Power capacitor device having voltage stress grading plane

Claim 1

A POWER CAPACITOR DEVICE COMPRISING A CASING HAVING AT LEAST ONE HIGH VOLTAGE TERMINAL DISPOSED THEREON, A CAPACITOR SECTION SUBASSEMBLY DISPOSED IN SAID CASING, SAID SECTION SUBASSEMBLY INCLUDING A PLURALITY OF COMPRESSED SECTIONS WOUND FROM FOIL AND INSULATIVE INTERLEAVING TO FORM RESPECTIVE CAPACITIVE CIRCUITS, MEANS CONNECTING SAID SECTION CAPACITIVE CIRCUITS IN A DEVICE CIRCUIT, AT LEAST SOME OF SAID SECTIONS HAVING WOUND HIGH VOLTAGE FOIL MEANS, AN ASSEMBLED SECTION SURFACE FORMED BY ENDS OF SAID SECTIONS, A CONDUCTOR DISPOSED ALONG SAID SECTION SURFACE SO AS TO PROVIDE AN EQUIPTENTIAL PLANE WHICH GRADES ANY ELECTRIC FIELD APPLIED BETWEEN SAID FOIL MEANS AND SAID CASING, INSULATIVE MEANS DISPOSED ABOUT SAID CONDUCTOR, AND MEANS FOR HOLDING SAID CONDUCTOR AT A POTENTIAL INTERMEDIATE TO THE POTENTIAL OF SAID TERMINAL AND SAID CASING.