Hybrid current path for circuit breakers
A conductor arrangement for a circuit breaker interrupter, the conductor arrangement including: a tubular body conductor including a first metal material, and an at least partly tubular contact conductor including a second metal material; wherein a tubular end portion of the tubular body conductor is mechanically and electrically joined with a tubular end portion of the tubular contact conductor in an circumferential overlap region formed by longitudinally press-fitting one of the tubular body conductor and the tubular contact conductor into the other one of the tubular body conductor and the tubular contact conductor, wherein the outer one of the tubular end portions of the tubular body conductor and the at least partly tubular contact conductor at the overlap region includes copper and the inner one includes aluminum.
1. A conductor arrangement for a circuit breaker interrupter, the conductor arrangement comprising:
a tubular body conductor comprising a first metal material; and
a contact conductor comprising a second metal material, the contact conductor being at least partly tubular,
a tubular end portion of the tubular body conductor being mechanically and electrically joined with a tubular end portion of the contact conductor in a circumferential overlap region formed by longitudinally press-fitting one of the tubular body conductor and the contact conductor into the other one of the tubular body conductor and the contact conductor, an outer one of the tubular end portion of the tubular body conductor and the tubular end portion of the contact conductor at the overlap region including copper and an inner one of the tubular end portion of the tubular body conductor and the tubular end portion of the contact conductor at the overlap region including aluminum.
2. The conductor arrangement according to claim 1 , wherein dimensions of the tubular end portion of the tubular body conductor and the tubular end portion of the contact conductor are such that the outer one of the tubular end portion of the tubular body conductor and the tubular end portion of the contact conductor is expanded radially and the inner one of the tubular end portion of the tubular body conductor and the tubular end portion of the contact conductor is compressed as a result of the longitudinal press-fitting.
3. The conductor arrangement according to claim 1 , wherein a thermal expansion coefficient of the inner one of the tubular end portion of the tubular body conductor and the tubular end portion of the contact conductor in the overlap region is larger than a thermal expansion coefficient of the outer one of the tubular end portion of the tubular body conductor and the tubular end portion of the contact conductor in the overlap region.
4. The conductor arrangement according to claim 1 , wherein the tubular body conductor is produced from press-forming a tube of one of copper and aluminum and the contact conductor is produced from press-forming of tubes of the other of copper and aluminum.
5. The conductor arrangement according to claim 1 , wherein the first metal material is aluminum and the second metal material is copper.
6. The conductor arrangement according to claim 1 , wherein the contact conductor comprises longitudinal contact members on an opposite side from the tubular end portion, the longitudinal contact members being formed in one piece with the tubular end portion and extending longitudinally away from the tubular end portion.
7. The conductor arrangement according to claim 6 , wherein the longitudinal contact members are producible by press-forming.
8. The conductor arrangement according to claim 1 , wherein a length of the overlap region is substantially larger than a thickness of any one of the tubular body conductor and the contact conductor in the overlap region.
9. The conductor arrangement according to claim 1 , wherein the tubular end portion of the tubular body conductor comprises a fitting portion having smaller diameter than a neighboring portion, where at least part of the fitting portion is included in the overlap region.
10. The conductor arrangement according to claim 1 , comprising an arcing contact holder flange adapted to hold an arcing contact pin for the circuit breaker interrupter, wherein the arcing contact holder flange is attached inside and along an inner circumference of the tubular body conductor by radially compressing the tubular body conductor onto the arcing contact holder flange.
11. The conductor arrangement according to claim 10 , wherein the arcing contact holder flange comprises radially protruding attachment members adapted to permanently deform an inner surface of the tubular body conductor when the tubular body conductor is radially compressed onto the arcing contact holder flange.
12. The conductor arrangement according to claim 1 , wherein the conductor arrangement comprises a conductor assembly for the circuit breaker interrupter, wherein the conductor assembly comprises:
the tubular body conductor comprising the first metal material, and
an arcing contact holder flange comprising a third metal material and being adapted to hold an arcing contact pin for the circuit breaker interrupter, wherein the arcing contact holder flange is attached inside and along an inner circumference of the tubular body conductor by radially compressing the tubular body conductor onto the arcing contact holder flange.
13. The conductor arrangement according to claim 12 , wherein the first metal material is softer than the third metal material.
14. A method for manufacturing a conductor path for a circuit breaker interrupter, the method comprising:
press-forming a first tube made from a first metal material to form a tubular body conductor comprising a tubular end portion;
press-forming a second tube made from a second metal material to form a tubular contact conductor comprising a tubular end portion and longitudinal contact members on an opposite side from the tubular end portion, the longitudinal contact members being adapted for making electric contact with an external contact; and
pressing the tubular body conductor and the tubular contact conductor against each other in a longitudinal direction of the tubular body conductor and the tubular contact conductor so that an overlap region is produced where the tubular body conductor and the tubular contact conductor are mechanically and electrically connected to each other, wherein an outer one of the tubular end portion of the tubular body conductor and the tubular end portion of the tubular contact conductor at the overlap region comprises copper and an inner one of the tubular end portion of the tubular body conductor and the tubular end portion of the tubular contact conductor at the overlap region comprises aluminum.
15. The method according to claim 14 , wherein pressing the tubular body conductor and the tubular contact conductor against each other causes the outer one of the tubular end portion of the tubular body conductor and the tubular end portion of the tubular contact conductor to expand radially and the inner one of the tubular end portion of the tubular body conductor and the tubular end portion of the tubular contact conductor to be compressed.
16. The method according to claim 14 , wherein a thermal expansion coefficient of the inner one of the tubular end portion of the tubular body conductor and the tubular end portion of the tubular contact conductor in the overlap region is larger than the thermal expansion coefficient of the outer one of the tubular end portion of the tubular body conductor and the tubular end portion of the tubular contact conductor in the overlap region.
17. A circuit breaker interrupter comprising
an arcing contact pin; and
a conductor arrangement comprising:
a tubular body conductor comprising a first metal material; and
a contact conductor comprising a second metal material, the contact conductor being at least partly tubular,
a tubular end portion of the tubular body conductor being mechanically and electrically joined with a tubular end portion of the contact conductor in a circumferential overlap region formed by longitudinally press-fitting one of the tubular body conductor and the contact conductor into the other one of the tubular body conductor and the contact conductor, an outer one of the tubular end portion of the tubular body conductor and the tubular end portion of the contact conductor at the overlap region including copper and an inner one of the tubular end portion of the tubular body conductor and the tubular end portion of the contact conductor at the overlap region including aluminum.
18. The circuit breaker interrupter according to claim 17 , wherein dimensions of the tubular end portion of the tubular body conductor and the tubular end portion of the contact conductor are such that the outer one of the tubular end portion of the tubular body conductor and the tubular end portion of the contact conductor is expanded radially and the inner one of the tubular end portion of the tubular body conductor and the tubular end portion of the contact conductor is compressed as a result of the longitudinal press-fitting.
19. The circuit breaker interrupter according to claim 17 , wherein the conductor arrangement further comprises an arcing contact holder flange adapted to hold the arcing contact pin, wherein the arcing contact holder flange is attached inside and along an inner circumference of the tubular body conductor by radially compressing the tubular body conductor onto the arcing contact holder flange.
20. The circuit breaker interrupter according to claim 19 , wherein the arcing contact holder flange comprises radially protruding attachment members adapted to permanently deform an inner surface of the tubular body conductor when the tubular body conductor is radially compressed onto the arcing contact holder flange.