US3336454A - Means for controlling the blast valve of a gas blast circuit breaker - Google Patents

Means for controlling the blast valve of a gas blast circuit breaker Download PDF

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Publication number
US3336454A
US3336454A US421777A US42177764A US3336454A US 3336454 A US3336454 A US 3336454A US 421777 A US421777 A US 421777A US 42177764 A US42177764 A US 42177764A US 3336454 A US3336454 A US 3336454A
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United States
Prior art keywords
blast
valve member
pilot valve
movable
blast valve
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Expired - Lifetime
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US421777A
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English (en)
Inventor
John W Beatty
Richard H Miller
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General Electric Co
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General Electric Co
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Filing date
Publication date
Priority to DENDAT1515781 priority Critical patent/DE1515781A1/de
Application filed by General Electric Co filed Critical General Electric Co
Priority to US421776A priority patent/US3336453A/en
Priority to US421777A priority patent/US3336454A/en
Priority to GB49858/65A priority patent/GB1098380A/en
Priority to DE19651515789 priority patent/DE1515789A1/de
Priority to CH1792965A priority patent/CH457583A/de
Priority to FR43968A priority patent/FR1462615A/fr
Application granted granted Critical
Publication of US3336454A publication Critical patent/US3336454A/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
    • H01H33/02—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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/86—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid under pressure from the contact space being controlled by a valve

Definitions

  • This invention relates to a gas blast circuit breaker and, more particularly, to improved means for controlling the blast valve of such ⁇ a circuit breaker.
  • the circuit ybreaker of the present invention there is a pair of relatively movable contacts that can be separated to draw an arc therebetween and a yblast valve that is operable .at the time of contact-separation to cause a blast of pressurized gas to flow through the arcing region to aid in extinguishing the arc.
  • the blast valve comprises a movable valve member that can be operated from a normally-closed position toward .a fully-open position to create the gas blast. After a period of time suicient to insure extinction .of the arc, the movable blast valve member is returned to its normally-closed position to terminate the blast, thereby preventing wastage of pressurized gas that would result from continuation of the gas blast.
  • an object of our invention is to provide means for insuring that the movable blast valve member remains open long enough to provide a gas blast of :adequate duration for insuring .arc-extinction.
  • Another object is to control the movable blast valve member with a pilot valve a'nd to provide an interlock between the pilot valve and the movable blast valve member that :acts to insure correct operation of the movable blast valve member once the pilot valve initiates opening movement of the movable blast valve member.
  • a gas blast circuit breaker comprising a pair of contacts separable to establish an arc therebetween and blast-control means for creating a gas blast through the region of the arc to aid in extinguishing the arc.
  • the blast-control means comprises a source of high pressure fluid and a movable blast valve member having a normally-closed position, out of which it can be moved toward a fullyopen position to create the gas blast.
  • Actuating means is provided for the blast valve member, and this actuating means has a blast valve-opening surface on which pressurized fluid is adapted to act in a blast valve-opening direction.
  • This actuating means is controlled by means including a pilot valve that comprises a movable pilot valve member having a normally-closed position for blocking communication between the high pressure source and the blast valve-opening surface and an open position for affording communication between the high pressure source and the blast v-alve opening surface.
  • Means responsive to entry of the movable blast valve member into substantially its fully-open position .after the pilot valve has been opened is provided for effecting reclosing of the pilot valve when the movable blast valve member enters substantially said fully open position.
  • Means is also provided for holding the pilot valve member open until the blast valve member enters substantially said fully-open position, thus preventing said pilot valve from closing until the movable blast valve member enters substantially its fully-open position.
  • the blast valve actuating means has a blast valve-closing surface, and means responsive to return of the pilot valve member to its normally-closed position is provided for causing high pressure fluid to act on the blast valve-closing surface to return the movable blast valve member to its normallyclosed position upon return of the pilot valve to its normally-closed position.
  • FIG. 1 is a schematic side elevational view partly in section of a circuit breaker embodying one form of our invention.
  • FIG. 2 is a cross sectional view taken along the line 2-2 of FIG. 1.
  • FIG. 3 is a schematic cross sectional View taken along the line 3--3 of FIG. 2.
  • FIG. 3 shows the circuit breaker in its normally-closed position.
  • FIG. 3a is .a schematic showing a portion of the circuit breaker when in its position of FIG. 3.
  • FIG. 4 is a schematic cross sectional View similar to FIG. 3 except showing the circuit breaker in a position in which its blast valve and contacts are fully-open.
  • the circuit breaker shown therein comprises a metallic tank 10 lled with a highly pressurized gas, preferably air.
  • This tank 10 is mounted on a tubular insulating column 12, preferably of porcelain, that isolates the tank from ground.
  • each of these bushings comprises a centrally-disposed rigid conductor 1S and a tubular insulating assembly 20 surrounding and supporting the conductor 13 and insulating it from the tank 1t) when the circuit breaker is open.
  • each vof these conductors 18 is a stationary contact 22.
  • a pair of movable contacts 24 each of which is pivotally mounted rat 26 on a central metallic support 28 that is mounted on the tank 10 and electrically connected thereto.
  • an electrical circuit extends through the circuit breaker via one conductor 18, one pair of contacts 22, 24 through the central metallic support 28, the other pair of contacts 22, 24, and the other conductor 18.
  • the contacts 24 are simultaneously operated from their closed position of FIG. 1, into their open position by .driving a centrally disposed crosshead 30 in a downward direction.
  • This crosshead 30 is coupled to the contacts 24 by means of links 32, each of which is pivotally connected at its opposite ends to a contact 24 and the crosshead 3G.
  • links 32 each of which is pivotally connected at its opposite ends to a contact 24 and the crosshead 3G.
  • the above-described contact-separation produces an arc between the contacts of each pair, and this arc is extinguished after a short interval by a blast of pressurized gas which flows through the arcing region.
  • This gas blast is produced by opening a normally-closed blast valve 35 just prior to the time the contacts separate to form the arc.
  • the normally-closed blast valve 35 comprises a movable valve member 36 that is located in a blast passage 37. This blast passage 37 extends upwardly to atmosphere from two nozzles 38 respectively located adjacent the two arcing regions.
  • pressurized gas flows from the tank 10 through the nozzles 38 and blast passage 37 via paths such as illustrated by arrows 40.
  • the movable blast valve member 36 After the movable blast valve member 36 has remained in open position for a suflicient period to effect arc-extinction, it is returned to its closed position of FIG. 1 to terminate the gas blast.
  • This valve-closing prevents the pressurized gas in the tank from being wasted by continued flow from the tank after a circuit-interrupting operation.
  • the contacts are normally caused to remain open after an interrupting operation to maintain two series-related intercontact gaps in the circuit through the circuit breaker.
  • a pneumatically-controlled operating mechanism 50 located in the hollow support 28 is provided.
  • This operating mechanism 50 is best shown in FIG. 3. It comprises a stationary centrally-located cylinder 52 that is normally lilled with pressurized gas from the tank 10. rl ⁇ his pressurized gas is supplied from the tank through a pair of identical parallel feed passages 56, each having ports 57, 58, 59 and 59a opening into the interior of the stationary cylinder 52.
  • the stationary cylinder 52 has a lower end wall 53 and an upper end wall 54.
  • the dashpot piston 60 Slidably mounted within the stationary cylinder 52 is a contact-opening dashpot piston 60 that is -rigidly connected to the crosshead 3i).
  • the dashpot piston 60 has a vertically-extending piston rod 61 that extends through the lower end wall 53 and is suitably joined to a portion 150 of the crosshead 30.
  • a threaded portion of the piston rod 61 extends through the portion 150 of crosshead 30, and a nut 62 is threaded thereon to clamp the crosshead portion 150 between the nut 62 and a shoulder on the piston rod 61.
  • Also secured to the crosshead 30 is a plurality of rods 64 that project upwardly from the crosshead :about the outside of cylinder 52. As will soon appear more clearly, contact-opening forces are transmitted through these rods 64 to effect downward opening motion of crosshead 30.
  • the rods 64 bear at their upper end against a blast valve actuating piston 65 that is integral with the movable blast valve member 36.
  • This piston 65 is of an annular form and surrounds the cylinder 52 with a sliding t.
  • a suitable O-ring seal 63 is preferably provided to prevent pressurized air from leaking past the piston 65 along the outer surface of cylinder 52.
  • the movable blast valve member 36 is of a cylindrical form and closely surrounds the upper end wall 54, which has a circular outer periphery slidably tting within the cylindrical blast valve member 36.
  • the outer periphery of the movable blast valve member 65 is slidably mounted within a cylindrical portion 67 of the stationary support 28. This portion 67 cooperates with a suitable piston ring on piston 65 to prevent pressurized air from leaking along this outer periphery into the space 109 beneath the piston 65.
  • the movable blast valve member 36 can be driven in a downward opening direction by supplying pressurized air to an act-uating chamber 66 located immediately above the blast valve actuating piston 65.
  • the upper end wall 54 of cylinder 52 extends radially outward past the outer periphery of the cylinder 52 and defines an upper wall for this actuating chamber 66.
  • An inlet 69 communicates with this actuating chamber 66. When high pressure air is permitted to ow through this inlet passage 69, as will soon be described, it will flow into the actuating chamber 66 and build up a pressure that acts on the upper surface 65a of the blast valve actuating piston 65 to drive the piston 65 in a downward blast-valve opening direction.
  • This upper surface 65a of the piston 65 is referred to hereinafter as the blast valve opening surface.
  • FIG. 4 illustrates the blast valve member 36 in its fully open position with the high pressure air 4 streaming past its upper surface. Downward movement of the blast valve piston into its position of FIG. 4 is also transmitted through the rods 64 and the crosshead 30 to the movable contacts 24. This causes these contacts to open and draw a pair of arcs adjacent the nozzles 38. These arcs are extinguished after a short period by the gas blast through the nozzles.
  • a normally-closed pilot valve 70 comprising a moveable pilot valve member 71 is provided.
  • a flow passage 72 located centrally of the end wall 54 and a connecting passage 73 that connects the central passage 72 with inlet passage 69.
  • an annular sealing surface thereon abuts against a suitable seat on the end wall 54 and thus prevents high pressure air from entering the passages 72, 73 :and 69.
  • the pilot valve member 71 For assisting in opening the pilot valve member 71 and for holding the pilot valve mem-ber 71 in its open position for the desired period, the pilot valve member 71 is provided with a booster piston 75.
  • This booster piston 75 is secured to the upper end of an upwardlly-extending extension of pilot valve member 71.
  • the booster piston 75 is slidably mounted within a booster cylinder 76, and a compression spring 77 is located between the booster piston 75 and the end wall 54 to exert an upward biasing force on the movable pilot valve member 71 that normally holds the movable pilot valve member in Vlits closed position of FIG. 3.
  • An actuating chamber 78 for the booster piston 75 is located between the upper surface 79 of the booster piston and the upper end wall of the booster cylinder 76.
  • the actuating chamber 78 for the booster piston is normally vented to atmosphere through ⁇ a passage 80 that extends through the extension of the movable pilot valve -member 71 into the central ow passage 72.
  • the central how passage 72 is, in turn, normally vented to atmosphere through a passage 82 and a slot 84 formed -in the inner cylindrical surface of blast valve member 36 and aligned with passage 82 when the blast valve -is closed.
  • Reset of the movable pilot valve member 71 to its closed position of FIG. 3 is accomplished at a subsequent point by supplying high pressure air to the space S7 beneath the booster piston 75.
  • a pilot valve reset passage 90 is provided leading into the reset space 87.
  • This pilot valve reset passage 90 has an inlet that is located in vertical alignment with the passage 73, but no effective communication normally is present between passages 73 and 90.
  • the movable blast valve member 36 moves into its fully-open position of FIG. 4,
  • an interlock slot 92 formed in its inner surface establishes effective communication between passages 73 and 90. This permits high pressure air to flow through passages 73 and 90 via interlock slot 92 and into the reset space 87, thereby ybuilding up a pressure in the reset space 87. This pressure acts in an upward direction on the lower surface 75b of booster piston 75. (Note that lower surface 7511 includes upper and lower area portions as designated in FIG. 3.) Since force on the lower surface 75b of the booster piston 75 acts in a direction to close the pilot valve 71, then surface 75b will be referred to hereinafter as the pilot valve-closing surface.
  • piston 75 Since piston 75 has a substantially larger lower surface 75l) than upper surface 79, there is a net force on the piston 75 acting in a direction to return the movable pilot valve member 71 from its position of FIG. 4 to its normally-closed position of FIG. 3.
  • the compression spring 77 also helps to provide force for this resetting operation.
  • the space immediately surrounding the cup-shaped booster piston 75 is vented to atmosphere through a passage 93 to prevent air from leaking between opposite sides of the booster piston along the outer :surface of the piston.
  • a pair of pistons 100 and 102 are provided, slidably mounted in the cylinder 52.
  • the upper piston 100 which will be referred to as the pilot piston, is directly connected to the movable pilot valve member 71.
  • the other piston 102 ⁇ which will be referred to as the control piston, is connected to an operating rod 104 which eX- tends through an opening in the lower wall 53 of the cylinder 52 and then, as shown in FIG. 1, through a sealed opening in the wall of tank and then through the interior of the insulating support column 12.
  • Suitable operating means (not shown) is provided at the lower end of the rod 104 for operating the rod 104 in a downward direction.
  • the rod 104 preferably passes through the lower end wall 53 of cylinder 52 via a central bore 107 in the dashpot piston rod 61.
  • the upper piston 100 continues moving in pneumatically coupled follow-up relationship to the lower piston 102 until the lower piston crosses the port 58. When this occurs, high pressure air ows through the port 58 into the space 105 between the two pistons, equalizing the pressure on opposite sides of the upper piston 100 to, in effect, break the pneumatic coupling between the two pistons 100 and 102.
  • the upper piston does not immediately return to its normal position of FIG. 3. This is the case because the booster chamber 78 has then filled with high pressure air acting in a downward direction on thebooster piston 75 and the movable pilot valve member 71. The downward force exerted by this high pressure air holds the pilot valve member 71 in its fully open position until the movable blast valve member 36 has reached substantially its fully open position.
  • the movable blast valve member 36 remains in its fully-open position of FIG. 4 until the movable pilot valve member 71 has returned to substantially its normally-closed position of FIG. 3.
  • the force for blast-valve closing is developed in a blast-valve closing chamber 109 at the lower side of the blast-valve piston 65.
  • this chamber 109 is normally vented to atmosphere.
  • chamber 109 is no longer vented to atmosphere and a pressureequalizing passageway is present connecting blast-valve actuating chamber 66 and the blast-valve closing chamber 109 at the lower side of the blast valve piston 65.
  • This pressure-equalizing passageway is constituted by passages 69, 73, 72, 86, 82 and 110 and is open when the movable pilot valve member 71, 85 uncovers port 86 near the end of its above-described closing motion. Passage normally vents the blast valve closing space 109 to atmosphere through passages 82 and 84, as seen in FIG. 3. But when the blast valve member 36 is in its fully open position of FIG. 4, passage 02 is shut off from atmosphere by reason of slot 84 in the movable blast valve member moving out of alignment therewith.
  • a vent passage in the form of an external groove is provided in the movable pilot valve member 71.
  • This vent passage 115 vents the passages 110 and 82 to atmosphere through a vent 116 in the end cap 54 aligned with the vent passage 115 while the movable pilot valve member 71 is in its open position of FIG. 4.
  • This venting means 115, 116 insures that any leakage of high pressure air into blast valve closing chamber 109 (when the blast valve is open and vent 04 in the blast valve member 36 is therefore unavailable) will not build up a significant pressure in chamber 109. Preventing such pressure buildup assures that closing of the movable blast valve member 36 will not be initiated until the pilot valve member 71 has returned to nearly its fully closed position of FIG. 3.
  • the rate at which pressure is built up in blast valve closing space 109 can be controlled by a needle valve 120 that can be adjusted to control the rate of flow through the pressure equalizing passages 69, 73, 72, 86, 82, 110.
  • the pilot valve reset chamber 87 is vented through small :bleed passages 123 and 124 communiicating with passage 80 and then through passages 82 and 84. Venting of these chambers at -this time serves the desirable function of assuring that on a subsequent operation, p-ressures will be built up in these chambers from the same reference level, i.e. atmospheric pressure. This helps to assure that the blast valve and contact opening times will not vary appreciably from -one opening operation to the next. Also venting the blast valve closing chamber 109 assures that therewill be no pressure in this chamber acting downwardly on'the ends of rods 64 to interfere with a subsequent circuit breakerclosing operation, when the rods 64 move upwardly through chamber 109, as will soon be described.
  • passages 123 and 124 leading into pilot valve reset chamber 87 function as a portion of a pneumatic lock for holding the pilot valve closed during the period between return of the pilot Valve to its closed position and return of the blast valve member 36 -to its closed position. More specifically, these passages 123, 124 assure that the pilot valve will not be opened unintentionally by any pressure differential developing on opposite sides of the booster piston 75 while the blast valve member 36 is open and booster chamber '78 is therefore unvented. In this regard, these passages 123, 124 maintain communication between chambers 78 and S7 on opposite sides of the booser piston 75 while the pilot valve is in closed position.
  • booster piston actuating chamber 78 any high pressure present in booster piston actuating chamber 78 will also be present in the reset chamber 87, and there will be a net force on booster piston 75 acting in a pilot valve-closing direction to hold the pilot valve closed in view of the relatively large closing ⁇ area 75b as compared to opening ⁇ area 79.
  • passage 123 is a small bleed passage and, due to its small size, does not permit much high pressure to flow into chamber 87 during the brief period before the passage 123 is covered by an Venlarged portion 126 on movable pilot valve member 71. Near the end of a pilot valve-opening stroke, this enlarged portion 126 acts as a dash-pot piston in a cylinder 12,7. Air displaced from cylinder 127 by piston 126 is forced through passage 124 which becomes progressively more restricted as the pilot valve member 71 reaches the end of its opening stroke.
  • FIG. 4 shows the crosshead 30' and the interconnected contact 24 in their open positions of FIG. 4 despite the above-described return of the blast valve member 36 to its closed position.
  • a suitable roller 132 carried by the crosshead 30 normally holds the latch 130 in a released position.
  • FIG. 3a shows the position of these parts when the circuit breaker is closed.
  • the control piston 102 that was moved downwardly to initiate pilot valve-opening is similarly held in its lowermost position of FIG. 4 by a suitable latch schematically depicted at 140.
  • a reset spring 142 acts on rod 104 to bias the control piston 102 upwardly toward its initial position of FIG. 2, but the latch retains the control piston 102 in its lowermost position so long as it is desired to hold the circuit breaker open.
  • Closing of the circuit breaker is effected by suitably tripping the latch 140, as by energizing .a solenoid 144.
  • the solenoid responds by driving its plunger to the right against a latch reset spring 145, the mainspring 142 drives the rod 104 and piston 102 upwardly.
  • the contact-restraining latch 130 is tripped (through a linkage, not shown, that interconnects rod 104 and the lat-ch 130). Tripping of the latch 130 allows the high pressure air acting on Ithe crosshead structure 30, 64 to drive the crosshead 30 upwardly, thereby pivoting the movable contact 24 of FIG.
  • the contact-closing speed is controlled by piston attached to the crosshead 30.
  • This piston 150 is slidably mounted in a stationary cylinder 152 having a large opening 154 therein. Initial closing motion takes place at high speed Isince the air in cylinder 152 ahead of the upwardly moving piston 150 can be freely expelled through opening 154. But when the upwardly moving piston 150 passes the opening, the air ahead of it is forced through a restricted passage 156 at a controlled rate, thus providing a dashpot action that smoothly terminates upward closing movement of the piston 150 and the connected contacts.
  • a passage 157 containing a check valve 158 is provided in the piston to allow air to ow upwardly into the space above the piston should a reduced pressure be developed in this space.
  • a passageway 160 is provided leading from the high pressure tank into the cylinder space behind the piston 60.
  • a check valve 162 in this passage 160 allows air to flow upwardly therethrough into the space behind the piston 60 as it moves upwardly. This check valve prevents air from flowing through passage 160 during an opening operation.
  • a special advantage of our blast valve control arrangement is that it enables the amount of air consumed by each interrupting operation to be easily adjusted. This air consumption depends upon the length of time that the movable blast valve member 36 is open during an interrupting operation. We can easily control this period of time by adjusting the needle valve 108.
  • This adjustment of needle valve 108 varies the time elapsing between entry of the movable blast valve into its fully open position of FIG. 4 and the instant at which it begins to return to its closed position (since such adjustment controls the rate at which the pilot valve member 71 recloses, and blast valve-reclosing cannot begin until the pilot valve is almost fully reclosed, as was explained hereinabove).
  • needle valve 108 does not significantly affect the speed at which the blast valve member 36 moves during reclosing but only the length of the time that the blast valve member remains in its fully open position.
  • the upper ends of the two needle valves 108 and 120 are exposed to atmosphere, and an operator has ready access to them from the top of the circuit breaker without any need for entering the pressurized tank 12. By consulting the usual tank pressure gage (not shown) before and after a given opening operation, he can easily determine the extent to which adjustments of the needle valve 108 have affected air consumption.
  • a gas blast circuit breaker comprising a pair of contacts separable to establish an arc therebetween and blast-control means for creating a gas blast through the region of the arc to aid in extinguishing the arc, said blastcontrol means comprising:
  • said pilot valve comprising a movable pilot valve member having a normally-closed position for blocking communication between said high pressure source and said blast valve opening surface and an open position for affording communication between said high pressure source and said blast valve opening surface
  • an actuating element for said movable pilot Valve member having a pilot valve-closing surface on which high pressure fluid is adapted to act in a direction to close said pilot valve member after opening movement thereof,
  • circuit breaker of claim 2 in combination with a housing for high pressure fluid in which said blast-control means is located, and said adjustable flow control means having a portion extending between the inside and outside of said housing to permit adjustments thereof to be made from outside said high pressure housing Without entering said housing.
  • circuit breaker of claim 1 in combination with means responsive to return of said pilot valve member to its normally-closed position for returning said blast Valve member to its normally-closed position.
  • said means for holding said pilot valve member open comprises an opening surface on the actuating element for said pilot valve member and means for supplying high pressure fluid to said opening surface when said pilot valve member is moved toward open position.
  • a gas blast circuit breaker comprising a pair of contacts separable to establish an are therebetween and blast-control means for creating a gas blast through the region of the arc to aid in extinguishing the arc, said blast-control means comprising:
  • a movable blast valve member having a normallyclosed position and being movable from said normally-closed position toward a fully-open position to create sa-id gas blast
  • said pilot valve comprising a movable pilot valve member having a normally-closed position for blocking communication between said high pressure source and said blast valve opening surface and an open Il position for affording communication between said high pressure source and said blast valve opening surface,
  • said actuating means for said blast valve member having a blast valve-closing surface on which pressurized iluid is adapted to act in a blast valve-closing direction;
  • circuit breaker of claim 7 in combination with means responsive to return of said pilot valve to its normally-closed position for returning said blast valve member to its normally-closed position.
  • circuit breaker of claim 9 in combination with:
  • said adjustable means having -a portion extending from a point inside said lhousing to a point outside said housing to permit adjustments thereof to be effected from outside said high pressure housing Without entering said housing.
  • said actuating means for said blast valve member having a blast valve closing surface on which pressurized fluid is adapted to act in a blast valve closing direction;
  • said ⁇ actuating means for said blast valve member having a blast valve closing surface on which pressurized fluid is adapted to act in a blast valve closing direction;
  • venting means responsive to entry of said movable blast valve member into substantially its normally closed position for venting said blast valve opening surface to a low pressure region.
  • said actuating means for said blast valve member having a blast valve closing surface on which pressurized fluid is adapted to act in a blast valve closing direction;
  • venting means responsive to entry of said movable blast valve member into substantially its normally closed position for venting said blast valve opening surface and said blast valve closing surface to a low pressure region.
  • a gas blast circuit breaker comprising a pair of contacts separable to establish an arc therebetween and blast-control means for creating a gas blast through the region of the arc to aid in extinguishing the arc, said blast-control means comprising:
  • said pilot valve comprising a movable pilot valve member having a normally-closed position for blocking communication between said high pressure source and said blast valve opening surface and an open position for affording communication between said high pressure source and said blast valve opening surface
  • pilot valve control means operable when coupled to said pilot valve member for actuating said pilot valve member in an opening direction
  • circuit breaker of claim 14 in combination with means responsive to return of said pilot valve member to its normally closed position for returning said blast valve member to its normally closed position.

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  • Actuator (AREA)
  • Circuit Breakers (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Fluid-Driven Valves (AREA)
US421777A 1964-12-29 1964-12-29 Means for controlling the blast valve of a gas blast circuit breaker Expired - Lifetime US3336454A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DENDAT1515781 DE1515781A1 (fr) 1964-12-29
US421776A US3336453A (en) 1964-12-29 1964-12-29 Means for controlling the blast valve and contacts of a gas blast circuit breaker
US421777A US3336454A (en) 1964-12-29 1964-12-29 Means for controlling the blast valve of a gas blast circuit breaker
GB49858/65A GB1098380A (en) 1964-12-29 1965-11-24 A gas blast circuit breaker
DE19651515789 DE1515789A1 (de) 1964-12-29 1965-12-11 Elektrischer Schalter mit einer Geblaeseeinrichtung
CH1792965A CH457583A (de) 1964-12-29 1965-12-28 Druckgasschalter
FR43968A FR1462615A (fr) 1964-12-29 1965-12-28 Organes de contrôle de la soupape de soufflage et des contacts d'un interrupteur àsoufflage gazeux

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US421776A US3336453A (en) 1964-12-29 1964-12-29 Means for controlling the blast valve and contacts of a gas blast circuit breaker
US421777A US3336454A (en) 1964-12-29 1964-12-29 Means for controlling the blast valve of a gas blast circuit breaker

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US3336454A true US3336454A (en) 1967-08-15

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US421777A Expired - Lifetime US3336454A (en) 1964-12-29 1964-12-29 Means for controlling the blast valve of a gas blast circuit breaker
US421776A Expired - Lifetime US3336453A (en) 1964-12-29 1964-12-29 Means for controlling the blast valve and contacts of a gas blast circuit breaker

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US421776A Expired - Lifetime US3336453A (en) 1964-12-29 1964-12-29 Means for controlling the blast valve and contacts of a gas blast circuit breaker

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US (2) US3336454A (fr)
CH (1) CH457583A (fr)
DE (2) DE1515789A1 (fr)
FR (1) FR1462615A (fr)
GB (1) GB1098380A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3505488A (en) * 1967-01-27 1970-04-07 Ite Imperial Corp Stationary contact structure forcing blow out shaped current path
US3683142A (en) * 1970-05-27 1972-08-08 Asea Ab Operating means for electric switching apparatus for high voltage

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3780244A (en) * 1972-10-18 1973-12-18 Gen Electric Gas blast circuit breaker of the axial blast type
DE2317499C3 (de) * 1973-04-04 1975-12-18 Siemens Ag, 1000 Berlin Und 8000 Muenchen Druckgasschalter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2783337A (en) * 1953-12-10 1957-02-26 Gen Electric Fluid blast circuit interrupter
US2783338A (en) * 1955-09-21 1957-02-26 Gen Electric Operating mechanism for a fluid-blast circuit breaker
US3214540A (en) * 1960-10-03 1965-10-26 Westinghouse Electric Corp Interrupting structures and control for compressed-gas circuit interrupters

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2783337A (en) * 1953-12-10 1957-02-26 Gen Electric Fluid blast circuit interrupter
US2783338A (en) * 1955-09-21 1957-02-26 Gen Electric Operating mechanism for a fluid-blast circuit breaker
US3214540A (en) * 1960-10-03 1965-10-26 Westinghouse Electric Corp Interrupting structures and control for compressed-gas circuit interrupters

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3505488A (en) * 1967-01-27 1970-04-07 Ite Imperial Corp Stationary contact structure forcing blow out shaped current path
US3683142A (en) * 1970-05-27 1972-08-08 Asea Ab Operating means for electric switching apparatus for high voltage

Also Published As

Publication number Publication date
FR1462615A (fr) 1966-12-16
CH457583A (de) 1968-06-15
GB1098380A (en) 1968-01-10
DE1515789A1 (de) 1970-01-22
DE1515781A1 (fr)
US3336453A (en) 1967-08-15

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