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The behaviors of creeping streamers progressed in a narrow gap between two solid dielectric plates immersed in palm fatty acid ester (PFAE) oil have been investigated using ±1.2/50 μs and ±1.2/1000 μs lightning impulse voltages with ±140 kVpeak in maximum. It is shown that the growth of positive and negative streamers and the flashover voltage are affected by two interfaces between solid dielectrics,...
Mineral oil has predominantly been used as the insulation and cooling liquid in transformer industry for more than 100 years. However, with the concern of fire safety and environmental impact alternative liquids such as ester fluids are of interest. In fact, these liquids are biodegradable, less flammable and have been used in thousands of distribution transformers world-wide. A trend has been seen...
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