High voltage capacitor with high energy density

A regenerating capacitor comprising in combination:

• first and second metallic foils;
• and
• a dielectric, including aramide fibers, providing a regenerating capacity, interposed therebetween,
• whereby said capacitor is operative at elevated temperatures up to 250.degree. C.

An elementary capacitor having an energy density within a range of about 0.5 J/cm.sup.3 to slightly greater than 2 J/cm.sup.3 for energy accumulation, discharge, commutation and filtering, comprising in combination

• dielectric foil means and two electrically conductive armatures separated by said dielectric foil means,
• said dielectric foil means and said conductive armatures being rolled up, so as to constitute a rolled-up capacitor
• said capacitor having an operating rated voltage in the range of between 0.5 KV and 10 KV and an electric energy accumulation capacity of between 10 J and at least 500 J, and being impregnated with a liquid dielectric, and wherein said dielectric foil means includes first and second dielectric foils,
• wherein each armature coacts with said first and second dielectric foils, each armature being formed by a metallization, and having a surface resistance of between 2 and 30 Ohms and being applied to said second dielectric foil,
• said second dielectric foil being made of a fibrous support, providing a regenerating capacity, and being superimposed on said first dielectric foil so that the capacitor takes the form of a regenerating (self-curing) capacitor,
• each of said first and second dielectric foils having a predetermined thickness and being arranged in a layer so that said first and second dielectric foils separate said conductive armatures,
• said first and second dielectric foils, said predetermined dielectric foil thickness, and said liquid dielectric being selected so that the ratio between the strength of an electric field associated with the applied operating voltage, and the disruptive strength associated with each of said dielectric foils is substantially equal for each of said first and second dielectric foils at least over a major voltage range within said rated voltage.

An elementary capacitor having an energy density within a range of about 0.5 J/cm.sup.3 to slightly greater than 2 J/cm.sup.3 for energy accumulation, discharge, commutation and filtering, comprising in combination

• dielectric foil means and two electrically conductive armatures separated by said dielectric foil means,
• said dielectric foil means and said conductive armatures being rolled up so as to constitute a rolled-up capacitor;
• said capacitor having an operating rated voltage in the range of between 0.5 KV and 10 KV and an electric energy accumulation capacity of between 10 J and at least 500 J, and being impregnated with a liquid dielelectric, and wherein said dielectric foil means includes first and second dielectric foils,
• wherein each armature coacts with said first and second dielectric foils, each armature being formed by a metallization, and having a surface resistance of between 2 and 30 Ohms and being applied to said second dielectric foil,
• said second dielectric foil being made of a fibrous support, providing a regenerating capacity, and being superimposed on said first dielectric foil so that the capacitor takes the form of a regenerating (self-curing) capacitor,
• each of said first and second dielectric foils having a predetermined thickness and being arranged in a layer so that said first and second dielectric foils separate said conductive armatures,
• said first and second dielectric foils, said predetermined dielectric foil thicknesses and said liquid dielectric being selected so that the ratio between the strength of an electric field associated with the applied operating voltage, and the disruptive strength associated with each of said dielectric foils is substantially equal for each of said first and second dielectric foils at least over a major voltage range within said rated voltage,
• wherein said rolled up conductive armatures are constituted by a plurality of winding turns, wherein said first dielectric foil includes a plastic film, and said fibrous support of said second dielectric foil includes metallized paper, and wherein said wound-up capacitor has lateral faces covered with conductive coats establishing a connection to respective of said armatures.

A capacitor having an energy density within a range of about 0.5 J/cm.sup.3 to slightly greater than 2 J/cm.sup.3 for energy accumulation, discharge, commutation and filtering, comprising in combination

• dielectric foil means and two electrically conductive armatures separated by said dielectric foil means,
• said discharge capacitor having an operating rated voltage in the range of between 8 KV and 20 KV and an electric energy accumulation capacity of between 10 J and 500 J, and being impregnated with a liquid dielelectric, and wherein said dielectric foil means includes first and second dielectric foils,
• wherein each armature coacts with said first and second dielectric foils, respectively, each armature being formed by a metallization, and having a surface resistance of between 2 and 30 Ohms and being applied to said second dielectric foil,
• said second dielectric foil being made of a fibrous support, providing a regenerating capacity, and being superimposed on said first dielectric foil so that the capacitor takes the form of a regenerating (self-curing) capacitor,
• each of said first and second dielectric foils having a predetermined thickness and being arranged so that at least two layers of said first dielectric foil with a layer of said second dielectric foil interposed between said at least two layers of said first dielectric foil separate said conductive armatures,
• all of said layers and armatures being wound up, and the so obtained rolled-up capacitor being covered on lateral faces thereof with conductive coats establishing an electrical connection to respective of said armatures,
• said first and second dielectrics, said predetermined dielectric foil thicknesses, and said liquid dielectric being selected so that the ratio between the strength of an electric field associated with the applied operating voltage, and the disruptive strength associated with each of said dielectric foils is substantially equal for each of said first and second dielectric foils at least over a major voltage range within said rated voltage.