EP1192631A1 - Encapsulated magnetically actuated vacuum interrupter with integral bushing connector - Google Patents

Encapsulated magnetically actuated vacuum interrupter with integral bushing connector

Info

Publication number
EP1192631A1
EP1192631A1 EP00923348A EP00923348A EP1192631A1 EP 1192631 A1 EP1192631 A1 EP 1192631A1 EP 00923348 A EP00923348 A EP 00923348A EP 00923348 A EP00923348 A EP 00923348A EP 1192631 A1 EP1192631 A1 EP 1192631A1
Authority
EP
European Patent Office
Prior art keywords
interrupter
housing
flange
current
conductor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00923348A
Other languages
German (de)
French (fr)
Other versions
EP1192631A4 (en
EP1192631B1 (en
Inventor
William J. Book
Guenter Leonardt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Inc
Original Assignee
ABB Power T&D Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ABB Power T&D Co Inc filed Critical ABB Power T&D Co Inc
Publication of EP1192631A1 publication Critical patent/EP1192631A1/en
Publication of EP1192631A4 publication Critical patent/EP1192631A4/en
Application granted granted Critical
Publication of EP1192631B1 publication Critical patent/EP1192631B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5822—Flexible connections between movable contact and terminal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H01H2033/6665—Details concerning the mounting or supporting of the individual vacuum bottles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/027—Integrated apparatus for measuring current or voltage
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/6606—Terminal arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H01H33/6662—Operating arrangements using bistable electromagnetic actuators, e.g. linear polarised electromagnetic actuators

Definitions

  • the present invention relates to interrupter switch and transformer combinations used in power distribution systems and, more particularly, to the combination of a magnetically actuated vacuum interrupter switch and an oil-filled distribution transformer, the switch being for controlling power to the transformer or the loop connection through the transformer.
  • the apparatus includes a housing formed from insulating material and having a mounting flange formed along the exterior of the housing. The flange is located so that the housing extends away from the mounting side and the upper side of the flange.
  • An electrical current interrupter having electrical input and output ends, is positioned in the housing so that a portion lies within the portion of the housing extending away from the flange mounting side.
  • An actuator is mechanically connected to the interrupter to provide the mechanical actuation required to interrupt the current flow between the input and output ends of the interrupter.
  • the interrupter is either a vacuum interrupter or an interrupter filled with an insulating fluid such as SF 6 gas. It is also preferred for the actuator to be a magnetic actuator.
  • the housing comprises an arm member and a base member, preferably integrally formed.
  • a conductor is connected to the electrical output of the interrupter. It is especially preferred for the base member to be molded around a portion of the conductor. It is also preferred for a current sensor, such as a current transformer, to be positioned proximate the conductor for sensing the current flowing there through.
  • a flexible conductor prefferably electrically connected between the output end of the interrupter and the conductor.
  • an insulating rod is mechanically interconnected between the actuator and the output end of the interrupter.
  • Fig. 1 is a diagrammatic perspective view of an encapsulated magnetically actuated interrupter with integral bushing connector constructed in accordance with the invention
  • Fig. 2 is a diagrammatic perspective view of the encapsulated magnetically actuated interrupter with integral bushing connector shown in Fig. 1, from a different angle;
  • FIG. 3 is a diagrammatic perspective view of the encapsulated magnetically actuated interrupter with integral bushing connector shown in Fig. 1, from a different angle;
  • Fig. 4 is a side diagrammatic view of an alternate embodiment of the encapsulated magnetically actuated interrupter with integral bushing connector shown in Fig. 1 ;
  • Fig. 5 is a diagrammatic section view of an alternate embodiment of the encapsulated magnetically actuated interrupter with integral bushing connector shown in Fig. 1.
  • the invention also includes a magnetically driven actuator to drive the vacuum interrupter contacts "open” and "closed.”
  • a magnetically driven actuator to drive the vacuum interrupter contacts "open” and "closed.”
  • the use of a magnetic drive provides for improved reliability (fewer parts) and the ability to employ remote operation without the use of expensive, motor-driven spring charging mechanisms. Referring to Figs. 1, 2 and 3, an integrated interrupter device 10 is depicted.
  • Device 10 is shown to include a magnetic actuator 12, coupled via insulating rod 14 to vacuum interrupter 16.
  • Magnetic actuator 12 drives the arrangement.
  • the position of rod 14 as determined by the state of actuator 12 will cause interrupter 16 to be in either an opened or closed state.
  • interrupter 16 include an electrical input end 16a and an electrical output end 16b.
  • output end 16b will be an electrically conductive rod that extends into interrupter 16 and is caused by operation of actuator 12 to either make contact or break contact with a second rod forming a portion of electrical input 16a.
  • the opened or closed state of interrupter 16 will, in turn, either permit or interrupt the flow of current from a source (not shown).
  • the current path is from interrupter 16 through flexible conductor 30 and conductor 19 to bushing connector 22.
  • the flexible current path connector 30, of any suitable contemporary design, is included for permitting current flow in the presence of the axial movement of rod 14, i.e., the flexibility of connector 30 permits its mechanical attachment to rod 14 and its electrical attachment to the conductor (shown in Figs., 1, 2, 4 and 5) extending from actuator 16.
  • the interrupter and actuator are encapsulated in arm 18 and base 20, each being formed from solid dielectric material, preferably urethane, epoxy or other known electrically insulating material.
  • arm 18 and base 20 are integrally formed, preferably molded.
  • Bushing connector 22, also included within base 20, is preferably constructed similar to those connectors described in ANSI/IEEE Standard 386-1985 (Fig 3 for 200A interface or Fig 10 for 600A interface). It is noted that since rod 14 will exhibit axial movement and since flexible connector 30 will flex laterally, chambers of a size sufficient to permit such movement are formed in arm 18 and base 20.
  • a flange or mounting pad 28 is formed around a portion of base 20 and arm 18. As described below, flange 28 serves to mount device 10 onto another structure such as a container filled with insulating oil.
  • Device 10 is mounted to the sidewall 26 of a transformer by mounting pad 28.
  • sidewall 26 forms a part of an enclosure containing an insulating fluid such as mineral or silicone oil.
  • an insulating fluid such as mineral or silicone oil.
  • Such materials mineral and silicone oils are well suited to insulating and cooling purposes.
  • the single piece or molded construction of base 20 is also shown to include integrated current and voltage sensors, such as current sensor 24, for both line sensing and self-powering (not shown).
  • a loop feeder tap 32 is provided in the molded construction as an extension of conductor 19 for a loop-feed connection through wall 26 and into the transformer.
  • magnetic actuator 12 can be of any particular form, it is desirable to utilize the magnetic actuator disclosed in co-pending patent application 08/794,491 filed February 4, 1997 entitled MOLDED POLE AUTOMATIC CIRCUIT RECLOSER WITH BISTABLE ELECTROMAGNETIC ACTUATOR, incorporated herein by reference.
  • the device 10 also includes connection points for control devices (most likely in the air compartment).
  • Fig. 4 depicts an alternative embodiment of device 10, in which a different magnetic actuator is utilized.
  • the magnetic actuator is contained within arm 18.
  • actuator 12 was mounted to the end of arm 18.
  • connector 30a is connected to conducting rods 19a and 19b.
  • a current or voltage sensor 40 is positioned to surround conducting rod 19b to detect the current passing there through.

Landscapes

  • Connector Housings Or Holding Contact Members (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
  • Fluid-Driven Valves (AREA)
  • Measuring Fluid Pressure (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Transformer Cooling (AREA)
  • External Artificial Organs (AREA)

Abstract

Apparatus (10) for interrupting the flow of current in a power distribution system is disclosed for use with an enclosure containing insulating fluid. The apparatus (10) includes a housing (20) formed from insulating material and having a mounting flange (28) formed along the exterior of the housing (20). The flange (28) is located so that the housing extends away from the mounting side and the upper side of the flange. An electrical current interrupter (16), having electrical input and output ends (16a, 16b), is positioned in the housing (20) so that a portion lies within the portion of the housing extending away from the flange mounting side. An actuator (12) is mechanically connected to the interrupter (16) to provide the mechanical actuation required to interrupt the current flow between the input and output ends of the interrupter. When the flange (28) is attached to the enclosure, the portion of the housing (20) extending away from the flange mounting side extends into the fluid within the enclosure.

Description

ENCAPSULATED MAGNETICALLY ACTUATED
VACUUM INTERRUPTER WITH
INTEGRAL BUSHING CONNECTOR
Field of the Invention The present invention relates to interrupter switch and transformer combinations used in power distribution systems and, more particularly, to the combination of a magnetically actuated vacuum interrupter switch and an oil-filled distribution transformer, the switch being for controlling power to the transformer or the loop connection through the transformer.
Background of the Invention
When interrupting current to an inductive load, an arc can form between the separating switch contacts. For many years, the practice in the electrical power distribution industry has been the use of loadbreak switching in which contact arcing generated during current interruption physically occurs in an insulating fluid contained within an enclosure. However, the fluids historically in use, such as mineral and silicone oils, are limited in their arc-quenching capabilities. The existence and process of extinguishing the arc causes a breakdown of the insulating medium. In general, when arcing occurs physically within the insulating oil, contamination of the oils results from the formation of by-products. Moreover, gas is generated which acts to raise the system pressure. Venting the enclosure containing insulating oil may be required. Such venting adds to the complexity of the enclosure design. However, liquids are advantageous because of their low cost, ready availability and ease of handling and storage.
Unlike oil, there are no by-products resulting from arc in vacuum or an enclosure containing SF6 gas. Any by-products, formed as a result of arcing in SF6 gas, tend to recombine into the gas after a short period of cooling. No harmful residues are left in the system. No insulation is lost and no venting is required.
Consequently, a need exists for an interrupter that has the insulating characteristics of oil and which does not suffer from disadvantages resulting from the formation of by-products. Summary of the Invention
The foregoing disadvantages of fluid degradation during switching are overcome by apparatus for interrupting the flow of current in a power distribution system for use with an enclosure containing insulating fluid. The apparatus includes a housing formed from insulating material and having a mounting flange formed along the exterior of the housing. The flange is located so that the housing extends away from the mounting side and the upper side of the flange. An electrical current interrupter, having electrical input and output ends, is positioned in the housing so that a portion lies within the portion of the housing extending away from the flange mounting side. An actuator is mechanically connected to the interrupter to provide the mechanical actuation required to interrupt the current flow between the input and output ends of the interrupter. When the flange is attached to the enclosure, the portion of the housing extending away from the flange mounting side extends into the fluid within the enclosure.
Preferably, the interrupter is either a vacuum interrupter or an interrupter filled with an insulating fluid such as SF6 gas. It is also preferred for the actuator to be a magnetic actuator.
In one embodiment the housing comprises an arm member and a base member, preferably integrally formed. A conductor is connected to the electrical output of the interrupter. It is especially preferred for the base member to be molded around a portion of the conductor. It is also preferred for a current sensor, such as a current transformer, to be positioned proximate the conductor for sensing the current flowing there through.
It is also preferred for a flexible conductor to be electrically connected between the output end of the interrupter and the conductor. In such an embodiment, an insulating rod is mechanically interconnected between the actuator and the output end of the interrupter.
Brief Description of the Drawings
The present invention will be better understood, and its numerous objects and advantages will become apparent by reference to the following detailed description of the invention when taken in conjunction with the following drawings, in which: Fig. 1 is a diagrammatic perspective view of an encapsulated magnetically actuated interrupter with integral bushing connector constructed in accordance with the invention;
Fig. 2 is a diagrammatic perspective view of the encapsulated magnetically actuated interrupter with integral bushing connector shown in Fig. 1, from a different angle;
Fig. 3 is a diagrammatic perspective view of the encapsulated magnetically actuated interrupter with integral bushing connector shown in Fig. 1, from a different angle; Fig. 4 is a side diagrammatic view of an alternate embodiment of the encapsulated magnetically actuated interrupter with integral bushing connector shown in Fig. 1 ; and
Fig. 5 is a diagrammatic section view of an alternate embodiment of the encapsulated magnetically actuated interrupter with integral bushing connector shown in Fig. 1.
Detailed Description of the Preferred Embodiments
The prior disadvantages of fluid degradation during switching is moderated or nullified in distribution transformers in accordance with the invention by a new system of enclosing small vacuum interruptor switches and their interconnections within larger tanks filled with a conventional insulating and cooling mineral oil. This combination of two insulating systems obtains the maximum benefits of both while minimizing the shortcomings of both for their specific applications. All of the advantages of load switching in a vacuum are retained while the industry-standard bushings and conductors, and the switching modules themselves, are insulated and cooled by the long established benefits and economy of mineral oil liquid.
The invention also includes a magnetically driven actuator to drive the vacuum interrupter contacts "open" and "closed." The use of a magnetic drive provides for improved reliability (fewer parts) and the ability to employ remote operation without the use of expensive, motor-driven spring charging mechanisms. Referring to Figs. 1, 2 and 3, an integrated interrupter device 10 is depicted.
Device 10 is shown to include a magnetic actuator 12, coupled via insulating rod 14 to vacuum interrupter 16. Magnetic actuator 12 drives the arrangement. To that end, it is noted that the position of rod 14 as determined by the state of actuator 12 will cause interrupter 16 to be in either an opened or closed state. It is noted that no particular interrupter is necessary to practice the invention, however, it is desirable that interrupter 16 include an electrical input end 16a and an electrical output end 16b. When interrupter 16 is mechanically actuated, by operation of magnetic actuator 12 and insulating rod 18, the flow of current between 16a and 16b will either be interrupted or permitted to flow. Typically output end 16b will be an electrically conductive rod that extends into interrupter 16 and is caused by operation of actuator 12 to either make contact or break contact with a second rod forming a portion of electrical input 16a. The opened or closed state of interrupter 16 will, in turn, either permit or interrupt the flow of current from a source (not shown). When current is permitted to flow, the current path is from interrupter 16 through flexible conductor 30 and conductor 19 to bushing connector 22. The flexible current path connector 30, of any suitable contemporary design, is included for permitting current flow in the presence of the axial movement of rod 14, i.e., the flexibility of connector 30 permits its mechanical attachment to rod 14 and its electrical attachment to the conductor (shown in Figs., 1, 2, 4 and 5) extending from actuator 16.
The interrupter and actuator are encapsulated in arm 18 and base 20, each being formed from solid dielectric material, preferably urethane, epoxy or other known electrically insulating material. As depicted in Fig. 1, 2 and 3, arm 18 and base 20 are integrally formed, preferably molded. Bushing connector 22, also included within base 20, is preferably constructed similar to those connectors described in ANSI/IEEE Standard 386-1985 (Fig 3 for 200A interface or Fig 10 for 600A interface). It is noted that since rod 14 will exhibit axial movement and since flexible connector 30 will flex laterally, chambers of a size sufficient to permit such movement are formed in arm 18 and base 20. A flange or mounting pad 28 is formed around a portion of base 20 and arm 18. As described below, flange 28 serves to mount device 10 onto another structure such as a container filled with insulating oil.
Device 10 is mounted to the sidewall 26 of a transformer by mounting pad 28. In a preferred embodiment, sidewall 26 forms a part of an enclosure containing an insulating fluid such as mineral or silicone oil. Such materials (mineral and silicone oils) are well suited to insulating and cooling purposes. By immersing a portion of interrupter 16 into such fluid, any arcing occurring within the interrupter can be insulated and cooled by the oil. Moreover, either by filling interrupter 16 with an insulating fluid such as SF6 gas or by forming a vacuum therein, the risk of harmful degradation has been minimized. In this way, the benefits of each medium can be utilized.
The single piece or molded construction of base 20 is also shown to include integrated current and voltage sensors, such as current sensor 24, for both line sensing and self-powering (not shown). A loop feeder tap 32 is provided in the molded construction as an extension of conductor 19 for a loop-feed connection through wall 26 and into the transformer.
Although the magnetic actuator 12 can be of any particular form, it is desirable to utilize the magnetic actuator disclosed in co-pending patent application 08/794,491 filed February 4, 1997 entitled MOLDED POLE AUTOMATIC CIRCUIT RECLOSER WITH BISTABLE ELECTROMAGNETIC ACTUATOR, incorporated herein by reference.
The device 10 also includes connection points for control devices (most likely in the air compartment).
Fig. 4 depicts an alternative embodiment of device 10, in which a different magnetic actuator is utilized. In this embodiment, the magnetic actuator is contained within arm 18. In the Fig. 1 embodiment, actuator 12 was mounted to the end of arm 18. Referring now to Fig. 5, yet another embodiment of device 10 is shown. In this embodiment, connector 30a is connected to conducting rods 19a and 19b. A current or voltage sensor 40 is positioned to surround conducting rod 19b to detect the current passing there through.
The advantages of this device are numerous: 1) clean interruption by eliminating arching in the oil, 2) reliable operation through the use of magnetic actuators which contain a minimal number of moving parts, 3) flexibility (with the addition of control devices of varying degrees of sophistication the device can perform the duties of a loadbreak switch, resettable fuse, recloser and circuit breaker) and 4) the integration of bushing connector 22 makes the unit compact and eliminates manual joint connections necessary in present day solutions. Although the present invention has been described in relation to particular embodiments thereof, many other variations and modifications and other uses will become apparent to those skilled in the art. It is preferred, therefore, that the present invention be limited not by the specific disclosure herein, but only by the appended claims.

Claims

What is claimed is:
1. Apparatus for interrupting the flow of current in a power distribution system, said apparatus adapted for use with an enclosure containing insulating fluid, said apparatus comprising: a housing formed from insulating material; a flange formed along the exterior of said housing, said flange having a mounting side and an upper side and said flange being located on said housing so that said housing extends away from said mounting side and said upper side; an interrupter, having electrical input and output ends for interrupting the flow of current between said input and output ends in response to mechanical actuation, said interrupter being positioned in said housing so that a portion of said interrupter lies within the portion of said housing extending away from said mounting side; and an actuator, mechanically connected to said interrupter to provide said mechanical actuation, wherein when said flange is attached to said enclosure the portion of said housing extending away from said mounting side extends into said enclosure.
The apparatus of Claim 1 , wherein said interrupter is a vacuum interrupter.
The apparatus of Claim 1, wherein said interrupter is filled with an insulating fluid.
The apparatus of Claim 3, wherein said fluid is SF6 gas.
5. The apparatus of Claim 1 , wherein said actuator is a magnetic actuator.
6. The apparatus of Claim 1, wherein said housing comprises an arm member and a base member.
7. The apparatus of Claim 6, wherein said arm and base members are integrally formed.
8. The apparatus of Claim 1, further comprising a conductor connected to the electrical output of said interrupter and a bushing connector electrically connected to said conductor, wherein said base member is molded around a portion of said conductor and said bushing connector.
9. The apparatus of Claim 8, further comprising a current sensor positioned proximate said conductor for sensing the current flowing there through.
10. The apparatus of Claim 9, wherein said current sensor comprises a current transformer.
11. The apparatus of Claim 9 further comprising a flexible conductor electrically connected between said output end of said interrupter and said conductor.
12. The apparatus of Claim 1, further comprising an insulating rod for mechanically interconnecting said actuator and said interrupter.
EP00923348A 1999-04-13 2000-04-13 Encapsulated magnetically actuated vacuum interrupter with integral bushing connector Expired - Lifetime EP1192631B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US12900499P 1999-04-13 1999-04-13
US129004P 1999-04-13
PCT/US2000/010028 WO2000062319A1 (en) 1999-04-13 2000-04-13 Encapsulated magnetically actuated vacuum interrupter with integral bushing connector

Publications (3)

Publication Number Publication Date
EP1192631A1 true EP1192631A1 (en) 2002-04-03
EP1192631A4 EP1192631A4 (en) 2004-11-03
EP1192631B1 EP1192631B1 (en) 2008-06-25

Family

ID=22438038

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00923348A Expired - Lifetime EP1192631B1 (en) 1999-04-13 2000-04-13 Encapsulated magnetically actuated vacuum interrupter with integral bushing connector

Country Status (6)

Country Link
EP (1) EP1192631B1 (en)
AT (1) ATE399365T1 (en)
DE (1) DE60039298D1 (en)
ES (1) ES2307506T3 (en)
HK (1) HK1047350A1 (en)
WO (1) WO2000062319A1 (en)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE758825C (en) * 1938-08-24 1952-11-04 Aeg Load switching device for step transformers
FR1372250A (en) * 1962-10-19 1964-09-11 Ass Elect Ind Selector Switch Improvements
FR1396115A (en) * 1964-05-22 1965-04-16 Ass Elect Ind Improvements to service tap change transformers
JPS5118609B1 (en) * 1968-03-13 1976-06-11
GB1268401A (en) * 1968-05-30 1972-03-29 English Electric Co Ltd Improvements in or relating to electrical distribution circuits and distribution units therefor
US4171474A (en) * 1977-05-27 1979-10-16 Electric Power Research Institute, Inc. Current interrupter electrode configuration
US4267415A (en) * 1977-10-06 1981-05-12 Electric Power Research Institute Current limiter vacuum envelope
US5059753A (en) * 1987-11-06 1991-10-22 Cooper Industries, Inc. SF6 puffer recloser
US5597992A (en) * 1994-12-09 1997-01-28 Cooper Industries, Inc. Current interchange for vacuum capacitor switch
US5661280A (en) * 1995-08-02 1997-08-26 Abb Power T&D Company Inc. Combination of a gas-filled interrupter and oil-filled transformer
US5793008A (en) * 1996-11-01 1998-08-11 Eaton Corporation Vacuum interrupter with arc diffusing contact design

Also Published As

Publication number Publication date
EP1192631A4 (en) 2004-11-03
ATE399365T1 (en) 2008-07-15
EP1192631B1 (en) 2008-06-25
ES2307506T3 (en) 2008-12-01
HK1047350A1 (en) 2003-02-14
DE60039298D1 (en) 2008-08-07
WO2000062319A1 (en) 2000-10-19

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