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. Qhov loj poob tiag tsis tuaj yeem pib kom txog thaum ntsuas cov nuj nqis tsis khov kho.
Hloov impulses nrog rau xob laim impulses muaj cov qauv yoj duab. Txhawm rau tiv thaiv flashovers ntawm huab cua-sab ntawm transformer bushings, lub polarity ntawm impulse voltages feem ntau tsis zoo. Vim lawv qhov txawv txav aperiodic waveform transient voltages tsis tuaj yeem tsim tau zoo kawg nkaus.
Kev npaj
Ua ntej ua qhov kev ntsuam xyuas impulse (Lightning- thiab Switching impulse), lub transformer yuav raug kuaj xyuas cov ntsiab lus hauv qab no:
lub sij hawm sawv
lees paub qhov ntsuas ntawm qhov sib piv voltage, polarity thiab winding kuj
roj qib thiab zoo
Qhov cua Buchholz relay thiab porcelain bushings
luv-circuit thiab lub ntiaj teb ib qho built-in transformers
ntiaj teb lub capacitive bushing kais
tshawb xyuas on-load lossis off-load kais hloov pauv txoj haujlwm
Cov kauj ruam xeem
Qhov tseeb impulse xeem:
1. calibrating thiab xyuas qhov impulse voltage waveform
2. siv lub impulse voltage mus rau lub transformer nyob rau hauv kev sim (saib kev xeem ua ntu zus)
3. xyuas kom meej tias lub transformer nyob rau hauv kev sim tau tiv thaiv cov kev ntxhov siab yam tsis muaj kev puas tsuaj (los ntawm kev sib piv oscillographic kaw)
Kev ntsuas kev hloov pauv thiab xob laim hluav taws xob tau ua tiav yog tias cov ntawv kaw lus oscillograph tsis pom qhov hloov pauv (kaw zoo sib xws hauv waveform; nruab nrab ntawm qhov ntsuas hluav taws xob thiab ntsuas qhov ntsuas hluav taws xob). Yog tias cov waveforms sib txawv ntawm ib leeg, cov laj thawj yuav tsum tau txiav txim siab.