Silicone rubber composites filled with nano-silica are currently widely used as high voltage insulating materials in power transmission and substation systems. We present a systematic study on the dielectric and mechanical performance of silicone rubber filled with surface modified and unmodified fumed nano-silica. The results indicate that the different interfaces between the silicone rubber and the two types of nano-silica introduce changes in their dielectric response when electrically stressed by a sinusoidal excitation in the frequency range of 10⁻⁴–1 Hz. The responses of pure silicone rubber and the composite filled with modified silica can be characterized by a paralleled combination of Maxwell-Wagner-Sillars interface polarization and DC conduction. In contrast, the silicone rubber composite with the unmodified nano-silica exhibits a quasi-DC (Q-DC) transport process. The mechanical properties of the composites (represented by their stress-strain characteristics) reveal an improvement in the mechanical strength with increasing filler content. Moreover, the strain level of the composite with a modified filler is improved.

As DC transmission voltage increases, the DC wall bushing becomes longer, and a supporting insulator is introduced to keep the conductor straight. Under extremely high electric fields coupled with a thermal gradient, the surface charge of the supporting insulator may distort the field distribution and increase the risk of flashover. In this paper, surface potentials of three model epoxy resin composites were systematically investigated under varied voltage amplitudes, different voltage polarities and electric field distributions. The bulk and surface resistivity of the epoxy resin composites over a broad temperature range were measured to reveal the correlations between surface charge and such basic electrical parameters. The results indicate that the normal-dominated electric field plays the major role in charge accumulation. The processes of surface charge accumulation and dissipation are more closely related to the surface resistivity. As a result, the surface charge properties can be improved by optimizing the electrode structure and resistivity of the epoxy resin composites.

Biaxially oriented polypropylene (BOPP) is a current state of the art polymer dielectric for energy storage capacitor application with a limiting operational temperature of 85 °C. But for applications like downhole oil and gas characterization, aerospace application, hybrid and electrical vehicles, polymer dielectrics with stable and high energy density at temperatures greater than

Biaxially oriented polypropylene (BOPP) is a current state of the art polymer dielectric for energy storage capacitor application with a limiting operational temperature of 85 °C. But for applications like downhole oil and gas characterization, aerospace application, hybrid and electrical vehicles, polymer dielectrics with stable and high energy density at temperatures greater than

Biaxially oriented polypropylene (BOPP) is a current state of the art polymer dielectric for energy storage capacitor application with a limiting operational temperature of 85 °C. But for applications like downhole oil and gas characterization, aerospace application, hybrid and electrical vehicles, polymer dielectrics with stable and high energy density at temperatures greater than

Biaxially oriented polypropylene (BOPP) is a current state of the art polymer dielectric for energy storage capacitor application with a limiting operational temperature of 85 °C. But for applications like downhole oil and gas characterization, aerospace application, hybrid and electrical vehicles, polymer dielectrics with stable and high energy density at temperatures greater than