IEEE Std 97-1969 IEEE Recommended Practice for Specifying Service Conditions in Electrical Standards.pdf
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1、IEEE Std 97-1969 IEE E Recommended Practice for Specifying Service Conditions in Electrical Standards (A supplement t o IEEE Standards Publication No. 1 “General Principles for Temperature Limits i n the Rating of Electric EauiDment”) Publlehd by The InrtlMe of Electrical and EieJctronicr Engineers,
2、 Inc. 345 East 47th Street, New York, New York 10017 SHOO422 Authorized licensed use limited to: Peking University. Downloaded on December 26,2010 at 16:56:16 UTC from IEEE Xplore. Restrictions apply. IEEE Std 97-1969 IEEE Recommended Practice for Specifying Service Conditions in Electrical Standard
3、s , 0 Copyright 1969 by The Institute of Electrical and Electronics Engineers, Inc No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise. without the prior written permission of the publisher. Authorized licensed use limited to: Peking University.
4、Downloaded on December 26,2010 at 16:56:16 UTC from IEEE Xplore. Restrictions apply. IEEE Standards documents are developed within the Technical Com- mittees of the IEEE Societies and the Standards Coordinating Commit- tees of the IEEE Standards Board. Members of the committees serve voluntarily and
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13、 16:56:16 UTC from IEEE Xplore. Restrictions apply. FOREWORD The formillat ion : b n d rcvision of St:rndards by I I I : L I I techiiicd (niniitt?r I:M residled iii noiiiiniftrmity in the treatment of service coiditioiis. This diwiinieiit h:Lq I)trn prep:irwl :is :L giiitle fur techiiic*:il c:onirii
14、iltces to iise when St.anrl;rrcls arc bciiig prep:wd or revised, wit 11 the olject of 111t:iiniiig coiisisteiwy, :Ls f:ir u pr:rrticnble, among the Staiid:irds for various kiiids of electric eqiiiiiiiiit, which iiiiist oftcii operatc. iiiitlcr thc s:mc service coiiditioiis. Service conditions are sp
15、erified to givc the 1iniit.iiig contlitins of ol)erirt ion for which stand:ml cqiiipnient. is designed. For example, anibient teriiiwat lire vnliics slioiild be selected which, iii roinhiiiatioii with stwidard tem- perature rises, limit total iiisiilntioii teniperstiires to siiitable vnliies. 13y sp
16、erifyiiig :t limitiiig :unbient value in service conditions, R readily uanblc rimplc nw:itir of stating coriditioris for which st:ind:trd rat iiigs arc riiitable is provided. The application and operatioii of standard eqiiipnient iuider roriditioiis more severe thari the liniiting nrnhient values sp
17、ecified in “Usiial Seirice Conditioiis” may somet inics he jwt ified ecoiiomically. The use of standard eqiiip merit iinder more severe conditions aid the acceptance of shorter-thnri-iisiinl life or lesa rnargin of safety may be preferred to obtaining equipment specially designed for the coiiditioii
18、s. This inay npply particiilnrly to tempera- tures if the excessive temperatures are of short diiration or infrequent occurrence, the ciimulative effects are not objectionable, 4nd low average temperatiires are prevalent. The effect of siich ime should be properly evaluated for satisfactory results.
19、* This document consists of two parts. As far as possible selections ehoiild be made from Part I for the statement of service conditions for particular equipment standards. For uniformity it is suggested that the exnct wording be used where it applies. Psrt I1 covers application and testing. Selecti
20、ons from this part are recommended for inclusion as supplementary information to specific Standards where applicable and desirable. * Weather Bureau records of outdoor temperatures for a number of citiw of the Lnited States sliow that 4OC (104.F) is eeldom ex- ceeded more than 0.5 percent of the tim
21、e and that 30C (86F) is exceeded M much M 12 percent of the time in only a wry fer l d i t i a . Indoor temperatures may be higher but statistical data are meager. For more complete information regarding tempemtiire and ita sffeceetr. see IEEE Standarda Nas. 1 and 96. ACKNOWLEDGMENT The Institute wi
22、shes to acknowledge ita indebtedneee to those who have BO freely giver, of their time and knowledge nnd have conducted experimental work on which many of the IEEE publi- cations are baaed. This publication waa prepared by the IEEE Standards Coordinating Committee No. 4, whoee membership was: G. L. M
23、oeee, Chairman H. P. Walker, scerdaty P. L. Bellsechi L . P. Mahon M. L. Schmidt J. L. Cantwell M. L. Manning H. R. Sheppard J. F. Dexter K. N. Math- C. L. Sidway* R. W. Hall G. E. Schall, Jr. * Working Group Chairman responsible for preparing the revision of this publicatior Authorized licensed use
24、 limited to: Peking University. Downloaded on December 26,2010 at 16:56:16 UTC from IEEE Xplore. Restrictions apply. Authorized licensed use limited to: Peking University. Downloaded on December 26,2010 at 16:56:16 UTC from IEEE Xplore. Restrictions apply. CONTENTS P a r t I 97-1 llltroductiou . 7 9
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