KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Search Results

Now showing 1 - 8 of 8

Some of the metrics are blocked by your
consent settings
Experimental Study of the Electrical and Physiochemical Properties of Different Types of Crude Palm Oils as Dielectric Insulating Fluids in Transformers
(2023-10-01)
Muangpratoom, Pichai
;
Suriyasakulpong, Chinnapat
;
Maneerot, Sakda
;
Vittayakorn, Wanwilai
;
Pattanadech, Norasage
This paper gives information on the electrical and physiochemical characteristics of six different types of palm oil compared with traditional mineral oil. We found that natural processed crude palm oil (PO-C) had a higher resistance to AC breakdown voltage than other types of palm oil, including traditional mineral oil. The results of the positive lightning impulse voltage test for PO-C were still the highest compared to other types of palm oil, including traditional mineral oil, at 58.26%. The summarised dissipation factors of all tested crude palm oils were significantly higher than those of mineral oils, which will make the palm oil less insulating, especially in PO-A palm oil (36.197%), where the values were higher than those of other oils, while mineral oil has a slightly increased dispersion factor. For relative permittivity, all palm oils were compared, and it was found that PO-C had a lower relative permittivity than the other oils. In terms of physical and chemical properties, in the moisture content test on all oils, PO-C had the percentile with the highest moisture content decrease of 58.74%. In the case of testing the surface tension value, it was found that traditional mineral oil had the highest value (48.46 m/Nm) when compared to palm oil. On the other hand, the acidity in traditional mineral oil is the lowest (0.03 mg KOH/g) compared to all palm oils. Results from studies demonstrate the possibility of using natural processed crude palm oil, or PO-C, as a replacement for traditional mineral oil. This is consistent with the results of electrical properties that show PO-C is higher than other types of palm oil and includes traditional mineral oil.
Some of the metrics are blocked by your
consent settings
Improvement of the Electrical Performance of Outdoor Porcelain Insulators by Utilization of a Novel Nano-TiO2 Coating for Application in Railway Electrification Systems
(2023-01-01)
Muangpratoom, Pichai
;
Khonchaiyaphum, Issaraporn
;
Vittayakorn, Wanwilai
The present study aimed to develop the electrical performance of outdoor insulators using a nano-TiO<inf>2</inf> coating for railway electrification systems. The prototype design of porcelain insulators with normal coatings and using a nano-TiO<inf>2</inf> coating is based on IEC 60815-1. The first test was performed to measure the low-frequency flashover AC voltage under both dry and wet conditions. In addition, the other test was conducted to measure the lightning impulse critical-flashover voltage at positive and negative polarity under dry-normal and wet-contaminated conditions. X-ray diffraction (X-RD) and Scanning electron microscopy (SEM) were used to examine the micro surface and show that the nano-TiO<inf>2</inf> coating was adhered to the surface of the outdoor porcelain insulator and exists in an amorphous state. Additionally, it was observed and discovered that scattered nano-TiO<inf>2</inf> strengthens the glassy matrix and creates a sturdy barrier that causes flashover voltage to be reduced under conditions of high dielectric strength. Nanostructured ceramic formulations outperform ordinary porcelain in terms of breakdown voltage strength, particularly for the insulators’ low-frequency flashover performances under dry and wet test conditions. However, a significant change in the lightning impulse critical-flashover voltage characteristics is observed and is not much better when adding the nano-TiO<inf>2</inf> coating to the porcelain insulators.
Some of the metrics are blocked by your
consent settings
THE INFLUENCE of NANOPARTICLES on the DIELECTRIC DISSIPATION FACTOR and LIGHTNING PROPERTIES in PALM OIL-BASED NANOFLUIDS
(2022-04-01)
Pattanadech, Norasage
;
Muangpratoom, Pichai
In this study, the influence of nanoparticles when mixed with insulating palm oil is investigated in terms of tan δ or the dielectric dissipation factor and lightning properties. Three different nanofluid sample types are derived from the dispersion of zinc oxide (ZnO), titanium dioxide (TiO2) and barium titanate (BaTiO3). The nanoparticle concentrations tested were 0.01% and 0.03% while the base fluid was unmodified palm oil. Evaluation of tan δ was performed in accordance with the IEC 60247 standard via the use of the tan δ meter (model SOKEN: DAC-IM-D6) and the lightning impulse breakdown voltage were based on the IEC 60897 standard. In order to test the electrical insulation qualities of the palm oil over a range of temperatures from 35-90°C for each of the tan δ values revealed the dielectric loss tangent, and the findings lightning properties was performed at the room temperature. Significant increases of the palm oil with nanoparticles in comparison to unmodified palm oil. These results suggested that further investigation would be worthwhile to better understand the effects of the nanoparticles in palm oil upon tan δ and the lightning impulse breakdown voltage characteristics in order to make additional improvements.
Some of the metrics are blocked by your
consent settings
An Investigation of the Electrical Properties of Pressboard Impregnated with Mineral Oil-Based Nanofluids at Different Concentrations of Fe3O4Magnetic Nanoparticles
(2022-01-01)
Muangpratoom, Pichai
;
Khonchaiyaphum, Issaraporn
;
Vittayakorn, Wanwilai
The purpose of this study was to investigate the electrical properties of pressboard impregnated with mineral oil-based nanomaterial. The nanomaterial focused on in this study was magnetite (Fe3O4) at ratios of 0.01%, 0.03%, and 0.05% by mineral oil volume. The electrical tests were performed on the AC breakdown strengths and positive-negative lightning impulse breakdown strengths on impregnated pressboard were carried out in compliance with IEC 60641 and IEC 60243, respectively. Scanning electron microscopy (SEM) and X-ray Diffraction (X-RD) were used to study the micro surface and show that Fe3O4 nanoparticles of nanoscale size were adhered to the pressboard surface and exist in an amorphous state. The results found that the AC breakdown strengths of pressboard impregnated with mineral oil-based Fe3O4 nanofluids at 0.03 wt% were increased the most. Moreover, the lightning impulse breakdown strengths of pressboard impregnated with mineral oil-based Fe3O4 nanofluids at 0.03 wt% were increased the most in both positive and negative polarities. The results, thus, showed promising directions for applications of Fe3O4 nanomaterials to improve the electrical properties of pressboard.
Some of the metrics are blocked by your
consent settings
Dielectric properties of mineral oil-based nanofluids under temperature variations
(2019-11-01)
Muangpratoom, Pichai
;
Pattanadech, Norasage
The aim of this research is to improve the electrical properties of dielectric liquids. An examination of the dielectric properties of mineral oil-based nanofluids was carried out, using three different nanoparticle types: titanium dioxide, zinc oxide, and barium titanate, each with a mean diameter not exceeding 100 €.nm. The test samples were divided into two groups, including mineral oil mixed with nanoparticles at a concentration of 0.01 and 0.03% volume fraction, respectively. Determination of the AC breakdown voltage of the unmodified mineral oil and the nanofluid samples was performed through testing at temperatures varying within the range of 35-90°C in accordance with the standards of IEC 60156. Furthermore, testing was also performed to determine the dielectric dissipation factor (tand) for each of the liquid samples according to IEC 60247. From the study, it was shown that the performance of nanofluid was significantly affected by increasing the temperature. It could be observed from the findings that the use of nanoparticles in creating mineral oil-based nanofluids had potential to bring a number of advantages in terms of dielectric applications.
Some of the metrics are blocked by your
consent settings
Breakdown and Partial discharge characteristics of Mineral oil-based nanofluids
(2018-08-01)
Muangpratoom, Pichai
;
Pattanadech, Norasage
In this study, the AC breakdown (BD) voltages and partial discharge (PD) activities of mineral-oil (MO)-based nanofluids were investigated under controlled conditions. The aim of this research is to improve the dielectric properties of MO by amalgamation with various types of nanoparticles, i.e. semiconducting and dielectric nanoparticles. Two types of nanoparticles, i.e. titanium dioxide and barium titanate with mean diameters of < 100 nm were used in the nanofluid samples prepared for the experiments. The AC BD voltages of the nanofluids were investigated according to IEC 60156. In addition, PD characteristics of the MO-based nanofluids were examined including PD inception voltage (PDIV) characteristics and PD activity with a needle-plane electrode configuration. The test circuit was set up in accordance with IEC 60270 and the experiment was performed in conformity with IEC 61294 at room temperature. The test results showed that the AC BD voltages of the modified liquids were clearly influenced by the type of nanoparticles added, with the AC BD voltages of the MO with nanoparticles being slightly higher than those of the unmodified MO used for comparison. Furthermore, the nanoparticles also demonstrated a propensity to increase the PDIV of the nanofluids compared with the PDIV of the MO.
Some of the metrics are blocked by your
consent settings
Impulse breakdown characteristic of mineral oil based nanofluid
(2017-11-29)
Muangpratoom, Pichai
;
Pattanadech, Norasage
;
Kunakorn, Anantawat
;
Vittayakorn, Wanwilai
Mineral-oil based nanofluids are proved that the addition of suitable nanoparticles can increases the AC breakdown voltage and Partial Discharge Inception Voltage (PDIV) compared with those of the unmodified mineral oil. In this paper, a standard impulse breakdown voltage of the mineral oil and the mineral-oil based nanofluids is investigated. Three types of nanoparticle, i.e., Zinc oxide (ZnO), Barium titanate (BaTiO<inf>3</inf>) and Titanium dioxide (TiO<inf>2</inf>) with the mean diameter less than 100 nm are used to prepare the nanofluid samples. The first group of the nanofluid sample consists of the mineral oil mixed with the 0.01% volume fraction of nanoparticle. Another group of nanofluid sample comprises the mineral oil mixed with the 0.03% volume fraction of nanoparticle. Besides, the surfactant sorbitan monooleate (Span 80) is added in order to modify the surface of the nanoparticles. The needle-sphere electrode configuration with the gap spacing of 15 mm is employed for impulse breakdown voltage investigation of the dielectric liquids. The test circuit is set up in accordance with IEC 60897, and the test experiment is performed at the room temperature. The results show that the addition of ZnO and TiO2 nanoparticle leads to the change in the impulse breakdown characteristics of the mineral oil in both positive and negative impulse polarities. However, no significant change in the impulse breakdown characteristics is observed when adding BaTiO3 to the oil.
Some of the metrics are blocked by your
consent settings
Dielectric breakdown strength of mineral oil based nanofluids
(2016-11-28)
Muangpratoom, Pichai
;
Pattanadech, Norasage
In this paper, the dielectric properties of the mineral oil-based nanofluids was studied. The aim of this research is to improve electrical property of the mineral oil by applying nanotechnology knowledge. Three types of nanoparticle i.e. Titanium dioxide (TiO<inf>2</inf>), Barium titanate (BaTiO<inf>3</inf>) and Zinc oxide (ZnO) with the mean diameter less than 100 nm were used in the experiment. The nanofluid samples, the mineral oil mixed with nanoparticle, were prepared in three processes. Firstly, the mineral oil was mixed with 0.01% of nanoparticle volume fraction of nanoparticle. Besides, the mineral oil was also mixed with 0.03% of nanoparticle volume fraction. Then it was dispersed by using a magnetic stirrer. Finally, the ultrasonic dispersant technique was applied for the prepared nanofluids to ensure the homogeneity of such liquid. To measure the AC breakdown voltages, an oil breakdown tester (FOSTER OTS 60AF) was used. The gap distance between electrodes was set to be 2.5 mm. The testing was carried out 6 times for each liquid test sample according to IEC 60156. The test results showed that the AC breakdown property of the modified liquid was strongly influenced by the type of the nanoparticles added. With the addition of nanoparticles, the AC breakdown voltage increased slightly above that of the mineral oil (37 kV). In case of 0.01% nanoparticle volume fraction, the AC breakdown voltage of the mineral oil with TiO<inf>2</inf>, the mineral oil with BaTiO<inf>3</inf> and the mineral oil with ZnO was 42 kV, 45 kV and 46 kV respectively. For 0.03% nanoparticle volume fraction, the AC breakdown voltage of the mineral oil with TiO<inf>2</inf>, the mineral oil with BaTiO<inf>3</inf> and the mineral oil with ZnO was 45 kV, 48 kV and 60 kV respectively. From these results, it is indicated that nanoparticles is a good candidate to develop mineral oil-based nanofluids for dielectric applications.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results