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문제 정의
- Nevertheless, the dielectric properties of the oil mixture have yet to be investigated. Therefore, the aims of this research are to investigate and to compare the dielectric properties of palm oil and soybean oil mixture with mineral oil of various ratios and temperatures. The compared dielectric properties of mineral oil were obtained from the past researches at various ratios and temperatures too.
제안 방법
- The experiment of dielectric properties of RBDPO/ RBDSO mixture was performed. It is reveals that the breakdown voltage decreases with the increase of RBDSO ratio from 0% to 50%.
- In addition, the chemical composition of 100% RBDPO and 100% RBDSO were also analyzed. The purpose of analyzing the chemical composition of the oil mixtures was to prove that the ratios between RBDPO and RBDSO are aligned with the general standard of chemical composition of palm oil and soybean oil. Figs.
- The purpose of comparing the result of calculation and simulation with the Weibull distribution was to establish whether the dielectric strength obtained through calculation and simulation was aligned with the lowest required dielectric strength obtained from the Weibull distribution.
대상 데이터
- Two vegetable oil products were used in the experiments and they were palm oil and soybean oil. The palm oil product was Refined Bleached and Deodorized Palm Oil (RBDPO) which was bought from the Wilmar Edibles Oil Sdn. Bhd.
- The samples used in the experiments were the mixture of RBDPO and RBDSO. The mixture ratio of RBDSO and RBDPO varies from 0 % to 50%.
- Bhd. The soybean oil product was Refined, Bleached, and, Deodorized Soybean Oil (RBDSO) which was a commercial cooking oil known as Vesoya Cooking Oil and manufactured by Yee Lee Corporation Berhad. No treatment has been conducted on any of the oils.
- The breakdown voltage test was implemented according to IEC 60156 [29]. The test cell had a volume capacity of 400ml, consisted of VDE electrodes of 12.5mm diameter with the gap of 2.5mm. The temperature of 40℃ to 100℃ was determined by using a stirring hot plate which can sustain the temperature up until 540℃.
- Two vegetable oil products were used in the experiments and they were palm oil and soybean oil. The palm oil product was Refined Bleached and Deodorized Palm Oil (RBDPO) which was bought from the Wilmar Edibles Oil Sdn.
이론/모형
- The equipment was capable of supplying the voltage up to 100kV. The breakdown voltage test was implemented according to IEC 60156 [29]. The test cell had a volume capacity of 400ml, consisted of VDE electrodes of 12.
성능/효과
- It is reveals that the breakdown voltage decreases with the increase of RBDSO ratio from 0% to 50%. All the breakdown voltage of the oil mixture were above 30kV which fulfilled the IEC standard. The breakdown voltage of the oil mixture shows slight increases with the increment of temperatures.
- The relative permittivity of the RBDPO/RBDSO mixture is also shown to be higher than mineral oil. Although the kinematic viscosity exceeded the IEC 60296 standard and mineral oil result, the value of kinematic viscosity decrease with the increment of RBDSO into RBDPO which shows a positive result. In this paper, 70%RBDPO/30%RBDSO has been selected as the optimum mixing ratio as the potential insulating liquid in transformer.
- The dielectric strength obtained from the calculation and simulation of mean value breakdown voltage shows slightly close to the estimated lowest dielectric strength obtained from Weibull distribution at 40℃, 50℃ and 60℃ with approximate difference from 0% to 11%. Comparisons between RBDPO/ RBDSO mixture with mineral oil reported by past researchers have shown that the dielectric strength for all ratios of RBDPO/RBDSO mixture are far superior than mineral oil where all the breakdown voltage of oil mixture has exceeded the breakdown voltage of mineral oil from 40℃ to 100℃. The dissipation factor of RBDPO/RBDSO mixture has shown to decrease from 10% to 50% of RBDSO content.
- The dissipation factor of RBDPO/RBDSO mixture has shown to decrease from 10% to 50% of RBDSO content. In comparison between the oil mixture and mineral oil, the dissipation factor of the oil mixture was lower compared to mineral oil for all ranges of temperatures. Meanwhile for relative permittivity, no significant changes has been observed when the ratio of RBDSO was increased from 10% to 50%.
- Although the kinematic viscosity exceeded the IEC 60296 standard and mineral oil result, the value of kinematic viscosity decrease with the increment of RBDSO into RBDPO which shows a positive result. In this paper, 70%RBDPO/30%RBDSO has been selected as the optimum mixing ratio as the potential insulating liquid in transformer.
- The experiment of dielectric properties of RBDPO/ RBDSO mixture was performed. It is reveals that the breakdown voltage decreases with the increase of RBDSO ratio from 0% to 50%. All the breakdown voltage of the oil mixture were above 30kV which fulfilled the IEC standard.
- In comparison between the oil mixture and mineral oil, the dissipation factor of the oil mixture was lower compared to mineral oil for all ranges of temperatures. Meanwhile for relative permittivity, no significant changes has been observed when the ratio of RBDSO was increased from 10% to 50%. The relative permittivity of the RBDPO/RBDSO mixture is also shown to be higher than mineral oil.
- All the breakdown voltage of the oil mixture were above 30kV which fulfilled the IEC standard. The breakdown voltage of the oil mixture shows slight increases with the increment of temperatures. The dielectric strength obtained from the calculation and simulation of mean value breakdown voltage shows slightly close to the estimated lowest dielectric strength obtained from Weibull distribution at 40℃, 50℃ and 60℃ with approximate difference from 0% to 11%.
- The breakdown voltage of the oil mixture shows slight increases with the increment of temperatures. The dielectric strength obtained from the calculation and simulation of mean value breakdown voltage shows slightly close to the estimated lowest dielectric strength obtained from Weibull distribution at 40℃, 50℃ and 60℃ with approximate difference from 0% to 11%. Comparisons between RBDPO/ RBDSO mixture with mineral oil reported by past researchers have shown that the dielectric strength for all ratios of RBDPO/RBDSO mixture are far superior than mineral oil where all the breakdown voltage of oil mixture has exceeded the breakdown voltage of mineral oil from 40℃ to 100℃.
- Comparisons between RBDPO/ RBDSO mixture with mineral oil reported by past researchers have shown that the dielectric strength for all ratios of RBDPO/RBDSO mixture are far superior than mineral oil where all the breakdown voltage of oil mixture has exceeded the breakdown voltage of mineral oil from 40℃ to 100℃. The dissipation factor of RBDPO/RBDSO mixture has shown to decrease from 10% to 50% of RBDSO content. In comparison between the oil mixture and mineral oil, the dissipation factor of the oil mixture was lower compared to mineral oil for all ranges of temperatures.
- Meanwhile for relative permittivity, no significant changes has been observed when the ratio of RBDSO was increased from 10% to 50%. The relative permittivity of the RBDPO/RBDSO mixture is also shown to be higher than mineral oil. Although the kinematic viscosity exceeded the IEC 60296 standard and mineral oil result, the value of kinematic viscosity decrease with the increment of RBDSO into RBDPO which shows a positive result.
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