Presentation Roizman Davydov Modified

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    Temperature Rise Tests

    Centre for Power Transformer Monitoring, Diagnostics

    and Life Management (transformerLIFE)

    Monash University, Australia

    Oleg RoizmanIntellPower, Australia

    Spring 2009 IEEE Transformers Committee Meeting

    Miami FL, 21 April 2009

    Valery DavydovMonash University

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    Special Test Transformer Nameplate Data

    Year of Manufacture 2006

    Rated Power HV/MV for ONAN,

    kVA

    468/468

    Rated Voltage HV/MV/LV, kV 22/4.5/0.415

    Rated Current HV/MV Amp 12.3/60.0

    Cooling Types ONAN, ONAF,

    OFAF

    Number of Phases 3

    Vector Symbol YNyn0yn0

    Mass Untanking, kg 2420

    Mass Each Cooler (excluding oil), kg 115

    Mass Total (including oil), kg 6850

    Insulating Oil Each Cooler, l 43

    Insulating Oil Total, litre 2650

    Oil Circulation, l/min 1200

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    Temperature Sensors and DAQ System

    16 Fiber Optic sensors

    24 Thermocouples, including magnetic and thermalribbon types

    9 RTDs, including those of moisture/temperature

    transmitters

    More than 60 channels of information stored at 1 min

    interval

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    Location of Thermocouples and RTDs

    in Test TransformerTop Oil Temperatures

    Top Core Yoke Temperatures

    Top Rings Temp

    Top Radiator

    Bottom Radiator

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    Location of Fibre Optic Probes and Core

    Thermocouples

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    Fibre Optic Probe Installation

    in MV Winding, Phase B

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    Fibre Optic Probe Installation in HV Winding

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    Effect of Measuring Instrumentation

    In the following 4 slides, comparisons are made for

    the two windings of Phase B (OFAF)

    MV (layer type) HV (disc type)

    The comparisons are made for results obtained during

    the Temperature Rise Tests conducted at Monash

    using two different instrumentation sets for windingresistance measurement

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    Comparison of Tavr and FO for MV OFAFPhase B, 100A

    30

    35

    40

    45

    50

    55

    60

    65

    0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

    t, min

    T

    ,deg

    C

    FO12 MV top FO13 MV middle FO14 MV bottom wm(i) as measured w(i) as calculated

    Avr wnd. T

    Top wnd. temp

    Mid wnd. temp

    Bot wnd. T

    1st set of winding resistance measurement instrumentation was used

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    Comparison of Tavr and FO for HV OFAFPhase B, 100A

    35

    37

    39

    41

    43

    45

    47

    49

    51

    0 2 4 6 8 10 12 14 16

    t, min

    T,

    deg

    C

    FO7 HV top FO9 HV middle FO11 HV bottom

    Measured average winding temperature Calculated average winding temperature

    Tawr

    1st set of winding resistance measurement instrumentation was used

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    OFAF (100A) HV Phase B

    60

    65

    70

    75

    80

    85

    90

    0:00:00 0:02:53 0:05:46 0:08:38 0:11:31 0:14:24 0:17:17 0:20:10 0:23:02

    Twarm Twarm fitted IEC 20mins Twarm fitted IEC 15mins Twarm fitted IEC 5mins

    Twarm fitted exp 5mins FO7 FO1 FO9

    2nd set of winding resistance measurement instrumentation was used

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    OFAF(100 A) MV Phase B

    60

    70

    80

    90

    100

    110

    120

    0:00:00 0:02:53 0:05:46 0:08:38 0:11:31 0:14:24 0:17:17 0:20:10 0:23:02Time since shu t down (mins)

    T,

    degC

    Twarm Twarm fitted IEC 20mins Twarm fitted IEC 15mins Twarm fitted IEC 5mins

    Twarm fitted exp 5mins FO13 FO12 FO14

    It could be seen that depending on duration of test variations in Twnd (R) is ~10 C

    2nd set of winding resistance measurement instrumentation was used

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    Blocked Coolers: 60A

    70

    72

    74

    76

    78

    80

    82

    84

    86

    88

    90

    7:12 8:24 9:36 10:48 12:00 13:12 14:24 15:36 16:48 18:00 19:12

    T,

    degC

    FO6 FO15 FO16

    Blocked Coolers 60 A

    Phase A Phase C Phase B

    ~4 hours!

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    Blocked Coolers: 60 A

    Blocked Cooling

    68

    70

    72

    74

    76

    78

    80

    82

    84

    0:00 2:24 4:48 7:12 9:36 12:00 14:24 16:48 19:12 21:36

    T,

    degC

    Twarm A Twarm fitted IEC (A) Twarm C Twarm fitted IEC Twarm B Twarm fitted IEC (B)

    Ph A

    Ph C

    Ph B

    76.59+time*0.1618-4.331)exp(-time/*5.521=Tw

    2nd set of winding resistance measurement instrumentation was used

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    Blocked Coolers HV Phase B 60A

    45

    50

    55

    60

    65

    70

    75

    80

    85

    90

    0:00 2:24 4:48 7:12 9:36 12:00 14:24 16:48 19:12 21:36

    Time since shutdown (mins)

    T,

    degC

    Twarm FO7 FO9 FO11 (TV4+TV5)/2

    hottest measured temp mid measured temp

    bottom measured tempWinding temp by

    resistance

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    ONAN(60A) HV phase B

    45

    50

    55

    60

    65

    70

    0:00:00 0:02:53 0:05:46 0:08:38 0:11:31 0:14:24 0:17:17

    Time since shutdown (mins)

    T,

    degC

    Twarm Twarm fitted IEC 15mins Twarm fitted IEC 5mins Twarm fitted exp 5mins FO9 FO3 FO11

    2nd set of winding resistance measurement instrumentation was used

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    ONAN(60A) MV phase B

    40

    45

    50

    55

    60

    65

    70

    75

    0:00:00 0:02:53 0:05:46 0:08:38 0:11:31 0:14:24 0:17:17

    Time since shutdown (mins)

    T,degC

    Twarm Twarm fitted IEC 15mins Twarm fitted IEC 5mins Twarm fitted exp 5mins FO12 FO13 FO14

    2nd set of winding resistance measurement instrumentation was used

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    Comparison of FO Data for Phases A, B & C

    In the following slide a comparison is made for Phases A, B

    and C for the HV (disc type) winding for the OFAF cooling

    mode

    The comparison is made for the measurements obtained

    during the Temperature Rise Tests conducted at Monash for

    the FO probes installed in the 2nd top disc of Phases A, B & C

    The differences in the FO measurement results wereobserved due to the following reasons:

    Phase A is the most remote phase from the oil inlet pipe; the velocity

    of oil flow through the winding ducts of Phase A is the lowest

    Phase C is the closest phase to the oil inlet pipe; the velocity of oil flowthrough the winding ducts of Phase C is the highest

    Phase B is in the middle between the inlet pipe and Phase A

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    FO Sensors Data for Phases A, B and C

    OFAF (100A)

    55

    60

    65

    70

    75

    80

    85

    90

    95

    8:24 9:36 10:48 12:00 13:12 14:24 15:36 16:48 18:00

    Time, h:mm

    Temperatu

    re,

    degC

    FO6 FO15 FO16

    Phase A

    Phase B

    Phase C

    Cooling curves

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    Cooling Curves for A, B and C Phases,

    OFAF (100A), HV

    60

    65

    70

    75

    80

    85

    90

    0:00 2:24 4:48 7:12 9:36 12:00 14:24 16:48 19:12 21:36

    Time since shutdown, min

    Windingtempe

    rautrebyR,

    degC

    Phase B Phase C Phase A

    2nd set of winding resistance measurement instrumentation was used

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    Effect of first valid time point for MV in OFAF

    60

    65

    70

    75

    80

    85

    90

    0:00:00 0:02:53 0:05:46 0:08:38 0:11:31 0:14:24 0:17:17 0:20:10 0:23:02

    Time since shutdown (mins)

    T,

    deg

    C

    Twarm Twarm fitted IEC 20mins (from 1m45s) Twarm fitted IEC 20mins (from 4m)

    1:45 min

    4:00 min

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    Factors Affecting Winding Temperature Rise

    Winding resistance measuring equipment

    Ambient temperature determination Inadequate calculation of the average oil

    temperature (leads to wrong g factor)

    Accuracy of Load Loss measurement Assumed total loss as sum of NL + LL

    Effect of the Core temperature dynamics

    Cold resistance measurement errors Not reaching steady state before shutdown

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    Factors Affecting Winding Temperature Rise

    (contd)

    Connection circuit (two windings at a time) Time interval first and last data point resistance

    measurement

    Fitting curve method

    Ambient oil temperature consideration

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