PTFE Cua sov Tube GFCI Tripping thiab Rwb thaiv tsev tsis zoo: Kev Ntsuas Kev Nyab Xeeb Tseem Ceeb

Lub PTFE cua sov tubing tau ua haujlwm zoo, tab sis tam sim no thaum nws siv los ntawm nws mus rau GFCI. Los yog lub breaker tsis mus, tab sis meg -ohmmeter test qhia tau hais tias tsis tshua muaj hluav taws xob tiv thaiv. Qhov no yog qhov xwm txheej txaus ntshai, hluav taws xob nkag mus rau lub ntiaj teb. Dab tsi ua rau nws thiab tuaj yeem kho tau? Qhov no yog ib qho tseem ceeb tshaj plaws thaum ntxov teeb liab ntawm hluav taws xob rwb thaiv tsev tawg nyob rau hauv industrial cua sov systems, thiab yuav tsum tau saib raws li ib tug kev nyab xeeb - tseem ceeb tshaj li qhov teeb meem kev ua tau zoo.

Lub PTFE cua sov raj yog ntim nrog compressed magnesium oxide (MgO) hmoov, uas yog qhov tseeb hluav taws xob rwb thaiv tsev. Cov khoom no tsis yog tsuas yog muab tub lim. Nws yog ib qho tseem ceeb uas txwv tsis pub lub siab voltage tam sim no los ntawm kev sib cuag nrog cov hlau sheath. MgO nyob rau hauv qhuav, zoo compacted lub xeev muaj ib tug zoo dielectric zog thiab thermal conductivity. Tab sis nws muaj ib qho tsis muaj zog: nws yog hygroscopic heev. Yog tias cov dej noo nkag mus rau hauv lub cev, MgO yuav nqus nws sai thiab cov rwb thaiv tsev yuav poob qis heev. Qhov no ua rau muaj kev tsim hluav taws xob los ntawm cov cua sov thiab cov hauv paus hauv qab. Qhov no yuav ua rau GFCI mus ncig ua si lossis muaj kev phom sij tsawg tsawg.

Moisture infiltration tuaj yeem tshwm sim los ntawm ntau qhov kev kwv yees ua tsis tiav. Ib qho ntawm feem ntau yog kev puas tsuaj rau PTFE sheath. Txawm tias me me heev tawg, pinholes los yog sib sib zog nqus khawb yuav muab ib tug conduit rau cov txheej txheem kua nkag mus rau hauv lub metallic sheath thiab ces tsiv mus nyob rau hauv lub MgO core los ntawm capillary kev txiav txim los yog siab sib txawv thaum lub sij hawm thermal cycling. Lwm qhov laj thawj yog qhov tsis ua haujlwm ntawm lub davhlau ya nyob twg foob. Lub epoxy, silicone los yog potting compound ntawm lub cable tawm yuav tsum ua kom ib puag ncig noo noo tawm, tab sis micro- tawg tuaj yeem txhim kho lub sijhawm los ntawm thermal expansion, vibration thiab tshuaj lom neeg. Thaum nkag mus, cov huab cua ntub dej maj mam lim mus rau sab hauv. Ib feem peb, feem ntau tsis pom zoo yog qhov tsis raug cia lossis tuav ua ntej kev teeb tsa. Yog tias lub raj cua sov khaws cia rau hauv qhov chaw ntub dej, thiab qhov kawg tsis raug kaw, MgO tuaj yeem nqa cov dej noo los ntawm huab cua ua ntej lub kaw lus tseem muaj zog.

Thaum xav tias qhov ua tsis tiav, kev kuaj mob yuav tsum pib nrog kev tshuaj xyuas kom pom tseeb. Tshawb xyuas tag nrho ntev ntawm lub rhaub kom tawg, distortion, discoloration lossis ib qho kos npe ntawm bulging ntawm PTFE npog qhia tias muaj kuab paug sab hauv. Kev saib xyuas tshwj xeeb yog xav tau nyob rau hauv cov cheeb tsam ib ncig ntawm qhov khoov lossis qhov chaw ntawm kev sib txuas, qhov chaw uas muaj kev ntxhov siab ntau tshaj plaws. Kuj xyuas lub davhlau ya nyob twg xaus ze. Lub foob puas yog feem ntau pom raws li tawg epoxy, xoob potting khoom, los yog xeb qhov twg cov hlau lead nkag. Cov teeb pom kev pom no yog thawj lub cim ceeb toom tias cov dej noo tuaj yeem nkag mus rau hauv cov kab hluav taws xob sab hauv.

Kev ntsuas hluav taws xob tiv thaiv nrog megohmmeter yog cov txheej txheem kuaj pom tseeb tshaj plaws. Qhov kev tiv thaiv ntawm cov cua kub conductor thiab cov hlau sab nraud yog ntsuas nrog cov pa 500V lossis 1000V DC megohmmeter. Qhov kev sim no tam sim ntawd qhia txog cov xwm txheej ntawm MgO rwb thaiv tsev. Nyob rau hauv lub cev muaj zog PTFE cua sov raj, rwb thaiv tsev tsis kam yog feem ntau siab heev -feem ntau ntau tshaj 100 MΩ. Qhov no qhia tau hais tias MgO yog qhuav, ntom thiab zoo tag nrho raws li ib tug dielectric barrier.

Yog tias qhov ntsuas tau nyob nruab nrab ntawm 1 MΩ thiab 10 MΩ, lub kaw lus tau qhia ntxov ntawm kev ya raws. Lub sijhawm no, lub raj cua sov tseem yuav ua haujlwm, tab sis nws twb nyob hauv lub xeev tsis zoo thiab yuav tsum tau kho. Yog tias qhov kev tawm tsam tsawg dua 1 MΩ, nws raug suav tias yog qhov ua tsis tiav. Cov dej ntws tam sim no ntawm qib no txaus los mus ncig GFCI cov cuab yeej thiab nthuav tawm qhov kev pheej hmoo loj ntawm hluav taws xob poob lossis hluav taws. Ib qho hluav taws xob tsis tshua muaj hluav taws xob yog lub tshuab hluav taws xob hu rau kev pab, qhia tias hluav taws xob xau qhov twg nws yuav tsum tsis txhob ua.

Qee lub sij hawm rov qab ua tau. Yog hais tias PTFE npog tsis zoo thiab tsis muaj kev puas tsuaj yog pom tseeb, qhov teeb meem feem ntau thim rov qab noo noo nqus mus rau hauv MgO. Kev ua haujlwm rwb thaiv tsev tuaj yeem rov qab los ntawm kev tswj kom qhuav. Lub raj cua sov yuav tsum muab tso rau hauv qhov cub kom qhuav ntawm 120-150℃thiab khaws cia rau 12-24 teev. Cov txheej txheem no tshem tawm cov dej noo los ntawm MgO core li no kho nws lub zog dielectric. Kev ntsuas kev tiv thaiv hluav taws xob yuav tsum tau rov ua dua tom qab txias. Feem ntau cov txiaj ntsig yuav rov zoo dua qee zaus rov qab dua 50-100 MΩ yog ​​tias qhov kev sib kis tsis hnyav.

Tab sis tsis yog txhua qhov xwm txheej zoo li qub. Yog tias PTFE sheath raug cuam tshuam, cov txheej txheem ziab yuav tsis kho qhov teeb meem tseem ceeb vim tias yuav muaj cov dej tsis tu ncua hauv kev ua haujlwm. Kev hloov pauv yog tib txoj kev nyab xeeb ntawm kev ua haujlwm hauv cov xwm txheej zoo li no. Ib yam li ntawd, yog hais tias lub davhlau ya nyob twg ntsaws ruaj ruaj yog tawg tab sis cov seem ntawm cov qauv tsis zoo, ib feem ntawm cov txheej txheem kho dua tshiab tuaj yeem ua tau. Yog tias cov rwb thaiv tsev sab hauv tau rov zoo tag nrho, cov txheej txheem ziab kom tsim nyog yog los kho lub davhlau ya nyob twg barrier nrog kub epoxy los yog ntawv pov thawj sealing tshuaj.

Yog tias qhov kev tiv thaiv insulating tseem tsis tau txhim kho tom qab ziab, qhov deterioration yog tej zaum irreversible. Qhov no feem ntau yog ib qho kev qhia txog tshuaj lom neeg ntawm MgO, kev taug qab sab hauv, lossis ntev - raug rau cov dej noo uas cuam tshuam rau cov qauv ntawm cov rwb thaiv tsev mus tas li. Kev siv nws ntawm lub sijhawm no yog qhov txaus ntshai thiab yuav tsum hloov pauv.

"Qhov no yog cov txheej txheem tseem ceeb heev thiab kev nyab xeeb yog qhov tseem ceeb. Tsis txhob ua kom lub zog ntawm PTFE lub raj cua sov yog tias cov rwb thaiv tsev tiv thaiv tsawg dua 1 MΩ. Qhov no muab txoj hauv kev ncaj qha rau kev xau uas yuav ua rau hluav taws xob poob siab, kev puas tsuaj rau cov khoom siv lossis hluav taws kub. kev tiv thaiv kev saib xyuas niaj hnub, tsis yog tom qab qhov ua tsis tiav.

Thaum kawg, kev ntsuas kev tiv thaiv hluav taws xob yog ib qho tseem ceeb tshaj plaws kev twv ua ntej rau kev nyab xeeb ntawm PTFE cua sov tubing. Kev soj ntsuam tas li tso cai rau kev nkag mus ntawm cov dej noo kom pom ntxov ua ntej kev puas tsuaj loj tshwm sim. Kev tshawb pom ntxov ntawm qhov tsis muaj zog ua rau cov pab pawg saib xyuas los txiav txim siab seb puas yuav qhuav lossis hloov, zam kev ua haujlwm tsis zoo thiab tsis tau npaj tseg.