Development of a >1 kV power/energy capacitor for >300/spl deg/C operation

An electronic power capacitor system capable of operating at >300/spl deg/C was developed that is based on commercial mica paper-aluminum foil in pressurized N/sub 2/. Single windings were used to develop an effective processing and conditioning procedure. Evaluation was based on life tests at 325-335/spl deg/C with applied DC voltage stress. A full-size, 2.4 /spl mu/F unit, consisting of a stack of 7 windings was life tested at with 2.0 kV/sub dc/ applied.