Experimental Investigation Using Accelerated Aging Factors on Dielectric Properties of Transformer Insulating Oil

Singh, Jashandeep; Sood, Yog Raj; Verma, Pradeep

doi:10.1080/15325008.2011.559185

Cited by 25 publications

(11 citation statements)

References 7 publications

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“…The resistivity of oil reduces considerably due to the presence of moisture, acidity, solid contaminants and so on. High resistivity reflects low content of free charge carriers and ion‐forming particles and indicates a low concentration of conductive contaminants [23].…”

Section: Resultsmentioning

confidence: 99%

“…The ageing and the oil oxidation also increase the values [22]. The dielectric loss factor can be used to monitor the quality of this oil, with regard to in-service deterioration and for the presence of contaminants [23]. With an increase in the population of free radicals, their unpaired electron can be coupled with a free electron to become charge carrier that tends to increase in turn the dissipation factor of the fluid [24].…”

Section: Dielectric Dissipation Factor (Tan δ)mentioning

confidence: 99%

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Comparative study of the degradation rate of new and regenerated mineral oils following electrical stress

Oumert

Boucherit

Zafour

et al. 2018

IET Generation, Transmission & Distribution

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The objective of this contribution was to study the behaviour of new and regenerated insulating oil used in power transformers under the influence of an electric stress. To estimate the degradation rate of the dielectric fluids, one thousand (1000) successive breakdowns were generated according to the IEC 60156 standard. The parameters such as dissipation factor (Tan ), resistivity, total acid number (TAN) and oil water Content were measured and examined following IEC/ISO standards. Good correlations have been obtained between TAN/resistivity and Tan  which might provide a "picture" of the fluid condition. The dissolved oxidation products for the two dielectric fluids (after the application of electric breakdowns), was evaluated by infrared spectroscopy (FT-IR). The results obtained indicate that the degradation of the parameters is significant and confirms the influence of an alternative electric field (AC) on the new and regenerated oils. It was also suspected that inhibitors and antioxidants were removed from the oil after regeneration. Their concentration should therefore be monitored and replenished when necessary.

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Section: Resultsmentioning

confidence: 99%

Section: Dielectric Dissipation Factor (Tan δ)mentioning

confidence: 99%

Comparative study of the degradation rate of new and regenerated mineral oils following electrical stress

Oumert

Boucherit

Zafour

et al. 2018

IET Generation, Transmission & Distribution

View full text Add to dashboard Cite

show abstract

“…In [5], a two-stage maintenance scheduler (mid-term and short-term) is presented for transformer asset maintenance management. The effect of temperature and electrical stress on transformer insulation is experimentally analyzed in [9], through measuring and diagnosing the main characteristics of insulation, such as the tan δ and resistivity. IEEE presents a set of experimental equations in the IEEE Std.…”

Section: Faanmentioning

confidence: 99%

Leveraging sensory data in estimating transformer lifetime

Mahoor

Majzoobi

Hosseini

et al. 2017

2017 North American Power Symposium (NAPS)

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Transformer lifetime assessments plays a vital role in reliable operation of power systems. In this paper, leveraging sensory data, an approach in estimating transformer lifetime is presented. The winding hottest-spot temperature, which is the pivotal driver that impacts transformer aging, is measured hourly via a temperature sensor, then transformer loss of life is calculated based on the IEEE Std. C57.91-2011. A Cumulative Moving Average (CMA) model is subsequently applied to the data stream of the transformer loss of life to provide hourly estimates until convergence. Numerical examples demonstrate the effectiveness of the proposed approach for the transformer lifetime estimation, and explores its efficiency and practical merits.

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“…The insulation structure of oil-impregnated power transformer insulation is oil-paper insulation. The oilpaper insulation system of a power transformer was gradually aged during the power transformer lifespan due to the effects of various exterior factors, such as water, temperature, and oxygen, which severely threatened the safe operation of power systems [1][2][3]. Therefore, accurately diagnosing the aging state of the transformer oil-paper insulation has become a hot topic among research groups worldwide [4].…”

Section: Introductionmentioning

confidence: 99%

Condition Evaluation for Aging State of Transformer Oil-paper Insulation Based on Time-frequency Domain Dielectric Characteristics

Liu

Liao

Zhang

et al. 2015

Electric Power Components and Systems

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Experimental Investigation Using Accelerated Aging Factors on Dielectric Properties of Transformer Insulating Oil

Cited by 25 publications

References 7 publications

Comparative study of the degradation rate of new and regenerated mineral oils following electrical stress

Comparative study of the degradation rate of new and regenerated mineral oils following electrical stress

Leveraging sensory data in estimating transformer lifetime

Condition Evaluation for Aging State of Transformer Oil-paper Insulation Based on Time-frequency Domain Dielectric Characteristics

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