Lub transformer DC resistance tester yog ib qho cuab yeej siv los ntsuas DC tsis kam hauv cov transformers. Cov cuab yeej tshwj xeeb no yog tsim los ntsuas qhov DC tsis kam ntawm transformer windings thiab lwm yam khoom siv hluav taws xob. Nws feem ntau siv qhov tsawg-zaus AC qhov chaw thiab qhov ntsuas DC rhiab heev los ntsuas qhov tsis kam ntawm winding, uas yog tom qab ntawd tso tawm ntawm cov ntawv nyeem.
Cov hauv qab no yog cov kauj ruam yooj yim koom nrog hauv kev ntsuas qhov DC tsis kam ntawm transformer:
1. Ua raws txhua txoj cai kev nyab xeeb.
2. Ntsuas qhov ntsuas cua kub.
3. Wheatstone Bridge (windings >1 Ω)
• Tshawb xyuas qhov xwm txheej ntawm cov roj teeb sab hauv
• Kho lub Galvanometer kom siv cov cim tsis muaj tseeb
• Siv cov kev xeem coj nrog 0.1 Ω lossis tsawg dua
• Choj xeem coj
• Ua kom muaj kev sib txuas tsis zoo rau bushing terminals
• Ua qhov ntsuas kub ntawm qhov cua
• Yog tias tsim nyog, siv tus kais hloov pauv ob peb zaug
• Ntsuas tus choj winding ntxiv rau kev xeem-cov hlau lead tsis kam • Tshem tawm qhov kev sim-cov hlau lead tsis kam thiab sib piv nrog cov ntaub ntawv kuaj lub Hoobkas
• Sau cov ntaub ntawv kub thiab tiv thaiv ntawm daim ntawv xeem
• Thaum disconnecting test leads, tsis txhob ua nyob rau hauv series nrog cov hlau lead thiab winding davhlau ya nyob twg
4. Kelvin Choj thiab Volt-Amp Txoj Kev (windings<1 Ω)
• Tshawb xyuas qhov xwm txheej ntawm cov roj teeb hauv lub cev qhuav, 12-V roj teeb tsheb, lossis cov khoom siv tswj hwm
• Sov-up tswj cov khoom
• Kho lub Galvanometer kom siv cov cim tsis muaj tseeb
• Siv cov kev xeem loj txaus nrog cov kev sib txuas rau cov hlua khi thiab cov clamp-hom terminals
• Txuas lub peev xwm ua tau nyob rau hauv kev sib txuas tam sim no, ze tshaj rau qhov tsis paub tsis kam
• Ntsuas qhov tsis kam ntawm tus qauv resistor
• Ua haujlwm cov kais hloov pauv ob peb zaug kom ntseeg tau tias cov kais dej muaj kev tiv thaiv tsawg
• Ua kom tsis tshua muaj kev sib tw-kev sib txuas ncaj qha rau bushing lossis winding terminals
• Kev ruaj ntseg ua rau lub bushing terminals
• Ua qhov ntsuas kub ntawm qhov cua
• Ntsuas qhov kev tiv thaiv winding rau txhua tus kais dej thiab txhua qhov winding
• Sau cov ntaub ntawv kub thiab tiv thaiv ntawm daim ntawv xeem
• Tshem tawm lub zog khaws cia hauv qhov cua
• Tshem tawm cov khoom siv kuaj