US3094601A - Operating device for the movable contact of the main braking gap in an air blast circuit breaker - Google Patents
Operating device for the movable contact of the main braking gap in an air blast circuit breaker Download PDFInfo
- Publication number
- US3094601A US3094601A US141431A US14143161A US3094601A US 3094601 A US3094601 A US 3094601A US 141431 A US141431 A US 141431A US 14143161 A US14143161 A US 14143161A US 3094601 A US3094601 A US 3094601A
- Authority
- US
- United States
- Prior art keywords
- movable contact
- piston
- air
- movable
- blast valve
- 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.)
- Expired - Lifetime
Links
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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
- H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
- H01H33/80—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve
- H01H33/82—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve the fluid being air or gas
- H01H33/83—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve the fluid being air or gas wherein the contacts are opened by the flow of air or gas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
- H01H3/52—Driving mechanisms, i.e. for transmitting driving force to the contacts with means to ensure stopping at intermediate operative positions
Definitions
- My invention relates to air blast circuit breakers, and more specifically relates to a novel pneumatic operating mechanism for operating the blast valve and movable contact of an air blast circuit breaker wherein the movable contact and its cooperating stationary contact are contained within a high pressure air container.
- a source of operating pressure is then connected to the space between the air blast valve operating piston and movable contact operating piston which, when exposed to high pressure air, causes these two pistons to move away from one another to open the air blast valve and to assist the opening of the movable contact thereby imparting higher operating speed to the movable contact.
- the volume on the opposite side of the blast valve operating piston is then caused to communicate with open air through the cylinder which carries the movable contact operating piston.
- This channel is cut off after the movable contact operating piston has moved a predetermined distance.
- a primary object of this invention is to provide a novel operating structure for air blast circuit breakers.
- Another object of this invention is to provide a novel operating structure for air blast circuit breakers which provides an increase in the operating speed of the movable contact.
- a further object of this invention is to provide a novel pneumatic control structure for the blast valve of an air blast circuit breaker.
- a further object of this invention is to provide a novel arrangement for the operating structure of air blast circuit breakers whereby the blast valve is reclosed only after the movable contact has reached a predetermined open position.
- FIGURE 1 shows a portion of the interrupter chamber of an air blast circuit breaker in conjunction with a first embodiment of the novel operating structure.
- FIGURE 2 is similar to FIGURE 1 and shows a modification of the operating structure of FIGURE 1 in accordance with the invention.
- FIGURE 1 I have schematically illustrated, by dotted line 10, the interrupter container which will contain therein sufiicient high pressure air for at least one interruption operation.
- a portion of the lower wall of chamber is illustrated as wall 11 which is bolted to a movable contact carrying cylinder 12 which carries movable contact 13.
- the movable con "ice tact 13 cooperates with a stationary contact partially shown as contact 14- which is secured within chamber 11 and is insulated therefrom.
- the contact 14 can be the end of a conductor extending through an insulator bushing which is carried by container 10.
- the external end of this conductor (not shown) forms one terminal of the device, while housing 10, for example, forms the other terminal of the device.
- the movable contact 13 is a tubular member, as illus hated, and has a spider 15 at the lower end thereof to support the arcing contact 16 and receives the upper end of a rod 17.
- the container 10 can be placed in communication with open air through the nozle 18 in movable contact 13, internal volume 19 within cylinder 12 and through blast valve 20 when the blast valve is open (the blast valve 20 being shown in its closed position), and thence through outlet channels such as channel 21.
- the blast valve 20 is secured to a sleeve 21a which is carried by piston 22 which is movable within cylinder 23.
- the piston 22 is normally biased downwardly by the biasing spring 24.
- Rod 17 secured to a movable contact 13 extends through sleeve 21a and is axially movable with respect thereto.
- the lower end of rod '17 is secured to a piston 25 which is movable within the cylinder 26.
- the movable contact 13 is normally maintained in the engaged position shown in FIGURE 1 by means of the biasing spring 27 which extends between a shoulder formed in member 12 and the extending flange head at the top of contact 13.
- the volume 28 which contains spring 24 is seen to communicate with the interior of cylinder 26 and the open air through orifices 31 and 32.
- the volume 33 which is between the bottom of piston 22 and the top of piston 25 then communicates with a conduit 30 which is connectable to a source of high pressure operating air for operating the device.
- the conduit 30 In operation and in order to move the contact 13 to a disengaged position, the conduit 30 has a source of high pressure operating air applied thereto. This causes piston 22 to be moved upwardly to thereby open blast valve 20. At the same time, piston 25 begins to move down wardly to cause disengagement between movable contact 13 and stationary contact 14. Since the blast valve 20 is also open, the high pressure air within container 10 will flow at very rapid rate through orifice 13 to play on the are drawn between the movable contact and stationary contact 14, the blast air continuing through open blast valve 20 and out through orifices such as orifice 21.
- control air conduit 30 is placed in communication with open air by valve means not shown in the drawing. Therefore, the pressure on top of piston 25 is removed and the movable contact 13 may be reclosed by the spring 27.
- FIGURE 2 illustrates a second embodiment of the invention wherein those components similar to the components of FIGURE 1 are given similar identifying numerals.
- the structure of FIGURE 2 is provided particularly for relatively high operating current as compared to the operating current to be used in the device of FIG- URE 1.
- FIGURE 2 the piston rod 17 of FIGURE 1 has been replaced by the piston rod formed in two sections, section 38a and 38b, each of which is cylindrical, the interior of rod 38a communicating with chamber 19.
- the lower rod portion includes a chamber 39 which communicates with channel 40 in rod section 38a.
- the blast valve has a small orifice 42 therein.
- the device of FIGURE 2 is similar to that of FIGURE 1.
- the space 39 receives a stationary piston 41, as illustrated, which is secured to the bottom of the mechanism as shown.
- the operation of the device of FIGURE 2 differs from that of FIGURE 1 in that during opening motion of movable contact 13, the air within volume 39 is almost immediately depleted through channel 40 and into volume 19.
- An operating mechanism for the movable contact of an air blast circuit breaker said movable contact being movable into and out of engagement with respect to a relatively stationary contact; said movable and stationary contacts being contained within a high pressure air contamer; said high pressure air container having a blast Valve therein for connecting the interior of said container to external atmosphere and causing an air blast past said movable and stationary contacts; said operating mechanism including a piston rod having one end connected to said movable contact; said piston rod extending through said blast valve; the other end of said piston rod being connected to a first piston; said blast valve being connected to a second piston; said first and second pistons having adjacently positioned surfaces defining a first enclosed volume; the opposite surface of said second piston enclosing a second volume whereby application of high pressure gas to said first volume causes operation of said movable contact; and a pressure equalizing channel communicating between said first and second volumes.
Landscapes
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Circuit Breakers (AREA)
- Fluid-Pressure Circuits (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE988660 | 1960-10-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3094601A true US3094601A (en) | 1963-06-18 |
Family
ID=20277733
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US141431A Expired - Lifetime US3094601A (en) | 1960-10-15 | 1961-09-28 | Operating device for the movable contact of the main braking gap in an air blast circuit breaker |
Country Status (4)
Country | Link |
---|---|
US (1) | US3094601A (de) |
CH (1) | CH393475A (de) |
DE (1) | DE1180819B (de) |
GB (1) | GB929319A (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3639713A (en) * | 1968-12-10 | 1972-02-01 | Westinghouse Electric Corp | Operating mechanism for a circuit interrupter |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB764647A (en) * | 1954-02-17 | 1956-12-28 | Asea Ab | Improvements in air blast electric circuit breakers |
DE1041569B (de) * | 1955-10-05 | 1958-10-23 | Asea Ab | Druckluftschalter |
US2881291A (en) * | 1955-12-15 | 1959-04-07 | Asea Ab | Air blast circuit breaker |
GB806232A (en) * | 1956-04-14 | 1958-12-23 | Asea Ab | Improvements in electric air blast circuit breakers |
-
1961
- 1961-09-28 GB GB34819/61A patent/GB929319A/en not_active Expired
- 1961-09-28 US US141431A patent/US3094601A/en not_active Expired - Lifetime
- 1961-10-04 DE DEA38477A patent/DE1180819B/de active Pending
- 1961-10-04 CH CH1153761A patent/CH393475A/de unknown
Non-Patent Citations (1)
Title |
---|
None * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3639713A (en) * | 1968-12-10 | 1972-02-01 | Westinghouse Electric Corp | Operating mechanism for a circuit interrupter |
Also Published As
Publication number | Publication date |
---|---|
GB929319A (en) | 1963-06-19 |
CH393475A (de) | 1965-06-15 |
DE1180819B (de) | 1964-11-05 |
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