9.3 Cable TV/coaxial cable protection . 19 9.4 AC line protec
22、tion 20 Bibliography 21 Figure 1 Voltage and current characteristics of a GDT . 8 Figure 2 Symbol for a two-electrode GDT 10 Figure 3 Symbol for a three-electrode GDT 10 Figure 4 Example of a two-electrode GDT . 12 61643-312 IEC:2013 3 Figure 5 Example of a three-electrode GDT 12 Figure 6 Failsafe c
23、onstruction of a three-electrode GDT using a solder pill as sensitive spacer 13 Figure 7 Failsafe construction of a three-electrode GDT, using a plastic foil as sensitive spacer 13 Figure 8 Typical response behaviour of a 230 V GDT 15 Figure 9 Spark-over voltages versus response time . 15 Figure 10
24、Current through the GDT versus response time of fail-short (failsafe) . 16 Figure 11 2-point (Signal line) protection . 17 Figure 12 3-point protection using two-electrode GDTs . 17 Figure 13 3-point protection using three-electrode GDTs 17 Figure 14 3-point protection using two-electrode GDTs with
25、fail-short . 18 Figure 15 3-point protection using three-electrode GDTs with fail-short . 18 Figure 16 5-point protection using two-electrode GDTs . 18 Figure 17 5-point protection using three-electrode GDTs 18 Figure 18 5-point protection using two-electrode GDTs with fail-short . 19 Figure 19 5-po
26、int protection using three-electrode GDTs with fail-short . 19 Figure 20 Telephone/fax/modem protection using two-electrode GDTs 19 Figure 21 Telephone/fax/modem protection using three-electrode GDTs 19 Figure 22 Cable TV/ coaxial cable protection . 20 Figure 23 AC line protection . 20 4 61643-312 I
27、EC:2013 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ COMPONENTS FOR LOW-VOLTAGE SURGE PROTECTIVE DEVICES Part 312: Selection and application principles for gas discharge tubes FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising al
28、l 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, Te
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36、ersonal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative
37、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
38、 for identifying any or all such patent rights. International Standard IEC 61643-312 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 docume
39、nts: FDIS Report on voting 37B/114/FDIS 37B/120/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 2. A list of all parts of IEC 6164
40、3 series, under the general title Components for low-voltage surge protective devices can be found on the IEC website. 61643-312 IEC:2013 5 The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/websto
41、re.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. 6 61643-312 IEC:2013 COMPONENTS FOR LOW-VOLTAGE SURGE PROTECTIVE DEVICES Part 312: Selection and application principles for gas dischar
42、ge tubes 1 Scope This part of IEC 61643 is applicable to gas discharge tubes (GDT) used for overvoltage protection in telecommunications, signalling and low-voltage power distribution networks with nominal system voltages up to 1 000 V (r.m.s.) a.c. and 1 500 V d.c. They are defined as a gap, or sev
43、eral gaps with two or three metal electrodes hermetically sealed so that gas mixture and pressure are under control. They are designed to protect apparatus or personnel, or both, from high transient voltages. This standard provides information about the characteristics and circuit applications of GD
44、Ts having two or three electrodes. 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
45、 capability is highly critical. This part of IEC 61643 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 requirem
46、ents; may not be sufficient for GDTs used on high-frequency (30 MHz); does not deal with electrostatic voltages; does not deal with hybrid overvoltage protection components or composite GDT devices. 2 Normative references The following documents, in whole or in part, are normatively referenced in th
47、is document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60068-2-1, Environmental testing Part 2-1: Tests Test A: Cold IEC 60068-2-20, Env
48、ironmental testing Part 2-20: Tests Test T: Test methods for solderability and resistance to soldering heat of devices with leads IEC 60068-2-21, Environmental testing Part 2-21: Tests Test U: Robustness of terminations and integral mounting devices IEC 61643-311, Components for low-voltage surge pr
49、otective devices Part 311: Specification for gas discharge tubes (GDT) 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply: 61643-312 IEC:2013 7 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 cu
