Dab tsi yog qhov tso tawm ib nrab, thiab ua li cas nws ua rau lub tshuab hluav taws xob tsis ua haujlwm?
Ib nrab tso tawm (PD) yog ib qho hluav taws xob tawg hauv cheeb tsam uas tsis cuam tshuam tag nrho cov rwb thaiv tsev. Nws tshwm sim nyob rau hauv voids, gas npuas, roj qhov chaw, los yog raws li rwb thaiv tsev qhov chaw uas lub zos hluav taws xob teb tshaj lub dielectric zog.
Physics ntawm PD:
• Electron bombardment - rhuav tshem polymer chains hauv ntawv/roj.
• Localized cua sov - mus txog ob peb puas degree, carbonizing rwb thaiv tsev.
• Chemical degradation - ua H₂, C₂H₂, CO (detectable by DGA).
• Kev tsim cov kua qaub - cellulose decomposition accelerates kev laus.
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Theem |
Kev ua si |
Txoj kev kuaj xyuas |
Lub Sijhawm Ua Tsis Taus |
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Inception |
Micro-voids tso tawm tsis tu ncua |
UHF / HFCT (sensitive) |
Xyoo |
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Kev loj hlob |
Kev tso tawm yuav ruaj khov & rov ua dua |
PD saib + DGA |
Lub hli |
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Kev nrawm |
Nto taug qab / treeing forms |
DGA (H₂, C₂H₂ nce) + PD trending |
Lub lis piam |
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Ua ntej- ua tsis tiav |
Hnyav PD, kev tawg sai sai |
Ntau lub tswb |
Hnub rau teev |
Vim li cas PD thiaj txaus ntshai:
• Lub tshuab hluav taws xob tuaj yeem ua haujlwm tau ntau lub hlis nrog PD nquag ua ntej ua tsis tiav.
• Qhov kev puas tsuaj yog sib sau ua ke thiab irreversible - carbonized ntawv yuav rov qab tsis tau.
• ~ 30–50% ntawm nyob rau hauv - kev pab cuam transformer tsis ua hauj lwm pib los ntawm undetected PD (CIGRE).
Cov ntsiab lus tseem ceeb:
PD kuaj yog ib qho cuab yeej TRENDING. Kev nce qhov loj lossis rov ua dua tus nqi xav tau kev tshawb nrhiav tam sim.