Cov ntaub ntawv nyoos siv los ua cov iav insulators muaj kev ruaj khov dua li cov ntaub ntawv raw siv los ua hluav taws xob cov plooj (porcelain) nyob rau hauv cov lus ntawm lawv cov qauv, uas tsim cov kev mob zoo rau ua kom lub zog hluav taws xob thiab lub zog ntawm iav.
Vim lub pob tshab ntawm cov iav, nws yog qhov yooj yim kom pom qhov tawg me me thiab ntau yam tsis xws luag sab hauv thiab kev puas tsuaj thaum kuaj xyuas cov duab.
Kev ntsuas hluav taws xob ntawm iav yog ntau dua li ntawm cov kab ntawm cov plooj (porcelain), thiab tib hom insulator yog tsim, thiab nws qhov loj thiab qhov hnyav yog ntau me dua li cov nplaim hluav taws xob cov kab.
Rau cov rwb thaiv tsev ntawm chav tsev, lub rwb thaiv tsev tiv thaiv tsuas yog ntsuas hauv qhov hluav taws xob tsis ua haujlwm. Cov kev cai uas cuam tshuam tau sau tseg tias ib qho megohmmeter ntawm 2500V thiab siab dua yog siv. Tam sim no, 2500V thiab 5000V megohmmeters ntau dua, thiab muaj cov twj paj nruag tshwj xeeb nrog cov hluav taws xob ntau dua. Tab sis qhov tseeb, tsis pub dhau 1 * 104MΩ, 2500V thiab 5000V megohmmeters nrog tib qhov tseeb, qhov rwb thaiv tsev tiv thaiv kev ntsuas nyob rau hauv tib cov av noo yog qhov zoo ib yam.
Rau cov tub ntxhais ntau qhov ntxig, qhov rwb thaiv tsev tiv thaiv tuaj yeem ntsuas thaum lub hwj chim txiav tawm lossis them. Cov txheej txheem txuas nrog lub siab tsis kam mus rau lub tsuj tiv thaiv, yog li ntawm megohmmeter rau ntsuas qhov ntsuas qhov rwb thaiv tsev yog nyob ntawm qhov muaj peev xwm hauv av, thiab rho tawm qhov siab-siab tsis kam tus nqi los ntawm ntsuas qhov rwb thaiv tsev tiv thaiv, uas yog cov rwb thaiv tus nqi ntawm cov kuaj cov insulator.