Dielectric spectroscopy techniques as quality control tool: a feasibility study

Bouaicha, A.; Fofana, I.; Farzaneh, M.; Setayeshmehr, A.; Borsi, H.; Gockenbach, E.; Béroual, Abderrahmane; Aka, N.T.

doi:10.1109/mei.2009.4795464

Cited by 54 publications

(39 citation statements)

References 12 publications

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“…The capacitor core of condenser bushing is a conductive rod wound by multi-layer insulation paper and aluminum foils [9]. The construction of capacitor core is shown in Figure 1.…”

Section: Test Samplementioning

confidence: 99%

“…At present, dielectric spectroscopy in time or frequency domain offers new opportunities for an off-line, insulation condition assessment of high voltage (HV) electric power equipment and its predictive maintenance nondestructively and reliably in the field [8][9][10][11]. Dielectric spectroscopy techniques in time and frequency domain can be applied to monitor the condition of oil-impregnated paper condenser bushings [9].…”

Section: Introductionmentioning

confidence: 99%

“…Dielectric spectroscopy techniques in time and frequency domain can be applied to monitor the condition of oil-impregnated paper condenser bushings [9]. The results researched by Issouf Fofana et al indicate that capacitance ratio and direct current conductivity deduced from the spectroscopic measurements can be used to accurately monitor insulation condition, and both parameters were found to increase with moisture or aging duration [8].…”

Section: Introductionmentioning

confidence: 99%

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Study of the Impact of Initial Moisture Content in Oil Impregnated Insulation Paper on Thermal Aging Rate of Condenser Bushing

et al. 2015

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This paper studied the impact of moisture on the correlated characteristics of the condenser bushings oil-paper insulation system. The oil-impregnated paper samples underwent accelerated thermal aging at 130˝C after preparation at different initial moisture contents (1%, 3%, 5% and 7%). All the samples were extracted periodically for the measurement of the moisture content, the degree of polymerization (DP) and frequency domain dielectric spectroscopy (FDS). Next, the measurement results of samples were compared to the related research results of transformer oil-paper insulation, offering a theoretical basis of the parameter analysis. The obtained results show that the moisture fluctuation amplitude can reflect the different initial moisture contents of insulating paper and the mass ratio of oil and paper has little impact on the moisture content fluctuation pattern in oil-paper but has a great impact on moisture fluctuation amplitude; reduction of DP presents an accelerating trend with the increase of initial moisture content, and the aging rate of test samples is higher under low moisture content but lower under high moisture content compared to the insulation paper in transformers. Two obvious "deceleration zones" appeared in the dielectric spectrum with the decrease of frequency, and not only does the integral value of dielectric dissipation factor (tan δ) reflect the aging degree, but it reflects the moisture content in solid insulation. These types of research in this paper can be applied to evaluate the condition of humidified insulation and the aging state of solid insulation for condenser bushings.

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“…The capacitor core of condenser bushing is a conductive rod wound by multi-layer insulation paper and aluminum foils [9]. The construction of capacitor core is shown in Figure 1.…”

Section: Test Samplementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study of the Impact of Initial Moisture Content in Oil Impregnated Insulation Paper on Thermal Aging Rate of Condenser Bushing

et al. 2015

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“…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%

“…Over the last decades, the increasing requirements for appropriate tools to diagnose power equipments insulation non-destructively and reliably in the field drive the development of diagnostic tools based on changes of the dielectric properties of the insulation. Among these tools time domain measurement based on Polarization/Depolarization Current (PDC) and Frequency Domain Spectroscopic (FDS) measurements are gaining exceptional importance to the utility professionals [7][8][9][10][11][12][13][14][15]. The FDS is the favoured choice for on-site measurements due to its robustness against noise.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2013

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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.

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Characterization of aging transformer oil-pressboard insulation using some modern diagnostic techniques

Fofana

Bouaicha

Farzaneh

2010

Euro. Trans. Electr. Power

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SUMMARYThis paper presents a study on the characterization of aging of transformer oil-pressboard insulation. Traditional and modern diagnostic tools and techniques were used to investigate aging of oil-paper insulation under controlled laboratory conditions. Insulation condition testing includes common chemical diagnostics such as acidity tests and new chemical techniques: determination of relative content of dissolved decay products by spectrophotometry, solid suspension by turbidimetry, Fourier Transform Infrared (FTIR) spectroscopy and electrical diagnostic techniques that have gained exceptional importance for utility professionals: polarisation/depolarisation current, recovery voltage measurement and frequency domain dielectric spectroscopy measurements. From the obtained results it is found that chemical tests depicted more sensitivity to insulation degradation. Also, different oil-pressboard insulation ratios were investigated to assess the influence of the relative amount of cellulosic materials on aged mineral oil decay products and vice versa. Emphasize is laid on the potentialities/avenues offered by FTIR to assess oil insulation condition. Notable experimental results have been reported, which could be valuable to researchers and practicing engineers in this field.

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Dielectric spectroscopy techniques as quality control tool: a feasibility study

Cited by 54 publications

References 12 publications

Study of the Impact of Initial Moisture Content in Oil Impregnated Insulation Paper on Thermal Aging Rate of Condenser Bushing

Study of the Impact of Initial Moisture Content in Oil Impregnated Insulation Paper on Thermal Aging Rate of Condenser Bushing

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

Characterization of aging transformer oil-pressboard insulation using some modern diagnostic techniques

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