Palm kernel shells have a high mechanical strength and good insulation strength. From these results it can be concluded that breakdown voltage of epoxy resin/palm kernel shells is higher than pure resin or resin/alumina. The highest breakdown voltage that occurred in the resin/palm kernel shells (8 wt%) is 76 kV. While the highest breakdown voltage that occurred in the epoxy resin/alumina (17 wt%) is 57.15 kV. Breakdown voltages of both samples are higher than the pure epoxy resin of 36 kV. The maximum electric field density (Emax) in the pure resin is 0.24 MV/cm that is lower than the resin/palm kernel shell (8 wt%) of 0.51 MV/cm and the resin/alumina (17 wt%) of 0.38 MV/cm. Discharge current has a lot of pulses and high amplitude when all solid insulation approached the breakdown event. However, the current pulses in the pure resin are higher than in both resin/palm kernel shell and resin/alumina. The epoxy resin mixture with palm kernel shells can be used as a new solid insulator.
Department of Electrical Engineering, Universitas Riau, Indonesia
SuraMadu bridge as one of the bridge on Madura have a strategic function. Due to the rapid population growth on Madura, the people require a strategic and cheap electricity for industrial development especially in the region of Surabaya and Madura. The purpose of measuring the depth of the seafloor and ocean currents on strait of Madura is to know the contour of the seabed and the speed of ocean currents around the masts of the SuraMadu bridge of Madura. To measure the depth of a seabed and the ocean currents at a various points from SuraMadu Bridge are required to predict the characteristics of the ocean. The results showed the depth of the waters and the speed of ocean currents in the research area around the SuraMadu bridge ranges from 12 meters up to 15 meters with sea current velocity between 0.3 m /s² up to 1.6 m /s². The research method used the case study method. This research is conducted covering activity of location survey. Furthermore, bathymetry data analysis and processing bathymetry data analysis are performed.
Indonesia Hydrodynamics Laboratory, BPPT, Indonesia
