电气工程专外教学

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1、专业外语南京工程学院电力系蒋志平2007年2月英译中中译英词汇ApplicationBreakerpolepositiondiscordancecanoccurontheoperationofabreakerwithindependentoperatinggearsforthethreepoles.Thereasonmaybeaninterruptionintheclosingortripcoilcircuit,oramechanicalfailureresultinginastuck(卡住的，不能动的)breakerpole.Apolediscorda

2、ncecanbetoleratedforalimitedtime,forinstanceduringasingle-phasetrip-reclosecycle.Thepolediscordancefunctiondetectsabreakerpolediscordancynotgeneratedbyauto-reclosecycleandissuesatripsignalforthecircuitbreaker.1.Polediscordanceprotection(PD)三相不一致保护（PD）应用在操作有三相独立操作机构的断路器时，可能会发生断路器位

3、置不一致的情况，可能是由于跳闸线圈回路断线，或是由于机械原因使断路器某一极被卡住。三相不一致可以容许在有限的时间内，例如在单相跳合闸周期内。三相不一致功能检测自动重合闸周期之外产生的断路器三相不一致，并向断路器发出跳闸信号。FunctionalityTheoperationofthepolediscordancelogic,PD,itbasedoncheckingthepositionofthebreakerauxiliarycontacts.Threeparallelnormallyopencontactsinserieswiththreenormal

4、lyclosedcontactsinparalleloftherespectivebreakerpolesformaconditionofpolediscordance,connectedtoabinarydedicatedforthepurpose.Inaddition,thereisanautomaticdetectioncriterionbasedoncomparisonofcurrentsinthebreakerpoles.Thisfunctionisenabledforjustafewsecondsaftercloseortripcommand

5、stothebreakerinordertoavoidunwantedoperationinunsymmetricalloadconditions.1.Polediscordanceprotection(PD)三相不一致保护（PD）功能特性三相不一致逻辑PD动作基于检查断路器的辅接点位置，由断路器每相的三个常开并辅接点与三个常闭并辅接点串联构成三相不一致检查条件，然后与专用的开关量输入回路相连。另外，有一个自动检测断路器电流的电路，该功能在合闸或跳闸几秒钟后投入，以避免不对称负荷时造成非预期的操作。2.BreakerfailureprotectionAp

6、plicationInmanyprotectionapplicationslocalredundancy(冗余)isused.Onepartofthefaultclearancesystemishoweverneverduplicated,namelythecircuitbreaker.Thereforeabreakerfailureprotectioncanbeused.Thebreakerfailureprotectionisinitiatedbytripsignalsfromdifferentprotectionfunctionswithinoro

7、utsidetheprotectionterminal.Whenatripsignalissenttothebreakerfailureprotectionfist,withnooraveryshortdelay,are-tripsignalcanbesenttotheprotectedbreaker.Iffaultcurrentisflowingthroughthebreakerstillafterasettingtimeaback-uptripsignalissenttotheadjacentbreakers.Thiswillensurefaultc

8、learancealsoifthecircuitbreakerisoutofor