US3567885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isolator switch with bridging resistance and extinguishing gas control
Assignee: COQ NV
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Filing: 1968-08-19
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Granted: 1971-03-02
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Expires: 1988-08-19
Abstract
Abstract A gas blast circuit-breaker for isolating purposes and switching normal loads only, comprising a fixed main contact, a movable main contact cooperating therewith and two cooperating movable arcing contacts, of which the first one is rigidly connected with the movable main contact and the second one is electrically connected with the fixed main contact and is adapted to move, during the switching-off operation, together and in contact with the first arcing contact till a little past the separation of the main contacts, said second arcing contact being formed as a nozzle contact, the passage of which is opened during the switching-off operation as to allow extinguishing gas to escape from the switching chamber to quench the switching arc set up between the arcing contacts after their separation.
Inventors
- 👤 Rintje Boersma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:08
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/70; H01H33/80; H01H33/82; H01H33/02; H01H33/04; H01H33/12; H01H33/16; H01H33/166; H01H33/28; H01H33/30; H01H33/302
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
376 words
An isolator switch for high voltage electrical systems adapted to make and break normal currents, said switch comprising a switching chamber filled with pressurized extinguishing gas, a fixed main contact, a movable main contact cooperating with said fixed contact, means for driving the movable contact through a predetermined stroke from and towards said fixed contact, a first movable arcing contact secured to and electrically conductively connected with said movable main contact, a tubular second movable arcing contact cooperating with said first arcing contact and electrically conductively connected with said fixed main contact, means for driving said second arcing contact through a predetermined stroke in directions toward and from said first arcing contact, the stroke of the second arcing contact being smaller than the stroke of the movable main contact and the first arcing contact, a fixed intermediate contact also cooperating with said movable main contact and situated in the space between the main contacts when the isolator switch is in its open condition, a bridging resistance connected between said intermediate contact and said fixed main contact, said tubular second arcing contact forming a discharge passage for the extinguishing gas, and two cooperating valve members, one valve member being associated with the second arcing contact and the other member being associated with a stationary part of the isolator switch, said valve members constituting together a valve which keeps said discharge passage closed, both when the isolator switch is in its closed and in its definite open condition, and opens said discharge passage during the switching-off operation, all of said contacts being accommodated in said switching chamber, all of said movable contacts being driven simultaneously from their closed positions during the switching-off operation and the second arcing contact being returned to its closed position shortly after having reached the other end of its stroke, the stroke of the second arcing contact having such a length that during the switching-off operation the arcing contacts are separated after the movable main contact has left the intermediate contact and during the switching-in operation the movable main contact is brought into contact with the intermediate contact before the first arcing contact is brought into contact with the second arcing contact, so that said bridging resistance becomes operative only during the switchingin operation.
Claim 2
Dependent Claim
376 words
An isolator switch for high voltage electrical systems adapted to make and break normal currents, said switch comprising a switching chamber filled with pressurized extinguishing gas, a fixed main contact, a movable main contact cooperating with said fixed contact, means for driving the movable contact through a predetermined stroke from and towards said fixed contact, a first movable arcing contact secured to and electrically conductively connected with said movable main contact, a tubular second movable arcing contact cooperating with said first arcing contact and electrically conductively connected with said fixed main contact, means for driving said second arcing contact through a predetermined stroke in directions toward and from said first arcing contact, the stroke of the second arcing contact being smaller than the stroke of the movable main contact and the first arcing contact, a fixed intermediate contact also cooperating with said movable main contact and situated in the space between the main contacts when the isolator switch is in its open condition, a bridging resistance connected between said intermediate contact and said fixed main contact, said tubular second arcing contact forming a discharge passage for the extinguishing gas, and two cooperating valve members, one valve member being associated with the second arcing contact and the other member being associated with a stationary part of the isolator switch, said valve members constituting together a valve which keeps said discharge passage closed, both when the isolator switch is in its closed and in its definite open condition, and opens said discharge passage during the switching-off operation, all of said contacts being accommodated in said switching chamber, all of said movable contacts being driven simultaneously from their closed positions during the switching-off operation and the second arcing contact being returned to its closed position shortly after having reached the other end of its stroke, the stroke of the second arcing contact having such a length that during the switching-off operation the arcing contacts are separated after the movable main contact has left the intermediate contact and during the switching-in operation the movable main contact is brought into contact with the intermediate contact before the first arcing contact is brought into contact with the second arcing contact, so that said bridging resistance becomes operative only during the switchingin operation.
Claim 3
Dependent Claim
364 words
An isolator switch for high voltage electrical systems comprising, in combination; a switch body defining a switching chamber filled with pressurized extinguishing gas; first and second main contacts within said chamber; first and second arcing contacts electrically conductively connected respectively to said first and second main contacts; means for moving said first main contact selectively from a closed position in which said first main contact engages said second main contact to an opened condition in which said first main contact is spaced from said second main contact and vice versa; a bridging resistance contact spaced from aid second main contact such that said first main contact is spaced therefrom in said opened position thereof but electrically engages same while out of contact with said second main contact during movement of said first main contact both to its opened condition and to its closed position; bridging resistance means electrically connecting said bridging resistance contact to said second main contact; first actuating means for maintaining said arcing contacts in contact with each other during opening movement of said first main contact until said first main contact has cleared said bridging resistance contact whereby the electrical circuit between said first and said second main contacts is maintained by said arcing contacts until said first main contact has cleared said bridging resistance contact; second actuating means for moving one of said arcing contacts to separate said arcing contacts after said first main contact has cleared said bridging resistance contact during opening movement of said first main contact; said one arcing contact being of tubular form defining a discharge passage adapted to convey extinguishing gas to the region of an arc drawn between said arching contacts; valve means opened and closed respectively by operation of said first and second actuating means to control flow of extinguishing gas through said discharge passage whereby said flow of extinguishing gas occurs only incidental to opening movement of said isolator switch; and said second actuator means being effective relatively position said arcing contacts when the isolator switch is opened so that said first main contact engages said bridging contact before said arcing contacts engage during subsequent closing movement of said first main contact.
Claim 4
Dependent Claim
364 words
An isolator switch for high voltage electrical systems comprising, in combination; a switch body defining a switching chamber filled with pressurized extinguishing gas; first and second main contacts within said chamber; first and second arcing contacts electrically conductively connected respectively to said first and second main contacts; means for moving said first main contact selectively from a closed position in which said first main contact engages said second main contact to an opened condition in which said first main contact is spaced from said second main contact and vice versa; a bridging resistance contact spaced from aid second main contact such that said first main contact is spaced therefrom in said opened position thereof but electrically engages same while out of contact with said second main contact during movement of said first main contact both to its opened condition and to its closed position; bridging resistance means electrically connecting said bridging resistance contact to said second main contact; first actuating means for maintaining said arcing contacts in contact with each other during opening movement of said first main contact until said first main contact has cleared said bridging resistance contact whereby the electrical circuit between said first and said second main contacts is maintained by said arcing contacts until said first main contact has cleared said bridging resistance contact; second actuating means for moving one of said arcing contacts to separate said arcing contacts after said first main contact has cleared said bridging resistance contact during opening movement of said first main contact; said one arcing contact being of tubular form defining a discharge passage adapted to convey extinguishing gas to the region of an arc drawn between said arching contacts; valve means opened and closed respectively by operation of said first and second actuating means to control flow of extinguishing gas through said discharge passage whereby said flow of extinguishing gas occurs only incidental to opening movement of said isolator switch; and said second actuator means being effective relatively position said arcing contacts when the isolator switch is opened so that said first main contact engages said bridging contact before said arcing contacts engage during subsequent closing movement of said first main contact.
Claim 5
Dependent Claim
79 words
The isolator switch according to claim 2 wherein said first arcing contact is connected to and movable with said first main contact, said second arcing contact is of tubular form, said first actuator means moves said second arcing contact from a rest position to follow and remain in contact with said first arcing contact until said first main contact has cleared said bridging resistance contact, and said second actuator means rEturns said second arcing contact to its rest position.
Claim 6
Dependent Claim
44 words
The isolator switch as defined in claim 3 wherein said valve means is formed by one end of said second arcing contact and a fixed portion of said isolator switch which are in contact when said second arcing contact is in its rest position.
Claim 7
Dependent Claim
54 words
The isolator switch according to claim 2 wherein said first main contact is of tubular form, said second main contact and said bridging resistance contact are of annular form, said first arcing contact is connected fixedly to and centrally disposed within said first main contact, an said second arcing contact is of tubular form.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |