Vacuum interrupter arrangement for a medium voltage circuit breaker with cup-shaped TMF-contacts

1. A vacuum interrupter arrangement for a medium voltage circuit breaker comprising:

a vacuum housing that is cylindrically shaped within which a pair of electrical contacts can be coaxially arranged and concentrically surrounded by the vacuum housing,

wherein the electrical contacts can be formed as a type of transverse magnetic field(TMF)-contact, each having a slotted cup-shaped contact part which is attached to a distal end of a contact shaft and which is covered by a contact ring disposed on a rim of the cup-shaped contact part,

wherein each cup-shaped contact part is provided with a vertical inward bending towards the contact ring, wherein an outer diameter of a bottom section of the cup-shaped contact part is larger than an outer diameter of the rim of the cup-shaped contact part in order to alter a Lorentz force on a constricted columnar arc to a respective inward direction, and

wherein the vertical inward bending on the cup-shaped contact part is provided with a flat flange section of the cup-shaped contact part which is inwardly bent.

2. The vacuum interrupter arrangement according to claim 1 , wherein the contact ring has an outer diameter equal to a bottom area of the cup-shaped contact part.

3. The vacuum interrupter arrangement according to claim 1 , wherein each electrical contact is shaped as a single cup-type TMF-contact.

4. The vacuum interrupter arrangement according to claim 1 , wherein each electrical contact is shaped as a double-TMF contact system consisting of a discoid inner contact part and a surrounding outer cup-shaped contact part.

5. The vacuum interrupter arrangement according to claim 4 , wherein the inner contact part is spiral slotted.

6. A medium voltage circuit-breaker comprising:

at least one vacuum interrupter arrangement as claimed in claim 5 for at least one pole part operated by an electromagnetic actuator.

7. The vacuum interrupter arrangement according to claim 1 , wherein the vertical inward bending on the cup-shaped contact part is provided with a concave groove disposed in an inner wall of the flange section.

8. The vacuum interrupter arrangement according to claim 1 , wherein the vertical inward bending on the cup-shaped contact part is provided with a concave groove disposed in an outer wall of the flange section in an area of the rim.

9. The vacuum interrupter arrangement according to claim 8 , wherein an additional concave groove is disposed in an inner wall of the flange section in a bottom area of the cup-shaped contact part.

10. A vacuum interrupter arrangement for a medium voltage circuit breaker comprising:

a vacuum housing that is cylindrically shaped within which a pair of electrical contacts can be coaxially arranged and concentrically surrounded by the vacuum housing,

wherein the electrical contacts can be formed as a type of transverse magnetic field(TMF)-contact, each having a slotted cup-shaped contact part which is attached to a distal end of a contact shaft and which is covered by a contact ring disposed on a rim of the cup-shaped contact part,

wherein each cup-shaped contact part is provided with a vertical inward bending towards the contact ring, wherein an outer diameter of a bottom section of the cup-shaped contact part is larger than an outer diameter of the rim of the cup-shaped contact part in order to alter a Lorentz force on a constricted columnar arc to a respective inward direction, and

wherein the vertical inward bending on the cup-shaped contact part is provided with a concave groove disposed in an inner wall of a flange section of the cup-shaped contact part.

11. The vacuum interrupter arrangement according to claim 10 , wherein the flange section of the vertical inward bending on the cup-shaped contact part is flat and inwardly bent and is provided with a concave groove disposed in an outer wall of the flange section in an area of the rim.

12. The vacuum interrupter arrangement according to claim 11 , wherein an additional concave groove is disposed in the inner wall of the flange section in a bottom area of the cup-shaped contact part.

13. A vacuum interrupter arrangement for a medium voltage circuit breaker comprising:

a vacuum housing that is cylindrically shaped within which a pair of electrical contacts can be coaxially arranged and concentrically surrounded by the vacuum housing,

wherein the electrical contacts can be formed as a type of transverse magnetic field(TMF)-contact, each having a slotted cup-shaped contact part which is attached to a distal end of a contact shaft and which is covered by a contact ring disposed on a rim of the cup-shaped contact part,

wherein each cup-shaped contact part is provided with a vertical inward bending towards the contact ring, wherein an outer diameter of a bottom section of the cup-shaped contact part is larger than an outer diameter of the rim of the cup-shaped contact part in order to alter a Lorentz force on a constricted columnar arc to a respective inward direction, and

wherein the vertical inward bending on the cup-shaped contact part is provided with a concave groove disposed in an outer wall of a flange section of the cup-shaped contact part in an area of the rim.

14. The vacuum interrupter arrangement according to claim 13 , wherein an additional concave groove is disposed in an inner wall of the flange section in a bottom area of the cup-shaped contact part.