Kev ntsuas kev hloov pauv impulse yog thov kom paub meej tias qhov kev tiv thaiv ntawm lub tshuab hluav taws xob rwb thaiv tsev tiv thaiv cov hluav taws xob ntau dhau thaum lub sijhawm hloov. Thaum lub sij hawm hloov impulse voltage test, lub rwb thaiv tsev ntawm windings thiab nruab nrab ntawm winding thiab lub ntiaj teb thiab withstand ntawm txawv terminals yog
kuaj.
Lub switching impulse voltage yog generated nyob rau hauv cov pa impulse voltage generators ntawm lub chaw soj nstuam. Lub polarity ntawm qhov voltage yog qhov tsis zoo thiab qhov voltage waveform feem ntau yuav tsum yog T1 / Td / T2 20/200/500 S / daim duab 12.2) raws li IEC 60076-3. Vim yog over-saturation ntawm cov tub ntxhais nyob rau hauv lub switching impulse xeem, ob peb amplitude tsawg, rov qab polarity (xws li zoo) impulses yog siv tom qab txhua qhov kev sim impulse thiaj li yuav rov pib dua lub transformer core rau nws pib mob (demagnetised). Los ntawm txoj kev no, tom ntej no impulse voltage waveform yog siv.
Tus kais txoj hauj lwm ntawm lub transformer thaum lub sij hawm kuaj yog txiav txim raws li kev xeem
Lub on-off impulse voltages yog siv rau txhua lub high-voltage davhlau ya nyob twg sequentially. Meanwhile, lub nruab nrab davhlau ya nyob twg yog earthed. Cov windings uas tsis nyob rau hauv kev sim yog sab laug qhib (earthed ntawm ib tug taw tes). Qhov kev sib txuas no zoo ib yam li qhov kev ntsuas hluav taws xob sib txuas. Lub voltgaes faib rau ntawm lub
winding yog linear zoo li qhov induced voltage test thiab qhov voltage amplitudes ntawm un-impulsed windings yog induced raws li qhov sib piv. Lub caij no, kev npaj tsim nyog yuav tsum tau ua txij li qhov voltage ntawm theem yuav yog 1,5 npaug ntawm theem-tsis nruab nrab voltage.
Qhov kev sib txuas ntawm kev sib txuas ntawm peb-theem transformers nyob ntawm; cov qauv ntawm cov tub ntxhais (peb los yog tsib-legged), qhov voltage theem ntawm theem thiab qhib los yog kaw lub xeev ntawm lub delta winding (yog tias muaj). Thaum xub thawj, ib qho hluav taws xob nrog 50% txo tus nqi yog siv ntawm qhov kev ntsuam xyuas, tom qab ntawd impulse voltages ntawm tag nrho cov nqi thiab ntawm cov lej muab hauv cov qauv siv. Tus nqi siab tshaj ntawm qhov voltage yog ntsuas. Qhov kev hloov ntawm qhov hluav taws xob waveform thiab winding tam sim no yog ntsuas nrog ib qho tshwj xeeb ntsuas ntsuas thiab kaw. Lub negativities nyob rau hauv lub transformer thaum lub sij hawm xeem yog txiav txim los ntawm kev sib piv cov voltage thiab tam sim no oscillograms. Qhov tshwm sim tam sim ntawd ntawm qhov hluav taws xob (surges) thiab lub suab txawv txav qhia tias deformation ntawm rwb thaiv tsev nyob rau hauv lub transfomer. Lub deformation ntawm voltage waveform thiab nce nyob rau hauv lub suab nrov vim sib nqus saturation ntawm cov tub ntxhais yuav tsum tsis txhob muab suav hais tias yog txhaum.