Investigations of Temperature Effects on the Dielectric Response Measurements of Transformer Oil-Paper Insulation System

Saha, Tapan Kumar; Purkait, P.

doi:10.1109/tpwrd.2007.911123

Cited by 181 publications

(123 citation statements)

References 16 publications

Supporting

Mentioning

121

Contrasting

Order By: Relevance

“…Over the last few years, the demand to non-destructively and reliably obtain the transformer insulation condition has greatly accelerated the improvement of DRM techniques, such as Return Voltage Measurement (RVM) [14,15], Polarization and Depolarization Current (PDC) [16][17][18], and Frequency Domain Spectroscopy (FDS) [19][20][21]. The transformer insulation system contains insulation oil and cellulose material, and its dielectric properties are strongly affected by the test temperature, ageing and moisture.…”

Section: Introductionmentioning

confidence: 99%

Study on Quantitative Correlations between the Ageing Condition of Transformer Cellulose Insulation and the Large Time Constant Obtained from the Extended Debye Model

et al. 2017

View full text Add to dashboard Cite

Polarization-depolarization current (PDC) measurements are now being used as a diagnosis tool to predict the ageing condition of transformer oil-paper insulation. Unfortunately, it is somewhat difficult to obtain the ageing condition of transformer cellulose insulation using the PDC technique due to the variation in transformer insulation geometry. In this literature, to quantify the ageing condition of transformer cellulose insulation using the PDC technique, we firstly designed a series of experiments under controlled laboratory conditions, and then obtained the branch parameters of an extended Debye model using the technique of curve fitting the PDC data. Finally, the ageing effect and water effect on the parameters of large time constant branches were systematically investigated. In the present paper, it is observed that there is a good exponential correlation between large time constants and degree of polymerization (DP). Therefore, the authors believe that the large time constants may be regard as a sensitive ageing indicator and the nice correlations might be utilized for the quantitative assessment of ageing condition in transformer cellulose insulation in the future due to the geometry independence of large time constants. In addition, it is found that the water in cellulose pressboards has a predominant effect on large time constants.

show abstract

Section: Introductionmentioning

confidence: 99%

Study on Quantitative Correlations between the Ageing Condition of Transformer Cellulose Insulation and the Large Time Constant Obtained from the Extended Debye Model

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The frequency response of the dielectric materials is being widely used as a diagnostic tool for insulation systems [4][5][6][7]. The monitoring of the complex permittivity and the dissipation factor of transformer insulation, as function of frequency provides inside information concerning the state of insulation within the components.…”

Section: Background On Frequency Domain Spectroscopymentioning

confidence: 99%

“…As the equipment ages, its internal insulation degrades, thus increasing the risk of failure. Insulation degradation/aging is consequently recognized to be one of the major causes of transformer breakdown [2][3][4][5][6][7]. Indeed, when electrical equipments fail, the fault can generally be traced to defective insulation [8].…”

Section: Introductionmentioning

confidence: 99%

“…The FDS is the favoured choice for on-site measurements due to its robustness against noise. In the last decades, much study and work has been performed with the aim of improving our basic understanding of dielectric response interpretation schemes (e.g., [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]). It is now accepted that Frequency Domain Spectroscopy (FDS) measurement techniques provide indication of the general ageing status and moisture content of the oil-paper insulation of transformer.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

On the Feasibility of Using Poles Computed from Frequency Domain Spectroscopy to Assess Oil Impregnated Paper Insulation Conditions

et al. 2013

View full text Add to dashboard Cite

Frequency Domain Spectroscopy (FDS) is an effective tool allowing assessing the condition of oil-paper insulation system in power equipment. However, results from these measurements are known to be greatly influenced by various parameters, including insulation aging, moisture content, and insulation geometry/volume, together with environmental condition such as temperature. In this contribution, a series of experiments have been performed under controlled laboratory conditions. The dielectric response of the oil impregnated paper, along with the degree of polymerization and moisture content, were monitored. Since dielectric parameters are geometry dependent, poles (independent of the geometry) which depends on resistivity and permittivity, were considered to assess the condition of the insulation. From the investigations performed on new and aged samples, it is shown that poles (P) can be regarded as insulation aging indicator. It is also shown that a per unit value based on the Dielectric Dissipation Factor (DDF), measured in the frequency range from 1 to 1000 Hz can be correlated to moisture content in the insulation paper.

show abstract

“…Therefore, in aging studies it is usual to consider the aging effects caused by the HST. The variation of power transformer loading beyond nameplate rating in both normal and emergency cases increases temperature inside the transformer tank and may causes the rapid thermal deterioration of the insulation [7]. This is a cause of transformer failure.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Transformer Insulation Life with an Effect of Environmental Variables

Murugesan¹,

Krishnan²

2012

IJCA

View full text Add to dashboard Cite

The Hot Spot Temperature (HST) value depends on the ambient temperature, the rise in the top oil temperature (TOT) over the ambient temperature, and the rise in the winding HST over the top oil temperature. In this paper a new semi-physical model comprising of the environmental variables for the estimation of HST and loss of insulation life in transformer is proposed. The winding hot-spot temperature can be calculated as a function of the top-oil temperature that can be estimated using the transformer loading data, top oil temperature lagged regressor value, ambient temperature, wind velocity and solar heat radiation effect. The estimated HST is compared with measured data of a power transformer in operation. The proposed model has been validated using real data gathered from a 100 MVA power transformer. General TermsPower Transformer, Ambient Temperature.

show abstract

Investigations of Temperature Effects on the Dielectric Response Measurements of Transformer Oil-Paper Insulation System

Cited by 181 publications

References 16 publications

Study on Quantitative Correlations between the Ageing Condition of Transformer Cellulose Insulation and the Large Time Constant Obtained from the Extended Debye Model

Study on Quantitative Correlations between the Ageing Condition of Transformer Cellulose Insulation and the Large Time Constant Obtained from the Extended Debye Model

On the Feasibility of Using Poles Computed from Frequency Domain Spectroscopy to Assess Oil Impregnated Paper Insulation Conditions

Prediction of Transformer Insulation Life with an Effect of Environmental Variables

Contact Info

Product

Resources

About