资源描述：
《是电工的都应该知道的一些常识（electrician should know some common sense）》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、是电工的都应该知道的一些常识（Electricianshouldknowsomecommonsense）ElectricianshouldknowsomecommonsensecommonsenseThreephasefivewiresystemwithyellow,green,red,lightblue,respectively,U,V,W,Nprotectiongroundwiredoublecolor(PE)Transformerinoperation,thetransformerphasecurrentshouldnotexceedtheratedcurrent;themaxim
2、umunbalancedcurrentshallnotexceed25%oftheratedcurrent.Transformershouldbecheckedregularlyafterputtingintooperation.Inthesystemsuppliedbythesametransformer,itisnotsuitabletoprotectthegroundandprotecttheconnectionwithzero.Theratedvoltageofthetwocoilofthevoltagetransformerisgenerally100V.Thetwosideo
3、fthevoltagetransformershallnotbeshortcircuitedduringoperation.Duetotheshortcircuitwillproducealargeshort-circuitcurrent,itmayburnoutthetransformer,therefore,oncethevoltagetransformer,thetwosideareequippedwithfusesforprotection.Onesideofthetwosideofthevoltagetransformermustbegrounded.Thisistopreve
4、ntthefirstandtwocoilinsulationbreakdown,ahighpressureintothetwoside,endangeringthesafetyofthehumanbodyandequipment.Whenthecurrenttransformerworks,thetwosideisclosetotheshortcircuitcondition.Theratedcurrentofthetwocoilisgenerally5AThetwosideofthecurrenttransformermustnotbeallowedtoopenwhenoperatin
5、g,Thetwosideofthecurrenttransformerhastobegroundedatoneendtopreventtheoneortwosidewindingfrombreakingintothetwosidewhentheinsulationisbroken.Whenthecurrenttransformerisconnected,itshouldpayattentiontoitspolarityoftheoneortwocoil,andthemethodofpolarityreductionisusedinthetransformerofourcountry.In
6、stallationmustpayattentiontothewiringiscorrectandreliable,andthetwosideisnotallowedtofuseorswitch.Evenif,forsomereason,theinstrumentorotherdeviceonthetwosideistobedismantled,thetwosidemustbeshortcircuitedandthenremoved.Lowvoltageswitchreferstodisconnectingswitch,circuitbreaker,fuseandsoonunder1KV
7、Theloadcontrolledbythelowvoltagedistributionequipmentmustbeclearshunting,anditisforbiddentocontrolandconfuseonegate.Theinterlockingdeviceoflowvoltagedistributionequipmentandself-containedgeneratorequipmentshouldberelia
