Pulsed interrupter and method of operation

• US 9,054,530 B2
• Filed: 04/25/2013
• Issued: 06/09/2015
• Est. Priority Date: 04/25/2013
• Status: Active Grant

• Current Assignee: General Atomics, Inc.
• Original Assignee: General Atomics, Inc.
• Inventors: Drake, Joel Lawton, Kratz, Robert
• Primary Examiner(s): BAUER, SCOTT ALLEN
• Application Number:
  US13/870,615
• Publication Number:
  US 20140321013A1
• Time in Patent Office: 775 Days
• Field of Search: 361/78, 361/2, 361/14
• US Class Current: 1/1
• CPC Class Codes: H01H 3/222 using electrodynamic repulsion
• CPC Class Codes: H01H 33/285 using electro-dynamic repulsion assisting the movement of pistons by accelerating coil H01H33/882
• CPC Class Codes: H01H 33/302 for fluid insulated switchgear, wherein the insulating fluid is also the working fluid
• CPC Class Codes: H01H 9/542 Contacts shunted by static switch means
• CPC Class Codes: H02H 3/26 responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents

Abstract

Some embodiments provide interrupter systems comprising: a first electrode; a second electrode; a piston movably located at a first position and electrically coupled with the first and second electrodes establishing a closed state, the piston comprises an electrical conductor that couples with the first and second electrodes providing a conductive path; an electromagnetic launcher configured to, when activated, induce a magnetic field pulse causing the piston to move away from the electrical coupling with the first and second electrodes establishing an open circuit between the first and second electrodes; and a piston control system comprising a piston arresting system configured to control a deceleration of the piston following the movement of the piston induced by the electromagnetic launcher such that the piston is not in electrical contact with at least one of the first electrode and the second electrode when in the open state.

Claims

1. An interrupter system, comprising:

a first electrode;

a second electrode;

a piston movably located at a first position and electrically coupled with both the first electrode and the second electrode establishing a closed state, wherein the piston comprises an electrical conductor that electrically couples with the first electrode and the second electrode providing an electrically conductive path between the first electrode and the second electrode when in the closed state;

an electromagnetic launcher configured to, when activated, induce a magnetic field pulse causing the piston to move away from the electrical coupling with the first electrode and the second electrode such that the electrical conductor is no longer electrically coupled with at least one of the first electrode and the second electrode and establishing an open circuit between the first electrode and the second electrode defining an open state; and

a piston control system comprising a piston arresting system cooperated with the piston and configured to control a deceleration of the piston following the movement of the piston induced by the electromagnetic launcher such that the piston is not electrically coupled with at least one of the first electrode and the second electrode when in the open state.

2. The interrupter system of claim 1, wherein the piston control system further comprises:

a closing system cooperated with the piston wherein the closing system is configured to return the piston to the first position to again be electrically coupled with both the first electrode and the second electrode.

3. The interrupter system of claim 2, wherein the piston arresting system is further configured to stop the movement of the piston at a second location following the movement of the piston induced by the electromagnetic launcher to cause the transition to the open state, and to latch the piston in the second position until induced to return to the first position by the closing system.

4. The interrupter system of claim 3, further comprising:

a chamber; and

an insulating gas;

wherein the arresting system is configured to use the chamber and the insulating gas, wherein the piston is movably positioned within the chamber such that the piston moves along the chamber from the first position toward the second position when induced by the electromagnetic launcher; and

wherein the insulating gas is configured to induce a pressure on the piston reducing a velocity of the piston resulting from the movement of the piston induced by the magnetic field pulse.

5. The interrupter system of claim 3, wherein the arresting system further comprises an integral friction element cooperated with the piston, and a friction contact that is separate from the piston and the integral friction element, wherein the integral friction element is configured to contact the friction contact during at least a portion of the movement of the piston induced by the electromagnet launcher and to stop the movement of the piston away from the first position.

6. The interrupter system of claim 2, wherein the piston control system comprises a latching system configured to latch the piston in the second position until the piston is induced to return to the first position by the closing system.

7. The interrupter system of claim 2, wherein the closing system comprises a gas pump cooperated with a chamber, wherein the piston is positioned within the chamber and the gas pump is configured to pump a gas into a portion of the chamber to induce movement of the piston to return the piston to the first position.

8. The interrupter system of claim 2, wherein the closing system comprises a linear actuator that when activated is configured to mechanically drive the piston to back to the first position.

9. The interrupter system of claim 1, further comprising:

a first chamber;

a second chamber; and

an insulating gas;

wherein the first chamber is cooperated with the second chamber such that the insulating gas flows between the first chamber and the second chamber as the piston moves between the first position and a second position, wherein the piston is not electrically coupled with at least one of the first electrode and the second electrode when in the second position and in the open state.

10. The interrupter system of claim 9, wherein the piston arresting system comprises a gas valve cooperated with the first chamber, wherein the gas valve is biased in a closed state sealing at least a portion of the insulating gas between the gas valve and the piston when the piston is in the first position, and wherein the gas valve is configured to open in response to an increase in pressure caused by the movement of the piston away from the first position as induced by the electromagnetic launcher such that at least some of the insulating gas passed from the first chamber to the second chamber.

11. The interrupter system of claim 9, wherein the piston control system further comprises:

a closing system cooperated with the piston, wherein the closing system comprises a gas pump cooperated with the first chamber and the second chamber, wherein the gas pump is configured to pump at least some of the insulating gas from the second chamber into the first chamber decreasing a pressure within the second chamber and increasing a pressure in the first chamber causing the piston to move from the second position to the first position.

12. The interrupter system of claim 1, further comprising:

a guard ring electrically coupled with the first electrode, wherein the guard ring comprises a conductive body formed in substantially a ring shape and is positioned to be electrically proximate to and extend circumferentially about at least a portion of the electrical conductor of the piston when the piston is in the first position.

13. The interrupter system of claim 1, further comprising:

a mechanical interrupter comprising the piston, the first chamber, the first electrode and the second electrode; and

an auxiliary circuit coupled in parallel with the mechanical interrupter.

14. The interrupter system of claim 1, further comprising:

a controller configured to control the electromagnetic launcher to induce the magnetic field pulse to induce the movement of the piston.

15. An interrupter system, comprising:

a first electrode;

a second electrode;

a piston movably located at a first position and electrically coupled with both the first electrode and the second electrode establishing a closed state, wherein the piston comprises an electrical conductor that electrically couples with the first electrode and the second electrode providing an electrically conductive path between the first electrode and the second electrode when in the closed state;

an impulse force launcher configured to, when activated, induce a force on the piston causing the piston to move away from the electrical coupling with the first electrode and the second electrode such that the electrical conductor is no longer electrically coupled with at least one of the first electrode and the second electrode and establishing an open circuit between the first electrode and the second electrode defining an open state; and

a piston control system comprising a piston arresting system cooperated with the piston and configured to control a deceleration of the piston following the movement of the piston induced by the impulse force launcher such that the piston is not electrically coupled with at least one of the first electrode and the second electrode when in the open state.

16. An interrupter system, comprising:

a first electrode;

a second electrode;

a first chamber; and

a piston movably positioned within the first chamber and configured to move along at least a portion of a length the first chamber;

wherein the piston comprises an electrical conductor configured to establish an electrically conductive path between the first electrode and the second electrode when the piston is in a first position providing a closed state, and the electrical conductor is further configured to induce movement of the piston along at least a portion of the length of the first chamber in response to an electromagnetic pulse causing the piston to move away from the first position such that the electrical conductor is no longer electrically coupled with at least one of the first electrode and the second electrode causing a transition from the closed state to an open state wherein there is no longer an electrically conductive path between the first electrode and the second electrode.

17. The interrupter system of claim 16, wherein the electrical conductor comprises an electrically conductive face at a first end of the piston, wherein the electrically conductive face comprises an electrically conductive material extending over at least a portion of a face of the piston and is electrically coupled with the first electrode and the second electrode when the piston is in the first position providing the closed state.

18. The interrupter system of claim 16, further comprising:

a gas within the first chamber, wherein the gas is configured to apply a pressure to the piston when the piston is in the first position to maintain the piston in the first position and electrically coupled with the first and second electrodes.

19. The interrupter system of claim 18, wherein the gas is further configured to be displaced by the movement of the piston in response to the electromagnetic pulse, and wherein the displaced gas is further configured to apply a pressure on the piston to maintain the piston away from the first position.

20. The interrupter of claim 19, further comprising:

a pump cooperated with the first chamber, wherein the pump is configured to pump the gas relative to the piston to induce a change in pressure about the piston inducing movement of the piston to return to the first position such that the electrical conductor is electrically coupled with both the first electrode and the second electrode reestablishing the closed state.

21. The interrupter system of claim 16, further comprising:

a latching system cooperated with the piston, wherein the latching system is configured to latch the piston in a second position separated by a first distance along the length of the first chamber from the first position maintaining the open state, wherein the piston when in the second position is not electrically coupled with at least one of the first electrode and the second electrode.

22. The interrupter system of claim 16, further comprising:

a guard ring electrically coupled with the first electrode, wherein the guard ring comprises a conductive body formed in substantially a ring shape and is positioned to be electrically proximate to and extend circumferentially about at least a portion of the electrical conductor of the piston when the piston is in the first position.

23. The interrupter system of claim 22, further comprising:

a first electrode contact electrically coupled with the first electrode, wherein the first electrode contact is configured to cooperate with and to contact the electrical conductor of the piston when the piston is in the first position establishing the electrical coupling between the electrical conductor and the first electrode, and wherein the guard ring is separated from the first electrode contact by a second distance.

24. The interrupter of claim 16, wherein the piston further comprises:

an integral friction element, wherein the integral friction element is configured to contact a portion of the first chamber during at least a portion of the movement of the piston induced in response to the electromagnetic pulse and to stop the movement of the piston away from the first position.

25. The interrupter of claim 16, further comprising:

an insulating gas contained within the first chamber, wherein the chamber is configured to re-circulate the insulating gas in response to the induced movement of the piston along at least the portion of the length of the first chamber in response to the electromagnetic pulse such that the insulating gas is replenished proximate a first electrical contact and a second electrical contact that contact and electrically couple the electrical conductor of the piston with the first electrode and the second electrode, respectively; and

wherein the insulating gas is configured to inhibit electric arcs across a separation between the first electrical contact and the second electrical contact.

26. An interrupter system, comprising:

a first electrode;

a second electrode;

a chamber;

a piston positioned within the chamber, wherein the piston comprises an electrical conductor configured to electrically couple with both the first electrode and the second electrode and to establish an electrical path between the first electrode and a second electrode when the piston is in a first position establishing a closed state, and wherein the piston is configured to move along at least a portion of the chamber such that the piston is no longer electrically coupled with at least one of the first electrode and the second electrode such that there is no longer an electrical path between the first electrode and the second electrode; and

a guard ring electrically coupled with the first electrode, wherein the guard ring comprises a conductive body formed in substantially a ring shape and is positioned to be electrically proximate to and extend circumferentially about at least a portion of the electrical conductor of the piston when the piston is in the first position.

27. The interrupter system of claim 26 wherein the guard ring is positioned to be indirectly electrically proximate to at least the portion of the electrical conductor of the piston and extend circumferentially about at least a portion of a conductive portion of the chamber that extends circumferentially about at least a portion of the electrical conductor of the piston when the piston is in the first position.

28. The interrupter system of claim 26 wherein the guard ring is positioned to be directly electrically proximate to at least the portion of the electrical conductor of the piston and extend circumferentially about at least the portion of a conductive portion of the chamber that extends circumferentially about at least a portion of the electrical conductor of the piston when the piston is in the first position.

29. The interrupter system of claim 26, wherein the guard ring is configured to balance capacitive coupling between a first electrode contact of the first electrode and a second electrode contact of the second electrode, wherein the first electrode contact and the second electrode contact are positioned to be in contact with and electrically coupled with the electrical conductor of the piston when the piston is in the first position.

30. The interrupter system of claim 29, wherein the guard ring is separated from the first electrode contact by a first distance.

31. An interrupter system, comprising:

a first electrode;

a second electrode;

a chamber;

a piston positioned within the chamber, wherein the piston is configured to electrically couple with both the first electrode and the second electrode establishing an electrical path between the first electrode and a second electrode when the piston is in a first position establishing a closed state, and wherein the piston is configured to move along at least a portion of the chamber such that the piston is no longer electrically coupled with at least one of the first electrode and the second electrode such that there is no longer an electrical path between the first electrode and the second electrode;

a gas within the chamber; and

a valve cooperated with the chamber, wherein the valve is biased closed and configured to open in response increased pressure on the gas caused by the movement of the piston away from the first position and to at least dissipate kinetic energy of the piston as it moves away from the first position.

32. The interrupter system of claim 31, further comprising:

a controller configured to induce the movement of the piston in response to threshold conditions.

33. A method of interrupting an electrical current, the method comprising:

positioning a piston comprising a conductor in a first position such that a conductor of the piston is in contact with electrical contacts providing a conductive path between a first electrode and a second electrode;

detecting a condition in excess of a threshold;

driving the piston away from the electrical contacts breaking the conductive path between the first electrode and the second electrode and establishing an open state;

controlling a deceleration of the piston as it is driven away from the electrical contacts; and

arresting movement of the piston at a second position separate from the first position such that the piston is not electrically coupled with at least one of the first electrode and the second electrode when in the second position while maintaining the piston in a position to be returned to the first position.

34. The method of claim 33, further comprising:

activating closing control to move the piston to return the piston to the first position such that the conductor of the piston contacts the electrical contacts and reestablishing the conductive path between the first electrode and the second electrode and the closed state.

35. The method of claim 34, wherein the activating the closing control comprises:

pumping a gas proximate the piston inducing an increased pressure on the piston and driving the piston back to the first position.

36. The method of claim 34, wherein the activating the closing control comprises:

activating an actuator to contact and move the piston back to the first position.

37. The method of claim 33, wherein the driving the piston away from the electrical contacts comprises:

inducing a magnetic field pulse proximate the piston causing the piston to move away from the electrical contacts establishing the open state.

38. The method of claim 33, wherein the controlling the deceleration of the piston comprises:

allowing a pressure, within a chamber in which the piston travels while being driven away from the first position, to increase as the piston travels along the chamber; and

controlling a release of pressure within the chamber as the pressure exceeds a threshold pressure caused by the movement of the piston along at least a portion of a length of the chamber as the piston is driven from the first position and along at least the portion of the length of the chamber.

39. The method of claim 38, further comprising:

redirecting gas released in response to the releasing of the pressure within the chamber causing an increase in pressure against the piston between the piston and the electrical contacts; and

preventing the piston from returning to the first position as a result of the increased pressure between the piston and the first electrical contact and the second electrical contact.

40. The method of claim 33, wherein the controlling the deceleration of the piston comprises inducing a friction force between the piston and a chamber in which the piston travels while being driven away from the first position.

41. A method of interrupting an electrical current, the method comprising:

positioning a piston in a first position electrically coupled with a first electrode and a second electrode with the piston establishing an electrically conductive path between the first electrode and the second electrode when in the first position providing a closed state;

inducing a magnetic field pulse proximate the piston while in the first position driving the piston away from the first position and the electrical coupling with the first electrode and the second electrode establishing an open state such that the piston is no longer electrically coupled with at least one of the first electrode and the second electrode and breaking the electrically conductive path between the first electrode and the second electrode; and

controlling movement of the piston as the piston is being driven away from the first position.

42. A method of interrupting an electrical current, the method comprising:

positioning a piston comprising a conductor in a first position such that the conductor of the piston is in contact with electrical contacts that are electrically coupled with first and second electrodes and providing a conductive path between the first electrode and a second electrode;

driving the piston away from the electrical contacts breaking the conductive path between the first electrode and the second electrode and establishing an open state; and

activating closing control to drive the piston to return the piston to the first position when a threshold condition is satisfied such that the conductor of the piston contacts the electrical contacts and reestablishing the conductive path between the first electrode and the second electrode and the closed state.