Q: Kuv hnov txog "Duval Daim duab peb sab" ntau hauv DGA txhais lus. Nws ua haujlwm li cas?
A: Lub Duval Daim duab peb sab (los ntawm Michel Duval, IREQ, tam sim no IEEE C57.104) yog txoj kev siv ntau tshaj plaws rau DGA kev faib ua txhaum cai siv daim duab ternary.
Peb qhov sib piv ntawm cov roj (Triangle 1 - cov roj ntxhia):
• %CH₄=CH₄ / (CH₄ + C₂H₄ + C₂H₂) × 100
• %C₂H₄=C₂H₄ / (CH₄ + C₂H₄ + C₂H₂) × 100
• %C₂H₂=C₂H₂ / (CH₄ + C₂H₄ + C₂H₂) × 100
|
Zone |
Hom txhaum |
Kev piav qhia |
|
PD |
Kev tso tawm ib nrab |
Tsawg-zog corona, ua rau tsis muaj zog |
|
D1 |
Tsawg- zog tawm |
Sparking, taug qab (glow paug) |
|
D2 |
Siab -Neeg tawm |
Arcing nrog lub zog ua raws -los ntawm |
|
T1 |
Thermal <300 degree |
Overheated rwb thaiv tsev (winding los yog core) |
|
T2 |
Thermal 300℃-700 degree |
Qhov chaw kub, qhov hluav taws xob tsis zoo |
|
T3 |
Thermal> 700 degree |
Qhov chaw kub kub, ua tau arcing + thermal |
|
DT |
Mixed Thermal + Tawm |
Combination txhaum |
Piv txwv kev kuaj mob:
150 MVA transformer: CH₄=180 ppm, C₂H₄=280 ppm, C₂H₂=5 ppm
%CH₄=38.7%, %C₂H₄=60.2%, %C₂H₂=1.1%
→ Poob T2 tsam → thermal txhaum 300-700℃.
Siab C₂H₄ + qis C₂H₂ → tej zaum yuav muaj kev sib txuas tsis zoo lossis coj mus rhaub- hloov kev sib cuag.
Kev nqis tes ua: Tshawb xyuas kais - hloov chaw hu. Teem sijhawm hluav taws xob yog C₂H₄ tseem nce ntxiv.
Lwm cov Duval Triangles:
|
Daim duab peb sab |
Daim ntawv thov |
Qhov txawv tseem ceeb |
|
Daim duab peb sab 1 |
Mineral roj transformers (tus qauv) |
CH₄, C₂H₄, C₂H₂ |
|
Daim duab peb sab 2 |
Thermal txhaum zone refinement |
CH₄, C₂H₄, C₂H₆ |
|
Daim duab peb sab 3 |
Tsawg-kub thermal faults |
C₂H₄, C₂H₆, CH₄ |
|
Daim duab peb sab 4 |
Load Tap Changers (LTCs) |
Tib gases, txawv ib cheeb tsam |
|
Daim duab peb sab 5 |
Natural ester (cov roj zaub) |
Kho ciam teb rau cov roj ester |
Kev txwv:
• Yuav tsum muaj tsawg kawg yog peb cov pa roj carbon monoxide siab tshaj qhov txwv tsis pub kuaj pom.
• Tsawg dua kev ntseeg siab thaum ib qho roj> 80% ntawm tag nrho HC.
• Tsis tuaj yeem paub qhov txawv ntawm ntau hom kev ua txhaum ib txhij.
• Ib txwm siv nrog cov nqi roj (ppm/hnub lossis ppm/hli).