Kev Tso Tawm Ib Nrab Hauv Cov Transformers Uas Muaj Roj: Xwm Txheej Thiab Cov Ua Rau Muaj PD Ntau Dhau

01 Kev Taw Qhia

Kev tso tawm ib feem (PD) hauv cov roj-immersed Cov Hloov Fais Fab tseem yog ib qho kev sib tw thoob ntiaj teb uas paub zoo hauv kev lag luam transformer. Muaj ntau lub tuam txhab tsim khoom tau raug kev poob loj vim yog qhov ua tsis tiav ntsig txog PD.

Tej zaum yuav muaj qhov tsis zoo ntawm PD thaum lub sijhawm kuaj hauv Hoobkas, kev tshuaj xyuas los ntawm cov neeg sab nraud, lossis ntawm cov chaw ntawm cov neeg siv khoom. Kev nrhiav cov khoom siv PD feem ntau zoo li "nrhiav koob hauv cov nyom qhuav," ua rau rov ua haujlwm ntev li ntau hnub lossis ntau lub hlis, ua rau cov chaw tsim khoom lossis cov neeg siv khoom poob qis heev.

Yog li ntawd, kev kuaj mob thiab txheeb xyuas sai sai cov ua rau muaj PD ntau dhau yog qhov tseem ceeb heev.

02 Lub Txhais thiab Xwm

Txawm hais tias tsis muaj lus txhais raug cai, tus sau txhais PD li:
[Kev tso tawm tshwm sim ntawm qhov chaw hauv lub transformer uas tseem tsis tau ua rau muaj kev puas tsuaj ntawm cov rwb thaiv tsev lossis flashover tam sim ntawd.]

Cov xwm txheej ntawm PD sib txawv ntau tab sis muaj lub ntsiab lus zoo sib xws:
[Cov qauv, cov khoom siv, lossis cov khoom tsim tsis zoo hauv lub kaw lus rwb thaiv tsev ua rau muaj kev cuam tshuam ntawm lub zog hluav taws xob hauv zos ntau dua li lub zog dielectric ntawm qhov ntawd, ua rau muaj kev tawg ntawm cov ionization rov ua dua, me me, tsis nkag mus.]

Hauv ntej, qhov xwm txheej ntawm PD yog nyob rau hauv qhov kev sib sau ua ke ntawm lub zog hluav taws xob hauv zos tshaj qhov muaj zog ntawm PD pib.

03 Cov Ua Rau Tseem Ceeb

Raws li cov txheej txheem PD, txhua yam ua rau muaj hluav taws xob ntau dhau hauv zos yuav ua rau muaj PD ntau dhau.

3.1 Qhov Chaw PD
PD tuaj yeem tshwm sim los ntawm:

Cov Bushings

 

Cov kais hloov OLTC / DETC

 

Cov thawj coj

 

Cov xov hlau

 

Cov khoom siv av

 

Cov nplaim rwb thaiv tsev / cov teeb meem sab hauv

 

Roj hloov pauv

Cov chaw uas muaj kev phom sij tshaj plaws:Cov cua tsis muaj zog nyob rau hauv cov khoom rwb thaiv tsev lossis cov pa roj hauv cov roj.
Vim li cas:Nyob rau hauv qhov kev ntxhov siab voltage, qhov muaj zog ntawm lub teb hluav taws xob yog inversely proportional rau dielectric constant (ε).

Kev rwb thaiv tsev ntawv ε ≈ 4.4

 

Cov cua khoob ε ≈ 2.0
→ Kev paub txog qhov cua tsis muaj zog ≈2.2 × lub zog teb siab dua.
Nrog lub zog tawg qis (AC ≈2kV/hli), cov qhov khoob/npuas ua rau cov chaw tsis muaj zog rau PD pib.

3.2 Hom PD
Cov hom PD feem ntau hauv Roj-Immersed Transformers:

Kev tso pa roj tawm

 

Kev tso tawm los ntawm dej noo(kev rwb thaiv tsev ntub dej)

 

Kev tso tawm hluav taws xob ntse(cov lus qhia electrode siab voltage / av)

 

Kev tso tawm ntawm cov peev xwm ntab

 

Kev tso tawm roj sib txawv zoo li wedge

 

Cov pa tawm ntawm cov khoom me me / cov khoom tsis huv

 

Cov teeb meem ntawm cov nplaum(kua nplaum ntau dhau/tsis zoo hauv cov phaj clamping/cov nplhaib kawg)

Kev Nkag Siab Tseem Ceeb:

Qhov ua ntau tshaj ntawm PD tsis tshua muaj feem cuam tshuam nrog kev tsim qauv (≈0.5% feem pua).
95%+ yog los ntawm cov khoom siv, cov txheej txheem, lossis cov khoom tsim tsis zoo.

Kev piav qhia:Thaum overvoltages (LI, LIC, SI, LTAC) raug hloov mus rau qhov sib npaug 1-feeb fais fab-zaus withstand voltage (Převod DIL na TZB), txhua yam tshaj qhov PD test voltage (IVPD). Lub rwb thaiv tsev tseem ceeb/ntev yog tsim los rau qhov xwm txheej overvoltage siab tshaj plaws.

Tsis yog.	Hom PD	Qhov chaw	Lub tshuab	Cov Ntaub Ntawv Feem Ntau
1	Kev Tawm Hluav Taws Xob Ntse	Cov khoom siv clamping, lub tank, lub bushing nce, cov xov hlau lead crimping	Lub vojvoog me me ntawm qhov nkhaus → qhov ceev ntawm lub zog siab → qhov sib sau ua ke ntawm thaj chaw siab heev	Cov ntsia hlau tsis muaj hlau thaiv ze ntawm HV electrodes; cov npoo ntse ntawm cov hlau nplaum tiv thaiv
2	Cov pa roj npuas / Cov dej tsis muaj dab tsi	Cov npuas dej hauv roj / cov khoob hauv cov khoom rwb thaiv tsev khov kho	Qhov tsis tu ncua dielectric qis (ε≈1) → kev ntxhov siab siab + lub zog tawg qis (2kV / hli)	Lub tshuab nqus tsev tsis tiav; sau roj sai; nplaum ntau dhau/tsis zoo hauv cov nplhaib kawg/spherical sib npaug
3	Kev Tso Tawm Los Ntawm Cov Dej Num	Cov xov hlau, cov rwb thaiv tsev tseem ceeb, cov xov hlau	Cov dej noo txo ​​cov zog dielectric los ntawm 60-70%	Tsis qhuav lub plawv txaus; raug cua ntau dhau thaum lub sijhawm sib dhos
4	Kev Tawm Tsam Uas Muaj Peev Xwm Nthuav Tau	Rooj ntawv xovxwm, cov khoom siv lead, cov hlau nplaum sib nqus	Kev sib sau ua ke ntawm cov nqi hluav taws xob → lub zog tso tawm sai sai	Kev tiv thaiv hlau nplaum tsis muaj av; cov nplhaib electrostatic tsis txuas zoo
5	Kev Tso Tawm Cov Khoom Phem	Dej/fibers/hlau me me hauv roj	Kev cuam tshuam ntawm thaj teb + dej ua rau muaj kev ntxhov siab ntawm thaj teb 2.9 ×	Kev lim roj tsis txaus; lub plawv muaj kuab paug; dej nkag mus

04 Lub Zeem Muag

Kev nkag siab txog cov hom PD, cov txheej txheem, qhov chaw, thiab cov ntaub ntawv kawm yog qhov tseem ceeb rau kev daws teeb meem.

Ua ke nrog cov ntsiab cai txuas transformer, kev tsim qauv, cov yam ntxwv ntawm PD waveform, polarity localization, thiab kev kuaj mob, qhov kev paub no ua rau muaj kev txheeb xyuas sai sai thiab txo qhov poob zoo.