US3728504A - High voltage circuit breaker - Google Patents

High voltage circuit breaker Download PDF

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Publication number
US3728504A
US3728504A US00223637A US3728504DA US3728504A US 3728504 A US3728504 A US 3728504A US 00223637 A US00223637 A US 00223637A US 3728504D A US3728504D A US 3728504DA US 3728504 A US3728504 A US 3728504A
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US
United States
Prior art keywords
circuit breaker
breaker according
housing
disposed
stationary
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
US00223637A
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English (en)
Inventor
H Beier
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Siemens AG
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Siemens AG
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Publication date
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Publication of US3728504A publication Critical patent/US3728504A/en
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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
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/14—Multiple main contacts for the purpose of dividing the current through, or potential drop along, the arc
    • 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

Definitions

  • ABSTRACT The invention proposes a high voltage circuit breaker, [30] Forelg Apphcauo Pnonty Data which contains a switching arrangement in a metal Feb. 17, 1971 Germany ..P 21 08 265.5 housing, which in the P included Structural Support for the switching arrangement in the housing.
  • a rotary meat slicing knife comprising a blade having opposite sides and a convexly curved, uninterrupted, sharpened cutting edge extending continuously between opposite extremities. Means are provided for mounting the blade for eccentric rotation in a given direction about an axis normal to the blade sides with the leading one of the cutting edge extremities being more closely spaced from the axis of rotation than the trailing one of the extremities.
  • One side of the blade has a plurality of circumferentially contiguous segments formed thereon adjacent said cutting edge and extending between the cutting edge extremities.
  • Each of the segments comprises a surface which smoothly tapers away from the cutting edge and which also smoothly tapers in thedirection of rotation toward the other side of the blade to the adjacent segment thus forming a compound wedge configuration pointing toward the cutting edge and in the direction of rotation for separating a slice of meat from a larger piece upon one revolution of the blade.
  • FIG. 1 is a fragmentary view in perspective, partly broken away, illustrating a meat slicing machine incorporating the improved rotary meat slicing knife of the invention
  • FIG. 2 is a side view of the rotary meat slicing knife of the invention
  • FIG. 3 is a top view of the knife of FIG. 2;
  • FIG. 4 is a cross-sectional view taken generally along the line 4-4 of FIG. 2;
  • FIG. 5 is a cross-sectional view taken generally along the line 5-5 of FIG. 2;
  • FIG. 6 is an end view as viewed generally along the line 6-6 of FIG. 2;
  • FIG. 7 is a fragmentary cross-sectional view taken generally along the line 7-7 of FIG. 2;
  • FIG. 8. is a fragmentary view in perspective further illustrating the wedge segments of the knife of the previous figures.
  • FIG. 9 is another side view of the knife of the inven- 0 tion illustrating its slicing action.
  • FIG. 1 there is shown a portion of a meat slicing machine, generally indicated at 10, having a meat loading and feeding bin 12, a slice-receiving bin 14, and the improved rotary meat slicing knife 16 of the invention mounted for rotation between bins l2 and 14 within'guard l8.
  • Knife 16 is driven by a suitable motor (not shown) through gear box 20.
  • Suitable meat feeding mechanism 22, which does not form a part of the present invention, is actuated by lead screw 24 driven by gear box 20, and incrementally feeds the piece of meat in bin 12 forwardly under knife 16 in response to each revolution thereof thereby to slice off one slice of the desired thickness.
  • knife 16 comprises generally crescent-shaped blade 26 having opposite ends 28, 30 and convexly curved, uninterrupted, sharpened cutting edge 32 having its opposite extremities 34, 36 terminating at blade ends 28, 30.
  • cutting edge 32 is accurately curved having the center of its radius of curvature located as shown at 38 in FIG. 2.
  • Back-up plate 38 engages side 40 of blade 26, mounting hub 42 engages back-up plate 38, and mounting hub 44 engages side 46 of blade 26, blade 26, back-up plate 38 and mounting hubs 42, 44 being held in assembled relation by suitable screws 48.
  • Back-up plate 38 has beveled edges 39 facing cutting edge 32.
  • Sleeve 50 extends through openings in blade 26, backup plate 38 and mounting hubs 42, 44 and is secured thereto by suitable screws, one of which is shown at 52.
  • Knife 16 is adapted to be mounted on the output shaft (not shown) of gear box 20 by means of sleeve 50 which has a keyway 54 therein for keying knife 16 to the output shaft.
  • Cap 56 covers one end of sleeve 50 and is secured to mounting hub 42, as be welding.
  • knife 16 is adapted to be mounted for eccentric rotation about axis 58 adjacent end 28 of blade 26. Knife 16 is rotated by the motor and gear box 20 in the direction shown by arrow 60, extremity 34 of cutting edge 32 thus being the leading extremity and being more closely spaced from axis of rotation 58 than the trailing extremity 36.
  • side 40 of blade 26 has a plurality of circumferentially' contiguous segments 60, 62 formed thereon adjacent cutting edge 32 and extending between extremities 34, 36.
  • Each segment 62 is formed by surface 64 which, as viewed in transverse cross-section as seen in FIGS. 4, 5 and 6, tapers smoothly away from cutting edge 32 and, as viewed in longitudinal cross-section as shown in FIG. 7, also tapers smoothly in the direction of rotation 60 toward side 46 of the blade to the'adjacent segment 62.
  • each segment 62 is joined to the adjacent segment by a discrete trailing edge 66 which extends inwardly from cutting edge 32 and is preferably slightly inclined in direction of rotation 60, as best seen in FIG. 2.
  • Tapered surface 64 of each segment 62 thus forms a compound wedge configuration which points toward cutting edge 32 and in the direction of rotation 60.
  • Blade 26 may be formed of any suitable metal and in a specific embodiment is formed of D-2 air hardened tool steel.
  • FIG. 9 of the drawings the relationship of knife 16 to loading and feeding bin 12 is shown as viewed generally in the direction shown by the arrow 9 in FIG. 1, guard 18 being eliminated.
  • feeding mechanism 22 pushes piece 68 of meat forwardly the requisite distance so that upon the next revolution of knife 16, a slice of the desired thickness will be cut-off.
  • a 1,750 r.p.m. motor is employed with gear box 20 providing a to 1 speed reduction thus driving knife 16 at 175 r.p.m. so as to provide 175 slices per minute.
  • the position of cutting edge 32 immediately prior to beginning a slicing operation is shown in dashed lines at 32-1, and intermediate positions during the slicing operation are shown in dashed lines at 32-2 and in solid lines in FIG. 9.
  • point 72 on cutting edge 32 the path of movement of point 72 about axis 58 is shown by arrow 74.
  • the path of movement 74 of point 72 can be vectorially resolved into component 76 normal to cutting edge 32 and component 78 tangent to cutting edge 32, it being observed that the compound wedge configuration formed by the tapered surface 64 of the respective segment 62 is likewise tapered or pointed in directions 76, 78.
  • the improved slicing knife 16 of the invention provides smoother, easier and faster cutting with less power than prior art machines.
  • flying wedge cutting edge configuration of the invention is particularly applicable to rotary meat slicing knives, as described above, it is also applicable to other types of slicing knives.
  • this descripsaid blade for eccentric rotation in a iven direction about an axis normal to said sides with e leading one of said cutting edge extremities being more closely spaced from said axis than the trailing one of said extremities, one side of said blade having a plurality of circumferentially contiguous segments formed thereon adjacent said cutting edge and extending between said extremities, each of said segments comprising a surface which smoothly tapers away from said cutting edge and which also smoothly tapers in said direction toward the other side of said blade to the adjacent segment thereby forming a compound wedge configuration pointing toward said cutting and in said direction for separating a slice of meat from a larger piece upon one rotation of said blade.
  • each of said segments is joined to the adjacent segment by a discrete trailing edge.
  • a slicing blade having opposite sides and an uninterrupted, sharpened cutting edge extending continuously between opposite extremities, one side of said blade having a plurality of contiguous segments formed thereon adjacent said cutting edge and extending between said extremities, each of said segments comprising a surface which smoothly tapers away from said cutting edge and which also smoothly tapers toward one of said extremities and the other side of said blade to the adjacent segment thereby forming a compound wedge configuration pointing toward said cutting edge and said one extremity.
  • the invention relates to a high voltage circuit breaker with a switching arrangement disposed in a metal housing and insulated therefrom.
  • the arrangeand is similarly disposed in the metal housing.
  • the so-called switching chamber tube has been provided in the form of an insulating material tube, which encloses'both of the switching pieces, as well as the sliding contact and provides for the mechanical support of the switching l5 arrangement.
  • insulating material rods are used, as known from the US. Pat. No.
  • a heavy-duty switch breaker will be described here comprising a metal encapsulated high voltage circuit breaker arrangement with sulfahexafluoride as a quenching and insulating gas using a potential of 220 or more kV.
  • the circuit breaker includes a grounded metal housing 1, which consists of a cylindrical portion 2 having three tubular pipe sockets 3, 4 and 5.
  • the circuit breaker includes a grounded metal housing 1, which consists of a cylindrical portion 2 having three tubular pipe sockets 3, 4 and 5.
  • insulating material rods are used which are at least provided on opposite sides of. the circuit'breaker arrangement, whereby a mechanically stabilized ladder-formed structure is obtained.
  • the invention consists in that the impedance at high voltage potential provides the only rigid mechanical connection between the stationary switching piece and the sliding contact.
  • the impedance whose function it is to facilitate the disconnect or connect of the high potential circuit breaker or to act as a control impedance for the control of the voltage 3 distribution, particularly in circuit breakers with multiple interruption, simultaneously functions also as a mechanical construction element.
  • the usual switching chamber tube or corresponding insulating rods may be dispensed with.
  • the switching arrangements are carried by a single support.
  • This support engages in the middle of the structure at the ends of the switches facing each other.
  • the other ends, which face away from each other, to which electrical connections have been made without imposing mechanical stresses thereon, are connected mechanically to the support only through the impedances in parallel with the switches.
  • the control impedances are free of all mechanical stresses, which from ends of the cylindrical portion 2 are closed by means of covers 6 and 7.
  • Two equal, electrically in series connected switch includes two stationary electrodes 13 and 15, .which are hollow and function as jet nozzles. During the connect position, the electrodes are connected through a hollow movable switching pin 14. The circuit then comprises the electrode 13, which is to be considered as a stationary portion, over the switching pin 14 to the electrode 15, which, acting as a sliding contact, conducts the current from the switching pin 14 to a stationary metal housing 16, disposed in the center between the two switching arrangements 11 and 12.
  • a hollow supporting insulator 20 consisting of cast resin engages the metal housing 16. The insulator 20 is rigidly. connected with the metal housing 16 at its high potential end.
  • the grounded end of the O insulator, extending into the socket 4, is rigidly semotion of an insulating material driving rod 24 in the' direction of the axis of the insulator 20 which is guided through the metal housing 16 as at 25.
  • Two angle levers 26 and 27,:movable in counteraction, are thereby set into motion and are coupled with the movable switching pins 14 of the switching arrangements 11 and 12 through rods 28.
  • Therods 28 are further connected with a blast cylinder 30 which, during disconnect, is pulled over a stationary blast piston 31, whereby by means of sulfahexafluoride, which is subject to compression thereby and which streams through the hollow switch pieces 13 and 14, a quenching of the electric arc is effected.
  • Arounded metal cap'33 is secured to the end of the respective switching arrangements 11 and 12, which are remote from the support 20, whereon the stationary switch piece 13 is supported.
  • This metal cap is connected with the metal housing 16 over the control condensers 35, which are connected in parallel to the switching arrangements 11 and 12, and which serve to provide an even distribution of the potential on both of the switching arrangrnents.
  • the control condensers with the aid of cast resin, are made such that tliey are not only self-supporting, but are also capable of taking up mechanical stresses. Individually, they are considered as partial impedances, which are arranged in spatial symmetry with respect to the switching arrangments 1 1 and 12.
  • the plug contact connection 36 is not capable of transmitting mechanical stresses, since it is comprised of two sphere-like thickened conductor ends 41 and 42 which are electrically connected through contact laminations 43.
  • the contact laminations are subject to the action of leaf springs 44 which are supported at a cylindrical housing 45.
  • a freely movable and electrically well conducting connection is available so that mechanical stresses are not capable of being transmitted from the switching units to their inlets.
  • the impedances 35 is provided by the impedances 35. It is thus possible to get along in this circuit breaker, in accordance with the invention, with a few simple insulating material parts, which are protected against weathering by means of the metal housing 1.
  • a high voltage circuit breaker comprising a metal housing, at least one switch arrangement disposed in said housing and electrically insulated therefrom; said switch arrangement including a stationary switch portion and a movable switch pin disposed for coaction therewith, and a stationary sliding contact for guiding said pin; an impedance disposed in said housing for controlling the high voltage switching forming the only rigid'mechanical connection between said stationary switch portion and said sliding contact.
  • circuit breaker according to claim 1 wherein said impedance comprises a condenser made of cast resin.
  • circuit breaker according to claim 1, wherein there are included two series connected switching arrangements each having two ends, one end being adjacent to and facing and the other end being remote and facing away from that of the other switch arrangement, means for supporting said switching arrangements disposed adjacent said facing ends, electrical connecting means connected to each of said remote ends, and means in said housing forming an inlet each for each of said electrical connecting means.
  • circuit breaker according to claim 5 further including means for mechanically linking said remote ends to said supporting means comprising solely said impedances disposed in parallel to said switching arrangements.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Slide Switches (AREA)
  • Circuit Breakers (AREA)
  • Gas-Insulated Switchgears (AREA)
US00223637A 1971-02-17 1972-02-04 High voltage circuit breaker Expired - Lifetime US3728504A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2108265A DE2108265C3 (de) 1971-02-17 1971-02-17 Hochspannungsschalter
US23884372A 1972-03-28 1972-03-28

Publications (1)

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US3728504A true US3728504A (en) 1973-04-17

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US00223637A Expired - Lifetime US3728504A (en) 1971-02-17 1972-02-04 High voltage circuit breaker
US00238843A Expired - Lifetime US3786216A (en) 1971-02-17 1972-03-28 High-voltage circuit breaker equipped with means for precluding the transfer of mechanical switching forces

Family Applications After (1)

Application Number Title Priority Date Filing Date
US00238843A Expired - Lifetime US3786216A (en) 1971-02-17 1972-03-28 High-voltage circuit breaker equipped with means for precluding the transfer of mechanical switching forces

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US (2) US3728504A (de)
CH (1) CH533899A (de)
DE (1) DE2108265C3 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3919511A (en) * 1972-05-31 1975-11-11 Siemens Ag High-voltage apparatus such as a circuit breaker or the like equipped with means for preventing impairment of the electric field within the apparatus enclosure
US4103128A (en) * 1974-06-13 1978-07-25 Mitsubishi Denki Kabushiki Kaisha Tank-type compressed-gas circuit-breaker having capacitance-supporting means
DE3034885A1 (de) * 1980-09-12 1982-04-29 Siemens AG, 1000 Berlin und 8000 München Druckgas-leistungsschalter
DE3034886A1 (de) * 1980-09-12 1982-04-29 Siemens AG, 1000 Berlin und 8000 München Druckgas-leistungsschalter
US4516006A (en) * 1982-03-09 1985-05-07 Tokyo Shibaura Denki Kabushiki Kaisha Puffer type gas-blast circuit breaker

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5624972B2 (de) * 1973-11-05 1981-06-09
FR2272475B1 (de) * 1974-05-20 1977-10-21 Alsthom Cgee
DE2526942A1 (de) * 1975-06-16 1976-12-30 Licentia Gmbh Hochspannungs-leistungsschalter
DE2913379C3 (de) * 1979-03-30 1988-03-24 Siemens AG, 1000 Berlin und 8000 München Mehrpoliges elektrisches Schaltgerät mit einem in den Innenraum eines rohrförmigen Grundgestells hineinragenden Montagekörper
JPS61292829A (ja) * 1985-06-21 1986-12-23 三菱電機株式会社 三相一括形ガス遮断器
DE3709290A1 (de) * 1987-03-20 1988-09-29 Licentia Gmbh Druckgasisolierter hochspannungsleistungsschalter mit einschaltwiderstand
DE4320906C2 (de) * 1993-06-18 2000-07-27 Siemens Ag Gehäuse für einen druckgasisolierten Hochspannungs- Leistungs-Schalter
FR2744561B1 (fr) * 1996-02-02 1998-02-27 Gec Alsthom T & D Sa Disjoncteur a enceinte metallique a la terre
EP1748455A1 (de) 2005-07-29 2007-01-31 VA TECH Transmission & Distribution SA Elektrische Schaltanlage
WO2019097681A1 (ja) * 2017-11-17 2019-05-23 三菱電機株式会社 開閉装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3052783A (en) * 1957-07-19 1962-09-04 Siemens Ag Compressed-gas circuit interrupters
US3075060A (en) * 1957-10-30 1963-01-22 Westinghouse Electric Corp Circuit interrupters
US3160727A (en) * 1961-10-24 1964-12-08 Gas-blast orifice-type interrupting unit
US3446928A (en) * 1965-10-20 1969-05-27 Allis Chalmers Mfg Co Interrupting device having u-shaped parallel current paths

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1268013A (fr) * 1959-07-27 1961-07-28 Brown Disjoncteur à gaz comprimé
FR1337322A (fr) * 1962-07-11 1963-09-13 Alsthom Cgee Nouvelles dispositions de disjoncteurs pneumatiques pour les très hautes tensions

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3052783A (en) * 1957-07-19 1962-09-04 Siemens Ag Compressed-gas circuit interrupters
US3075060A (en) * 1957-10-30 1963-01-22 Westinghouse Electric Corp Circuit interrupters
US3160727A (en) * 1961-10-24 1964-12-08 Gas-blast orifice-type interrupting unit
US3446928A (en) * 1965-10-20 1969-05-27 Allis Chalmers Mfg Co Interrupting device having u-shaped parallel current paths

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3919511A (en) * 1972-05-31 1975-11-11 Siemens Ag High-voltage apparatus such as a circuit breaker or the like equipped with means for preventing impairment of the electric field within the apparatus enclosure
US4103128A (en) * 1974-06-13 1978-07-25 Mitsubishi Denki Kabushiki Kaisha Tank-type compressed-gas circuit-breaker having capacitance-supporting means
DE3034885A1 (de) * 1980-09-12 1982-04-29 Siemens AG, 1000 Berlin und 8000 München Druckgas-leistungsschalter
DE3034886A1 (de) * 1980-09-12 1982-04-29 Siemens AG, 1000 Berlin und 8000 München Druckgas-leistungsschalter
US4516006A (en) * 1982-03-09 1985-05-07 Tokyo Shibaura Denki Kabushiki Kaisha Puffer type gas-blast circuit breaker

Also Published As

Publication number Publication date
CH533899A (de) 1973-02-28
DE2108265C3 (de) 1978-05-11
US3786216A (en) 1974-01-15
DE2108265A1 (de) 1972-08-24
DE2108265B2 (de) 1976-05-20

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