US2965072A - Driving means for circuit breakers - Google Patents

Driving means for circuit breakers Download PDF

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Publication number
US2965072A
US2965072A US739288A US73928858A US2965072A US 2965072 A US2965072 A US 2965072A US 739288 A US739288 A US 739288A US 73928858 A US73928858 A US 73928858A US 2965072 A US2965072 A US 2965072A
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United States
Prior art keywords
piston
cylinder
venting
driving
valve
Prior art date
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Expired - Lifetime
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US739288A
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English (en)
Inventor
Kriechbaum Karl
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.)
Licentia Patent Verwaltungs GmbH
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Licentia Patent Verwaltungs GmbH
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Publication date
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Publication of US2965072A publication Critical patent/US2965072A/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
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
    • H01H33/32—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator pneumatic

Definitions

  • the present invention relates to circuit breakers, and more in particular to driving means for high-speed electric circuit breakers.
  • the driving means of the present invention comprisingcylinder and piston means efiecting the switching of: the circuit breaker, venting means, and control.
  • means for the venting means adapted to so effect the venting of the cylinder that the latter is closed during the major portion of the switching motion of the driving pistonYbut is vented at the end or shortly before the end of the switching motion of the piston.
  • the venting device can be controlled by pneumatic: means as well as mechanically.
  • a slide valve closing in its resting position a venting passage; the slide is removed and the venting passage is opened by the driving piston as soon as the same reaches a predetermined position towards the end of the switching motion.
  • the control of the venting device is efiected pneumatically by means of a venting valve comprising cylinder and piston means, means tending to open the venting valve and means foreflfecting a. balancing of pressures in the two cylinder spaces separated by the piston of the venting valve. The pressure balancing takes place towards the end of the switching motion of the driving piston and results in the opening of the venting valve.
  • Figure 1 is a sectional view of the pneumatic drive for circuit breakers of the present invention
  • Figure 2 is a sectional view of a portion of another embodiment of the present invention with a mechanically operated air vent;
  • Figure 3 is a sectional view of a portion of the embodiment shown in Figure l with a modification in the air vent;
  • Figure 4 is a sectional view of a portion of the embodiment shown in Figure 1 and showing a resilient piston construction.
  • FIG. 1 shows the driving cylinder 1 with a driving piston 2 having a tripping pin 3.
  • the cylinder has an air inlet passage 4 for receiving a pressure medium, such as compressed air used for the circuit breaking motion, and another inlet passage 5 for receiving compressed air used for the circuit making motion.
  • a centrally disposed valve 6 resting with one end in the cavity 6a of the cylinder 1, guided through the internal wall portion 6b and resting with the other end against flanges 1a and 1b of the cylinder 1. In the absence of a pressure medium or up to a predetermined pressure the valve 6 is maintained in its closed position by the pretensioned spring 7 provided in the cavity 6a.
  • the valve 6 simultaneously serves as a guide for the tripping pin 3.
  • the cylinder 1 bears an air vent it which can be closed by the valve 9 housing a piston 10- influenced by a pressure spring 14, and a slide 11 connected to the piston 10 by a connecting rod 15.
  • the valve 9 is equipped with pressure balancing means such as small borings 12 in the valve piston 10 or transfer passages 12a (Fig. 3).
  • This pneumatic drive operates in the following manner:
  • Compressed air intended to effect the breaking of the circuit is admitted into the inlet passage 4 and opens the valve 6.
  • the compressed air then enters into the cylinder space housing the piston 2 and moves the latter with the tripping pin 3 into the circuit-breaking position.
  • the pressure medium e.g. the air within the cylinder space
  • compressed. air is admitted into the inlet passage 5 and into the valve 9 as shown by the arrows 5a and 5b.
  • the piston 2 is pushed backward intothecircuit-making position and the valve 9 is closed as the air pushes the piston 12 with the slide 11 closing the inlet passage 8, so that the air introduced through the passage 5 cannot leave the cylinder space via the passage 8.
  • the resetting of the slide and piston 10, 11, can also be eifected by differential piston means rather than by the spring 14.
  • the cylinder 1 may also have two valves, one being provided for the circuit-making air and the other being provided for the circuit-breaking air.
  • An excessive recession of the driving piston can be prevented by providing a second venting valve and the driving piston 2 can be resiliently constructed in itself (Fig. 4).
  • the venting means are mechanically operated.
  • the slide valve 13 having a flange 13a projecting into the cylinder space enclosed by cylinder 1 is actuated by a pressure spring 18 and normally maintained in the position shown in Figure 2, closing the air vent passage 8.
  • a pressure spring 18 normally maintained in the position shown in Figure 2, closing the air vent passage 8.
  • the slide 13 with its flange 13a is pushed against the infiuence of spring 18 by the upper portion of piston 2, and moves along the guide recess 19 in the upper wall of cylinder 1.
  • the air vent passage 8 is opened and the air within the cylinder 1 is released.
  • the venting of the driving cylinder is effected and controlled with comparatively inexpensive means of an uncomplicated construction the switching speed is drastically accelerated.
  • the present invention makes it possible to effect this venting at the end or even shortly before the end of the switching motion proper for which the pressure medium was used. Immediately after the end of one switching operation it is therefore possible to effect another switching operation.
  • the drive means of the present invention are thus capable of effecting an unprecedented high-speed switching operation and to perform a far greater number of switching operations in a given period than any of the known devices.
  • Driving means for high-speed electric circuit breakers comprising a driving cylinder, a driving piston, a pressure medium reciprocating said piston in said cylinder, and a tripping pin mounted on said driving piston and moving therewith, thereby effecting the switching of said circuit breaker, a venting passage communicating with said driving cylinder, and a venting valve comprising a cylinder, a piston and a slide connected to said piston and moving therewith, thereby alternatingly closing and opening said venting passage, and control means causing said slide to close said venting passage at the beginning of a switching stroke of said piston and opening said venting passage towards the end of the same switching stroke.
  • Driving means for high-speed electric circuit breakers comprising a driving cylinder, a driving piston, a pressure medium reciprocating said piston in said cylinder, and a tripping pin mounted on said driving piston and moving therewith, thereby effecting the switching of said circuit breaker, a venting passage communicating with said driving cylinder, and a venting valve com prising a cylinder, a piston and a slide connected to said piston and moving therewith, thereby alternatingly closing and opening said venting passage, with said pressure medium moving said piston and slide into closed position of said venting passage at the beginning a switching stroke of said driving piston, a plurality of borings in said piston in said venting valve allowing for the establishment of a pressure balance in said cylinder of said venting valve on either side of said piston substantially at the end of the same switching stroke of said driving piston, and means urging said piston and slide of said venting valve into opened position of said 55 venting passage and adapted to move said piston and slide into opened position during the pressure balance in said cylinder of said venting valve.
  • Driving means for high-speed electric circuit breakers comprising a driving cylinder, a driving piston, a pressure medium reciprocating said piston in said cylinder, and a tripping pin mounted on said driving piston and moving therewith, thereby effecting the switching of said circuit breaker, a venting passage communicating with said driving cylinder, and a venting valve comprising a cylinder, a piston and a slide connected to said piston and moving therewith, thereby alternatingly closing and opening said venting passage, with said pressure medium moving said piston and slide into closed position of said venting passage at the beginning a switching stroke of said driving piston, a plurality of transfer passages in said cylinder in said venting valve allowing for the establishment of a pressure balance in said cylinder of said venting valve on either side of said piston substantially at the end of the same switching stroke of said driving piston, and means urging said piston and slide of said venting valve into opened position of said venting passage and adapted to move said piston and slide into opened position during the pressure balance in said cylinder of said venting valve.
  • Driving means for high-speed electric circuit breakers comprising a driving cylinder, 3. driving piston, a pres sure medium reciprocating said piston in said cylinder, and a tripping pin mounted on said driving piston and moving therewith, thereby effecting the switching of said circuit breaker, a venting passage communicating with said driving cylinder, a pressure medium-inlet passage communicating with said driving cylinder, valve means adapted to close said driving cylinder with respect to said inlet passage and resilient means moving said valve means into closed position at a predetermined pressure difference between said driving cylinder and said inlet passage, and a venting valve comprising a cylinder, a piston and a slide connected to said piston and moving therewith, thereby alternatingly closing and opening said venting passage, and control means causing said slide to close said venting passage at the beginning of a switching stroke of said piston and opening said venting passagetowards the end of the same switching stroke.
  • Driving means for high-speed electric circuit breakers comprising a driving cylinder, a driving piston, a pressure medium reciprocating said piston in said cylinder, and a tripping pin mounted on said driving piston and moving therewith, thereby effecting the switching of said circuit breaker, a venting passage communicating with said driving cylinder, a pressure medium-inlet passage communicating with said driving cylinder, combined valve and guide means guiding said tripping pin and adapted to close said driving cylinder with respect to said inlet passage and resilient means moving said valve means into closed position at a predetermined pressure difference between said driving cylinder and said inlet passage, and a venting valve comprising a cylinder, a piston and a slide connected to said piston and moving therewith, thereby alternatingly closing and opening said venting passage, and control means causing said slide to close said venting passage at the beginning of a switching stroke of said piston and opening said venting passage towards the end of the same switching stroke.

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  • Fluid-Pressure Circuits (AREA)
  • Actuator (AREA)
US739288A 1957-06-03 1958-06-02 Driving means for circuit breakers Expired - Lifetime US2965072A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL27781A DE1083897B (de) 1957-06-03 1957-06-03 Pneumatischer, vorzugsweise beidseitig beaufschlagbarer Antrieb fuer elektrische Schalter mit Entlueftungsvorrichtungen fuer schnell aufeinanderfolgende Schaltungen

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Publication Number Publication Date
US2965072A true US2965072A (en) 1960-12-20

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ID=7264288

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US739288A Expired - Lifetime US2965072A (en) 1957-06-03 1958-06-02 Driving means for circuit breakers

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US (1) US2965072A (de)
DE (1) DE1083897B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3208476A (en) * 1961-11-01 1965-09-28 Clack Corp Automatic control valves for fluid conditioning systems

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3655931A (en) * 1970-02-19 1972-04-11 Westinghouse Electric Corp Synchronously operating circuit breaker with improved circuit breaker operating mechanism
DE3321230A1 (de) * 1983-06-11 1984-12-13 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Antriebssystem fuer einen hochspannungs-leistungsschalter
JPH0434813A (ja) * 1990-05-30 1992-02-05 Hitachi Ltd 高速度遮断器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2467434A (en) * 1947-05-10 1949-04-19 Air Associates Inc Servomotor and pressure responsive valve therefor
US2740859A (en) * 1953-12-28 1956-04-03 Gen Electric Fluid actuated circuit breaker operating mechanism
US2769912A (en) * 1954-04-12 1956-11-06 Phillips Petroleum Co Shut-off valve

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE751183C (de) * 1937-12-23 1952-11-04 Aeg Druckluftantrieb fuer elektrische Schalter mit rasch aufeinanderfolgenden Ein- und Ausschaltbewegungen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2467434A (en) * 1947-05-10 1949-04-19 Air Associates Inc Servomotor and pressure responsive valve therefor
US2740859A (en) * 1953-12-28 1956-04-03 Gen Electric Fluid actuated circuit breaker operating mechanism
US2769912A (en) * 1954-04-12 1956-11-06 Phillips Petroleum Co Shut-off valve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3208476A (en) * 1961-11-01 1965-09-28 Clack Corp Automatic control valves for fluid conditioning systems

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Publication number Publication date
DE1083897B (de) 1960-06-23

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