Lub casing feem ntau yog siv rau hauv qab daus ntawm lub tsev, thiab nws yog ib lub nplhaib hlau siv los tiv thaiv cov raj xa dej los yog los pab txhawb kev txhim kho cov kav dej. Kev faib tawm ntawm cov casing muaj xws li tawv casing, hloov tau yooj yim waterproof casing, steel yeeb nkab casing thiab hlau casing.
Bushing yog ib qho khoom siv insulating uas ua rau cov neeg ua haujlwm nyob rau hauv cov khoom siv hluav taws xob lossis los ntawm cov phab ntsa. Lub qub hu ua hluav taws xob bushing thiab tom kawg yog hu ua phab ntsa bushing. Cov qauv casing feem ntau yog tsim los ntawm peb ntu: tus neeg xyuas pib (qib taw qhia), insulator thiab hlau flange. Cov conductors hla ntawm lub axis ntawm lub cylindrical insulator, thiab cov hlau annular flange yog ntsia sab nraum lub insulator thiab siv rau hauv av. Lub bushing yog ib qho insulating qauv nrog ib tug muaj zog ntsug hluav taws xob teb tivthaiv. Lub zog hluav taws xob ntawm cov hlau flange yog qhov loj heev, thiab nws yog ib qho yooj yim los tsim corona tawm thiab glide tawm raws qhov nruab nrab ntawm qhov chaw. Lub zog hluav taws xob radial ntawm lub flange thiab cov pas nrig qhia kuj yog siab heev, thiab kev tawg ntawm qhov nruab nrab insulating yog qhov tshwm sim. Ntxiv nrog rau kev siv ib qho khoom siv insulating rau bushings ntawm 35kV thiab hauv qab no, ntau cov ntaub ntawv insulating feem ntau yog siv los yog siv hluav taws xob ntsuas kev sib haum xeeb tau txais los ua kom cov axial thiab tangential hluav taws xob xa hluav taws xob sib faib yuav zoo ib yam.
Kev tsim ntawm lub casing feem ntau yog ua tau raws li:
① Tsis muaj qhov tso tawm ib nrab lossis thermal tawg tshwm sim nyob rau hauv lub sijhawm ua haujlwm ntev;
② Tsis muaj glide flash paug tshwm sim thaum lub sij hawm lub hwj chim zaus tiv thaiv voltage test;
③ Tsis muaj kev puas tsuaj los yog flashover tshwm sim thaum lub sij hawm lub zog zaus thiab impulse voltage xeem.
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