THE CONDITION OF CAPACITOR VOLTAGE THE CONDITION OF CAPACITOR VOLTAGE TRANSFORMER USING TAN DELTA TRANSFORMER USING TAN DELTA

MEASUREMENTMEASUREMENT

Presenter Presenter DimasDimas BangunBangun FiddiansyahFiddiansyah, , SugiyonoSugiyono

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BACKGROUNDBACKGROUND

CVT Interruption due to insulation failureCVT Interruption due to insulation failureDegradation of Insulation can generally be Degradation of Insulation can generally be restored restored Tan delta measurement is method to Tan delta measurement is method to investigate insulation condition in CVTinvestigate insulation condition in CVT©Do

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CVT PARTSCVT PARTS

CVT CVD + EMU

Trench Electric

CVD consisted of Capacitor Stacks in series Connection©Do

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DEFINITIONDEFINITION……..

When tan delta values more increase, When tan delta values more increase, Dissipation power more increaseDissipation power more increase

V

I

δ Ø

DP = Ir2.R = V.I cos ØDP = V.ω.C. sinδ / cos ØDP = V2 . ω . C . Tan δ

IC

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POWER SYSTEM NETWORK OF POWER SYSTEM NETWORK OF LAMPUNG PROVINCELAMPUNG PROVINCE

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CVT POPULATION CVT POPULATION IN LAMPUNG PROVINCEIN LAMPUNG PROVINCE

8

15

6 6

35

26

36

21

56

63

6

20

35

0

10

20

30

40

50

60

Tarahan Kotabumi Tegineneng

BALTEAU

ABB

MAGRINIGALILEO

HAEFELYTRENCH

JUMLAHTOTAL

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TAN DELTA MEASUREMENTTAN DELTA MEASUREMENT

Measurement Method :Measurement Method :Ungrounded Specimen Test (UST)Ungrounded Specimen Test (UST)Grounded Specimen Test (GST)Grounded Specimen Test (GST)Grounded Specimen Test using guard Grounded Specimen Test using guard connection (connection (GSTgGSTg))

Output Parameters :Output Parameters :Capacitance (Total Charging Current)Dielectric LossPower Factor

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CVT TEST CONNECTIONCVT TEST CONNECTION

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INTERPRETATIONINTERPRETATION

IEC 60044IEC 60044--5 20045 2004--04 Capacitor Voltage 04 Capacitor Voltage Transformer : Rated capacitance Transformer : Rated capacitance --5% to +10%5% to +10%

Tan Tan δδ ≤≤ 5 x 105 x 10--33 at 20at 20ooCC

DobleDoble Test ProcedureTest ProcedureTan Tan δδ ≤≤ 5 x 105 x 10--3 for Oil/ Paper Construction3 for Oil/ Paper Construction

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TAN DELTA MEASUREMENT (1)TAN DELTA MEASUREMENT (1)

Tan δ : 5 x 10-3

Ctotal : 6200 (-5 ; +10) %

Tan δ : 5 x 10-3

Ctotal : 6200 (-5 ; +10) %

Tan δ : 5 x 10-3

Ctotal : 6200 (-5 ; +10) % Ph T. 7500–8250 PF

Tan δ : 5 x 10-3

Ctotal : 6200 (-5 ; +10) %

Tan δ : 5 x 10-3

Ctotal : 6200 (-5 ; +10) %

Interpretation

171717

171717

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Lifetime(Years)

CVT Replacement5,476,155,53

6114,357009,616629,23

RST

Baturaja(Ln. Bkmng)

Monitoring5,755,665,77

6266,726339,546289,79

RST

Kotabumi(ln. Tgnng 1)

CVT Replacement6,166,883,81

6592,196901,737638,39

RST

Tegineneng(Ln ktbmi 1)

CVT Replacement7,418,957,46

6988,066914,736620,50

RST

Teluk Betung(Ln Natar 1

Monitoring6,696,416,21

6194,056298,746207,58

RST

Tarahan(ln Sutami 1)

RecommendationTan delta(x 10-3)

Capacitance (pF)

PhaseSubstation

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TAN DELTA MEASUREMENT (2)TAN DELTA MEASUREMENT (2)

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Failure CVT FactorFailure CVT FactorTechnical LifetimeTechnical LifetimeOver voltagesOver voltagesHumidityHumidityHigh TemperatureHigh TemperatureMechanical FailureMechanical Failure©Do

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FAILURE IN CAPACITOR STACK OF FAILURE IN CAPACITOR STACK OF CVTCVT

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CVT REPLACEMENT WORKCVT REPLACEMENT WORK

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TAN DELTA MEASUREMENT TAN DELTA MEASUREMENT ANALYSISANALYSIS

Based on Interpretation stated that :Based on Interpretation stated that :High of Power Factor Values more than 1%, but High of Power Factor Values more than 1%, but Capacitance values still covered in its range, Capacitance values still covered in its range, suggested to Retest in the next 6 month to get suggested to Retest in the next 6 month to get the trending datathe trending dataChanges of CVT Capacitance Values from its Changes of CVT Capacitance Values from its range criteria within range criteria within --5 % to +10% suggested to 5 % to +10% suggested to be Replaced. be Replaced.

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CVT monitoring using tan delta CVT monitoring using tan delta measurement is useful in keep sustainability measurement is useful in keep sustainability and reliability of power system network.and reliability of power system network.Failure of CVT Can be effected due to Failure of CVT Can be effected due to Dielectric Insulation FailureDielectric Insulation FailureOperational condition of CVT can be early Operational condition of CVT can be early detected both for normal and abnormal detected both for normal and abnormal conditioncondition

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It is important to test CVT Power It is important to test CVT Power Factor & Capacitances through tan Factor & Capacitances through tan delta measurement to get trendings delta measurement to get trendings analisys analisys CVT with Capacitance & tan delta CVT with Capacitance & tan delta values which out of its limit values which out of its limit suggested to be Replacedsuggested to be Replaced

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