Aging Performance and Moisture Solubility of Vegetable Oils for Power Transformers

Tenbohlen, Stefan; Koch, M.

doi:10.1109/tpwrd.2009.2034747

Cited by 220 publications

(130 citation statements)

References 3 publications

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“…The BDV of transformer insulation oils reduces as the moisture content increases [2,3]. High moisture content coupled with dissolved gases that have pressures higher than the ambient pressure also leads to bubbling effect in transformers [2,3].…”

Section: Effects Of Moisture On Breakdown Voltage Of Oilsmentioning

confidence: 99%

See 1 more Smart Citation

Comparative study of Breakdown Phenomena and Viscosity in Liquid dielectrics

Srinivasa¹,

Chandrakanth²,

Valentina³

et al. 2017

International Journal of Innovative Research in Electrical, Ele

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Liquid dielectrics are extensively used in electrical apparatus which are operating in distribution and transmission systems. The function of electrical equipment strongly depends on the conditions of liquid dielectric. Liquid dielectrics are used is the most expensive components in power system apparatus like transformers and circuit breakers. A failure of these equipment would cause a heavy loss to the electrical industry and also utilities. Insulation failures are the leading cause of transformer failures and thus the liquid dielectrics plays a major role in the safe operation of transformers. One of the main cause for the failure of transformers is due to the presence of moisture. In this work, the life of insulating medium is estimated by comparing the Breakdown strength and Viscosity of different pure oils with that of the contaminated oils (which contains moisture) and also finding the alternative for mineral oil i.e. vegetable oils which are reliable, cost-effective and environmentally friendly even when they are contaminated.

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Section: Effects Of Moisture On Breakdown Voltage Of Oilsmentioning

confidence: 99%

“…High moisture content coupled with dissolved gases that have pressures higher than the ambient pressure also leads to bubbling effect in transformers [2,3]. Therefore monitoring of moisture in oil is a routine maintenance procedure [4].…”

Section: Effects Of Moisture On Breakdown Voltage Of Oilsmentioning

confidence: 99%

Comparative study of Breakdown Phenomena and Viscosity in Liquid dielectrics

Srinivasa¹,

Chandrakanth²,

Valentina³

et al. 2017

International Journal of Innovative Research in Electrical, Ele

View full text Add to dashboard Cite

show abstract

“…Breakdown in contaminated liquids takes place by three mechanisms [7]  Suspended Particle Mechanism  Cavitation and Bubble Mechanism  Stressed Oil Volume Mechanism Since the BDV of transformer insulation oils reduces as the moisture content increases [2,3]. High moisture content coupled with dissolved gases that have pressures higher than the ambient pressure also leads to bubbling effect in transformers [2,3].…”

Section: Breakdown In Contaminated Liquidsmentioning

confidence: 99%

Comparative Study of Different Phenomena in Liquid Dielectrics at Different Gap Distances

Srinivasa¹,

Chandrakanth²,

Valentina³

et al. 2017

International Journal of Innovative Research in Electrical, Ele

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Abstract:The success of any electrical system lies in its insulating system performance. Petroleum based mineral oils are the generally used fluids for electrical insulation and heat transfer. But they are non-biodegradable. Vegetable oils obtained from seeds, flowers and vegetables are biodegradable, non -toxic, environmental friendly and benign to aquatic or terrestrial. The objective of this paper is to analyse the breakdown voltage and physical viscosity, flash point and fire point of sunflower oil, palm oil and mineral oil with and without moisture in them at different gap distances.

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“…The most attractive features of vegetable oils are that they are biodegradable, non-toxic and most environmental friendly. Extensive studies were carried out for the past two decades to find a suitable alternate vegetable oil for electrical applications [2][3][4][5][6][7][8][9][10][11][12][13][14]. The major problem faced with the liquid insulation for transformer applications is the aging and degradation of the insulating medium due to various stresses such as electrical and thermal, which in turn affects the long-term performance of the oil.…”

Section: Introductionmentioning

confidence: 99%

“…The major problem faced with the liquid insulation for transformer applications is the aging and degradation of the insulating medium due to various stresses such as electrical and thermal, which in turn affects the long-term performance of the oil. There is now considerable interest in understanding the thermal aging characteristics of vegetable oils which is not yet well reported [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Investigations on PD Characteristics of Thermal aged Palm and Corn Oil for Power Transformer Insulation Applications

Senthilkumar¹,

Karthik²,

Chandrasekar³

2014

Journal of Electrical Engineering and Technology

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-Partial discharge (PD) detection plays a major role in the life time assessment of liquid insulation in power transformers. Many research works are being carried out to replace conventional mineral oil insulation in transformers by vegetable oils. It is necessary to understand the PD characteristics of vegetable oils before recommending them as an alternate for mineral oil. In this paper, the breakdown strength and PD characteristics of palm and corn oil were investigated in both unaged and thermally aged conditions. Laboratory experiments were performed as per IEC test procedures. PD signals were measured using wide band detection system. Phase resolved PD pattern of vegetable oils and mineral oil were compared. Effect of increase in voltage stress on the PD pattern of palm and corn oil were studied. Time and frequency domain analysis of PD pulses at needle-plane electrode configuration was carried out. Statistical analysis of PD pattern i.e. skewness and shape parameter variations with respect to applied thermal stress were also carried out. From the results, it is observed that palm and corn oils have better breakdown strength and PD characteristics even under long-term thermal stress and hence they can be used for power transformer applications.

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Aging Performance and Moisture Solubility of Vegetable Oils for Power Transformers

Cited by 220 publications

References 3 publications

Comparative study of Breakdown Phenomena and Viscosity in Liquid dielectrics

Comparative study of Breakdown Phenomena and Viscosity in Liquid dielectrics

Comparative Study of Different Phenomena in Liquid Dielectrics at Different Gap Distances

Investigations on PD Characteristics of Thermal aged Palm and Corn Oil for Power Transformer Insulation Applications

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