1、BSI Standards Publication Explosive atmospheres Part 39: Intrinsically safe systems with electronically controlled spark duration limitation PD IEC/TS 60079-39:2015National foreword This Published Document is the UK implementation of IEC/TS 60079-39:2015. The UK participation in its preparation was
2、entrusted by Technical Committee EXL/31, Equipment for explosive atmospheres, to Sub- committee EXL/31/2, Intrinsically safe apparatus. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary pr
3、ovisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015. Published by BSI Standards Limited 2015 ISBN 978 0 580 81621 5 ICS 29.260.20 Compliance with a British Standard cannot confer immunity from legal obligations. This Published Document wa
4、s published under the authority of the Standards Policy and Strategy Committee on 30 June 2015. Amendments/corrigenda issued since publication Date Text affected PUBLISHED DOCUMENT PD IEC/TS 60079-39:2015IEC TS 60079-39 Edition 1.0 2015-06 TECHNICAL SPECIFICATION Explosive atmospheres Part 39: Intri
5、nsically safe systems with electronically controlled spark duration limitation INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.260.20 ISBN 978-2-8322-2734-3 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized
6、 distributor. colour inside 2 IEC TS 60079-39:2015 IEC 2015 CONTENTS FOREWORD . 5 INTRODUCTION . 7 1 Scope 8 2 Normative references. 8 3 Definitions . 9 4 Power-i architecture . 10 5 Requirements for Power-i devices 11 5.1 General . 11 5.2 Power-i source 11 5.3 Power-i field device . 13 5.4 Power-i
7、wiring . 14 5.5 Power-i terminator . 15 5.6 Test instruments for Power-i loop check 15 5.7 Power-i application classes . 15 6 System requirements . 16 6.1 Selection of the permissible Power- i current class of the Power-i source . 16 6.2 Verification of a Power-i system . 17 7 Assessment and testing
8、 . 19 7.1 Procedure to define safety-relevant parameters . 19 7.2 Type test . 20 7.3 Routine test 20 8 Marking of Power-i devices 20 8.1 General . 20 8.2 Examples of marking . 20 9 Instructions 21 Annex A (normative) Assessment of Power-i safety parameters 22 A.1 General . 22 A.2 Power-i specific te
9、st equipment . 22 A.2.1 Power-i universal test equipment 22 A.2.2 Power-i dummy load . 23 A.3 Determination of the safety-relevant parameters for Power-i devices and Power-i wiring . 24 A.3.1 General . 24 A.3.2 Safety-relevant parameters for the Power-i source 24 A.3.3 Safety-relevant parameters for
10、 the Power-i field devices . 31 A.3.4 Safety-relevant parameters for Power-i wiring . 34 A.3.5 Safety-relevant parameters for the Power-i terminator . 36 Annex B (informative) Explanation and details of the Power-i basic concept 37 B.1 Physical basics of an ignition . 37 B.2 Output characteristics o
11、f a Power-i source . 39 B.3 Measurement and scientific results as basis for Power- i minimum ignition values . 41 B.3.1 Test setups for the determination of the ignition probability . 41 B.3.2 Result of the spark ignition tests and their implementation in Table 3 43 PD IEC/TS 60079-39:2015IEC TS 600
12、79-39:2015 IEC 2015 3 Annex C (informative) Examples of Power-i devices and systems . 46 C.1 Power-i application for a solenoid valve . 46 C.2 Example of a generally designed Power-i source . 47 C.3 Example of a Power-i field device 47 C.4 Example of a Power-i dummy load . 48 C.5 Example of a Power-
13、i terminator 48 Annex D (informative) Example of interconnection of Power-i devices including Power-i wiring to a Power-i system 50 D.1 Specific aim and given values 50 D.2 Solution example 50 Figure 1 The simplest Power-i architecture . 10 Figure 2 Example of complex Power-i concept architecture .
14、11 Figure 3 Elements of a Power-i source with voltage and current limitation . 12 Figure 4 Example of a universal Power-i field device (basic structure) . 14 Figure 5 Basic assessment procedure for a Power-i system 19 Figure A.1 Basic principle of the Power-i universal test equipment 23 Figure A.2 P
15、ulse output between terminals 3 and 1 of Figure A.1 23 Figure A.3 Basic principle of a Power-i dummy load 24 Figure A.4 Basic principle of the equipment for the determination of the response time t resp-source25 Figure A.5 Example of an oscillogram to determine the response time t resp-source26 Figu
16、re A.6 Test equipment for the determination of the assessment factorAF source(basic principle) 27 Figure A.7 Test equipment for the assessment factor test for Power-i source 28 Figure A.8 Example of an oscillogram from a test of a Power-i source with an assessment factor AF = 8,29 for a break spark
17、29 Figure A.9 Test equipment for transition pulse test of a Power-i source . 30 Figure A.10 Test equipment for the determination of the assessment factor AF field device for Power-i field devices (basic principle) 32 Figure A.11 Test equipment for the transition pulse test of Power-i field devices .
18、 33 Figure A.12 Evaluation parameter of test pulse U pulsefor transition pulse test . 34 Figure A.13 Test equipment for the determination of the response time of the Power- i trunk t resp-trunk(basic principle) 35 Figure B.1 Example of a typical trace of a break spark supplied with a linearly limite
19、d source 38 Figure B.2 Example of a typical trace of a break spark limited by a Power-i source . 38 Figure B.3 Example of output set of characteristic curves of a Power-i source during load connection 40 Figure B.4 Basic principle of a Power-i power source for the voltage threshold return mode 41 Fi
20、gure B.5 Example of output set of characteristic curves of a Power-i source in the case of a failure 41 Figure B.6 Test setup with STA for break sparks 42 Figure B.7 Test setup with STA for make sparks . 42 Figure B.8 Power-i ignition values for voltage class 24V (24 VDC) 43 Figure B.9 Power-i ignit
21、ion values for voltage class 32V (32 VDC) 44 PD IEC/TS 60079-39:2015 4 IEC TS 60079-39:2015 IEC 2015 Figure B.10 Power-i ignition values for voltage class 40V (40 VDC) 44 Figure B.11 Ignition energy in relation to the used hydrogen percentage in the gas mixtures . 45 Figure C.1 Simple solenoid valve
22、 Power-i application (example) . 46 Figure C.2 Example of a generally styled Power-i field device . 47 Figure C.3 Example of a V-limitation unit (level of protection “ib”) . 48 Figure C.4 Example of a Power-i dummy load . 48 Figure C.5 Example of a Power-i terminator 49 Table 1 Definition of Power-i
23、 voltage classes 16 Table 2 Definition of Power-i current classes 16 Table 3 Permitted combinations of Power-i application classes for Power-i sources as a function of the system response time for all Groups (n.a. = not allowed) . 17 Table 4 Power-i current classes of Power-i field devices or Power-
24、i terminators matching the current class of the Power-i source . 18 Table 5 Relevance for Power-i test procedures . 20 PD IEC/TS 60079-39:2015IEC TS 60079-39:2015 IEC 2015 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ EXPLOSIVE ATMOSPHERES Part 39: Intrinsically safe systems with electronically cont
25、rolled spark duration limitation 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
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31、aximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodi
32、es provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to
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34、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 references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9)
35、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. The main task of IEC technical committees is to prepare International Standards. In exceptiona
36、l circumstances, a technical committee may propose the publication of a technical specification when the required support cannot be obtained for the publication of an International Standard, despite repeated efforts, or the subject is still under technical development or where, for any other reason,
37、 there is the future but no immediate possibility of an agreement on an International Standard. Technical specifications are subject to review within three years of publication to decide whether they can be transformed into International Standards. IEC TS 60079-39, which is a technical specification
38、, has been prepared by subcommittee 31G: Intrinsically safe apparatus, of IEC technical committee 31: Equipment for explosive atmospheres. PD IEC/TS 60079-39:2015 6 IEC TS 60079-39:2015 IEC 2015 The text of this technical specification is based on the following documents: Enquiry draft Report on vot
39、ing 31G/236A/DTS 31G/242/RVC Full information on the voting for the approval of this technical specification 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 in the IEC 60079 se
40、ries, published under the general title Explosive atmospheres, can be found on the IEC website. 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:/webstore.iec.ch“ in the data related to the specif
41、ic publication. At this date, the publication will be transformed into an International standard, reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. IMPORTANT The colour inside logo on the cover page of this publi
42、cation 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. PD IEC/TS 60079-39:2015IEC TS 60079-39:2015 IEC 2015 7 INTRODUCTION This part of IEC 60079, which is a Technic
43、al Specification, is being issued as a “prospective standard for provisional application” in the field of Explosive Atmospheres Intrinsically safe systems with electronically controlled spark duration limitation because there is an urgent need for guidance on how standards in this field should be us
44、ed to meet an identified need. Intrinsically safe systems with electronically controlled spark duration can provide more power available in intrinsically safe circuits while maintaining the level of protection “ib” or “ic”. In addition to limiting the voltage and current (similar to conventional int
45、rinsically safe circuits), the duration of the spark is limited, which also restricts the amount of energy available for ignition. The general requirements for the installation of IS equipment are applicable to Power-i circuits. This new technology allows an expansion in the field of industrial appl
46、ications using the type of protection Intrinsic Safety i. This technology, however, requires a new and more extensive approach of the type of protection Intrinsic Safety “i”. PD IEC/TS 60079-39:2015 8 IEC TS 60079-39:2015 IEC 2015 EXPLOSIVE ATMOSPHERES Part 39: Intrinsically safe systems with electr
47、onically controlled spark duration limitation 1 Scope This Technical Specification specifies the construction, testing, installation and maintenance of Power-i apparatus and systems which utilise electronically controlled spark duration limitation to maintain an adequate level of intrinsic safety. T
48、his Technical Specification contains requirements for intrinsically safe apparatus and wiring intended for use in explosive atmospheres and for associated apparatus intended for connection to intrinsically safe circuits entering such atmospheres. This Technical Specification excludes the level of pr
49、otection “ia” and the use of software- controlled circuits. This Technical Specification applies to electrical equipment utilising voltages not higher than 40 V d.c. and a safety factor 1,5 for Groups IIB, IIA, I and III. It is also applicable to Group IIC “ic” apparatus with a safety factor 1,0. Group IIC “ib” apparatus with a safety factor 1,5 are restricted to voltages up to 32 V d.c. This type of protection is applicable t
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