One of the issues of using cross-linked Polyethylene (XLPE) in DC insulation systems is the propensity of crosslinking byproducts to promote charge buildup inside the insulation, leading potentially to insulation failure. Field-induced ionization of the molecules, like in insulating liquids, is thought to be one of the processes of charge generation. In this paper, space charge measurement is realized to probe the effect of cumyl alcohol as one of the crosslinking byproducts. Low Density Polyethylene (LDPE) is used as polymer matrix, and soaked in cumyl alcohol. We show that polyethylene naphthalate (PEN) layers constitute efficient barriers to the evaporation of cumyl alcohol from LDPE films. The space charge behavior of soaked LDPE is compared to that of reference LDPE with PEN. Significant charge build-up occurs at the LDPE/PEN interfaces due to the conductivity gradient. PEN appears not suited for such analysis as the field is concentrated in the layer and is weak in the bulk LDPE.
Biodiesel fuel has been applied to diesel cars for more than ten years and used on power application (turbines, boilers, etc.) recently in whole or blended with fossil fuels. The advantage of using biofuels as a renewable source is the significant reduction of greenhouse gas emissions. This study investigates the possibility of using biodiesel for gas turbine power plant in Indonesia through fuel testing analysis. Some biodiesel produced from four separated factories has been selected as samples for analyzing and then comparing to the fuel specification of three different gas turbine technologies located in Tello, Belawan and Gresik. It is found that no B20 biodiesel meet the requirements of fuel specification from all gas turbine technologies. This study recommends standardizing B20 biodiesel in Indonesia in order to be suitable with the fuel specification of gas turbines. In addition, some technical issues has been proposed to be further research. It is also recommended to do a pilot project using appropriate biodiesel at some gas turbines technologies on operation mode within life cycle cost analysis.
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