Cov khoom siv twg yog siv nrog epoxy iav fiber ntau daim ntaub?

Kev ntseeg siab thiab kev pabcuam lub neej ntawm kev ua haujlwm winding nyob ntawm qhov loj ntawm kev ua haujlwm ntawm cov khoom siv insulating. Cov kev cai yooj yim rau kev ua tau zoo ntawm cov ntaub ntawv insulating muaj xws li hluav taws xob kev ua tau zoo, kub tsis kam thiab cov khoom siv kho tshuab. Kab lus no Ms. hais txog cov lus qhia luv luv rau kev ua haujlwm hluav taws xob ntawm cov ntaub ntawv insulating. Cov khoom siv hluav taws xob ntawm cov ntaub ntawv insulating muaj xws li tawg lub zog, rwb thaiv tsev tiv thaiv, permittivity thiab dielectric poob. Faib qhov hluav taws xob tawg los ntawm qhov tuab ntawm cov khoom siv insulating ntawm qhov tawg, qhia hauv kilovolts / mm. Kev tawg ntawm cov ntaub ntawv insulating tuaj yeem muab faib ua peb hom: hluav taws xob tawg, thermal tawg thiab tawg tawg. Cov kev xav tau ntawm hluav taws xob ua haujlwm ntawm lub cev muaj zog rau cov khoom siv insulating yog qhov tseem ceeb tshaj plaws rau kev tawg hluav taws xob hluav taws xob lub zog thiab kev rwb thaiv tsev.

Nyob ntawm seb hom lub cev muaj zog, lwm yam kev ua haujlwm ntawm hluav taws xob tsis zoo ib yam. Piv txwv li, rwb thaiv tsev ntawm high-voltage motors yuav tsum tsis tshua muaj dielectric poob ntawm cov ntaub ntawv insulating thiab zoo corona kuj; thiab kev faib hluav taws xob ntawm cov tub ntxhais hlau thiab cov neeg xyuas pib yuav tsum tau txiav txim siab. Qhov kev siv hluav taws xob nce ntxiv. Qhov poob tangent kuj nce. Thaum qhov hluav taws xob nce mus rau ib qho nqi, cov npuas hauv nruab nrab lossis ntug ntawm cov electrode yuav raug tso tawm ib nrab, thiab qhov poob tangent dheev nce ntau. Tus nqi hluav taws xob no hu ua qhov pib dawb voltage. Hauv kev tsim vaj tsev, qhov kev ntsuas qhov hluav taws xob tsis pub dawb feem ntau yog siv los xyuas qhov sib txawv ntawm huab cua hauv cov txheej txheem rwb thaiv tsev los tswj cov rwb thaiv tsev zoo. Tsis tas li ntawd, qee cov ntaub ntawv insulating yuav tsum tau xav txog cov khoom siv hluav taws xob xws li corona tsis kam, arc tsis kam, thiab tiv thaiv cov kab xau.

Lub dielectric poob ntawm cov khoom siv insulating. Cov khoom siv insulating ua rau lub zog poob vim hluav taws xob to thiab polarization nyob rau hauv qhov kev txiav txim ntawm hluav taws xob teb. Feem ntau, poob lub zog lossis poob tangent yog siv los qhia qhov loj ntawm dielectric poob. Nyob rau hauv qhov kev txiav txim ntawm DC voltage, instantaneous charging tam sim no, nqus tam sim no thiab to tam sim no yuav dhau. Thaum siv AC voltage, qhov tam sim no them tam sim no yog ib qho reactive tam sim no (capacitive tam sim no); cov xau tam sim no yog nyob rau theem nrog qhov hluav taws xob thiab yog qhov ua haujlwm tam sim no; qhov nqus tam sim no muaj ob qho tib si reactive tam sim no thiab cov khoom siv tam sim no. Lub ntsiab yam tseem ceeb cuam tshuam qhov dielectric poob ntawm cov ntaub ntawv insulating. Txij li thaum muaj qhov sib txawv dielectric poob ntawm ntau zaus, ib qho zaus yuav tsum raug xaiv thaum ntsuas qhov poob tangent tus nqi. Feem ntau, cov khoom siv hauv lub cev muaj zog feem ntau ntsuas rau qhov dielectric poob tangent ntawm lub zog zaus.

Nyob rau hauv qhov kev txiav txim ntawm qhov hluav taws xob, cov khoom siv insulating yuav ib txwm muaj me me ntws tam sim no los ntawm nws. Ib feem ntawm qhov tam sim no ntws los ntawm cov khoom siv sab hauv; ib feem ntawm nws ntws los ntawm qhov chaw ntawm cov khoom. Yog li ntawd, lub rwb thaiv tsev resistivity yuav muab faib ua ntim resistivity thiab nto resistivity. Lub ntim resistivity characterizes lub sab hauv hluav taws xob conductivity ntawm cov khoom, thiab chav tsev yog ohm·meter; Qhov saum npoo resistivity characterizes hluav taws xob conductivity ntawm qhov chaw ntawm cov khoom, thiab chav tsev yog ohm. Lub ntim resistivity ntawm cov khoom siv insulating feem ntau yog nyob rau hauv thaj tsam ntawm 107 txog 1019 mm·m. Lub resistivity ntawm cov ntaub ntawv insulating feem ntau muaj feem xyuam nrog cov hauv qab no. Feem ntau ntawm cov impurities nyob rau hauv cov ntaub ntawv insulating tsim conductive ions, uas yuav txhawb lub dissociation ntawm polar molecules, ua rau lub resistivity poob sai heev. Raws li qhov kub thiab txias, qhov resistivity txo exponentially.