《电力系统继电保护及应用》课件-9. Example of wiring process of screen cabinet

Exampleofwiringprocessofscreencabinet1Processstandards2Tools,rawmaterialsCONTENTS3Methods,steps4ExampleofworksitescreencabinetwiringProcessstandards01ProcessstandardsThestandardadoptedforthewiringprocessofthesecondaryscreen(cabinet)andthesecondarycircuitis"GB50171-2012SpecificationsfortheConstructionandAcceptanceoftheWiringofCabinetsandSecondaryCircuitsintheElectricalinstallationworks"Thisstandardprocessissuitableforthesecondarycircuitwiringconstructionofallscreencabinetsandoutdoorterminalboxesinsubstationswithvoltagegradesof500kVandbelow.Tools,rawmaterials02Tools,rawmaterialsCablecutter,insulatingtape,multi-strandsoftcopperwire,polyvinylchloridetape,heatshrinkabletube,numbertube(1.5mm2、2.5mm2、6mm2）Plasticties,tinbars,solderpaste,cabletags,sparecoresheaths,computertaggingmachines,computernumberingmachines,hairdryers,screwdriversMethods,steps03Methods,steps(1)Productionofcableterminal:theterminalshouldbe100~150mmabovethebottomofthescreen(box),andhigherthanthecableclampposition.Forshieldedcables,use4㎜2multi-strandsoftcopperwirestoleadtheshieldinglayerouttothegroundingcopperbar.Afterthewrappingofthecableheadincision,Afterthecableheadcutiswrapped,heatshrinktheheatshrinkabletube.

Theheatshrinkabletubemodelmatchestheouterdiameterofthecable,andthelengthshallbethesameandshallbe8cmlong.Methods,steps(2)Whenthecablesarearrangedinasinglelayer,thecablesconnectedtothetoparearrangedattheoutermostside,otherwise,theyarearrangedattheinnermostside;Whenarrangedinmultiplelayers,theuppercorecablesarearrangedintheinnerlayer,andtheremainingcablesarearrangedintheouterlayerinturn.Thecableshallbefirmlyfixed,andthecalipershallmatchtheouterdiameterofthecableharness.Methods,steps(3)Secondarywiring:Straightenthecorefirst;Useamultimetertoalignthewire,andputthenumberheadonthewirecore;

Usuallyuse"U"bendingtreatmentwiththesamearcandtightentopreventshedding.Methods,steps(4)Eachcableshallbetiedinseparatebundles,withunifiedleadspacing(15~20cm).Thecabletiesinrowsofcablesshouldbebuckledtogetherinsequence,andthejointshallbetransferredtotheinside.Methods,steps(5)Shieldlinetreatment:4mm2

multi-strandsoftcopperwireshouldbeusedandshouldbemadebyhingedmethod.Steelarmorandshieldgroundingwireshallbedistinguished(ThesteelarmorusestheKEhead,andtheshieldusesthePEhead),connectedtothegroundingcopperbarandshieldcopperbarinthescreenandcabinet.

Thecopperbarshouldbeconnectedtotheequipotentialgroundinggridusing50mm2or100mm2multi-strandsoftcopperwire(indoor50mm2,outdoor100mm2).Methods,steps(6)Thesecondarycablesbetweenthetransformers,circuitbreakers,isolationswitchesandcurrentandvoltagetransformersintheswitchyardtotheterminalboxaregroundedattheterminalbox,andtheprimaryjunctionboxisnotgrounded.Methods,steps(7)Aftertheproductionoftheshieldingline,thetemporarylogoofthecableshallbereplacedwiththecablelisting.Thelistingshallbeclear.Thelistingcontentsincludethecablenumber,model,startingpointandendpoint,andtheprocessshallbebeautifulandorderly.Methods,steps(8)Sparecoretreatment:shouldbeleftonthetopofthescreencabinet,coverthecablenumberhead,andinstallaprotectivecaptopreventthecoppercorefrombeingexposed.Methods,steps(9)Fortheboltedconnectionterminal,thelinecoreshallbebentclockwise,andthesizeofthebendingringmatchesthesizeofthebol