Self-blast circuit breaker with control body

• US 20080135523A1
• Filed: 02/08/2008
• Published: 06/12/2008
• Est. Priority Date: 08/10/2005
• Status: Abandoned Application

• Current Assignee: ABB Research Ltd. (ABB Limited)
• Original Assignee: ABB Research Ltd. (ABB Limited)
• Inventors: Niemeyer, Lutz, Seeger, Martin
• Application Number:
  US12/068,671
• Publication Number:
  US 20080135523A1
• Time in Patent Office: Days
• US Class Current: 218/149
• CPC Class Codes: H01H 33/182 using permanent magnets H01H33/187 takes precedence
• CPC Class Codes: H01H 33/7023 characterised by an insulating tubular gas flow enhancing nozzle H01H33/7038 takes precedence
• CPC Class Codes: H01H 33/7069 characterised by special dielectric or insulating properties or by special electric or magnetic field control properties H01H33/7023 - H01H33/7061 take precedence
• CPC Class Codes: H01H 33/7076 characterised by the use of special materials H01H33/7023 - H01H33/7069 take precedence
• CPC Class Codes: H01H 33/98 the flow of arc-extinguishing fluid being initiated by an auxiliary arc or a section of the arc, without any moving parts for producing or increasing the flow H01H33/901 takes precedence

Abstract

In a self-blast circuit breaker, the inner contact is equipped with a control body which extends into or against the outer contact, respectively. The control body forces the arc into an arcing zone in the form of a hollow cylinder. This achieves a more rapid pressure build up as a result of which the provision of the extinction chamber of the circuit breaker with extinguishing gas can be improved. The gas flow out of and into the arcing zone can be optimized by suitable shaping of the control body.

Claims

1. A self-blast circuit breaker with an inner contact and an outer contact, wherein the outer contact is arranged around a center axis of the inner contact, wherein, with the circuit breaker switched on, the outer contact is in contact with a contact area of the inner contact, wherein, for interrupting the circuit breaker, the inner contact and/or the outer contact can be moved along an axis, in such a manner that an arcing zone is produced between the contacts, and with an extinction chamber which is in contact with the arcing zone via at least one extinction duct, in such a manner, that gas can be moved to and fro between the arcing zone and the extinction chamber, wherein at the inner contact, a control body insulated from the contacts is arranged which extends from the contact area of the inner contact along the axis toward or into the outer contact, respectively, and wherein the arcing zone extends around the control body, wherein the control body has a first section having a first diameter and a second section having a second diameter different than the first diameter, wherein the second section is arranged on a side of the first section facing the inner contact, in such a manner that when the circuit breaker is interrupted, first the second section and then the first section reaches a mouth of the extinction duct.

2. The self-blast circuit breaker as claimed in claim 1, wherein when the circuit breaker is interrupted, the extinction duct opens into the arcing zone arranged around the control body.

3. The self-blast circuit breaker as claimed in claim 1, wherein the control body has a third section having a third diameter which is smaller than the second diameter, wherein the third section is arranged on a side of the second section facing the inner contact.

4. The self-blast circuit breaker as claimed in claim 1, wherein an outside of the control body is of synthetic material, particularly PTFE.

5. The self-blast circuit breaker as claimed in claim 1, wherein an outside of the control body consists of the same material as an inside of a circuit breaker body surrounding the arcing zone.

6. The self-blast circuit breaker as claimed in claim 1, characterized by a magnetic field source for generating a magnetic field in the arcing zone, wherein the magnetic field has a radial component with respect to the axis in the arcing zone, in such a manner that charged particles in the arc can be deflected transversely with respect to the axis by means of the magnetic field.

7. The self-blast circuit breaker as claimed in claim 1, wherein a material having a dielectric constant of ε

>

>

1, particularly a ferroelectric material, is arranged in the control body.

8. The self-blast circuit breaker as claimed in claim 1, wherein in the control body, at least one discharge duct for supplying and/or removing gas into/out of the arcing zone is arranged.

10. The self-blast circuit breaker as claimed in claim 2, wherein the control body has a third section having a third diameter which is smaller than the second diameter, wherein the third section is arranged on a side of the second section facing the inner contact.

11. The self-blast circuit breaker as claimed in claim 3, wherein an outside of the control body is of synthetic material, particularly PTFE.

12. The self-blast circuit breaker as claimed in claim 4, wherein an outside of the control body consists of the same material as an inside of a circuit breaker body surrounding the arcing zone.

13. The self-blast circuit breaker as claimed in claim 5, characterized by a magnetic field source for generating a magnetic field in the arcing zone, wherein the magnetic field has a radial component with respect to the axis in the arcing zone, in such a manner that charged particles in the arc can be deflected transversely with respect to the axis by means of the magnetic field.

14. The self-blast circuit breaker as claimed in claim 6, wherein a material having a dielectric constant of ε

>

>

1, particularly a ferroelectric material, is arranged in the control body.

15. The self-blast circuit breaker as claimed in claim 7, wherein in the control body, at least one discharge duct for supplying and/or removing gas into/out of the arcing zone is arranged.

9. A self-blast circuit breaker with an inner contact and an outer contact, wherein the outer contact is arranged around a center axis of the inner contact, wherein, with the circuit breaker switched on, the outer contact is in contact with a contact area of the inner contact, wherein, for interrupting the circuit breaker, the inner contact and/or the outer contact can be moved along an axis, in such a manner that an arcing zone is produced between the contacts, and with an extinction chamber which is in contact with the arcing zone via at least one extinction duct, in such a manner, that gas can be moved to and fro between the arcing zone and the extinction chamber, wherein at the inner contact, a control body insulated from the contacts is arranged which extends from the contact area of the inner contact along the axis toward or into the outer contact, respectively, and wherein the arcing zone extends around the control body, wherein in the control body, at least one discharge duct for supplying and/or removing gas into/out of the arcing zone is arranged.