Qhov tsis muaj load poob yog ib qho tseem ceeb heev, uas sawv cev rau ib tug ntau npaum li cas ntawm lub zog nyob rau hauv lub neej ntawm lub transformer. Qhov tsis muaj-load poob yog tshwm sim los ntawm qhov tsis muaj-load tam sim no uas tsim nyog los ua kom lub zog ntawm cov tub ntxhais transformer. Ntsuas qhov tsis muaj load poob thiab tsis muaj load tam sim no rau lub transformer yog ib qho tseem ceeb ntawm kev ua kom nws cov efficiency thiab kev ua tau zoo.
Qhov tsis muaj load poob ntawm lub transformer yog hais txog lub zog poob hauv lub transformer thaum nws tsis txuas nrog ib qho load. Qhov kev poob no yog vim qhov poob tseem ceeb, uas suav nrog hysteresis thiab eddy tam sim no. Qhov tsis muaj load tam sim no, ntawm qhov tod tes, yog qhov tam sim no ntws los ntawm transformer thaum nws tsis thauj khoom. Qhov tam sim no tseem hu ua magnetizing tam sim no, uas yuav tsum tau magnetize cov tub ntxhais ntawm transformer.
Vim tias muaj qhov tsawg voltages yuav tsum tau, qhov tsis muaj-load loj yog nqa tawm ntawm qhov tsawg-voltage facet ntawm transformer hauv qab qhov kev sim. Built-in txiav-ntug transformers yuav tsum tau luv luv tag nrho los ntawm daim tshev thiab condenser bushing faucets yuav tsum tau earthed. Ua ntej ua qhov kev kuaj tsis muaj kev thauj khoom, qhov voltage piv yuav tsum tau kuaj xyuas. Rau cov roj transformers, lub bushings thiab Buchholz relay yuav tsum tau vented thiab cov roj theem ntawm transformer yuav tsum tau xyuas. Ua ntej qhov kev ntsuas kev poob zoo yuav tsum nyob ib puag ncig lub transformer yuav tsum tau zoo siab los ntawm txoj kev ntawm 1,1 mus rau 1,15 zaus ntawm qhov ntsuas voltage. Lub over-excitation txo qhov tshwm sim ntawm remanence coj los ntawm txoj kev ncaj qha txiav-ntug excitation thoob plaws hauv lub cev tsis kam los yog los ntawm Switching impulse test. Txog thaum ntsuas cov nuj nqis tam sim no tsis khov kho, qhov poob qhov tseeb tsis tuaj yeem pib.