ITU-T K.11-199310-Principles of protection against overvoltages and overcurrents

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1、INTERNATIONALTELECOMMUNICATIONUNION)45 4+TELECOMMUNICATION(10/93)STANDARDIZATIONSECTOROFITU02/4%#4)/.!'!).34).4%2&%2%.#%02).#)0,%3/&02/4%#4)/.!'!).34/6%26/,4!'%3!.$/6%2#522%.43)45 4Recommendation+(Previously“CCITTRecommendation”)FOREWORDTheITU-T(TelecommunicationStand

2、ardizationSector)isapermanentorganoftheInternationalTelecommunicationUnion(ITU).TheITU-Tisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingRecommendationsonthemwithaviewtostandardizingtelecommunicationsonaworldwidebasis.TheWorldTelecommunicationStandardizationConference(W

3、TSC),whichmeetseveryfouryears,establishesthetopicsforstudybytheITU-TStudyGroupswhich,intheirturn,produceRecommendationsonthesetopics.TheapprovalofRecommendationsbytheMembersoftheITU-TiscoveredbytheprocedurelaiddowninWTSCResolutionNo.1(Helsinki,March1-12,1993).ITU-TRecommendationK.11wasrevise

4、dbytheITU-TStudyGroup5(1993-1996)andwasapprovedundertheWTSCResolutionNo.1procedureonthe6thofoctober1993.___________________NOTEInthisRecommendation,theexpression“Administration”isusedforconcisenesstoindicatebothatelecommunicationadministrationandarecognizedoperatingagency.ãITU1994Allrightsre

5、served.Nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromtheITU.CONTENTSRecommendationK.11(10/93)Page1Generalconsiderations..............................................................

6、.....................................................................11.1Originofdangerousovervoltagesandovercurrents.........................................................................11.2Methodsofprotection...............................................................................

7、........................................11.3Typesofprotectivedevices..............................................................................................................21.4Residualeffects...................................................