Review of Technologies and Materials Used in High-Voltage Film Capacitors

Abstract

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

Electrospinning Synthesis of Na0.5Bi0.5TiO3 Nanofibers for Dielectric Capacitors in Energy Storage Application

“…Dielectric composites composed of ceramic fillers and polymer matrix have the characteristics of high dielectric constant, high breakdown strength, and flexibility. In recent years, some researchers have been paying attention to the exploitation of composites for a dielectric capacitor with high energy storage density and energy efficiency [ 8 , 9 , 10 , 11 , 12 , 13 , 14 ].…”

Dry-type High Voltage Capacitors

“…They are used either as coupling or capacitive voltage dividers, in electrical sub-stations, circuit breakers, for monitoring and protection devices, as well as to improve grid efficiency and reliability. For high voltage application, the most common technology is the wound foil-laminar configuration [1,2] with coils connected in series and typically impregnated in oil in order to ensure the dielectric integrity and suppress any potential void that could lead to partial discharge (PD) activities in service as these devices operate at relatively high geometrical electrical stresses (35 kV/mm). However, although current HV capacitors impregnated with synthetic oil have a high electrical reliability, the use of oil, particularly synthetic oil, raises some concern as they could potentially be forbidden for either environmental or safety issues.…”

“…One of the possible candidates is lowviscosity impregnating epoxy resin appropriate for Vacuum Pressure Impregnation (VPI) process, and prior reports have shown the potential of this technology [3,4]. 1 In order to evaluate the feasibility of dry-type capacitors with a rated voltage of 1.5 kV per coil (corresponding to about 40 kV/mm) an investigation was carried out on both the optimization of the processing parameters and the electrical performance of such capacitors. The replacement of oil in the capacitor by a suitable thermosetting resin system without reducing the electrical performances is a challenging task and requires a lot of re-engineering and re-design.…”

Application of Numerical Simulation for Metallized Film Capacitors Electrodes Design

“…Depending on the dielectric material, there are three main types of capacitors used in the above-mentioned areas: polymer film, ceramic, and electrolytic. Compared to the ceramic and electrolytic capacitors, metalized polymer film capacitors (MFC) are cost-effective, suitable for high voltage [3], and degrade by a "graceful" aging mechanism primarily caused by the self-healing ability. The design of MFCs is well known.…”

“…The design of MFCs is well known. In the general case, MFC consists of two metallized polymer films, which are wound on a mandrel, forming a cylindrical capacitance element [3]. There are single-and multi-element capacitors.…”