ISA 61241-18-2006 Electrical Apparatus for Use in Zone 20 Zone 21 and Zone 22 Hazardous (Classified) Locations Protection by Encapsulation mD (12 10 07)《用于专区20 专区21和专区22危险(分类)场所的电气.pdf
《ISA 61241-18-2006 Electrical Apparatus for Use in Zone 20 Zone 21 and Zone 22 Hazardous (Classified) Locations Protection by Encapsulation mD (12 10 07)《用于专区20 专区21和专区22危险(分类)场所的电气.pdf》由会员分享,可在线阅读,更多相关《ISA 61241-18-2006 Electrical Apparatus for Use in Zone 20 Zone 21 and Zone 22 Hazardous (Classified) Locations Protection by Encapsulation mD (12 10 07)《用于专区20 专区21和专区22危险(分类)场所的电气.pdf(46页珍藏版)》请在麦多课文档分享上搜索。
1、 AMERICAN NATIONAL STANDARD ANSI/ISA-61241-18 (12.10.07)-2006 (R2011) Electrical Apparatus for Use in Zone 20, Zone 21 and Zone 22 Hazardous (Classified) Locations Protection by Encapsulation “mD” Approved 29 March 2011 ANSI/ISA-61241-18 (12.10.07)-2006 (R2011), Electrical Apparatus for Use in Zone
2、20, Zone 21 and Zone 22 Hazardous (Classified) Locations - Protection by Encapsulation “mD” ISBN: 978-1-936007-91-2 Copyright 2011 by IEC and ISA. All rights reserved. Printed in the United States of America. No part of this publication may be reproduced, stored in a retrieval system, or transmitted
3、, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise), without the prior written permission of the Publisher. ISA 67 Alexander Drive P. O. Box 12277 Research Triangle Park, North Carolina 27709 USA- 3 - ANSI/ISA-61241-18 (12.10.07)-2006 (R2011) Preface This pr
4、eface, as well as all footnotes and annexes, is included for information purposes and is not part of ANSI/ISA-61241-18 (12.10.07)-2006 (R2011). This document has been prepared as part of the service of ISA toward a goal of uniformity in the field of instrumentation. To be of real value, this documen
5、t should not be static but should be subject to periodic review. Toward this end, the Society welcomes all comments and criticisms and asks that they be addressed to the Secretary, Standards and Practices Board; ISA; 67 Alexander Drive; P. O. Box 12277; Research Triangle Park, NC 27709; Telephone (9
6、19) 549-8411; Fax (919) 549-8288; E-mail: standardsisa.org. The ISA Standards and Practices Department is aware of the growing need for attention to the metric system of units in general, and the International System of Units (SI) in particular, in the preparation of instrumentation standards. The D
7、epartment is further aware of the benefits to USA users of ISA standards of incorporating suitable references to the SI (and the metric system) in their business and professional dealings with other countries. Toward this end, this Department will endeavor to introduce SI-acceptable metric units in
8、all new and revised standards, recommended practices, and technical reports to the greatest extent possible. Standard for Use of the International System of Units (SI): The Modern Metric System, published by the American Society for Testing b) any specified abnormal conditionsunder fault conditions
9、as specified in 7.2; c) in defined failure conditions. For level of protection “maD” the working voltage at any point in the encapsulation circuit shall not exceed 1 kV. For level of protection “maD“, components without additional protection shall only be used if they cannot damage the encapsulation
10、compound mechanically or thermally in the case of any fault. Alternatively, where a fault of an internal component may lead to failure of the encapsulation system due to increasing temperature, the requirements of 6.2 shall apply. NOTE Certain components whose application is allowed according to thi
11、s standard for level of protection “mbD” can possibly make the protective measure encapsulation ineffective by mechanical or thermal damage as a consequence of internal reactions. This risk should be excluded for level of protection “maD” apparatus. 4.4 Level of protection “mbD“ Level of protection
12、“mbD” shall not be capable of causing ignition in each of the following circumstances: a) in normal operation and installation conditions; b) in defined failure conditionsunder fault conditions as specified in 7.2. 4.5 Supply specifications The limiting values of the supply (rated voltage and the pr
13、ospective short circuit current) shall be stated to ensure that under the relevant level of protection, “maD” or “mbD”, the limiting temperature (see 6.3) is not exceeded. Any protective device used shall comply with the requirements of 7.7. 5 Requirements for compounds 5.1 General The documentation
14、 in accordance with 23.2 of IECANSI/ISA-61241-0 shall specify the compound(s) used and the processing method(s). As a minimum, those properties of the compound(s) on which the encapsulation “mD“ depends shall be provided. Due consideration shall be taken in the selection of encapsulating materialsco
15、mpounds to allow for the expansion of components during operation and in the event of allowable faults. ANSI/ISA-61241-18 (12.10.07)-2006 (R2011) - 18 - 5.2 Specification The manufacturer shall attest on his own responsibility that the material complies with the compound specification. The material
16、specification shall include: a) the name and address of the manufacturer of the compound; b) the exact and complete reference of the material, and, if relevant, percentage of fillers and any other additives, the mixture ratios and the type designation; c) if applicable, any treatment of the surface
17、of the compound(s), for example, varnishing; d) if applicable, to obtain correct adhesion of the compound to a component, any requirement for pre-treating of the component, for example, cleaning, etching; e) if appropriate, the result of the water absorption test in accordance with 8.1. Where this t
18、est has not been performed, the apparatus shall be marked “X“ in accordance with item l) of 29.2 of IECANSI/ISA-61241-0; f) the dielectric strength in accordance with IEC 60243-1 at the maximum temperature of the apparatus determined according to 8.2.2; g) temperature range of the compound(s) (upper
19、 and lower continuous operating temperature); h) in the case of encapsulation “mD“ apparatus where the compound is part of the outside enclosure, the temperature index TI value as defined in 6.1.4 of IECANSI/ISA-61241-0. As an alternative to the TI, the Relative Thermal Index (RTI-mechanical impact)
20、 may be determined in accordance with ANSI/UL 746B; i) the colour of the compound used for the test samples where the compound specification will be influenced by changing the colour. 6 Temperatures 6.1 General The maximum surface temperature and the maximum value of the continuous operating tempera
21、ture of the compound shall not be exceeded during normal operation. The encapsulation “mD“ apparatus shall be protected in such a way that the encapsulation “mD“ is not adversely affected under specified fault conditions. 6.2 Temperature limitation When a protective device is required to limit tempe
22、ratures for safety reasons, it shall be a non-resetting internal or external, electrical or thermal device. One device is required for level of protection “mbD” and two devices for level of protection “maD”. The thermal coupling of the device to the component being monitored shall be sufficient. For
23、 functional reasons the “mD” apparatus may also contain an additional resettable protective device. If the non-resetting protective device complies with IEC 60127ANSI/UL 248-1 or IEC 60691, only one device is necessary for both levels of protection. Where the apparatus may be subject to fault, see 7
24、.2.1, or where there is the possibility of an increased temperature, for example by an unfavourable input voltage in accordance with 7.2.1 or an unfavourable load, these shall be taken into account in determining the limiting temperature. - 19 - ANSI/ISA-61241-18 (12.10.07)-2006 (R2011) 6.3 Determin
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