A sealed and impregnated wound capacitor assembly (10, 20, 30, 40, 50, 60, 70, 80, 100 or 110) comprising: at least one wound capacitor (90 or 90') having a conductor and insulation windings; a first and second electrodes (12 and 14; 22 and 24; 32 and 34; 42 and 44; 52 and 54; or 62 and 64), the first and second electrodes respectively connected to opposing ends (90a and 90b) of each of the at least one wound capacitor (90 or 90') to form an electrical connection between each end of the at least one wound capacitor (90 or 90') and the respective first or second electrode; one or more fill ports forming a fluid dielectric flow path into a sealed annular region; an insertable seal fitting (19, 29, 39, 49, 59 or 69) sealing the fluid dielectric flow path; and a fluid dielectric disposed between the conductor and insulation windings of each one of the at least one wound capacitor (90 or 90') by vacuum impregnation of the fluid dielectric supplied to the sealed annular region via the one or more fill ports prior to sealing the fluid dielectric flow path with the insertable seal fitting; characterized by an enclosure (18, 28, 38, 48, 58, 68, 78, 88 or 108) surrounding the exterior length of each one of the at least one wound capacitor (90 or 90'), the enclosure forming the sealed annular region (S 1, S 2, S 3, S 4 or S 5) between the interior of the enclosure, the fill port entry of the one or more fill ports disposed in the first and second electrodes and the exterior of the length of each one of the at least one wound capacitor; the one or more fill ports forming a fluid dielectric flow path into the sealed annular region (S 1, S 2, S 3, S 4 or S 5). at least one wound capacitor (90 or 90') having a conductor and insulation windings; a first and second electrodes (12 and 14; 22 and 24; 32 and 34; 42 and 44; 52 and 54; or 62 and 64), the first and second electrodes respectively connected to opposing ends (90a and 90b) of each of the at least one wound capacitor (90 or 90') to form an electrical connection between each end of the at least one wound capacitor (90 or 90') and the respective first or second electrode; one or more fill ports forming a fluid dielectric flow path into a sealed annular region; an insertable seal fitting (19, 29, 39, 49, 59 or 69) sealing the fluid dielectric flow path; and a fluid dielectric disposed between the conductor and insulation windings of each one of the at least one wound capacitor (90 or 90') by vacuum impregnation of the fluid dielectric supplied to the sealed annular region via the one or more fill ports prior to sealing the fluid dielectric flow path with the insertable seal fitting; an enclosure (18, 28, 38, 48, 58, 68, 78, 88 or 108) surrounding the exterior length of each one of the at least one wound capacitor (90 or 90'), the enclosure forming the sealed annular region (S 1, S 2, S 3, S 4 or S 5) between the interior of the enclosure, the fill port entry of the one or more fill ports disposed in the first and second electrodes and the exterior of the length of each one of the at least one wound capacitor; the one or more fill ports forming a fluid dielectric flow path into the sealed annular region (S 1, S 2, S 3, S 4 or S 5).