Tus qauv thiab txoj hauv kev ua haujlwm ntawm pointer hom pliers
Clamp hom ammeters feem ntau tuaj yeem muab faib ua ob hom: magnetoelectric thiab electromagnetic. Txoj kev ntsuas lub zog zaus AC lub zog yog magnetoelectric, thaum txoj kev electromagnetic yog ob qho tib si AC thiab DC. Kab lus no feem ntau qhia txog kev ntsuas lub hauv paus ntsiab lus thiab kev siv ntawm magnetoelectric clamp ammeter.
1. Cov qauv ntawm magnetoelectric clamp ammeter
Lub magnetoelectric clamp ammeter mas muaj xws li ib tug tshwj xeeb tam sim no transformer, ib tug rectified magnetoelectric ammeter, thiab nyob rau hauv circuits. Cov qauv siv feem ntau yog T301 thiab T302. Lub T301 clamp hom ammeter tsuas tuaj yeem ntsuas AC tam sim no, thaum T302 hom tuaj yeem ntsuas AC tam sim no thiab AC voltage. Kuj tseem muaj AC thiab DC dual lub hom phiaj hnab tshos clamp ammeters, xws li MG20, MG26, MG36 thiab lwm yam qauv.
2. Txoj haujlwm ua haujlwm ntawm clamp ammeter
Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm lub clamp hom ammeter yog ua raws li kev ua haujlwm ntawm lub tshuab hloov tam sim no. Thaum tuav lub clamp hom ammeter wrench nruj nreem kaw, cov tub ntxhais hlau ntawm lub tam sim no transformer yuav qhib, thiab ntsuas tam sim no hlau nkag mus rau hauv lub clamp raws li thawj winding ntawm lub tam sim no transformer. Tom qab cov hlau tseem ceeb ntawm lub loosening ciaj ntswj raug kaw, raws li lub hauv paus ntsiab lus ntawm lub transformer, ib tug induced tam sim no yog generated nyob rau hauv nws thib ob winding, thiab lub ammeter pointer deflects qhia tus nqi ntawm cov ntsuas tam sim no.
Nws yog ib nqi sau cia hais tias txij li thaum nws cov ntsiab lus yog raws li nyob rau hauv lub hauv paus ntsiab lus ntawm ib tug transformer, seb lub hlau core yog nruj nreem kaw thiab seb puas muaj ib tug loj npaum li cas ntawm cov hlau nplaum residual muaj ib tug tseem ceeb heev cuam tshuam rau cov kev ntsuas. Thaum ntsuas qhov me me tam sim no, nws yuav ua rau kev ntsuas qhov yuam kev. Nyob rau ntawm lub sijhawm no, cov hlau ntsuas tuaj yeem raug mob ob peb zaug ntxiv ntawm cov tub ntxhais hlau los hloov qhov sib piv tam sim no ntawm lub transformer thiab nce qhov tam sim no ntau. Hauv qhov no, qhov ntsuas tam sim no Ix yuav tsum yog:
Ix=Ia/N
Hauv cov qauv, Ia yog qhov kev nyeem ntawv ntawm ammeter; N yog tus naj npawb ntawm lem qhwv.
3. Siv cov kauj ruam ntawm clamp ammeter
(1) Xaiv lub clamp ammeter kom raug raws li hom thiab qib voltage ntawm ntsuas tam sim no. T301 hom yog xaiv rau cov kab dav dav AC hauv qab 500 V. Thaum ntsuas qhov tam sim no ntawm cov kab hluav taws xob siab, lub siab-voltage clamp ammeter uas phim nws qib voltage yuav tsum tau xaiv.
(2) Txheeb xyuas qhov zoo, lub puab tsaig kaw, thiab lub taub hau ntawm lub clamp ammeter rau kev ua haujlwm ib txwm muaj. Yog hais tias tus pointer tsis nyob rau hauv lub xoom txoj hauj lwm, mechanical zero adjustment yuav tsum tau ua.
(3) Xaiv qhov tsim nyog ntau yam ntawm clamp hom ammeter raws li qhov ntsuas tam sim no. Qhov kev xaiv yuav tsum yog me ntsis loj dua qhov ntsuas tus nqi tam sim no. Yog tias qhov loj ntawm qhov ntsuas tam sim no tsis paub, qhov kev kwv yees ntau tshaj plaws yuav tsum raug xaiv ua ntej.
(4) Kev ntsuas raug. Thaum ntsuas, tus ciaj ntswj yuav tsum tau nruj kom qhib lub puab tsaig. Muab cov xaim kuaj nyob rau hauv nruab nrab ntawm lub clamp, loosen lub wrench, thiab kaw lub clamp kom nruj.
(5) Tom qab nyeem ntawv, qhib lub puab tsaig thiab tawm ntawm cov hlau ntsuas, muab cov iav tso rau hauv qhov siab tshaj plaws lossis OFF txoj haujlwm ntawm qhov tam sim no.
