Investigation on the lightning breakdown voltage of Palm Oil and Coconut Oil under non-uniform field

Thien, Yee Von; Azis, Norhafiz; Jasni, Jasronita; Kadir, Mohd Zainal Abidin Ab; Yunus, Robiah; Ishak, Mohd Taufiq; Yaakub, Zaini

doi:10.1109/pecon.2014.7062402

Cited by 10 publications

(8 citation statements)

References 16 publications

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“…This might be due to streamer propagation in vegetable oils being different from in mineral oil. The previous studies in a divergent field and uniform/quasi uniform field [15,21,29,[33][34][35] showed that the ester liquids have lower impulse breakdown voltages, especially at larger gaps, than mineral oil. This is because streamers in the vegetable oils propagate faster and further than in the mineral oil at the same voltage level.…”

Section: Testing Methods Effect On the Breakdown Voltagementioning

confidence: 99%

Lightning Breakdown Voltage Evaluation of Palm Oil and Coconut Oil as Transformer Oil under Quasi-Uniform Field Conditions

et al. 2018

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This paper presents lightning (1.2/50 µs) breakdown voltages of palm oil (PO), coconut oil (CO) and mineral oil (MO) in a quasi-uniform sphere to sphere electric field at two gap distances. The type of PO used in this study is Refined Bleached Deodorized Palm Oil (RBDPO) Olein type. The effect of voltage polarities (positive and negative) and testing methods (rising voltage, up and down and multiple level) on the lightning breakdown performance were investigated. The results indicated that lightning breakdown voltages of CO and RBDPO are comparable to those of MO under various test conditions. The results indicated that there is no polarity effect for lightning impulse breakdown tests in a quasi-uniform field. The testing methods, including rising voltage method, up and down method and multiple level method have a notable influence on the breakdown voltages. The effect of the 50% breakdown voltage on rising voltage method, up and down method and multiple level method for RBDPO and CO is comparable to MO. The withstand voltage at 1% and 50% breakdown probabilities were obtained using the Normal distribution fitting on the cumulative probability plot of impulse shots. Based on a normal distribution fitting, withstand voltages 1% breakdown probability of POA were close to the MO. Finally, based on statistical studies and simulation using ANSYS software, the prediction formulas for breakdown voltage for larger gap distances for all samples were derived.

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Section: Testing Methods Effect On the Breakdown Voltagementioning

confidence: 99%

Lightning Breakdown Voltage Evaluation of Palm Oil and Coconut Oil as Transformer Oil under Quasi-Uniform Field Conditions

et al. 2018

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“…A number of studies had been carried out on PO and CO previously, covering different aspects such as the dielectric, chemical/physical and ageing properties (Abeysundara et al, 2001;Abdullahi et al, 2004;Aditama, 2005;Tenbohlen et al, 2010;Kano et al, 2012;Kurnianto et al, 2012;Banumathi et al, 2013;Azis et al, 2013;Arief et al, 2014;Johari et al, 2014;Suleiman et al, 2014). Concerning the dielectric properties, parameters such as the AC breakdown strength, lightning breakdown strength, dielectric dissipation factor, relative permittivity and resistivity of PO and CO had been examined (Katim et al, 2014;Mohamad et al, 2014;Sinan et al, 2014;Thien et al, 2014). Among the most common PO proposed for applications in transformers is Refined Bleached and Deodorised Palm Oil (RBDPO).…”

Section: Introductionmentioning

confidence: 99%

The effect of polarity on the lightning breakdown voltages of palm oil and coconut oil under a non-uniform field for transformers application

Thien

Azis

Jasni

et al. 2016

Industrial Crops and Products

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a b s t r a c tThis paper presents a study of the lightning breakdown voltages of Palm Oil (PO) and Coconut Oil (CO) under a non-uniform field with consideration on the polarity effect at various gap distances. All tests were carried based on a needle-sphere electrode configuration and various gap distances ranging from 2 to 25 mm under positive and negative voltage polarities. Three different testing techniques were used in this study including rising-voltage, up-and-down and multiple-voltage methods. The PO used in this study was Refined, Bleached and Deodorised Palm Oil (RBDPO) Olein. Three different samples of RBDPO and one sample of CO were tested. The Weibull distribution was used as a statistical approach to determine the withstand voltages of all samples at 1% and 50% probabilities for each type of oil. Under positive voltage polarity, it was found that the 50% breakdown voltages of RBDPO and CO were comparable with Mineral Oil (MO) whereby the highest percentage of difference among all gap distances was less than 15%. RBDPO and CO have lower 50% breakdown voltages than MO under a negative lightning impulse for which the highest percentage of difference can be up to 40%.

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“…On the other hand, CO can be extracted from the kernel of a matured coconut from a coconut palm. Previous studies on RBDPO and CO covered on different aspects including AC / lightning breakdown voltages, partial discharge, dielectric, physical and chemical properties [2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Evaluation on the Lightning Breakdown Voltages of Palm Oil and Coconut Oil under Non-Uniform Field at Small Gap Distances

Thien¹,

Azis²,

Jasni³

et al. 2016

Journal of Electrical Engineering and Technology

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-In recent years, there are a number of studies that have been carried out to explore the alternative for Mineral Oil (MO) as dielectric insulating fluid in transformers due to the increasing tight regulation on safety and environment. Vegetable oils have been identified as suitable candidate since it is biodegradable, non-toxic and high flash/fire points which ensure more in-service safety. Among the types of vegetable oils considered for transformers application are Palm Oil (PO) and Coconut Oil (CO). This paper presents an experimental study on the lightning breakdown voltages of PO and CO under non-uniform electric field based on needle-sphere electrodes configuration at 3 small gap distances. The type of PO used in this study is Refined Bleached and Deodorized Palm Oil (RBDPO) Olein. The main focus of this study is to examine the lightning breakdown performance of RBDPO and CO under different test conditions and assess its suitability as dielectric insulating fluid in transformers. The effect of voltage polarities (positive and negative) and testing methods (risingvoltage, up-and-down and multiple-voltage) were investigated. The data obtained from all tests were analysed by Weibull distribution in order to determine the withstand voltages for each type of oils. It was found that the breakdown voltages of RBDPO and CO are comparable with MO under positive lightning impulse. Under negative lightning impulse, the breakdown voltage of MO is slightly higher than RBDPO and CO. There is no significant effect of testing methods and voltage polarities on lightning breakdown voltages of RBDPO and CO. Based on the statistical analysis, it is found that the breakdown voltages of RBDPO and CO at 1% probability are slightly lower than MO.

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Investigation on the lightning breakdown voltage of Palm Oil and Coconut Oil under non-uniform field

Cited by 10 publications

References 16 publications

Lightning Breakdown Voltage Evaluation of Palm Oil and Coconut Oil as Transformer Oil under Quasi-Uniform Field Conditions

Lightning Breakdown Voltage Evaluation of Palm Oil and Coconut Oil as Transformer Oil under Quasi-Uniform Field Conditions

The effect of polarity on the lightning breakdown voltages of palm oil and coconut oil under a non-uniform field for transformers application

Evaluation on the Lightning Breakdown Voltages of Palm Oil and Coconut Oil under Non-Uniform Field at Small Gap Distances

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