IEEE-1584-INT-1-3-2008.pdf
《IEEE-1584-INT-1-3-2008.pdf》由会员分享,可在线阅读,更多相关《IEEE-1584-INT-1-3-2008.pdf(4页珍藏版)》请在三一文库上搜索。
1、IEEE Std 1584-2002_Interpretation IEEE Standards Interpretation for IEEE Std 1584 -2002 IEEE Guide for Performing Arc-Flash Hazard Calculations Copyright 2008 by the Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue New York, New York 10016-5997 USA All Rights Reserved. This is a
2、n interpretation of IEEE Std 1584-2002. Interpretations are issued to explain and clarify the intent of a standard and are not intended to constitute an alteration to the original standard or to supply consulting information. Permission is hereby granted to download and print one copy of this docume
3、nt. Individuals seeking permission to reproduce and/or distribute this document in its entirety or portions of this document must contact the IEEE Standard Department for the appropriate license. Use of the information contained in this document is at your own risk. IEEE Standards Department Copyrig
4、hts and Permissions 445 Hoes Lane Piscataway, New Jersey 08855-1331, USA December 2008 Interpretation #1 Is there an accepted practice or method in which incident energies can be lowered, therefore lowering the PPE category? http:/standards.ieee.org/reading/ieee/interp/1584-2002.html (1 of 4) 2009/0
5、1/06 9:09:11 PM Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=HP Monitoring/1111111164 Not for Resale, 02/06/2009 01:55:55 MSTNo reproduction or networking permitted without license from IHS -,-,- IEEE Std 1584-2002_Interpretati
6、on Interpretation Response #1 The answer is IEEE Std 1584-2002 does not address practices or methods of lowering the incident energy because it would be outside the scope of this edition. However, the question is of great interest to users of the Guide and it will be addressed in the next edition. I
7、n the meantime, information on the subject is available from IEEE papers presented at the 2002 and 2003 PCIC Conferences. The papers are available in the PCIC record. The next opportunities to learn how people are solving this problem will be at the 2004 IAS Electrical Safety Workshop and at the 200
8、4 IAS PCIC Conference. There are, in fact, many ways to reduce incident energy. Interpretation #2 An interpretation of IEEE Std 1584-2002 “Guide for Performing Arc-Flash Hazard Calculations“ is requested. In 5.1, 7.5, and 9.1 the criteria for the model for incident energy calculations includes “Bolt
9、ed fault current in the range of 700A-106,000A.“ What is the significance of “700A,“ the lower limit of the range. Is there a particular reason why it is 700A, and not 600A, 500A, 400A, etc.? Several arc flash studies are currently being conducted in which the bolted fault current for a few busses i
10、s lower than 700A. The software tools used to conduct the studies make it clear that this fault level is outside of the range of IEEE 1584 and leave it at that. How to treat these situations is uncertain. Can it be concluded, for example, that incident energy is low and would be always be classed as
11、 NFPA 70E 2004, Category 0 (i.e. less than 2.00 cal/cm2)? Interpretation Response #2 The model in the Guide was empirically derived, i.e., it was developed through statistical analysis of test data. This type of model has no defined accuracy outside the range of the test data and, in fact, it can gi
12、ve obviously incorrect calculation results outside the stated range of the model the lower limit of 700A is based. In answer to your question on applications where the bolted fault current is below 700A, note that the Guide offers two models. The Lee Model can be applied outside the range of the emp
13、irically derived model. Note also that Annex B suggests a limit to arc duration may be applied, depending on the application. http:/standards.ieee.org/reading/ieee/interp/1584-2002.html (2 of 4) 2009/01/06 9:09:11 PM Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by I
14、HS under license with IEEELicensee=HP Monitoring/1111111164 Not for Resale, 02/06/2009 01:55:55 MSTNo reproduction or networking permitted without license from IHS -,-,- IEEE Std 1584-2002_Interpretation Recognize that the Guide is just a guide and engineering judgment must be applied when performin
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- IEEE 1584 INT 2008
链接地址:https://www.31doc.com/p-3769256.html