Kev tsom xam thiab kev daws qhov txawv txav tshwm sim hauv Kev Ua Haujlwm Ntawm Cov Hluav Taws Xob Transformers

Nyob rau hauv lub high-voltage switchgear ntawm 10kV nruab nrab point ungrounded system, cov voltage transformers siv yog tag nrho cov electromagnetic voltage transformers, thiab peb ib-theem voltage transformers feem ntau yog siv los tsim lub rwb thaiv tsev xyuas ntaus ntawv. Thaum siv, tau muaj qhov tshwm sim ntawm qhov tsis tseeb hauv av, thiab cov kev ntsuas hauv qab no tau coj los daws qhov teeb meem no.
Yog vim li cas 1: Sib txawv batches ntawm voltage transformers tau siv. Vim qhov sib txawv excitation yam ntxwv ntawm txawv batch ntawm voltage transformers, lub excitation impedance ntawm peb voltage transformers tsis sib npaug, uas yog sib npaug rau peb-theem asymmetric load. Qhov no yuav ua rau lub nruab nrab taw tes hloov, thiab xoom kab ke voltage yuav superimposed ntawm qhov zoo ib ntus fais fab mov voltage, uas ua rau ib tug tsis txaus nyob rau hauv lub load voltage ntawm txhua theem; Thaum qhov sib txawv ntawm excitation impedance yog qhov tseem ceeb thiab ua rau xoom ib ntus voltage ntawm ob qho kawg ntawm qhov qhib delta winding ntau dua li qhov ntsuas qhov ntsuas hluav taws xob ntawm cov cuab yeej ntsuas hluav taws xob, qhov hluav taws xob relay yuav khiav lag luam thiab tawm cov teeb liab hauv av, uas ua rau muaj qhov sib txawv ntawm qhov excitation impedance. phenomenon ntawm "false grounding".
Kev daws:
Pib los ntawm kev xaiv ntawm voltage transformers, uas yog, hloov lawv nrog cov khoom ntawm tib lub chaw tsim tshuaj paus, batch, thiab qauv los xyuas kom meej qhov zoo ib yam ntawm cov hluav taws xob silicon steel los xij siv; Nyob rau hauv cov nqe lus ntawm technology, cov txheej txheem ntawm cov hlau cores yuav tsum tau ua tib zoo xyuas kom meej tias cov excitation yam ntxwv ntawm cov pab pawg neeg ntawm voltage transformers yog zoo ib yam. Tom qab hloov qhov voltage transformer, qhov tshwm sim ntawm "false grounding" ploj lawm.
Yog vim li cas 2: Ib qho kev tiv thaiv kev sib haum xeeb tshem tawm los ntawm lub tuam txhab hluav taws xob tau teeb tsa ntawm qhov nruab nrab ntawm qhov tseem ceeb ntawm qhov hluav taws xob transformer. Vim muaj qhov thib peb harmonic tam sim no nyob rau hauv lub excitation tam sim no ntawm thawj winding ntawm lub voltage transformer, qhov thib peb harmonic nyob rau hauv peb-theem system yog xoom ib theem zuj zus. Yog li ntawd, qhov thib peb harmonic tam sim no nyob rau hauv peb voltage transformers yog superimposed los ntawm ib tug kuj harmonic eliminator, tsim ib tug siab dua peb harmonic voltage ntawm lub tshem tawm. Reacting rau sab thib ob, muaj qhov tsis txaus ntseeg nyob rau hauv peb-theem voltage thiab qhov nce ntawm qhov hluav taws xob ntawm ob qho kawg ntawm qhov qhib delta winding, ua rau xoom kab sib txuas voltage ntawm ob qho kawg ntawm qhov qhib delta winding kom tshaj qhov voltage qhov nqi ntawm lub rwb thaiv tsev soj ntsuam cov cuab yeej, ua rau lub voltage relay ua hauj lwm thiab emit ib tug grounding teeb liab, uas ua rau lub phenomenon ntawm "false grounding".
Kev daws:
Hloov nrog RXQ-6-10kV harmonic eliminator, uas yog tsim los ntawm nonlinear SiO resistor thiab linear resistor (6-7k Ω) txuas hauv series. Nws muaj tus nqi siab tsis kam (txog li ob peb puas k Ω) ntawm qhov tsis tshua muaj hluav taws xob, ua rau resonance nyuaj rau kev txhim kho hauv thawj theem; Thaum ib-theem grounding tshwm sim, qhov voltage ntawm tshaj kilovolts tshwm rau ntawm qhov nruab nrab qhov chaw tsis kam, ua rau cov tsis-linear tsis kam txo thiab tsis cuam tshuam rau kev ua haujlwm ntawm kev tiv thaiv hauv av. Vim qhov tseem ceeb thermal muaj peev xwm ntawm nonlinear resistor, nws yog txaus kom ua tau raws li cov thermal muaj peev xwm ntawm cov cuab yeej rau arc grounding.