① Hluav taws xob dendritic aging
Nyob rau hauv qhov kev txiav txim ntawm lub hwj chim zaus, xob laim thiab hloov overvoltage, txheej rwb thaiv tsev ntawm XLPE fais fab cable, vim qhov tsis xws ntawm lub rwb thaiv tsev nws tus kheej, xws li impurities, dej droplets, npuas, thiab lwm yam, ua rau lub zos hluav taws xob teb concentrated, impurities, dej tee dej, npuas, thiab lwm yam dissociate nyob rau hauv qhov kev txiav txim ntawm hluav taws xob teb, ua dawb electrons thiab zoo ions, thiab dawb electrons txuas ntxiv mus sib tsoo nrog lwm yam nruab nrab hais nyob rau hauv qhov kev txiav txim ntawm hluav taws xob teb, thaum hluav taws xob teb loj txaus, Thaum cov hluav taws xob dawb tau nrawm dua thiab lub zog mus txog lub zog dawb ntawm cov khoom nruab nrab uas lawv sib tsoo, kev sib tsoo yuav tshwm sim, thiab cov hluav taws xob dawb tshiab thiab cov ions zoo yuav raug tsim tawm. Qhov no yuav ua rau kom cov dawb electrons, thiab cov hluav taws xob dawb uas tsim los ntawm kev sib tsoo dissociation yuav koom nrog kev sib tsoo, tsim kev sib tsoo tshiab. Tom qab ntau qhov kev sib tsoo, ntau cov electrons thiab cov ions zoo yuav raug tsim tawm. Ntawm ib sab, tus naj npawb ntawm cov electrons yog nce, ntawm qhov tod tes, Lub cheeb tsam dawb txuas ntxiv txhim kho sab nraud. Vim lub randomness ntawm cov dawb electron txav, txoj kev loj hlob ntawm dawb paug yog random, es tsis yog uniformly loj hlob nyob rau hauv txhua txoj kev. Cov qauv ntawm lub cev ntawm qhov tso tawm channel lossis qhov paug tawm yog raws li qhia hauv daim duab 1.2. Qhov tshwm sim ntev ntawm qhov kev tso tawm no yuav ua rau me me tam sim no nyob rau hauv cov rwb thaiv tsev kom dhau los ntawm thiab tsim kom muaj cua sov hauv txheej rwb thaiv tsev, uas ua rau cable rwb thaiv tsev laus, uas yog dendriform aging.
② Dej tsob ntoo laus
Vim qhov kev txwv ntawm ib puag ncig kev tsim kho thiab kev tsim kho tshuab tsis tshua muaj, lub taub hau cable yuav raug tso tseg nrog cov dej noo thaum lub sijhawm ua haujlwm: thaum lub sijhawm ua haujlwm, nws tseem yuav cuam tshuam los ntawm cov av noo vim qhov av noo ntawm ib puag ncig, uas yog, lub cable. muaj noo noo nyob rau hauv. Dej muaj nyob rau hauv cov kab hluav taws xob rwb thaiv tsev txheej hauv daim ntawv ntawm cov tee dej los yog tawg. Thaum dej muaj nyob rau hauv nruab nrab hauv daim ntawv ntawm cov tee dej, vim hais tias dej tsis yog ib qho zoo insulating nruab nrab thiab muaj ib tug tej yam conductivity, lub voltage sib koom los ntawm cov dej tee dej yog heev me me, uas ua rau kom lub zog ntawm hluav taws xob teb los ntawm lub insulating. nruab nrab, ua rau dielectric tawm, thiab lub sij hawm mus sij hawm ntev tso tawm ntawm nruab nrab cov ntaub ntawv aging. Cov ntoo dej tuaj yeem muab faib ua peb hom: cov ntoo hauv cov dej uas tsim los ntawm cov txheej txheem sab hauv ntawm tus neeg xyuas pib, cov ntoo dej sab nrauv tsim los ntawm cov txheej txheem txheej txheej txheej txheej ntawm cov rwb thaiv tsev, thiab cov ntoo npauj npaim zoo li cov dej ntoo tsim los ntawm qhov sib txawv. nyob rau hauv lub rwb thaiv tsev txheej. Hauv particular, cov dej sab hauv cov ntoo tsim los ntawm cov txheej txheem semi-coj sab hauv yuav ua rau txo cov rwb thaiv tsev lub zog ntawm lub cable zoo heev.
③ Kev laus tshuaj lom neeg
Kev laus tshuaj lom neeg yog tshwm sim los ntawm kev khiav hauj lwm ib puag ncig ntawm lub hwj chim cable, xws li kev nthuav dav ntawm polyethylene sheath tshwm sim los ntawm kev tso cov kab hauv av uas muaj cov tshuaj siv roj av, ib qho hu ua vulcanization aging, uas muaj kev cuam tshuam loj tshaj plaws ntawm cov kab hluav taws xob, vim tias cov sulfide. (hydrogen sulfide, thiab lwm yam) los ntawm cov ntaub thiab rwb thaiv tsev txheej thiab tooj liab conductor ntawm cable tsim tshuaj lom neeg cov tshuaj tiv thaiv los tsim tooj liab sulfide, tooj liab oxide thiab lwm yam tshuaj, Cov tshuaj no tsim nyob rau hauv ib tug dendritic daim ntawv los ntawm sab hauv phau ntawv qhia rau lub sheath sab. nyob rau hauv lub rwb thaiv tsev txheej, ib yam li cov ntoo dej. Qhov kev laus no yog sau los ua cov ntoo tshuaj. Ntau hom roj thiab tshuaj lom neeg ua rau muaj kev sib txawv ntawm kev laus ntawm cov kab hluav taws xob hluav taws xob, tab sis tag nrho cov ntawm lawv yuav ua rau muaj kev nthuav dav ntawm ntau yam ntawm cov cable, txo qis hauv lub cev thiab cov khoom hluav taws xob.