Capacitor for multiple replacement applications

A capacitor providing a plurality of selectable capacitance values, the capacitor comprising:

• A) a wound cylindrical capacitive element having six concentrically wound capacitor sections, each capacitor section having a capacitance value, the capacitor sections each having a respective section element terminal at a first end of the capacitive element, and the capacitor sections having a common element terminal at a second end of the capacitive element;
• B) six insulated capacitor section conductors, each capacitor section conductor connected at one end thereof to a respective section element terminal, and an insulated common conductor connected at one end thereof to the common element terminal of the capacitive element;
• C) a case having a substantially cylindrical sidewall, a bottom wall and an open top, the capacitive element and the section conductors and common conductor connected thereto received in the case with the common element terminal adjacent to the bottom wall of the case;
• D) an insulating fluid in said case, the fluid at least partially surrounding the capacitive element;
• E) a pressure interrupter cover assembly including:
• 1. a deformable substantially circular cover having a peripheral rim sealingly secured to the case and covering and closing the open top thereof,
• 2. a common cover terminal mounted to the deformable circular cover generally at the center thereof, the common cover terminal having at least two blades extending upwardly from the cover and a terminal post extending downwardly through the cover to a distal end,
• 3. six capacitor section cover terminals mounted to the deformable circular cover at spaced apart locations surrounding the common cover terminal, each capacitor section cover terminal having at least two blades extending upwardly from the cover and a terminal post extending downwardly through the cover to a distal end, and
• 4. a rigid disconnect plate supported under the cover, the rigid disconnect plate defining openings accommodating the terminal posts and exposing the distal ends thereof;
• and
• F) frangible connections adjacent the rigid disconnect plate connecting the other end of the common conductor to the terminal post of the common cover terminal and respectively connecting the other ends of the six capacitor section conductors to a corresponding terminal post of the six capacitor section cover terminals,
• whereby the capacitor may be connected to provide selected capacitance values in an electric circuit by attaching selected ones of the common cover terminal and capacitor section cover terminals to conductors of the electrical circuit, and outward deformation of the deformable cover caused by failure of the capacitor element breaks at least some of the frangible connections adjacent the rigid disconnect plate sufficient to disconnect the capacitive element from the electric circuit.

A capacitor providing a plurality of selectable capacitance values, the capacitor comprising:

• A) a wound cylindrical capacitive element having six concentrically wound capacitor sections each having a capacitance value, the capacitor sections each having a capacitor section terminal at a first end of the capacitive element and the capacitor sections having a common element terminal at a second end of the capacitor section, the capacitor section having the greatest capacitance value being one of the outer three capacitance sections of the capacitive element;
• B) six insulated capacitor section wires each connected at one end to a respective section terminal of the six capacitor sections, and an insulated common conductor connected at one end to the common element terminal of the capacitor element;
• C) a metal case having a cylindrical side wall, a bottom wall and an open top, the capacitive element and the insulated wires and insulated conductor connected thereto received in the case with the common element terminal adjacent to and insulated from the bottom wall thereof;
• D) an insulating fluid in said case at least partially surrounding the capacitive element;
• E) a pressure interrupter cover assembly including:
• 1. a deformable circular metal cover having a peripheral edge sealingly secured to the supper end of the case,
• 2. a common cover terminal mounted to the circular metal cover generally at the center thereof, the common cover terminal having a blade extending upwardly from the cover and a terminal post extending downwardly from the cover to a distal end,
• 3. six capacitor section cover terminals mounted to the circular metal cover at spaced apart positions surrounding the common cover terminal, each capacitor section cover terminal having at least two blades extending upwardly from the cover and a terminal post extending downwardly from the cover to a distal end thereof,
• 4. a cover insulation barrier mounted to the deformable metal cover, the cover insulation barrier including a barrier cup substantially surrounding the cover common terminal and barrier fins extending radially outwardly from the barrier cup and deployed between adjacent section cover terminals, and
• 5. a rigid disconnect plate supported under the deformable metal cover, the ridgid disconnect plate defining openings accommodating the terminal posts and exposing the distal ends thereof;
• and
• F) frangible connections adjacent the rigid disconnect plate connecting the terminal post of the common cover terminal to the conductor extending from the common element terminal, and frangible connections respectively connecting the other ends of the six capacitor section wires to a corresponding terminal post of the six capacitance section cover terminals;
• whereby selectable capacitance values are provided by connecting selected cover terminals to place the corresponding capacitive sections in one or more electric circuits and wherein outward deformation of the deformable metal cover caused by failure of the capacitive element breaks at least some of the frangible connections sufficient to disconnect the capacitive element from an electrical circuit established through the capacitance element by connections to the cover terminals.

An improvement in the capacitor of the type having a cylindrical metal case, a wound capacitive element and insulating fluid received in the case and a pressure interrupter cover assembly having a deformable metal cover, the improvement comprising:

• A) the capacitive element having at least five capacitor sections each having a section element terminal, and a common element terminal;
• B) a common cover terminal mounted generally centrally on the cover and at least five section cover terminals corresponding to the number of capacitor section mounted on the deformable cover surrounding and the common cover terminal and spaced apart from the common cover terminal and from adjacent section cover terminals;
• C) conductors connecting the common element terminal to the common cover terminal and conductors respectively connecting the section element terminals to the section cover terminals;
• and
• D) a cover insulation barrier assembly mounted to the deformable cover, the cover insulation barrier assembly having a barrier cup substantially surrounding the common cover terminal and barrier fins radially extending radially outwardly from the barrier cup and deployed at positions between adjacent section cover terminals.