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Ceramic insulator is widely used in Indonesian electrical power distribution system. Based on previous research, it is obtained that silicone rubber coating can improve the performance of ceramic insulator due to better hydrophobicity. This paper presents performance of ceramic insulator with and without silicone rubber coating in a coastal area of Pangandaran. 6 silicone rubber coated and 6 uncoated of 20 kV distribution insulators have been installed in the field to get natural aging process for 5 years and 4 months. Along the aging process, their surface properties have been checked periodically. Monitored parameters are magnitude of leakage current, THD, hydrophobicity, and surface temperature of insulator. The result has shown that after 5 years and 4 months aging in coastal area without maintenance, silicone rubber coated ceramic insulator has better performance.

The electrical properties of Metal Insulator Semiconductor (MIS) structure comprise of carbon-based thin film grown on γ-Al2O3/Si have been studied. The carbon based thin film is deposited by using DC unbalanced magnetron sputtering using Fe doped carbon pellet as a target. Electrical properties of this structure have been analyzed through I-V characteristics measurements using cross-sectional electrode configurations. In-plane I-V measurement confirms the electrical conductivity of carbon layer is higher than Al2O3. The role of carbon thin film has been investigated by comparing the I-V characteristic of MIS structure with and without carbon thin film. Carbon layer and interface states of carbon/γ-Al2O3 have a significant contribution to enhance the cross-sectional current density. A simple energy band diagram model and theoretical calculation have been developed to further analyze this I-V characteristics data. This study is expected to be an alternative way to support the realization of future carbon-based electronic devices.