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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

    [email protected]

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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.