US3604871A - Gas blast circuit-interrupting device having quick-acting contact release means - Google Patents

Gas blast circuit-interrupting device having quick-acting contact release means Download PDF

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Publication number
US3604871A
US3604871A US12172A US3604871DA US3604871A US 3604871 A US3604871 A US 3604871A US 12172 A US12172 A US 12172A US 3604871D A US3604871D A US 3604871DA US 3604871 A US3604871 A US 3604871A
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US
United States
Prior art keywords
contact
contact means
circuit
interrupting device
piston
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
US12172A
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English (en)
Inventor
Karl Kriechbaum
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
Original Assignee
Licentia Patent Verwaltungs GmbH
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
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Publication of US3604871A publication Critical patent/US3604871A/en
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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
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/285—Power arrangements internal to the switch for operating the driving mechanism using electro-dynamic repulsion
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/80—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve
    • H01H33/82—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve the fluid being air or gas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/80—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve
    • H01H33/82—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve the fluid being air or gas
    • H01H33/83—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve the fluid being air or gas wherein the contacts are opened by the flow of air or gas

Definitions

  • a spring biases one of the contacts toward the other; and a quick-acting release device, such as a piston ring lock, holds the other contact against the first contact under high contact pressure when the interrupting device is in its switch-on position.
  • the contact that is retained by the release device is biased only by the quenching gas in the switch-off direction.
  • the release device releases this contact, the two contacts separate from each other very rapidly. The contacts are sealed so that the quenching gas can not escape through the hollow bore of the contacts until they have separated.
  • the release device may be provided with a suitable device to compensate for temperature fluctuations.
  • the actuation of the release device may occur in dependenceon the net current in the circuit, so that the separation of the tubular contacts occurs under minimum arc duration and, thus, with minimum switching effort.
  • the present invention relates to a circuit-interrupting device having extremely short switch-ofi' times, in which two hollow contact elements are disposed under high contact pressure within a chamber filled with a gaseous-quenching medium.
  • Such pressure chamber breakers which interrupt a shortcircuit current within one or two half-waves, are known in which the movable, hollow contact elements are separated by electrodynamic forces; the flow of pressurized air into the switching path taking over the further movement of the contact elements into their end positions, as well as the quenching of the arc.
  • electrodynamic actuators disposed at high voltage potential require high technical expenditures, since the actuation instruction must be brought from ground potential to high-voltage potential, and the capacitor which initiates the charging of the actuating jolt, and which is at highvoltage potential, must receive its charging current by way of transformers which are insulated against high voltages.
  • Another more simply constructed pressure chamber circuit breaker provides a rapid actuation in such a manner that the air is removed from an annular chamber provided directly at the switching path, so that the air pressing from the outside onto a diaphragm reaches the rear of a drive piston for the movable hollow contact element and, thus, effects separation of the contact elements.
  • a very high switching speed can not be achieved in this manner, since the removal of air and the subsequent influx of air requires a longer period of time because of the inertia of the flowing air. Further, the drive must also operate against the air pressure at hand.
  • one hollow contact element is constructed in a known manner to be a follower contact under high pressure and the other movable contact element, which is only under the pressure of the quenching medium effective in the switchoff direction, is held in the switched-on position by an extremely rapidly actuatable arresting device.
  • This embodiment of the breaker makes it possible, on the one hand, to apply high contact pressure and, on the other hand, to achieve high acceleration of the hollow contact elements in the switch-off direction after the arresting device has been triggered, since no counterforces act against the switch-off movement.
  • the arresting device when it is actuated electrodynarnically, can be triggered within a few milliseconds.
  • Such an arresting device advantageously consists of a piston ring disposed in an annular groove of the drive piston of the movable hollow contact element, which piston ring is resilient in the plane perpendicular to the axis of movement of the contact element, and of a ring-shaped groove arranged in the drive cylinder to correspond to the switched-on position.
  • FIG. 1 shows a switching chamber 2 resting on a suitable support member 1.
  • the switching path of the switching chamber 2 is in a glass fiber-reinforced pressure chamber 3 which contains a suitable quenching fluid, such as a gas under pressure.
  • a suitable quenching fluid such as a gas under pressure.
  • the construction of such chambers is well known in the art.
  • the switching chamber 2 is only part of a double system.
  • the other omitted switching chamber is similar or has the equal dimensions and contains the equal parts. It is clear that both switching chambers 2 are Sll'I'lI-IHHHQ? ously operated in the same way.
  • a pair of guide elements 8 and 35 are arranged in the interior of the pressure chamber 3, so as to guide a pair of movable, tubular contacts 4 and 5. Annular contacts 8' and 35are ar ranged between the guides 8 and 35 and the contacts 4 and 5, respectively, so as to transfer the current from the solid parts to the movable contacts 4 and 5.
  • a strong cup, or annular, spring 6 is arranged between an inner wall of pressure chamber 3 and an annular abutment 7.on contact 4, so as to bias contact 4 toward contact 5.
  • Guide 8 is so designed that the surface of abutment 7 opposite to that surface-engaging spring 6 will engage surface 36 of guide Q after contact 4 has moved a predetermined distance in the direction of contact 5, and thus limit its movement.
  • a locking member l i which is preferably a flat lever element (see 2) loclts the piston and hence indirectly contact 5 against contact 4, and also against the pressure of spring 6 and the que ching gas, by exp s piston n 2 so h it i multanss ilx' seated. in grooves 10 and 28.
  • a recess 10' is provided in a section of the outer periphery of flange 9' to enable locking member to f t between the opening in piston ring 27.
  • the actuation of the arresting device occurs through an insulating rod 23 which engages a crank 24 (see FIGS. 1 and 2).
  • the crank 24 itself is rigidly connected with a crankshaft 25.
  • Locking members 11 are fastened to the ends of this crankshaft. As described above, these locking members, under the bias of spring 26 (FIG. 2) move between resilient piston ring 27 and, thus, spread the ring apart.
  • the piston ring 27 engages groove in the drive piston 9 as well as groove 28 in wall portion 37 of guide member 35.
  • the release device through member 11 blocks the movement of the contact 5 away from biased contact 4, in consequence of which contacts 4 and 5 are held in engagement with each other, when the member 11 blocks the movement of contact 5, by the force exerted by the spring 6 and, when said member 11 is actuated and unblocks contact 5, contact 5 moves away from contact 4 under the influence of the pressure of the quenching fluid on piston 9, with contact 4 being prevented from following contact 5 by abutment 7 engaging face member 36.
  • a hydraulic compensating device 40 may also be included in the path of the insulating rod 23. This device makes it possible to compensate for changes in the length of this rod due to temperature fluctuations.
  • the lower portion 23 of the rod 23 hangs from a piston element 29 and the upper rod portion23" is attached to a piston element 30.
  • the pistons 29 and 30 are housed in a liquid-filled container and mesh together so that they form three compartments in fluid communication with each other. When the insulating rod performs small, slow movements, there might occur an exchange of liquid between the two intermeshed piston elements without changing the position of the locking member 11.
  • Rod 23 When rod 23 performs a switch-off movement, however, the liquid cannot be compensated quickly enough below and above elements 29 and 30, so that this movement is completely transferred to thelocking member 11 as desired.
  • Rod 23 is continuously under the pressure of high-pressure air entering housing 31 through conduit 40.
  • the lower end of rod 23 is attached to a drive piston 31 which is also held in the normal, or closed, position by a piston ring lock 32, biased into the locked position by spring 41.
  • the locking member 32 in this case is actuated electrodynamically, in a known manner, by means of closing a solenoid-and-plunger switch 42 and sending an impulse from a conventional power source 44 discharging through a suitable, known capacitor 33 to a suitable solenoid device 43.
  • the actuation of piston 31 may occur in dependence on the steepness of the net current, so that the separation of the contacts occurs under minimum arc duration and, thus, with minimum switching effort. In this manner, the breaker can act as a synchronous switch.
  • a circuit-interrupting device having extremely short switch-off times comprising, in combination:
  • first and second contact means arranged in said chamber for movement into and out of engagement with 'each other;
  • quick-acting release means for blocking the movement of said second contact means away from said first contact means under the influence of said means (e), in consequence of which said first and second contact means are held in engagement with each other, when said release means blocks the movement of said second means, by the force exerted by said biasing means and, when said release means are actuated and unblock said second contact means, the latter are moved away from said first-contact means under the influence of said means (e) with said first-contact means being prevented from following said second contact means by said means (d).
  • a circuit-interrupting device as defined in claim 1 further including guide means defining a cylinder having flattened recess and arranged about said second-contact means and wherein said pressure-responsive means is a piston means with an annular recess and is arranged within said guide means, and said release means includes a piston ring arranged in said annular recess and means to spread out said piston ring so that it will simultaneously engage said annular recess in said piston and said flattened recess in said guide means to lock said second contact means in the switch-on position.
  • a circuit-interrupting device as defined in claim 3 wherein said means for rotating said crankshaft is an electrodynamic trigger actuated in dependence on the steepness of the net current such that the separation of said first and second-contact means occurs with a minimum duration of the arc and minimum switching effort.
  • said actuating means further includes hydraulic-compensating means having a pair of intermeshing piston elements each mounted on a respective rod element and a fluid bath in which the piston elements are arranged so that changes in the overall length of the rod elements during temperature fluctuations are compensated.
  • a circuit-interrupting device as defined in claim 1! herein said spring element is an annular spring.

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  • Circuit Breakers (AREA)
  • Switch Cases, Indication, And Locking (AREA)
US12172A 1969-04-05 1970-02-18 Gas blast circuit-interrupting device having quick-acting contact release means Expired - Lifetime US3604871A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1917724A DE1917724C3 (de) 1969-04-05 1969-04-05 Leistungsschalter für sehr kurze Ausschaltzeiten

Publications (1)

Publication Number Publication Date
US3604871A true US3604871A (en) 1971-09-14

Family

ID=5730548

Family Applications (1)

Application Number Title Priority Date Filing Date
US12172A Expired - Lifetime US3604871A (en) 1969-04-05 1970-02-18 Gas blast circuit-interrupting device having quick-acting contact release means

Country Status (13)

Country Link
US (1) US3604871A (de)
JP (1) JPS5228990B1 (de)
AT (1) AT300941B (de)
BE (1) BE745246A (de)
CH (1) CH511507A (de)
DE (1) DE1917724C3 (de)
ES (1) ES375952A1 (de)
FR (1) FR2038254A1 (de)
GB (1) GB1287517A (de)
IL (1) IL33811A (de)
NL (1) NL7001135A (de)
NO (1) NO128466B (de)
SE (1) SE369351B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE18318T1 (de) * 1982-01-28 1986-03-15 Bbc Brown Boveri & Cie Hochspannungsschalter und dessen verwendung.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3002073A (en) * 1958-04-16 1961-09-26 Gen Electric Electric circuit interruption device and method
US3095488A (en) * 1960-06-29 1963-06-25 Bbc Brown Boveri & Cie Compressed air switch with electrically controlled blasting of the switching gaps
US3213334A (en) * 1962-12-01 1965-10-19 Asea Ab Latching mechanism for circuit breakers
US3244844A (en) * 1962-12-24 1966-04-05 Ite Circuit Breaker Ltd Energy storage operating means for air blast circuit breakers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3002073A (en) * 1958-04-16 1961-09-26 Gen Electric Electric circuit interruption device and method
US3095488A (en) * 1960-06-29 1963-06-25 Bbc Brown Boveri & Cie Compressed air switch with electrically controlled blasting of the switching gaps
US3213334A (en) * 1962-12-01 1965-10-19 Asea Ab Latching mechanism for circuit breakers
US3244844A (en) * 1962-12-24 1966-04-05 Ite Circuit Breaker Ltd Energy storage operating means for air blast circuit breakers

Also Published As

Publication number Publication date
SE369351B (de) 1974-08-19
BE745246A (fr) 1970-07-01
AT300941B (de) 1972-08-10
IL33811A0 (en) 1970-03-22
NL7001135A (de) 1970-10-07
DE1917724B2 (de) 1973-03-29
DE1917724A1 (de) 1970-12-10
CH511507A (de) 1971-08-15
DE1917724C3 (de) 1973-10-18
JPS5228990B1 (de) 1977-07-29
ES375952A1 (es) 1972-04-16
GB1287517A (en) 1972-08-31
NO128466B (de) 1973-11-19
FR2038254A1 (de) 1971-01-08
IL33811A (en) 1974-06-30

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