Cov duab thermal yog ib txoj hauv kev yooj yim los txheeb xyuas qhov sib txawv ntawm qhov kub thiab txias hauv cov hluav taws xob peb theem hauv kev lag luam, piv rau lawv cov xwm txheej ua haujlwm ib txwm. Los ntawm kev tshuaj xyuas qhov sib txawv ntawm thermal ntawm tag nrho peb theem ua ke, cov kws kho tshuab tuaj yeem pom qhov ua tau zoo tsis zoo ntawm txhua ceg vim tsis sib npaug lossis thauj khoom ntau dhau.
Feem ntau qhov hluav taws xob tsis sib npaug yog tshwm sim los ntawm cov khoom siv sib txawv ntawm cov theem tab sis kuj tseem yuav yog vim muaj teeb meem ntawm cov khoom siv xws li kev sib txuas siab. Qhov tsis sib npaug me me ntawm lub zog hluav taws xob uas muab rau lub cev muaj zog yuav ua rau muaj qhov tsis sib npaug ntau dua uas yuav tsim kom muaj cua sov ntxiv thiab txo qhov torque thiab kev ua haujlwm zoo. Qhov tsis sib npaug loj heev tuaj yeem ua rau lub fuse tawg lossis tsoo lub breaker ua rau ib theem thiab cov teeb meem cuam tshuam nrog nws xws li lub cev muaj zog cua sov thiab kev puas tsuaj.
Hauv kev xyaum, nws yuav luag tsis yooj yim sua kom sib npaug cov voltages thoob plaws peb theem. Txhawm rau pab cov neeg ua haujlwm khoom siv txiav txim siab seb cov qib tsis sib npaug puas tsim nyog, Lub Tebchaws Hluav Taws Xob
Lub Koom Haum Tsim Khoom (NEMA) tau sau cov lus qhia tshwj xeeb rau cov khoom siv sib txawv. Cov qauv no yog ib qho chaw sib piv uas muaj txiaj ntsig thaum lub sijhawm saib xyuas thiab daws teeb meem.
Yuav kuaj xyuas dab tsi?
Kaw cov duab thermal ntawm txhua lub vaj huam sib luag hluav taws xob thiab lwm qhov chaw txuas siab xws li drives, disconnects, controls thiab lwm yam. Yog tias koj pom qhov kub siab dua, ua raws li lub voj voog ntawd thiab tshuaj xyuas cov ceg thiab cov loads cuam tshuam.
Tshawb xyuas cov vaj huam sib luag thiab lwm yam kev sib txuas nrog lub hau kaw. Qhov zoo tshaj plaws, koj yuav tsum tshawb xyuas cov khoom siv hluav taws xob thaum lawv sov tag thiab nyob rau hauv qhov xwm txheej ruaj khov nrog tsawg kawg 40 feem pua ntawm cov khoom siv ib txwm muaj. Ua li ntawd, kev ntsuas tuaj yeem raug soj ntsuam thiab piv rau cov xwm txheej ua haujlwm ib txwm muaj.
Yuav nrhiav dab tsi?
Qhov sib npaug ntawm qhov hnyav yuav tsum sib npaug rau qhov kub thiab txias sib npaug. Hauv qhov xwm txheej tsis sib npaug ntawm qhov hnyav, qhov hnyav dua ntawm cov theem (cov) yuav zoo li sov dua li lwm tus, vim yog qhov kub uas tsim los ntawm kev tiv thaiv. Txawm li cas los xij, qhov hnyav tsis sib npaug, qhov hnyav ntau dhau, kev sib txuas tsis zoo, thiab qhov teeb meem harmonic tuaj yeem tsim cov qauv zoo sib xws. Kev ntsuas qhov hnyav hluav taws xob yog qhov yuav tsum tau ua kom kuaj xyuas qhov teeb meem.
Lub voj voog lossis ceg txias dua li qub yuav qhia tau tias muaj qhov tsis ua haujlwm.
Nws yog ib txoj kev zoo los tsim ib txoj kev tshuaj xyuas tsis tu ncua uas suav nrog txhua qhov kev sib txuas hluav taws xob tseem ceeb. Siv cov software uas los nrog lub tshuab thaij duab kub, khaws txhua daim duab koj thaij rau hauv lub khoos phis tawj thiab taug qab koj qhov kev ntsuas dhau sijhawm. Ua li ntawd, koj yuav muaj cov duab pib los piv rau cov duab tom qab. Cov txheej txheem no yuav pab koj txiav txim siab seb qhov chaw kub lossis txias puas yog qhov tsis tshua muaj. Tom qab kev kho, cov duab tshiab yuav pab koj txiav txim siab seb kev kho puas ua tiav.
Dab tsi sawv cev rau "kev ceeb toom liab?"
Kev kho yuav tsum tau muab qhov tseem ceeb tshaj plaws los ntawm kev nyab xeeb ua ntej—piv txwv li, cov xwm txheej ntawm cov khoom siv uas ua rau muaj kev pheej hmoo rau kev nyab xeeb—ua raws li qhov tseem ceeb ntawm cov khoom siv thiab qhov kub nce siab npaum li cas. NETA (InterNational Electrical
Cov lus qhia ntawm Lub Koom Haum Kuaj Xyuas qhia tias qhov kub me me li 1 ° C saum toj no thiab 1 ° C siab dua li cov khoom siv zoo sib xws nrog cov khoom thauj zoo sib xws tuaj yeem qhia txog qhov tsis txaus uas tsim nyog tshawb xyuas.
Cov qauv NEMA (NEMA MG1-12.45) ceeb toom txog kev siv lub cev muaj zog ntawm qhov tsis sib npaug ntawm qhov hluav taws xob ntau tshaj ib feem pua. Qhov tseeb, NEMA pom zoo kom cov cav tov raug txo qis yog tias ua haujlwm ntawm qhov tsis sib npaug siab dua. Feem pua ntawm kev nyab xeeb tsis sib npaug sib txawv rau lwm yam khoom siv.
Lub cev muaj zog tsis ua haujlwm yog qhov tshwm sim ntau ntawm qhov hluav taws xob tsis sib npaug. Tag nrho cov nqi suav nrog tus nqi ntawm lub cev muaj zog, cov neeg ua haujlwm uas yuav tsum tau hloov lub cev muaj zog, tus nqi ntawm cov khoom pov tseg vim yog kev tsim khoom tsis sib npaug, kev ua haujlwm ntawm kab thiab cov nyiaj tau los poob thaum lub sijhawm kab tsis ua haujlwm.
Cov kev ua tom qab
Thaum daim duab thermal qhia tau hais tias tag nrho cov hlau lead sov dua li lwm yam khoom thoob plaws hauv ib feem ntawm lub voj voog, cov hlau lead yuav tsis loj lossis hnyav dhau. Tshawb xyuas qhov ntsuas ntawm cov hlau lead thiab qhov hnyav tiag tiag kom paub seb qhov twg yog qhov teeb meem. Siv lub multimeter nrog lub clamp accessory, lub clamp meter lossis lub zog ntsuas qhov zoo los xyuas qhov sib npaug ntawm tam sim no thiab kev thauj khoom ntawm txhua theem.
Ntawm sab voltage, xyuas qhov kev tiv thaiv thiab lub switchgear rau qhov poob voltage. Feem ntau, kab voltage yuav tsum nyob hauv 10% ntawm qhov ntsuas nameplate. Qhov nruab nrab voltage rau hauv av tuaj yeem yog qhov qhia txog seb koj lub cev muaj zog npaum li cas lossis tej zaum yuav yog qhov qhia txog harmonic tam sim no. Qhov nruab nrab voltage rau hauv av siab dua 3% ntawm nominal voltage yuav tsum ua rau muaj kev tshawb nrhiav ntxiv. Tsis tas li ntawd xav txog tias cov loads hloov pauv, thiab ib theem tuaj yeem qis dua yog tias ib qho loj ib-theem load los online.
Qhov hluav taws xob poob qis thoob plaws cov fuses thiab cov switches kuj tseem tuaj yeem tshwm sim ua qhov tsis sib npaug ntawm lub cev muaj zog thiab cua sov ntau dhau ntawm qhov chaw muaj teeb meem hauv paus. Ua ntej koj xav tias qhov ua rau tau pom, xyuas ob zaug nrog ob qho tib si thermal imager thiab multi-meter lossis clamp meter ntsuas tam sim no. Tsis yog lub feeder lossis branch circuits yuav tsum tau thauj mus rau qhov siab tshaj plaws uas tso cai.
Cov qauv ntsuas kev thauj khoom hauv Circuit kuj yuav tsum tso cai rau kev sib haum xeeb. Qhov kev daws teeb meem feem ntau rau kev thauj khoom ntau dhau yog rov faib cov khoom thauj ntawm cov circuits, lossis tswj hwm thaum cov khoom thauj tuaj txog thaum lub sijhawm ua haujlwm.
Siv cov software uas cuam tshuam, txhua qhov teeb meem uas xav tias pom nrog lub tshuab thaij duab kub tuaj yeem sau tseg rau hauv daim ntawv qhia uas suav nrog cov duab kub thiab cov duab digital ntawm cov khoom siv. Qhov ntawd yog txoj hauv kev zoo tshaj plaws los qhia cov teeb meem thiab kom pom zoo kho.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-16-2021