Comparison of properties of electrical discharges developing in natural and synthetic ester at inception voltage

Rózga, Paweł; Stanek, Marcin; Cieslinski, D.

doi:10.1109/ceidp.2013.6748243

Cited by 20 publications

(19 citation statements)

References 13 publications

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“…Other study at gap distance of 100 mm also showed the same pattern [17]. However, at small gap distances between 5 mm and 20 mm, it was found that the 50% breakdown voltages of vegetable oils at negative and positive polarities were quite close [20].…”

Section: Introductionmentioning

confidence: 65%

“…In one of the study, it was reported that at gap distances between 5 mm and 20 mm, the 50% breakdown voltages of esters were quite close to Mineral Oil (MO) under both negative and positive polarities [20]. Other studies showed that the 50% breakdown voltages of vegetable oils were slightly lower than MO at gap distances between 60 mm and 100 mm [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…Previously, there were a number of lightning studies that had been carried out on other types of vegetable oils such as natural and synthetic esters [15][16][17][18][19][20][21][22][23][24][25][26][27]. Among the common lightning study is the performance under non-uniform field.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

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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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“…It is shown that the kinematic viscosity of mineral oil was under the limit of IEC 60296 standard. Rozga et al [60] reported that the kinematic viscosity of mineral oil at 40°C also showed lower than the standard which is 9mm 2 /s. Other than that, Sun-Ho and Chang-Su [14] also reported low kinematic viscosity of mineral oil at 40°C which was 7.8mm2/s.…”

Section: Relative Permittivity (Dielectric Constant) Characteristicsmentioning

confidence: 99%

Study of Dielectric Properties of a Potential RBD Palm Oil and RBD Soybean Oil Mixture as Insulating Liquid in Transformer

Azmi¹,

Ahmad²,

Jamil³

2015

Journal of Electrical Engineering and Technology

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-This paper reported the experimental result of dielectric properties of Refined, Bleached and Deodorized Palm Oil (RBDPO) combined with 0-50% of Refined, Bleached and Deodorized Soybean Oil (RBDSO). The dielectric strength and relative permittivity of RBDPO/RBDSO was higher compared to mineral oil at all ranges of ratios and temperatures which indicated a positive sign for its possible use as insulating liquid in a transformer. All ratios of the RBDPO/RBDSO mixture also demonstrated lower dissipation factor compared to mineral oil at 40˚C, 70˚C and 90˚C. Apart from that, the kinematic viscosity for the oil mixtures shown exceeded the IEC 60296 as well as the mineral oil results. 70%RBDPO/30%RBDSO mixture ratio was chosen as the best mixing percentage after comparison was made with the mineral oil and IEC 60296 standard where the mixture accumulated the most satisfactory of dielectric properties hence making it as the potential candidate for palm and soybean-based transformer oil.

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“…This cycle was related to previously estimated inception voltages of the streamers. A procedure of inception voltage estimation was described in detail in [28]. The calculations were performed using MOSTAT software where the maximum likelihood method was applied.…”

Section: Measurement Assumptionsmentioning

confidence: 99%

Streamer Propagation and Breakdown in a Very Small Point-Insulating Plate Gap in Mineral Oil and Ester Liquids at Positive Lightning Impulse Voltage

Rózga

2016

Energies

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This article presents the results of comparative studies on streamer propagation and breakdown in a point-insulating plate electrode system in mineral oil and two ester liquids. The studies were performed for a 10-mm gap and a positive standard lightning impulse. The work was focused on the comparison of light waveforms registered using the photomultiplier technique. The results indicated that both esters demonstrate a lower resistance against the appearance of fast energetic streamers than mineral oil. The reason for such a conclusion is that the number of lightning impulses supplied to the electrode system for which the above-mentioned fast streamers appeared at a given voltage level was always higher in the case of ester liquids than mineral oil. In terms of breakdown, the esters tested were assessed as more susceptible to the appearance of breakdown in the investigated electrode system. The number of breakdowns recorded in the case of esters was always greater than the corresponding number of breakdowns in mineral oil. This may be supposed on the basis of the obtained results that imply that, in both synthetic and natural ester, the formed breakdown channel, which bridged the gap through the surface of pressboard plate, is characterized by higher energy than in the case of mineral oil.

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Comparison of properties of electrical discharges developing in natural and synthetic ester at inception voltage

Cited by 20 publications

References 13 publications

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

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

Study of Dielectric Properties of a Potential RBD Palm Oil and RBD Soybean Oil Mixture as Insulating Liquid in Transformer

Streamer Propagation and Breakdown in a Very Small Point-Insulating Plate Gap in Mineral Oil and Ester Liquids at Positive Lightning Impulse Voltage

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