US3787652A - Electric compressed gas circuit breaker - Google Patents

Electric compressed gas circuit breaker Download PDF

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Publication number
US3787652A
US3787652A US00281495A US3787652DA US3787652A US 3787652 A US3787652 A US 3787652A US 00281495 A US00281495 A US 00281495A US 3787652D A US3787652D A US 3787652DA US 3787652 A US3787652 A US 3787652A
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US
United States
Prior art keywords
cylinder
circuit breaker
blast
keyway
openings
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
Application number
US00281495A
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English (en)
Inventor
W Konczal
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens Corp
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
Priority claimed from DE19712144215 external-priority patent/DE2144215C2/de
Application filed by Siemens Corp filed Critical Siemens Corp
Application granted granted Critical
Publication of US3787652A publication Critical patent/US3787652A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H33/91—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas

Definitions

  • An electric compressed gas circuit breaker has its elements operating in an electrically insulating housing confining compressed gas surrounding these elements. These elements include cooperating stationary and movable contacts, the movable contact being operated by a mechanism responsive to electrical overloading or other conditions to quickly move the movable contact from the stationary contact to break the electric circuit protected or controlled by the circuit breaker.
  • an arc blasting assembly may be used, which further compresses the compressed gas and ejects the gas through a nozzle directed to blast out the arc.
  • German Pat. No. 1,069,740 discloses the concept of such a circuit breaker having a blast cylinder connected to move with the movable contact so that the two are moved together during the circuit breaking action, the blast cylinder containing a stationary piston and further compressing the compressed gas by the relative movement between it and the cylinder, and the latter having a gas jet nozzle which ejects this further compressed gas into the are.
  • the blast cylinder is reciprocatively mounted and guided by a plurality of cooperating guide rods interassociated by rollers, and
  • the cylinder has external laterally projecting arms for with the movable contact mechanically connected with this cylinders bottom, and with the latter connecting with this cylinder in a movable manner to permit simplified initial assembly of the parts and subsequent easy servicing, and in such a manner that the mechanical stresses involved during circuit breaking and blast creating are distributed circumferentially uniformly and widely throughout the cylinders wall as is desirable when the latter is made from insulating material.
  • this object is attained by making the blast cylinders bottom separate from the blast cylinder and inserted in the lower end of the latter, the bottom s periphery axially slidably engaging the cylinders inner surface, the latter being formed with a radially extending keyway means and the bottom having key means extending therefrom radially into this keyway means, the key means having means for releasably fastening them to this bottom to fasten the latter and the cylinder together.
  • the keyway means may comprise one or more lateral openings from the cylinders inner surface and extending partially or completely through the cylinders wall. To effect a uniform distribution of the mechanical stresses, this keyway means may comprise a plurality of openingsas described, and which are uniformly interspaced circumferentially around the cylinder, the key means comprising a corresponding number of keys with each provided with the fastening means. By making the keyway openings circumferentially elongated, and the keys in the form of flat keys extending through these openings. the mechanical stress is widely distributed throughout the cylinder wall.
  • the end of the blast cylinder which moves towards the piston and which may be referred to as the top end, mounts both the movable electric contact and the blast nozzle; and the cylinder, through its external laterally projecting arms, receives the actuating force during circuit breaking. Therefore, the cylinder is subject to high stresses and is made of metal.
  • the blast cylinder does not require the space-occupying external laterally projecting arms because the movable contact is connected with the blast cylinder's bottom, by which is meant the blast cylinders end opposite its end having the gas blast nozzle. Therefore, the blast cylinder can be pulled or actuated, to open the circuit and create the blast, by means other than the external laterally projecting arms or the like.
  • One object of the present invention is to provide an electric compressed gas circuit breaker with an arc blasting assembly of the type described, with the blast cylinder made of electrically insulating material and fective contact area between the flat keys and the cylinder wall openings should collectively provide an effec tive contact area of at least 20 percent of the crosssectional area of the cylinders wall.
  • the cylinder wall is held rigidly with respect to the cylinders bottom so that it is reciprocatively guided and supported thereby in its proper reciprocative travel path.
  • the movable contact can be connected to the cylinders bottom.
  • the cylinder may be made of insulating material which, of course, is of less mechanical strength than metal; the need for external radially projecting arms is eliminated, thereby permitting a smaller overall circuit breaker housing, and initial assembly and subsequent servicing is simplified.
  • FIG. 1 in longitudinal section, schematicallyshows a high voltage power circuit breaker with a blasting assembly, the parts being shown on the right-hand side of the broken line in the circuit closing position and on the left-hand side of this line being shown in circuit breaking position;
  • FIG. 2 in longitudinal section, shows the blast cylinder bottom construction of the present invention
  • FIG. 3 shows a bottom end view of FIG. 2 and FIG. 4 is an elevation of a segment of FIG. 3, as indicated on the line 4-4 in FIG. 3.
  • FIG. I DESCRIPTION OF THE PREFERRED EMBODIMENT Referring first to FIG. I, it is to be understood that this isdrawn in an extremely schematic and simplified manner for the purpose of showing the general con-- struction and operation of a compressed gas circuit breaker adapted for use with high voltage electric power currents.
  • This housing may be cylindrical and made of insulating material and confines the compressed gas.
  • the gas may be SF
  • a stationary electric contact 2 is positioned in the upper end of the housing 1 and supported by the latter by means which are not shown.
  • the movable contact 3 is connected with the blast cylinder 4 made of insulating material, this contact 3 and cylinder 4 being actuated together by an actuator or drive rod 5 connected with a suitable mechanism (not shown) which, when tripped for any reason, pulls the rod 5 downwardly, this rod connecting with the blast cylinders bottom 6 to which both the contact 3 and cylinder 4 are connected.
  • a stationary annular piston 7 is positioned inside of the cylinder 4 by a plurality of supporting members 8 which pass through holes 6a in the cylinders bottom 6. The upper end of the blast cylinder 4 is closed excepting for the blast jet orifice 9.
  • the blast cylinder 4 becomes filled with the compressed gas 1 in the housing 1.
  • the circuit breaker mechanism is tripped by an electrical overload or for other reasons, the tubular drive rod 5 is pulled downwardly very rapidly, the stationary piston 7 on which the blast cylinder slides ejecting the compressed gas in the form of a blast through the blast orifice 9, and blasting out any arc that may form.
  • the actuating force exerted by the drive rod 5 is applied to the blast cylinders bottom 6 which mounts both the movable contact 3 and the cylinder 4, and that enough force must be involved to mechanically separate the contacts and to further compress the compressed gas to produce the arc extinguishing blast. This force must be transmitted to the lower end of the blast cylinder 4 through its bottom 6.
  • FIGS. 2 and 3 only the parts required to illustrate the principles of the present invention are shown. Thus, the holes 6a of FIG. 1 are not shown and the movable contact 3 is also eliminated.
  • the present invention is concerned with the connection of the cylinder 4 with its bottom 6.
  • the bottom 6 is separate from the cylinder 4, the latter being made, for example, of alaminated molded plastic.
  • the bottoms periphery 6a axially slidably engages the inner surface of the cylinder 4 adjacent to the lower end of the cylinder.
  • the cylinder's inner surface is formed with a radially extending for each key.
  • the keyway means or openings 11 comprise a plurality of circumferentially elongated openings extending through the cylinders wall and the key means or keys are in the form of flat keys extending through these openings.
  • These flat keys each have a width substantially equaling that of the keyway openings l0, and preferably the latter are provided with round ends 13 to avoid sharp corners which might introduce stress concentrations in the wall of the cylinder 4 which is made of insulating materiaL'
  • the drive rod 5, the bottom 6, the keys 11 and the fastenings 12 may all be made of metal and are, therefore, easily designed to have adequate structural strength to handle the load imposed by the rapid movement involved by the circuit breaker operation.
  • the wall of the cylinder 4 is made of electrically insulating material, and therefore non-' metallic material, and because this wall should not be made unnecessarily thick to perform its blast forming function, its ability to handle the mechanical force involved requires attention.
  • the keyway openings 10 and the flat keys 11 are designed to provide cooperative interengaging surfaces providing collectively or together an effective contact area of at least 20 percent of the cross-sectional area of the cylinders wall. This minimum should be kept in mind in the event the keyway openings are not formed completely through the wall of the cylinder 4 but are in the form of blind or bottomed recesses, this construction not being shown but being a possibility.
  • the fastening means 12 are accessible from the outside or the bottom side of the cylinders bottom 6.
  • the fastenings 12 are in the form of cap screws which are passed through holes 11a formed in the keys and screwed into threaded holes 6c formed in the bottom 6.
  • the heads 12a of the cap screws are on the outside or bottom side of the keys ll. Therefore, these fastenings are accessible from the outside or bottom side of the cylinders bottom 6.
  • FIG. 2 six of these releasable fastening means are illustrated and even moremight be used design requirements indicate, when considering the strength of the cylinder wall' made of insulating material.
  • an electric compressedgas circuit breaker may be made more compactly, particularly in its transverse or lateral direction.
  • the installation of the blast cylinder with its associated drive, such as the drive rod 5 and the necessary bottom 6 to which the movable contact is connected is easily effected. Disassembly for servicing is obviously easy.
  • the drive 5 and bottom 6, and the movable contact when carried by the bottom 6 may be inserted in the cylinder 4, the various keys 11 easily positioned, and the cap screws 12 screwed into place to complete a rigid assembly both supporting the cylinder and transmitting to it the necessarily quickly applied force during circuit breaking operation. Because the heads of the cap screws 12 are external, these fastenings may be easily unscrewed, the keys removed, and the construction disassembled for servicing when necessary.
  • An electric compressed gas circuit breaker having cooperating stationary and movable contacts and an arc blasting assembly including a stationary blast piston and cooperating therewith a blast cylinder made of electrically insulating material and having a bottom to which said movable contact is mounted; wherein the improvement comprises said bottom being separate from said cylinder and inserted therein with the bottoms periphery axially slideably engaging the cylinders inner surface, the latter being formed with a radially extending keyway means and said bottom having key means extending therefrom radially into said keyway means, and means for removably fastening said key means to said bottom to fasten the latter and said cylinder together disposed axially with respect to said cylinder and accessible from the bottom side of said bottom.
  • circuit breaker of claim 4 in which said openings and flat keys form cooperative interengaging surfaces providing all together an effective contact area of at least 20 percent of the cross-sectional area of said cylinders wall.
  • circuit breaker of claim 4 in which there are at least three of said openings and all of said openings are uniformly interspaced circumferentially around said wall, a corresponding number of said keys and their said fastening means being provided, said fastening means being accessible from the outside of said bottom.

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  • Circuit Breakers (AREA)
US00281495A 1971-08-31 1972-08-17 Electric compressed gas circuit breaker Expired - Lifetime US3787652A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712144215 DE2144215C2 (de) 1971-08-31 Elektrischer Druckgasschalter

Publications (1)

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US3787652A true US3787652A (en) 1974-01-22

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US00281495A Expired - Lifetime US3787652A (en) 1971-08-31 1972-08-17 Electric compressed gas circuit breaker

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US (1) US3787652A (enrdf_load_stackoverflow)
JP (1) JPS5616492B2 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62111082U (enrdf_load_stackoverflow) * 1985-12-28 1987-07-15

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3588407A (en) * 1967-07-31 1971-06-28 Westinghouse Electric Corp Puffer piston gas blast circuit interrupter with insulating nozzle member and valve acting hollow contacts

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3588407A (en) * 1967-07-31 1971-06-28 Westinghouse Electric Corp Puffer piston gas blast circuit interrupter with insulating nozzle member and valve acting hollow contacts

Also Published As

Publication number Publication date
DE2144215A1 (enrdf_load_stackoverflow) 1973-02-22
DE2144215B1 (de) 1973-02-22
JPS5616492B2 (enrdf_load_stackoverflow) 1981-04-16
JPS4835363A (enrdf_load_stackoverflow) 1973-05-24

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