High-voltage capacitors are key components for circuit breakers and monitoring and protection devices, and are important elements used to improve the efficiency and reliability of the grid. Different technologies are used in high-voltage capacitor manufacturing process, and at all stages of this process polymeric films must be used, along with an encapsulating material, which can be either liquid, solid or gaseous. These materials play major roles in the lifespan and reliability of components. In this paper, we present a review of the different technologies used to manufacture high-voltage capacitors, as well as the different materials used in fabricating high-voltage film capacitors, with a view to establishing a bibliographic database that will allow a comparison of the different technologies

A situation involving a polymer nanocomposite containing a large amount of inorganic filler was studied. An epoxy nanocomposite with a content of 20% wt of nanosilica was used. Emphasis was put on imaging at the nanoscale and some dielectric responses were measured using dielectric spectroscopy. Using Transmission Electron Microscopy (TEM) in a High-Angle Annular Dark Field (HAADF) scanning mode, an area of less than 4 nm around an isolated particle was imaged and found to have a very low atomic number. With Atomic Force Microscopy (AFM) in peak-force mode agglomerates were clearly imaged. With respect to the dielectric response, no interfacial relaxation peak was observed. In presence of some agglomeration, the real part of the permittivity was found to be decreased by the addition of the nanofiller. Higher-field measurements unravelled nonlinear variations of the conduction versus an applied field. It was shown that the use of a large filler concentration resulted in greater interphase overlapping between the nanoparticles.

No abstract

No abstract

International audienc