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

Azmi, Kiasatina; Ahmad, Mohd Azmier; Jamil, Mohamad Kamarol Mohd

doi:10.5370/jeet.2015.10.5.2105

Cited by 24 publications

(9 citation statements)

References 44 publications

(60 reference statements)

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“…Rapp et al [3] have shown that the lightning impulse breakdown voltage of natural ester fluids show similar characteristics when compared with mineral oil. Dielectric characteristics of natural ester based oils have been reported in several earlier papers [4,5].…”

Section: Introductionmentioning

confidence: 95%

Statistical Analysis of Partial Discharge, Lightning Impulse and BDV Characteristics of Nano SiO2-Corn Oil for HV Insulation Applications

Rajeswari

Chandrasekar²,

Karthik³

2019

J. Electr. Eng. Technol.

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Recent concern towards environmental and fire safety of transformer operation has led to the development of natural ester based liquid insulation for power transformers. Recent advancements in nano technology confirm that the nano modified liquid insulation provides superior dielectric and thermal properties. Statistical analysis of the dielectric properties of nano modified liquid dielectrics is very important to qualify them for high voltage insulation applications. In this work, experimental works are carried out to understand the partial discharge (PD), lightning impulse (LI) and breakdown voltage (BDV) characteristics of corn oil filled with SiO 2 nano fillers at different wt% concentration such as 0.01%, 0.05% and 0.1%. Needle/ plane and rod/plane electrode geometry was used for creation of PD source. PD inception voltage, time domain and frequency domain characteristics of PD signals are evaluated. Weibull parameters of Phase Resolved PD pattern are evaluated. LI tests are performed at needle/plane and needle/sphere electrode geometry with standard 1.2/50 µs waveform at both positive and negative polarity. Weibull distribution analysis of LI breakdown voltage values are evaluated at different experimental conditions. BDV tests are carried out at different electrode gap distances such as 1, 2.5, 4 and 5 mm. Scale parameter and shape parameter of Weibull distribution of BDV values are computed. It is mostly observed that addition of nano SiO 2 filler at lower wt% concentration in the range of 0.01-0.05% has substantial effect in enhancing the PD, LI and BDV characteristics of corn oil. Improvement in PD, LI and BDV characteristics gives confident that nano modified corn oil may be considered for outdoor transformer applications.

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Section: Introductionmentioning

confidence: 95%

Statistical Analysis of Partial Discharge, Lightning Impulse and BDV Characteristics of Nano SiO2-Corn Oil for HV Insulation Applications

Rajeswari

Chandrasekar²,

Karthik³

2019

J. Electr. Eng. Technol.

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“…Blends of MI and NEI oils have been shown to have good oxidation stability, which will reduce the overall cost of transformer operation associated with frequent oil changes. The optimal mixing ratio has been shown to be 80% of MI oil and 20% of synthetic or NEI oil [23]- [25]. In this study, an attempt has been made to determine the best mixing ratio for MI-NEI oil blends in terms of the AC breakdown voltage (NEI oil is palm oil based).…”

Section: Introductionmentioning

confidence: 99%

Effect of mixing ratio on the breakdown voltage of mineral and natural ester insulating oil blends

Ghani

Chairul²,

Khiar³

et al. 2022

Bulletin EEI

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To date, the most common insulating oil used in oil-immersed transformers is mineral insulating (MI) oil, which is derived from petroleum. Owing to the depletion of petroleum over the years, it can be anticipated that petroleum-derived products such as MI oils will also deplete in the future. MI oils are not only non-renewable, but they are also non-biodegradable, where these oils are harmful to the environment in cases of oil spillage. Therefore, the aim of this study is to investigate the potential of mixing MI oil with natural ester insulating (NEI) oil in order to reduce the high dependency on MI oil for transformer applications. The MI and NEI oils were mixed with different mixing ratios. AC breakdown voltage test was conducted on the MI-NEI oil blends according to the ASTM D1816 standard. From the results, it is found that the following mixing ratios (30% of MI oil + 70% of NEI oil, 20% of MI oil + 80% of NEI oil) result in significant improvement in terms of the AC breakdown voltage compared with unused MI oil. The flash point and corrosivity levels of the oil blends were also examined.

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“…Vegetable oils are among the viable alternatives of dielectric insulation fluids that have been identified for application in transformers. In recent years, a number of laboratory studies have been carried out to examine the suitability of these oils; these covered different aspects, including their dielectric, physical, and chemical properties [ 1 , 2 , 3 , 4 ]. Vegetable oils have also been tested and applied in transformers at different voltage levels [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

“…To date, different types of vegetable oils have been proposed for potential application in transformers usage, such as rapeseed, sunflower, olive, castor, palm and coconut oils [ 1 , 2 , 4 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ]. Several studies have also been carried out on chemically modified vegetable oils [ 13 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Ageing Study of Palm Oil and Coconut Oil in the Presence of Insulation Paper for Transformers Application

et al. 2018

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This paper presents a sealed ageing study of palm oil (PO) and coconut oil (CO) in the presence of insulation paper. The type of PO under study is refined, bleached, and deodorized palm oil (RBDPO) olein. Three different variations of RBDPO and one sample of CO are aged at temperatures of 90 °C, 110 °C, and 130 °C. The properties of RBDPO and CO as well as paper under ageing are then analysed through dielectric and physicochemical measurements. It is found that the effect of ageing is not significant on the alternating current (AC) breakdown voltages and relative permittivities of RBDPO and CO. There is a slight increment trend of the resistivity for CO, while for all of the RBDPO, the resistivity slightly decreases as the ageing progresses. Only CO shows an apparent reduction of the dielectric dissipation factor. Throughout the ageing time, the acidities of all of the RBDPO and CO remain at low level, while the moisture in oils decreases. The tensile index (TI) of the papers for all of the RBDPO and CO retain more than 50% of the TI. A significant increment of the paper ageing rates of all of the RBDPO and CO is observed at an ageing temperature of 130 °C.

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

Cited by 24 publications

References 44 publications

Statistical Analysis of Partial Discharge, Lightning Impulse and BDV Characteristics of Nano SiO2-Corn Oil for HV Insulation Applications

Statistical Analysis of Partial Discharge, Lightning Impulse and BDV Characteristics of Nano SiO2-Corn Oil for HV Insulation Applications

Effect of mixing ratio on the breakdown voltage of mineral and natural ester insulating oil blends

Ageing Study of Palm Oil and Coconut Oil in the Presence of Insulation Paper for Transformers Application

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