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TRANSFORMER OIL RELATED ASPECTS

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TRANSFORMER OIL RELATED ASPECTS OIL PLANT CAPACITY 60KL/Day(Now we are enhancing to 120KL/Day from existing 60KL capacity) A) TOBS storage capacity-1000KL – PowerPoint PPT presentation

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Title: TRANSFORMER OIL RELATED ASPECTS


1
TRANSFORMER OIL RELATED ASPECTS
  • OIL PLANT CAPACITY 60KL/Day(Now we are
    enhancing to 120KL/Day from existing 60KL
    capacity) A) TOBS storage capacity-1000KL (600KL
    tank-1no,100KL tanks-4nos) B) In process Oil
    storage capacity-125KL(20KL filters-3nos,10KL
    filters-6nos and 5KL filter-1no) C) Finished Oil
    storage capacity-390KL(240KL tank-1no,100KLtank-1n
    o and 25KLtanks-2nos.

2
FUNCTIONS OF TRANSFORMER OIL
  • To provide dielectric strength of the transformer
    insulation system.
  • To provide efficient cooling.
  • To protect the transformer core and coil assembly
    from chemical attack.
  • To prevent the build up of sludge in the
    transformer.

3
PRODUCTION OF TRANSFORMER OIL
  • Transformer oil is hydrocarbon product,mainly
    oil contains napthanic,parrafinic and aromatics.
  • To obtain the TOBS the crude oil which is burried
    from earth crust subjected in to the following
    sequence of operations .
  • Distillation-Acid treatment-Neutralization-Water
    wash-Hot air blowing.
  • Clay treatment process on TOBS will give us the
    finished transformer oil.
  • After the hot filtration operation transformer
    oil is ready for filling the transformers.

4
DETORIORATION ASPECTS OF TRANSFORMER OIL
  • Deterioration due to the accidental leakage of
    water .
  • Deterioration due to the chemical decomposition.
  • Deterioration due to the oxidation.
  • Deterioration due to the contamination by gases.
  • Deterioration due to the electrical stresses.
  • Deterioration due to the thermal stresses.
  • Deterioration due to the effect of oxidation
    products.
  • Deterioration due to the physical contamination.

5
PRECAUTIONS INVOLVED IN
TRANSFORMER OIL SAMPLING.
  • The utmost care should be taken to avoid
    contamination of samples with external impurities
    such as dust and moisture.
  • Attention is drawn to the danger of sampling in
    rainy or foggy weather.
  • The hands of the sampler should not come into
    contact with the samples.
  • Care should be taken when sampling oil colder
    than the surrounding air, to avoid contamination
    by condensation.

6
PRECAUTIONS INVOLVED IN
TRANSFORMER OIL SAMPLING.
  • Only glass sample containers,preferably fitted
    with ground glass stopper,should be used.
  • Cotton waste or other fibrous materials should
    not be used to wipe the containers or apparatus.
  • Where practicable,if a bottom sample is required
    the contents of the tank or package,after
    movement,should be allowed for at least
    8Hrs,preferably 24Hrs before sampling.
  • Before the actual sample is taken,the entire
    sampling apparatus and containers should be
    rinsed with the oil,which should then discarded

7
PRECAUTIONS INVOLVED IN
TRANSFORMER OIL SAMPLING.
  • To remove any moisture or dirt on the surfaces
    over which the oil sample will flow a small
    amount of oil should be allowed to flow from the
    tank or package and run to waste before the
    sample is taken.
  • Samples that are to be tested for
    sludge,corrosive sulphur or tan delta should be
    protected from light.

8
TRANSFORMER OIL
  • Specifications for Testing of transformer oil.
  • IS-335
  • ASTM-D3487
  • IEC-60296
  • BS-148
  • JIS-2320

9
IS-335SPECIFICATION
  • APPEARANCEClear transparent and free from
    suspended matter and or sediments.
  • DENSITYIS-1448 P(16) HYDROMETER/THERMOMETER
    DESIGN VALUE0.89 gms/ml _at_29.5C max
  • KINEMATIC VISCOCITYIS-1448 P(25) CONSTANT
    TEMPERATURE BATH THERMOMETERS/STOP WATCH
    DESIGN VALUE27cSt _at_ 27 C max

10
IS-335SPECIFICATION
  • INTERFACIAL TENSIONIS-6104 INTERFACIAL TENSIO
    METER DESIGN VALUE0.04N/M max
  • FLASH POINTIS-1448 P(21) PENSKY
    MARTINS CLOSED CUP FLASH POINT TESTER/THERMOMETERS
    . DESIGN VALUE140 C min
  • POUR POINTIS-1448 P(10) CLOUD
    POINTPOUR POINT APPARATUS/THERMOMETERS
    DESIGN VALUE-- -6 C max

11
IS-335SPECIFICATION
  • NEUTRALIZATION VALUEIS-1448 P(2)
    CONICALFLASKS/BURETTES/MEASURING
    CYLINDERS/BURETTE STANDS/ VOLUMETRIC FLASKS
    DESIGN VALUES--
    A. TOTAL ACIDITY
    0.03mgKOH/gm B. INORGANIC ACIDITY NIL
  • ELECTRIC STRENGTH(BDV) IS-6792 BDV TEST SET
    DESIGN
    VALUES
    A. UN FILTERD 30kv min
    B. FILTERD 60kv min

12
IS-335SPECIFICATION
  • DIELECTRIC DISSIPATION FACTOR (TAN DELTA)IS-6262
    TANDELTA TEST
    SET/OIL CELL HEATER/OIL CELL.
    DESIGN VALUE 0.002 max
  • RESISTIVITY IS-6013 RESISTIVITY
    TEST SET/OIL CELL HEATER /OIL CELL
    DESIGN VALUES
    A.
    150010E12 Ohm-cm _at_27 C min
  • B. 3510E12 Ohm-cm _at_90 C min

13
IS-335SPECIFICATION
  • PRESENCE OF ANTI OXIDATIVE INHIBITOR IS13631
  • MEASURING CYLINDERS/PIPPETES/
    BURETTES/BURETTE STANDS
  • DESIGN VALUE NOT DETCTABLE
  • WATER CONTENT IS-13567
  • AUTO MATIC KARLE FISHER TITRATOR/WEIGHING
    BALANCE DESIGN VALUE 50PPM max

14
IS-335SPECIFICATION
  • CORROSIVE SULPHUR IS-335 ANNEX-B TEMPERATURE
    CONTROLLED OVEN/CONOCAL FLASKS/FORECEPS
  • DESIGN VALUE NON CORROSIVE
  • OXIDATION STABILITY IS-335 ANNEX-C OXIDATION
    STABILITY BLOCK/ VACUUM
    PUMP/OXIDATION TUBES/G-4 FILTERS/BURETTES/BURETTE
    STANDS/ CONICAL FLASKS/WEIGHING BALANCE.
    DESIGN VALUES
    A.NEUTRALIZATION VALUE0.4mgKOH/gm
  • B. SLUDGE BY MASS 0.1max

15
IS-335 SPECIFICATION
  • AGEING CHARACTERISTICS IS-12177
  • AGEING OVEN /WEIGHING BALANCE/
    VACCUME PUMP/ G-4 FILTERS/ BURETTES/BURETTE
    STANDS/ CONICAL FLASKS.
  • DESIGN VALUES
  • A.RESISTIVITY_at_27DegC-2.5Ohm-cm min
    B.RESISTIVITY_at_90DegC-0.2Ohm-cm min
    C.TANDELTA_at_90DegC-0.2 max
  • D.TOTAL ACIDITY -0.05mgKOH/gm
  • E. TOTAL SLUDGE 0.05

16
NABL RECUREMENTS IN OIL LAB
  • Equipment history cards
  • Measurement uncertainty calculations.
  • Regular calibrations of instruments from NABL
    accredited laboratories.
  • Interlab comparison
    Replicate testing

17
APPEARANCE TEST
  • APPEARANCE
  • Measurement uncertainty calculation for
    transformer oil appearance test
  • Sources of uncertainty
  • a) Improper sampling
  • b) Presence of sediments and suspended matter
    in
  • the bottles used for sampling
  • c) Persons skills

18
APPEARANCE TEST
  • a) Improper sampling
  • To avoid the uncertainty due to
    improper
  • sampling the following care should be taken
  • 1) Dont use the cotton waste while sampling
  • 2) Dont pickup the sampling in dust and foggy
  • weather
  • 3) Clean the sampling point (pipe end) before
  • sampling

19
APPEARANCE TEST
  • b) Presence of sediments and suspended matter in
  • the bottles used for sampling
  • The test results may be effect due to the
    contamination of sediments and suspended matter,
    if any present in the sampling bottles. Bottles
    should be thoroughly clean before sampling by
    using the following cleaning agents as per the
    sequence
  • 1) Tap water 2) Soap solution 3) Tap water 4)
    Hot distilled water 5) Acetone and allow for oven
    drying at 110C for 1hr. And then vacuum with the
    vacuum pump.

20
APPEARANCE TEST
  • Persons skills Person skills may
    also be the one of the reason for effecting the
    test results. To avoid this problem . The
    following persons will take care in the bottles
    cleaning and reporting the results
  • 01) P.SRINIVAS RAO

21
BRAKE DOWN VOLTAGE TEST
  • Measurement uncertainty calculation for BDV test
    on transformer oil
  • Sources of uncertainty 1) Test results
    obtained 2) BDV test set resolution
    3) BDV test set calibration 4) Atmospheric
    condition

22
BRAKE DOWN VOLTAGE TEST
  • Results obtained . Repeated measurements on
    sample transformer oil sample a) (
    68,74,72,60,68,64) 67.6kv b)
    (66,72,80,64,68,62) 68.6kv c)
    (68,70,70,68,80,76) 72.0kv d)
    (72,62,76,68,82,68) 71.3kv e)
    (64,66,78,72,68,70) 69.6kv
  • Average value 69.82kv
  • St. Deviation ?(-2.22)2(-1.22)2(2.18)2(1.48)2
    (-0.22)2 / 4 ?
    (4.92841.48844.75242.19040.0484) / 4
  • 1.8308
  • Type A uncertainty 0.818kv

23
BRAKE DOWN VOLTAGE TEST
  • 2)BDV test set resolution (B1)uncertainty
    due to BDV test set resolution 2 / 2 ?3
    0.577kv
  • 3) BDV test set calibration
    (B2)uncertainty due to BDV test set
    calibration. 1.9 / 2
    0.95kv Type B uncertainty ?(B1)2(B2)2

    ?(0.572)2(0.95)2
    1.1115kv combined uncertainty
    ?(Type A)2(Type B)2

24
BRAKE DOWN VOLTAGE TEST
  • combined uncertainty ?(Type A)2(Type B)2
  • ? (0.818)2 1.1115)2
  • 1.38kv
  • Note 4
  • Room temperature and relative
    Humidity maintained at 27C and 44 RH
    respectively so uncertainty due to Atmospheric
    Conditions is not Considered
  • Expended uncertainty 2 x 1.38 2.76kv
  • At 95 confidence level with respeet to 69.82kv
  • 69.82 2.76

25
INTERLAB COMPARISION
  • Brake down voltage Inter lab comparison
  • 1) PGCL values 73.1kv
  • Vijai electrical value 69.3kv
  • Difference 3.8kv
  • Uncertainty 3.01kv
  • Z Difference / uncertainty 3.8 / 3.01
    1.26
  • Z Value is less than 2 OK

26
INTERLAB COMPARISION
  • ERDA VALUE 64.0kv
  • Vijai electrical value 69.3kv
  • Difference 5.3kv
  • Uncertainty 3.01kv
  • Z Difference / uncertainty 5.3 / 3.01
    1.76
  • Z Value is less than 2 OK

27
INTERLAB COMPARISION
  • CPRI VALUE 87.0kv
  • Vijai electrical value 69.3kv
  • Difference 17.7kv
  • Uncertainty 3.01kv
  • Z Difference / uncertainty 17.7 / 3.01
    5.88
  • Z Value is higher than 2 (Not OK)
  • The value of BDV reported By CPRI Bangolure
    appears to be very high . Requested CPRI to
    examine the same
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