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    DEMO

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    orjifrancisebube
    TCN operation report format

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    DEMO

    Uploaded by

    orjifrancisebube
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    TCN operation report format

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    TCN operation report format

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    5 views4 pages

    DEMO

    Uploaded by

    orjifrancisebube
    TCN operation report format

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    You are on page 1of 4

    2021 ANNUAL MAINTENANCE ON TRANSFORMER AT GEOLIS CABLE NKPOR

    ONITSHA.

    TRANSFORMER II (FACTORY) DATA


    1 Make OCREV[BROGLIANO VICENZA]ITALY
    2 Year of Manufacture 1999
    3 Serial No 61120
    4 Voltage Level 500KVA[33/0.415KV]
    5 Vector Group DYnll
    6 Percentage Impedance 3.4%

    Table 1.1: Insulation Resistance Test

    HV-G LV-G HV- OIL WINDING DATE OF


    (GΩ) (MΩ) LV TEMP. TEMP (ᵒc) MEASUREMENT
    (MΩ) (ᵒc)
    Red Ø 2400 1000 2700 37.2
    Yellow Ø 2300 1100 2700 37.4
    Blue Ø 2200 1060 2700 37.2
    Instrument used in carrying out the test is 5kV Digital Insulation Resistance Tester (Megger)
    MIT1020/2

    Table 1.2: RATIO TEST WITH POTENTIAL AT THE PRIMARY SIDE [33KV]
    ry 430v
    yb 432v
    br 433v
    rn 242v
    yn 241v
    bn 243v

    Table 1.3: WINDING RESISTANCE TEST


    RY 3.72 ohms
    YB 3.74 ohms
    BR 3.72 ohms

    ry 0.9
    yb 0.7
    br 0.8
    rn 0.8

    1
    yn 0.6
    bn 0.7

    Table 1.4: T/F Oil Test

    TEST KV
    First 56
    Second 60
    Third 60
    Fourth 60
    Fifth 58
    Sixth 60
    Average is 59.1KV PASS

    OBSERVATION
    1. No oil leakage
    2. The earth pit is WET, which is recommended
    3. The transformer sub-station is OK

    ITEM REPLACE/ADD:
    1. Silica gel

    RECOMMENDATION:

    We recommend that 400Amps CHANGEOVER SWITCH should be installed in between


    TRANSFORMER 1 AND 11, to increase the LIFESPAN of TRANSFORMER 11 since
    TRANSFORMER 1 carries no load for now.

    REMARKS:

    The transformer is FIT for service

    2
    TRANSFORMER 11[FACTORY]

    TRANSFORMER II (FACTORY) DATA


    1 Make OCREV[BROGLIANO VICENZA]ITALY
    2 Year of Manufacture 1999
    3 Serial No 60303
    4 Voltage Level 500KVA[33/0.415KV]
    5 Percentage Impedance 5.71%

    Table 1.1: Insulation Resistance Test

    HV-G LV-G HV- OIL WINDING DATE OF


    (GΩ) (MΩ) LV TEMP. TEMP (ᵒc) MEASUREMENT
    (MΩ) (ᵒc)
    Red Ø 604 302 560 37.2
    Yellow Ø 602 306 560 37.4
    Blue Ø 604 310 560 37.2
    Instrument used in carrying out the test is 5kV Digital Insulation Resistance Tester (Megger)
    MIT1020/2

    Table 1.2: RATIO TEST WITH POTENTIAL AT THE PRIMARY SIDE [33KV]
    ry 420v
    yb 422v
    br 420v
    rn 232v
    yn 236v
    bn 234v

    Table 1.3: WINDING RESISTANCE TEST


    RY 42.0 ohms
    YB 44.2 ohms
    BR 43.2 ohms

    ry 0.8
    yb 0.8
    br 0.7
    rn 0.8

    3
    yn 0.8
    bn 0.7

    Table 1.4: T/F Oil Test

    TEST KV
    First 60
    Second 59
    Third 60
    Fourth 60
    Fifth 60
    Sixth 60
    Average is 59.8KV PASS

    OBSERVATION
    4. No oil leakage
    5. The earth pit is WET, which is recommended
    6. The transformer sub-station is OK

    ITEM REPLACE/ADD:
    1. Silica gel

    REMARKS:

    The transformer is FIT for service

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