Qhov kev xeem tanδ yog dab tsi, thiab qhov kev nyeem ntawv qhia li cas?
Lub tanδ (dissipation factor/power factor) ntsuas dielectric losses nyob rau hauv lub rwb thaiv tsev system nyob rau hauv AC voltage. Ib qho zoo tagnrho capacitor muaj xoom poob; siab dua tanδ qhia tias kev laus, noo noo, los yog paug.
Qhov tseem ceeb (Oil-impregnated ntawv rwb thaiv tsev ntawm 20 degree):
|
tanδ (%) |
Qhov xwm txheej |
Txhais lus |
|
< 0.3 |
Zoo heev |
Qhuav, huv rwb thaiv tsev |
|
0.3 – 0.5 |
Txais tau |
Kev laus me ntsis los yog noo noo |
|
0.5 – 1.0 |
Marginal |
Qhov tseem ceeb degradation |
|
> 1.0 |
pluag |
Yuav tsum tau tshawb nrhiav tam sim ntawd |
Dab tsi siab tanδ tuaj yeem nthuav tawm:
• Cov dej noo nkag mus rau hauv daim ntawv rwb thaiv tsev lossis roj
• Carbonization los ntawm ib feem ntawm kev ua haujlwm tawm
• Roj paug (sludge, yaj cov khoom lwj)
• Tag nrho cov rwb thaiv tsev laus dhau lub neej kev pab
Pom zoo Standards:IEC 60247 (roj), IEC 60422 (roj phau ntawv qhia), IEEE C57.152 (bushings).