Masahiro Kozako
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View article: Acoustic Partial Discharge Localization in Refined, Bleached and Deodorized Palm Oil (RBDPO) Based on the Savitzky-Golay and Moving Average Denoising Methods
Acoustic Partial Discharge Localization in Refined, Bleached and Deodorized Palm Oil (RBDPO) Based on the Savitzky-Golay and Moving Average Denoising Methods Open
This research describes an investigation on the localization of partial discharge (PD) in Refined, Bleached and Deodorized Palm Oil (RBDPO) with the applications of 2 denoising methods, namely Savitzky-Golay (SG) and Moving Average (MA). A…
View article: Morphological Effect on High-Voltage Insulation Properties in Polypropylene/Elastomer Binary Blends: An Experimental and Simulation Study
Morphological Effect on High-Voltage Insulation Properties in Polypropylene/Elastomer Binary Blends: An Experimental and Simulation Study Open
View article: Examination on the Denoising Methods for Electrical and Acoustic Emission Partial Discharge Signals in Oil
Examination on the Denoising Methods for Electrical and Acoustic Emission Partial Discharge Signals in Oil Open
Partial discharge (PD) measurements either through electrical or acoustic emission approaches can be subjected to noises that arise from different sources. In this study, the examination on the denoising methods for electrical and acoustic…
View article: Effect of Moisture Content on Temperature Characteristics of Dielectric Breakdown Strength of Biodegradable Ester Oils
Effect of Moisture Content on Temperature Characteristics of Dielectric Breakdown Strength of Biodegradable Ester Oils Open
The authors showed in previous report that the relative moisture content of biodegradable ester oil increases with increasing temperature, which affects the AC breakdown voltage (BDV). This paper presents the dependence of BDV on moisture …
View article: Development of Innovative Functional Electrical Insulating Composites
Development of Innovative Functional Electrical Insulating Composites Open
Recently, a strong demand arises for improving functionality such as electrical insulation, thermal and mechanical properties of insulating polymer composites by filling a small amount of inorganic fillers instead of conventionally adding …
View article: Comparison of the Effect of Thermal Aging on Dielectric Properties of Vegetable Oils and Impregnated Kraft Paper
Comparison of the Effect of Thermal Aging on Dielectric Properties of Vegetable Oils and Impregnated Kraft Paper Open
In this paper, dielectric properties (BDV and permittivity) of two vegetable oils (Palm Fatty Acid Ester and FR3) used in power transformers are studied. Also, partial discharge inception voltage (PDIV) of Kraft paper impregnated with thes…
View article: Thermal Resistance and Transient Thermal Analysis of SiC Power Module Using Ni Micro Plating Bonding
Thermal Resistance and Transient Thermal Analysis of SiC Power Module Using Ni Micro Plating Bonding Open
This paper deals with the thermal resistance and thermal conduction characteristics of a Nickel Micro Plating Bonding (NMPB) power module in comparison with those of a power module adapting a conventional structure with a high-temperature …
View article: Study on static electrification of the PFAE-mineral oil mixture
Study on static electrification of the PFAE-mineral oil mixture Open
The natural ester of tri-ester type has been implemented on a high voltage large power transformer, rated at 420 kV, since 2014. The high voltage transformer is known prone to the static electrification risk. Palm fatty acid ester (PFAE) w…
View article: Effect of lightning impulse prestress on AC partial discharge characteristics in cast resin transformer
Effect of lightning impulse prestress on AC partial discharge characteristics in cast resin transformer Open
It is crucial for cast resin transformer to detect void and delamination existing in the cast resin because these defects reduce insulation performance of cast resin equipment. Furthermore, defects are likely to be mixed in cast resin beca…
View article: Properties of Thermally Aged Natural Esters Used as Insulating Liquid
Properties of Thermally Aged Natural Esters Used as Insulating Liquid Open
View article: PD Behaviors of Monoester Insulating Oil under Different Moisture Contents
PD Behaviors of Monoester Insulating Oil under Different Moisture Contents Open
One of the problems encounters in implementing vegetable oils (natural esters) as a transformer insulating oil is their viscosity which is high. To address this problem, monoester derived from vegetable oil was introduced. This paper deals…
View article: Simulation of Electrical Characteristics for Misalignment of Coil in Wireless Power Transfer System using Repeating Coil
Simulation of Electrical Characteristics for Misalignment of Coil in Wireless Power Transfer System using Repeating Coil Open
This paper compares the electrical characteristics of the S-P type and the repeating coil type wireless power transfer (WPT) system. The features of the two types of WPT systems are described if the output power is same value using the sam…
View article: High Accuracy Examination on Location Identification of Partial Discharge with Time of Flight Method in Power Module
High Accuracy Examination on Location Identification of Partial Discharge with Time of Flight Method in Power Module Open
The next-generation power devices are expected to be used in high voltage applications. And development of high-voltage power module has been promoted. The key issue in high-voltage power module is the existence of partial discharge (PD). …
View article: Study on the Control of Forming Microvaristor Chains in Epoxy Resin
Study on the Control of Forming Microvaristor Chains in Epoxy Resin Open
The composite of epoxy resin and microvaristors shows the non-linear voltage-current characteristics because it has the chains of microvaristors which are formed by applying an electric field and work as current paths. These chains should …