SANS 60079-6-2009 Explosive atmospheres Part 6 Equipment protection by oil-immersion o 《爆燃性空气 第6部分 采用油浸保护设备 “o”》.pdf

1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22289-5 SANS 60079-6:2009Edition 3IEC 60079-6:2007Edition 3SOUTH AFRICAN NATIONAL STANDARD Explosive atmospheres Part 6: Equipment protect

4、ion by oil immersion “o” This national standard is the identical implementation of IEC 60079-6:2007 and is adopted with the permission of the International Electrotechnical Commission. WARNING Can only be used in conjunction with SANS 60079-0 Published by SABS Standards Division 1 Dr Lategan Road Gr

5、oenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 60079-6:2009 Edition 3 IEC 60079-6:2007 Edition 3 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS TC 65, Explosion pr

6、evention, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in June 2009. This SANS document supersedes SANS 60079-6:1995 (edition 2 as modified by IEC corr. 1:2003 and nat. amdt 1:2000). NORME INTERNAT

7、IONALECEIIECINTERNATIONAL STANDARD 60079-6Troisime ditionThird edition2007-03Atmosphres explosives Partie 6: Protection du matriel par immersion dans lhuile o Explosive atmospheres Part 6: Equipment protection by oil immersion o Pour prix, voir catalogue en vigueur For price, see current catalogue I

8、EC 2007 Droits de reproduction rservs Copyright - all rights reserved Aucune partie de cette publication ne peut tre reproduite ni utilise sous quelque forme que ce soit et par aucun procd, lectronique ou mcanique, y compris la photocopie et les microfilms, sans laccord crit de lditeur. No part of t

9、his publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Electrotechnical Commission, 3, rue de Varemb, PO Box 131, CH-1211 Geneva 20, SwitzerlandTelephon

10、e: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmailiec.ch Web: www.iec.ch CODE PRIX PRICE CODE P Commission Electrotechnique InternationaleInternational Electrotechnical Commission SANS 60079-6:2009This s tandard may only be used and printed by approved subscription and freemailing clients

11、of the SABS .60079-6 IEC:2007 3 CONTENTS FOREWORD.5 1 Scope.9 2 Normative references .9 3 Terms and definitions .11 4 Constructional requirements.13 4.1 General .13 4.2 Protective liquid.13 4.3 Group I equipment.13 4.4 Deterioration of the protective liquid 13 4.5 Guarding of fasteners15 4.6 Protect

12、ive level indication15 4.7 Limiting temperature17 4.8 Immersion depth17 4.9 Capillary or siphon action 17 4.10 Devices for draining of liquid .17 4.11 Sealed enclosures.17 4.12 Non-sealed enclosures17 4.13 External connections .19 5 Verifications and tests 19 5.1 Type tests .19 5.2 Routine tests .19

13、 6 Marking 21 7 Instructions.21 Annex A (informative) Introduction of an alternative risk assessment method encompassing “equipment protection levels“ for Ex equipment .23 Table A.1 Traditional relationship of EPLs to Zones (no additional risk assessment)27 Table A.2 Description of risk of ignition

14、protection provided .29 SANS 60079-6:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .60079-6 IEC:2007 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ EXPLOSIVE ATMOSPHERES Part 6: Equipment protection by oil immersion “o“ FOREWORD 1) The In

15、ternational 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 el

16、ectronic 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 commit

17、tees; 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

18、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 h

19、as 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 accur

20、ate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regiona

21、l publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity

22、with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any pers

23、onal 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 ref

24、erences 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 fo

25、r identifying any or all such patent rights. International Standard IEC 60079-6 has been prepared by IEC technical committee 31: Equipment for explosive atmospheres. This third edition cancels and replaces the second edition, published in 1995, and constitutes a technical revision. This part is to b

26、e used in conjunction with IEC 60079-0:2004, Electrical apparatus for explosive gas atmospheres Part 0: General requirements. The significant changes with respect to the previous edition are listed below: all requirements for third-party certification removed; added requirements for external connect

27、ions; collected all marking requirements in the marking clause; added requirements for instructions. SANS 60079-6:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .60079-6 IEC:2007 7 NOTE Technical Committee 31 has appointed a task group to

28、 consider the possible expansion of this type of protection to include level of protection Gc and sparking contacts. If a need for such an expansion is demonstrated, the resulting changes could appear in the next edition, planned for 2013. The text of this standard is based on the following document

29、s: FDIS Report on voting 31/673/FDIS 31/687/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 the parts in the IEC

30、60079 series, under the general title Explosive atmospheres, can be found on the IEC website. Future standards in this series will carry the new general title as cited above. Titles of existing standards in this series will be updated at the time of a new edition. The committee has decided that the

31、contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.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. S

32、ANS 60079-6:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .60079-6 IEC:2007 9 EXPLOSIVE ATMOSPHERES Part 6: Equipment protection by oil immersion “o“ 1 Scope This part of IEC 60079 specifies the requirements for the construction and test

33、ing of oil-immersed electrical equipment, oil-immersed parts of electrical equipment and Ex components in the type of protection oil immersion “o“, intended for use in explosive gas atmospheres. NOTE Type of protection oil immersion “o” provides equipment protection level (EPL) Gb. For further infor

34、mation, see Annex A. This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard takes precedence. This standard is applicable to electrical equipment, parts of elec

35、trical equipment, and Ex components which, in the absence of oil immersion, are not ignition capable in normal operation as determined by IEC 60079-15 or IEC 60079-11. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated referenc

36、es, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60079-0, Electrical apparatus for explosive gas atmospheres Part 0: General requirements IEC 60079-7, Electrical apparatus for explosive gas atmospheres P

37、art 7: Increased safety “e” IEC 60079-11, Electrical apparatus for explosive gas atmospheres Part 11: Intrinsic safety “i” IEC 60079-15, Electrical apparatus for explosive gas atmospheres Part 15: Construction, test and marking of type of protection “n” electrical apparatus IEC 60156, Insulating liq

38、uids Determination of the breakdown voltage at power frequency Test method IEC 60247, Insulating liquids Measurement of relative permittivity, dielectric dissipation factor (tan ) and d.c. resistivity IEC 60296, Fluids for electrotechnical applications Unused mineral insulating oils for transformers

39、 and switchgear SANS 60079-6:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .60079-6 IEC:2007 11 IEC 60529, Degrees of protection provided by enclosures (IP Code) Amendment 1 (1999) IEC 60588-2, Askarels for transformers and capacitors Pa

40、rt 2: Test methods IEC 60836: Specifications for unused silicone insulating liquids for electrotechnical purposes ISO 2719, Determination of flash point Pensky-Martens closed cup method ISO 3016, Petroleum oils Determination of pour point ISO 3104, Petroleum products Transparent and opaque liquids D

41、etermination of kinematic viscosity and calculation of dynamic viscosity 3 Terms and definitions For the purposes of this document, the following terms and definitions apply; they supplement the terms and definitions given in IEC 60079-0. NOTE Additional definitions applicable to explosive atmospher

42、es can be found in IEC 60050-426. 3.1 oil immersion “o“ type of protection in which the electrical equipment or parts of the electrical equipment are immersed in a protective liquid in such a way that an explosive gas atmosphere which may be above the liquid or outside the enclosure cannot be ignite

43、d 3.2 protective liquid mineral oil conforming to IEC 60296 or an alternative liquid meeting the requirements of 4.2 3.3 sealed equipment equipment designed and constructed in such a manner as to prevent ingress of an external atmosphere during the expansion and contraction of the internally contain

44、ed liquid during normal operation, for example, by means of an expansion vessel 3.4 non-sealed equipment equipment designed and constructed in such a manner as to allow the ingress and egress of an external atmosphere during the expansion and contraction of the internally contained fluid during norm

45、al operation 3.5 maximum permissible protective liquid level maximum level that the protective liquid can attain in normal service, taking into account the effects of expansion from the worst-case filling condition specified by the manufacturer to the condition of full load at maximum ambient temper

46、ature for which the equipment is designed SANS 60079-6:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .60079-6 IEC:2007 13 3.6 minimum permissible protective liquid level minimum level that the protective liquid can attain in normal servi

47、ce taking into account the effects of contraction from the worst-case filling condition to the condition of de-energization at minimum ambient temperature 4 Constructional requirements 4.1 General Electrical circuits and components intended to be immersed in the oil shall not be ignition capable in

48、normal operation in accordance with IEC 60079-15 or IEC 60079-11, with group I equipment required to meet the requirements for group IIA in IEC 60079-15. The enclosure of oil immersed “o” equipment shall be in accordance with IEC 60079-0. 4.2 Protective liquid Protective liquid other than mineral oi

49、l conforming to IEC 60296 shall comply with all of the following requirements: a) the protective liquid shall have a fire point of 300 C (minimum) determined by the test method indicated in IEC 60836; b) the protective liquid shall have a flash-point (closed) of 200 C (minimum) determined in accordance with ISO 2719; c) the protective liquid shall have a kinematic viscosity of 100 cSt (maximum) at 25 C determined in ac