Thaum lub sij hawm xeem, kuv pom ib tug loj spark thiab relay tripped. Puas yog flashover lossis tawg - thiab kuv yuav qhia qhov txawv li cas?
Distinguishing flashover (sab nraud nto tawm) los ntawm kev puas tsuaj (internal puncture) yog ib qho tseem ceeb heev vim hais tias cov kev kho yog txawv kiag li.
Cov ntsiab lus (IEC 60060-1):
• Flashover: Tshem tawm thoob plaws SURFACE ntawm ib qho insulator (sab nraud - rwb thaiv tsev yuav zoo lawm).
• Kev tawg / Puncture: Tshem tawm los ntawm cov khoom siv los yog kua rwb thaiv tsev (sab hauv - kev puas tsuaj mus tas li).
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Kev soj ntsuam |
Flashover (External) |
Kev tawg (Internal) |
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Pom kev tso tawm |
Nrog lub bushing nto los yog huab cua sib txawv |
Los ntawm rwb thaiv tsev - tej zaum yuav tsis pom |
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Suab |
Suab nrov, ntse "crack" (air ionization) |
Duller "thump" (los ntawm roj / ntawv) |
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Arc qhov chaw |
Pom tau nruab nrab ntawm lub davhlau ya nyob twg thiab hauv av |
Sab hauv; tsis pom txoj kev nto |
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Tshaj tawm -test IR |
Normal (cov rwb thaiv tsev tsis zoo) |
Poob tseem ceeb (compromised) |
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Ncej -test Tanδ |
Ib txwm los yog siab me ntsis |
Ua kom nce ntxiv |
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Tom qab -test DGA |
Tsis hloov |
C₂H₂, H₂ yog puncture arcs los ntawm roj |
tsob ntoo txiav txim:
1. Puas yog txoj kev tso tawm pom ntawm qhov chaw?
→ YOG=flashover → huv, qhuav, rov-test.
→ TSIS MUAJ=tuaj yeem yog sab hauv. Ntsuas IR → yog tias qis=tawg.
2. Puas yog tso tawm rov ua dua ntawm tib qhov hluav taws xob?
→ YOG=kev puas tsuaj sab hauv (yuav rov ua dua).
→ TSIS MUAJ=random nto flashover (pab paug).
Txoj cai tseem ceeb:
• Flashover yog qhov kev sim teeb tsa tsis ua haujlwm, tsis yog khoom siv tsis ua haujlwm.
• Kev puas tsuaj sab hauv IS cov cuab yeej tsis ua haujlwm - kho lossis hloov.
• Ib txwm sau ntawv: voltage ntawm paug, huab cua tej yam kev mob, nto paug.