Performance of coconut oil as an alternative transformer liquid insulation

Matharage, S. Y.; Fernando, M. A. R. M.; Bandara, M. A. A. P.; Jayantha, G. A.; Kalpage, C. S.

doi:10.1109/tdei.2013.6518958

Cited by 84 publications

(33 citation statements)

References 23 publications

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“…Besides the coconut oil, sunflower and rapeseed have excellent fire resistance and biodegradability properties. 14 Comparison of typical values 34 of different insulating properties has been given in Table 6. A large number of research works have been done by the researchers across the globe to find out an environment-friendly substitute of transformer mineral oil.…”

Section: Properties Of Alternative Transformer Insulating Liquidmentioning

confidence: 99%

Electrical insulating liquid: A review

Mahanta¹,

Laskar

2017

J. Adv. Dielect.

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Insulating liquid plays an important role for the life span of the transformer. Petroleum-based mineral oil has become dominant insulating liquid of transformer for more than a century for its excellent dielectric and cooling properties. However, the usage of petroleum-based mineral oil, derived from a nonrenewable energy source, has affected the environment for its nonbiodegradability property. Therefore, researchers direct their attention to renewable and biodegradable alternatives. Palm fatty acid ester, coconut oil, sunflower oil, etc. are considered as alternatives to replace mineral oil as transformer insulation liquid. This paper gives an extensive review of different liquid insulating materials used in a transformer. Characterization of different liquids as an insulating material has been discussed. An attempt has been made to classify different insulating liquids-based on different properties.

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Section: Properties Of Alternative Transformer Insulating Liquidmentioning

confidence: 99%

Electrical insulating liquid: A review

Mahanta¹,

Laskar

2017

J. Adv. Dielect.

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“…As the dissociation coefficient of mineral oil increases with temperature, more charge carriers will be generated through ionic dissociation, resulting in a high conductivity if the temperature rises. As reported by other researchers, the relative permittivity of insulting oil changes slightly with the temperature [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The viscosity of mineral oil decreases with temperature.…”

Section: Coelho's Space Charge Polarization Theorymentioning

confidence: 83%

“…Various diagnostic methods have been applied to monitor dielectric changes in insulating liquid over time, no matter these changes are due to thermal, electrical or chemical effects [1][2][3][4]. Dielectric spectroscopy technique, which enables us to gain a bunch of information about the dynamics of bound and mobile charge carriers, has been widely employed in the evaluation of insulating properties of dielectric liquids [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Study of the charge dynamics in mineral oil under a non-homogeneous field

Zhou

Hao

Wilson

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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The presence of mobile charge carriers can affect the frequency response of complex permittivity of insulating liquid when the frequency is low. It has been found that the experimental results of the complex permittivity of mineral oils are in a good agreement with Coelho's frequency response theory when an extra contribution to the complex permittivity arising from DC conduction is taken into account. It has been reported that small quantity of high mobility charge carriers are responsible for this DC conduction. In our previous work, we have found that if the charge carriers are fast enough so that they can reach the opposite electrode in a cycle, the motion of these fast charge carriers can only contribute to the imaginary part of the complex permittivity under a homogeneous field. In this paper, the polarization induced by the motion of those fast charge carriers under a non-homogeneous field has been studied. It has been found when the field is not high, the total current caused by the drift and diffusion of those fast charge carriers is proportional to the external voltage. A modified space charge polarization theory has been proposed. The frequency dependence of the complex permittivity obtained experimentally has been fitted using this modified Coelho model and compared with our previous simulation. This modified model enables one to gain a better understanding of the frequency response in mineral oil in low frequency regions.

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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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Performance of coconut oil as an alternative transformer liquid insulation

Cited by 84 publications

References 23 publications

Electrical insulating liquid: A review

Electrical insulating liquid: A review

Study of the charge dynamics in mineral oil under a non-homogeneous field

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

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