dga_presentation dga adikari
TRANSCRIPT
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TRANSFORMER OILS
Pemantauan dan interpretasi DGA
dalam pemeliharaan transformator
PT.ADIKARI WISESA INDONESIAJl. Pemuda No 61 Kav. 19 Jakarta Timur 13210
Telp : 021-47864302
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PENDAHULUAN
FUNGSI MINYAK TRAFO
- Insulasi
- Pendingin
- Peredam busur api
- Pelarut gasgas
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DGA
(Analisis Gas Terlarut)
- Suatu metoda uji untuk mengetahuigas terlarut dalam minyak trafo padatrafo yang sedang beroperasi.
- Sebagai alat untuk deteksi dini
- Memperkirakan kondisi operasi trafo
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TDCG
Total dissolved combustible gas Gas yang timbul pada operasional trafo
- H2, CH4, C2H2, C2H4, C2H6, CO
- CO2 (bukan combustible gas)Akibat dari degradasi isolasi minyak dan
isolasi kertas
Gas Kromatografi : alat untuk menguji
TDCG
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Diagnosa trafo menggunakan TDCG
Status TDCG (ppm) Indikasi
Kondisi 1 720 Operasi trafo memuaskan
Kondisi 2 7211920 TDCG normal, fault mungkinada. Resampling dan hitung
rate TDCG / hari
Kondisi 3 1.9214630 Dekomposisi tingkat tinggiisolasi minyak/ kertas, fault
mungkin ada. Resampling
dan hitung rate TDCG/ hari
Kondisi 4 > 4.630 Dekomposisi minyak/ kertasberlebihan. Kemungkinanakan terjadi Failure bila
meneruskan operasi trafo
Sumber : IEEE C-57-104-1991
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Action BasedSumber : IEEE C-57-104-1991
Kondisi
TDCGppm
Rateppm/day
Samplinginterval Action
1
< 720 < 1010 -30
> 30
Setiap tahun
3 bulanan
bulanan
- Kontinyu normal
operasi
- Hati-hati ,cek individu gas
2 721 -1920
< 10
10 -30
> 30
3 bulanan
bulanan
bulanan
-Hati-hati ,cek individugas
3 1921
4630
< 10
10 -30
> 30
bulanan
mingguan
mingguan
-Kondisi Extrim,
Cek individu gas,
hubungi pabrikan
4 > 4630 < 1010 -30
> 30
mingguan
harian
harian
-Kondisi Extrim,Cek individu
gas, hubungi pabrikan
- Pertimbangkan keluar dari sistem, hubungi pabrikan
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Dissolved Key Gas Concentration limit (ppm)
Sumber : IEEE C-57-104-1991
Kondisi
H2 CH4 C2H2 C2H4 C2H6 CO CO2 TDCG
1 100 120 35 50 65 350 2500 720
2 101-
700
121-
400
35
50
51-
100
66
100
351
570
2501-
4000
721 -
1920
3 701 -1800
4011000
5180
101150
101150
5711400
400110000
19214630
4 >1800 >1000 >80 >200 >150 >1400 >10000 >4630
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FAULT TYPES
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FAULT TYPES
Key Gases Possible Faults Possible Findings
H2, possible trace of CH4andC2H6. Possible CO.
Partial discharges (corona) Weakened insulation from agingand electrical stress.
H2, CH4, (some CO if discharges
Involve paper insulation).
Possible trace amounts of C2H6.
Low energy discharges
(sparking).
(May be static discharges)
Pinhole punctures in paper Insulation with
carbon and carbon tracking. Possible carbon
particles in oil. Possible loose shield, poor
grounding of metal objects
H2, CH4, C2H6, C2H4, and the key gas for
arcing C2H2will be present perhaps in largeamounts. If C2H2is being generated, arcing
is still going on. CO will be present if paper is
being heated.
High energy discharges
(arcing)
Metal fusion, (poor contacts in tap changer
or lead connections). Weakened insulation,from aging and electrical stress. Carbonized
oil. Paper destruction if it is in the arc pathor
overheated.
H2, CO. Thermal fault less than 300C
in an area close to paper
insulation (paper is being
heated).
Discoloration of paper insulation.
Overloading and or cooling problem. Bad
connection in leads or tapchanger. Straycurrent path and/or stray magnetic flux.
H2, CO, CH4, C2H6, C2H4. Thermal fault between
300 C and 700 C
Paper insulation destroyed. Oil
heavily carbonized.
All the above gases and
acetylene in large amounts.
High energy electrical
arcing700 C and above.
Same as above with metal
discoloration. Arcing may havecaused a thermal fault.
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Sampling DGA
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Example of a Reclamation
transformer DGA:
Example 1Hydrogen (H2) 9 ppm
Methane (CH4) 60
Ethane (C2H6) 53
Ethylene (C2H4) 368
Acetylene (C2H2) 3
Carbon Monoxide (CO) 7
Carbon Dioxide (CO2) 361
Nitrogen (N2) 86,027
Oxygen (O2) 1,177
TDCG 500
Rogers Ratio Analysis
Code
C2H2/C2H4 = 3/368 = 0.00815 0
CH4/H2 = 60/9 = 6.7 2
C2H4/C2H6 = 368/53 = 6.9 2
This code combination is Case 8 in
table 4, which indicates thistransformer has a
thermal fault hotter than 700 C.
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Sampling DGA
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Power supply
RS-232 Cable
Laptop computer (optional)
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Gett ing an oi l samp le from the f ield:
Syringe must be filled so that
metering pin is completely
outside of syringe cap.