Research Interest:
- Dielectric properties of high voltage insulation material
- Partial discharge study, diagnostic and measurement in gas, liquid and solid dielectric
- Short circuit electromagnetic force and temperature rise analysis of busbar system
- Road Pavement energy harvesting
Current Research
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Breakdown characteristics of RBDPO- An alternative to mineral oil for liquid type power transformer
This research is focused on investigation of dielectric properties of Palm Oil as an insulating media in electrical power transformer. The types of palm oil used in the experiment are refined, bleached and deodorized palm oil (RBDPO). The dielectric strength of pure RBDPO and RBDPO/soybean oil (SO) mixture at various temperatures are investigated according the IEC 60156 std and compared with the mineral based oil.Figure 1 shows the oil test cell used for breakdown voltage test. The test cell has a volume capacityof 400 ml,consists of VDE electrodes with the gap of2.5 mm which in accordance to IEC 60156 standard. Figure 2 shows the result of breakdown characteristic of RBDPO and RBDPO/SO. The result revealed that the dielectric strength of pure RBDPO was relatively higher than that mineral based oil (shell diala B) at 40°C. The dielectric strength of RBDPO was 34.4 kV/mm which 4.3 time higher than that mineral based oil. 
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Electrical treeing in Silicone Rubber nanocomposite
This research investigates influence of Organo-Montmorillonite as nanofiller on electrical treeing in silicone rubber (SiR) based insulation. Electrical treeing experiments were conducted on pure SiR as well as nanocomposite samples of SiR and OMMT mixture. The result revealed that the silicone rubber nanocomposites inhibited and slowed down the growth of electrical treeing compared to unfilled silicone rubber. Figure 3 shows the experimental setup diagram consists of camera online monitoring system and the leaf-like specimen. Figure 4 shows typical image of the electrical treeing growth in the SiR nanocomposite captured by the CCD camera
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Road Pavement Energy Harvesting
In this research, the thermoelectric generator (TEG) system is applied into the pavement. The pavement and cooling system was prepared and designed by considering the place for inserting the thermoelectric module (TEM). The cooling system consists of two materials such as a heat sink and heat exchanger. The heat sink and heat exchanger are used to determine lower temperature at the bottom side of the TEG module. The investigation on I-V and P-V characteristics of the TEG application in road pavement is performed. Figure 5 shows the photograph of pavement construction with the TEG application exposed under the sun. Figure 6 shows the P-V characteristic of the TEG in road pavement
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Electromagnetic Force in Vertical and Horizontal Arrangement of Busbar System under Short-Circuit Current
Each conductor busbar is subjected to an electromagnetic force due to the short-circuit currents. The electromagnetic forces affected by the short-circuit current in rigid bare conductor busbar are calculated in vertical and horizontal arrangement. Short-circuit current values are calculated mathematically. The calculations of current are performed by assuming a peak value of steady-state ac current is equal to the peak value of the short-circuit current. Equation introduced by IEC Standards 865/1993 is applied in order to calculate short-circuit electromagnetic forces. The electromagnetic force generated in vertical arrangement is compared with the horizontal of busbar. The result depicted that the busbar in vertical arrangement has about 2 times higher electromagnetic force compared with that in horizontal arrangement. The calculation result is compared with simulation result that obtained using AC analysis by applying Maxwell Stress method in Opera-2D. The dimensional configuration of the busbar system obviously influences the strength of electromagnetic force due to short-circuit current. The maximum electromagnetic force declined about 4%-7% by increasing the configuration of busbar arrangement in thickness or central distance between conductors. Furthermore, the electromagnetic force obtained from the simulation by finite element method was agreed with the calculation obtained using IEC Standard 865/1993.