US3440379A - Gas-blast circuit breaker with multiple interruption - Google Patents

Gas-blast circuit breaker with multiple interruption Download PDF

Info

Publication number
US3440379A
US3440379A US571290A US57129066A US3440379A US 3440379 A US3440379 A US 3440379A US 571290 A US571290 A US 571290A US 57129066 A US57129066 A US 57129066A US 3440379 A US3440379 A US 3440379A
Authority
US
United States
Prior art keywords
auxiliary
contact members
gas
exhaust valve
switching point
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
US571290A
Other languages
English (en)
Inventor
Carl-Dieter Floessel
Gerhard Mauthe
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.)
BBC Brown Boveri AG Germany
BBC Brown Boveri France SA
Original Assignee
BBC Brown Boveri France SA
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
Application filed by BBC Brown Boveri France SA filed Critical BBC Brown Boveri France SA
Application granted granted Critical
Publication of US3440379A publication Critical patent/US3440379A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01H33/16—Impedances connected with contacts
    • H01H33/168—Impedances connected with contacts the impedance being inserted both while closing and while opening the switch
    • 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

  • the invention concerns a gas-blast circuit breaker with multiple interruption where the power switching points are arranged in pairs in switch chambers which are kept under gas pressure and with an auxiliary switching point in series with a resistor located in parallel with each power switching point, at least the auxiliary switching point being in an auxiliary switch chamber which is also constantly subjected to a gas pressure.
  • the hollow, stationary switching elements belonging to the power interrupting points and directed towards each other are provided with a common exhaust valve which opens for a short time. It is known to assemble gas-blast circuit breakers with multiple interruption in such a manner that their power switching points are arranged in pairs in so-called double extinguishing chambers.
  • auxiliary switching points serve to connect the resistors in parallel with the power switching points when the breaker opens and to disconnect them again after the opening operation, so that they are not continuously under voltage.
  • Conventional auxiliary switching points are provided for this purpose with their own actuating mechanism. With separate drives it is, however, diilicult to adjust these in such a manner that the switch contacts of the auxiliary switching points operate simultaneously both mutually and as regards the power interrupting points. Also a separate actuating mechanism for each auxiliary switching point involves considerable costs both as regards fabrication and assembly.
  • the object of the present invention is to remedy this and provide a simple and cheap solution for actuating the auxiliary switching contacts, whereby at the ⁇ same time it is possible to subject the auxiliary switching points to a gas-blast.
  • FIGURE 1 shows the improved gas-blast circuit breaker in vertical section
  • FIGURE 2 ⁇ shows further constructional example according to the invention also in vertical section.
  • FIGURE 3 is a partial view in section of a modified embodiment of the invention shown to a larger scale.
  • Each switch chamber contains a stationary switch contact 4 and a movable switch contact 5.
  • the switch contacts 4, 5 form a power interrupting point.
  • the movable switch contact 5 is connected by way of a rod 6 to a driving piston 7 which is subjected to the pressure of a spring 8.
  • Reference numeral 9 indicates a sliding contact which conducts the current from the switch contact 5 to the external terminal 10, and 11 is a tubular valve element which, by means of ribs and a rod, is connected to the piston 12.
  • Control pipe 13 communicates both with the space below piston 12 and the space on the right side of the driving piston 7.
  • the other end of the pipe 13, not shown in the drawing, is connected to a conventional control valve.
  • a valve casing 14 is mounted on the middle of the intermediate piece 2. It isprovided with openings 15 which communicate with the outside air and, in the position shown, are shut off from the inside of the stationary hollow switch contacts 4 by the valve element 16.
  • the hollow rod 17 connects on the one hand the valve element 16 rigidly to the piston 18 which is under the influence of the recall spring 19, and on the other hand the upper end of rod 17 is connected to bell crank levers 20 pivoted at 21, the other ends of these levers being hinged to the movable hollow auxiliary contacts 23.
  • Pipe 22 is connected at one end to the space below piston 18 and at the other end, not shown, to a conventional control valve.
  • auxiliary switch contact 23 together with the stationary auxiliary switch contact 25 forms an auxiliary switching point which is in series with the resistor 26.
  • Parts 23, 25, 26 are inside the auxiliary chamber 27 which communicates with switch chamber 3 by way of pipe 28 which also acts as a current lead.
  • FIGURE 1 operates as follows: In the position shown, the circuit breaker is closed. The power interrupting contacts 4, 5 are closed, whilst the auxiliary switch contacts 23, 25 are open. Switch chambers 3 as well as auxiliary switch chambers 27 are lled with pressure gas, since the hollow supporting insulator 1 is connected to a pressure gas reservoir, not shown in the drawing. In order to open the breaker, pressure -gas is allowed to flow through control pipes 13, 22n to the underside of pistons 7, 12 and 18 respectively. Piston 18, due to its upward movement, causes valve element 16 to be lifted from the seating ring 16a so that the interior of the hollow switch contact 4 is in communication through the openings 15 with the atmosphere and is thus vented.
  • Parts 16, 16a therefore form a common exhaust valve for the hollow switch contacts 4.
  • space 24 is also vented by way of the hollow rod 17, and the hollow auxiliary switch contacts 23 coupled to rod 17 by crank levers 20 are brought into the closed position.
  • the hollow auxiliary contacts 23 are practically shut oi in a sufficiently gas-tight manner by the stationary hollow auxiliary contacts 25 so that no appreciable amount of gas can flow from the auxiliary chamber 27 through the hollow contactsj 23 into the space 24.
  • the pneumatic conditions in the control pipes 13, 22 are mutually so adjusted that the auxiliary switching points 23, 25 are already closed when the power interrupting points 4, 5 are open.
  • control pipes 13, 22 are vented. Whilst the outer exhaust valves 11 and also the middle common exhaust valves 16, 16a are closed and remain inoperative and thus also both movable auxiliary switch contacts 23 retain their open position, only the power switching points 4, 5 are closed under the action of the springs 8.
  • the cornmon exhaust valve is opened for a short time during the opening operation and, due to the coupling with the auxiliary switching contact which switches the resistor in parallel with the power switching point for a short time, it becomes effective as a disconnecting resistor.
  • the exhaust valve remains, however, closed and the auxiliary contact open, so that the resistor is not effective.
  • the opening resistor also as a closing resistor, that is to close the auxiliary switching contacts shortly before the power interrupting point is closed and after it is closed to reopen the auxiliary switching point again.
  • the hollow rod with an actuating piston that has a bore-hole, the piston being located in a cylinder where the space below the piston is connected by way of a non-return valve which opens in the inflow direction and the space above the piston is connected by way of a non-return valve which opens in the outflow direction to the control pipe.
  • control pipe 22 which communicates with the space 32 below the perforated piston 18 contains the non-return valve 30 which can open in the inow direction.
  • Space 33 above piston 18 is in communication with control pipe 22 by way of a pipe 35 and the non-return valve 31, which opens in the direction of pipe 22. This latter valve can only open when pressure gas Hows back from space 33 into control pipe 22.
  • the switching-in arc is subjected to a gas-blast. In certain cases it is, however, possible to omit the gas-blast whereby a saving in pressure gas can be achieved.
  • FIGURE 3 illustrates such a modified form of the invention.
  • the same elements as in FIGURE 2 are designated by the same reference numerals.
  • the hollow rod 17 together with its piston y18 is located in cylinder 34. lIn this case it is, however, not connected to the exhaust valve 45 but can slide inside the latter.
  • Exhaust valve 45 possesses a piston 40 which is rigidly connected to it and has a borehole 40a, whereby space 32 is shut off from space 44. The latter is in communication with chamber ⁇ 43 by way of a passage 42.
  • rod 17 is also moved upwards by the valve 45l due to the intermediate ring 41.
  • control pipe 22 When for the switching-out, control pipe 22 is supplied with pressure gas, the gas passes through the non-return valve 30, which commences to open, into the space 32 below piston 40 and opens on the one hand exhaust valve 45 and lifts on the other hand rod 17, whereby the auxiliary switching contacts 23 are brought into the closing position by ⁇ way of crank levers 20.
  • piston 18 does not perform any Work.
  • spaces 44 and 43 are lilled with gas which passes through boreholes ⁇ 40a and 18a and also chamber 43 is lled by way of passage 42.
  • Spring 19 returns rod 17 and exhaust 4S to the position shown in the ligure.
  • Pressure gas also passes through borehole 45a to the upper side of exhaust valve 45 and keeps it closed due to the larger effective surface.
  • nonret'urn valve 31 opens and space 33 is rapidly vented by way of pipe 35 so that piston 18 and thus rod 17 are forced upwards.
  • Space 44 and chamber 43 serve to provide the necessary driving volume, because the pressure gas can only escape slowly through the borehole 18a.
  • Exhaust valve 45 therefore remains stationary, because as already stated it is maintained in the closed position by a pneumatic force.
  • the gas in spaces 32, 33, 44 also escapes through boreholes 18a, 40a and 42, so that spring 19 moves rod 17 back into the position shown, whereby auxiliary switch contacts 23 are caused to move into the open position.
  • the constructional form according to FIGURE 3 enables, by omitting the intermediate ring 41, the circuit breaker to be modified in such a manner that the resistor is only effective during the switching-in operation in that when switching-out, the exhaust valve only opens briefly as described without causing rod 17 to be moved and auxiliary contacts 23 to be closed.
  • a circuit breaker of the gas-blast type comprising at least two pairs of relatively movable power switching contact members located within a gas-pressurized main switching chamber and interconnected to establish two series connected power switching points, one of sai-d contact members of each pair being stationary and of the nozzle tube type with its nozzle end adapted to be engaged with and disengaged from the other contact member, the other ends of said stationary nozzle tubes terminating in a common exhaust valve through which the gases in said switching chamber are exhaused to atmosphere when said contact members disengage, an auxiliary switching point -for each power switching point, each said auxiliary switching point being constituted by a pair of relatively movable auxiliary contact members located within a gas-pressurized auxiliary switching chamber, one of said auxiliary contact members of each auxiliary switching point being of the tubular type with one end thereof adapted to be engaged with and disengaged from the other auxiliary contact member, a resistor connected in a series circuit lwith said auxiliary contact members and which series circuit is connected in parallel with the

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Circuit Breakers (AREA)
  • Safety Valves (AREA)
  • Reciprocating Pumps (AREA)
  • Multiple-Way Valves (AREA)
US571290A 1965-09-06 1966-08-09 Gas-blast circuit breaker with multiple interruption Expired - Lifetime US3440379A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1239565A CH425949A (de) 1965-09-06 1965-09-06 Druckgasschalter mit Mehrfachunterbrechung
CH1481665A CH440413A (de) 1965-09-06 1965-10-27 Druckgasschalter mit Mehrfachunterbrechung

Publications (1)

Publication Number Publication Date
US3440379A true US3440379A (en) 1969-04-22

Family

ID=25710170

Family Applications (1)

Application Number Title Priority Date Filing Date
US571290A Expired - Lifetime US3440379A (en) 1965-09-06 1966-08-09 Gas-blast circuit breaker with multiple interruption

Country Status (6)

Country Link
US (1) US3440379A (pl)
CH (2) CH425949A (pl)
DE (2) DE1214299B (pl)
FR (1) FR1491175A (pl)
GB (1) GB1103720A (pl)
SE (1) SE301671B (pl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0050341A2 (en) * 1980-10-20 1982-04-28 Hitachi, Ltd. Gas circuit breaker of the resistance breaking type

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JPS5840715A (ja) * 1981-09-04 1983-03-09 株式会社東芝 しや断器
FR2896335B1 (fr) * 2006-01-17 2008-11-14 Areva T & D Sa Disjoncteur de generateur avec resistance inseree
FR2985081B1 (fr) 2011-12-21 2015-03-06 Alstom Technology Ltd Dispositif de protection contre les particules engendrees par un arc electrique de commutation
FR2996352B1 (fr) 2012-10-02 2014-10-31 Alstom Technology Ltd Dispositif de contact electrique de type doigt de contact a fort courant nominal

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR979029A (fr) * 1942-03-23 1951-04-20 Delle Atel Const Electr Dispositifs de commande pour disjoncteurs électriques munis d'un sectionneur
FR71769E (fr) * 1957-03-19 1960-01-19 Alsthom Cgee Nouvelles dispositions pour interrupteurs et disjoncteurs électriques à gaz sous pression
US3054877A (en) * 1957-06-07 1962-09-18 Bbc Brown Boveri & Cie Compressed air actuated electric switch with power switching contacts and voltage disconnecting contacts
US3163737A (en) * 1960-03-23 1964-12-29 English Electric Co Ltd Gas blast circuit breaker and operating means therefor
US3211869A (en) * 1961-02-24 1965-10-12 English Electric Co Ltd Gas-blast electric circuit-breaker having contact fingers biased against auxiliary contact after disengagement from throat contact
US3358105A (en) * 1963-11-16 1967-12-12 English Electric Co Ltd Gas blast circuit breaker and operating means therefor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR979029A (fr) * 1942-03-23 1951-04-20 Delle Atel Const Electr Dispositifs de commande pour disjoncteurs électriques munis d'un sectionneur
FR71769E (fr) * 1957-03-19 1960-01-19 Alsthom Cgee Nouvelles dispositions pour interrupteurs et disjoncteurs électriques à gaz sous pression
US3054877A (en) * 1957-06-07 1962-09-18 Bbc Brown Boveri & Cie Compressed air actuated electric switch with power switching contacts and voltage disconnecting contacts
US3163737A (en) * 1960-03-23 1964-12-29 English Electric Co Ltd Gas blast circuit breaker and operating means therefor
US3211869A (en) * 1961-02-24 1965-10-12 English Electric Co Ltd Gas-blast electric circuit-breaker having contact fingers biased against auxiliary contact after disengagement from throat contact
US3358105A (en) * 1963-11-16 1967-12-12 English Electric Co Ltd Gas blast circuit breaker and operating means therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0050341A2 (en) * 1980-10-20 1982-04-28 Hitachi, Ltd. Gas circuit breaker of the resistance breaking type
EP0050341A3 (en) * 1980-10-20 1983-02-02 Hitachi, Ltd. Gas circuit breaker of resistance breaking type

Also Published As

Publication number Publication date
DE1225263B (de) 1966-09-22
CH425949A (de) 1966-12-15
DE1214299B (de) 1966-04-14
GB1103720A (en) 1968-02-21
CH440413A (de) 1967-07-31
FR1491175A (fr) 1967-08-04
SE301671B (pl) 1968-06-17

Similar Documents

Publication Publication Date Title
US2459600A (en) Compressed gas circuit interrupter
US2665351A (en) Arrangement in air blast circuit breaker provided with damping resistance
US2933575A (en) Circuit interrupters
US2748226A (en) Compressed-gas circuit interrupter
US3052783A (en) Compressed-gas circuit interrupters
US2783338A (en) Operating mechanism for a fluid-blast circuit breaker
US3440379A (en) Gas-blast circuit breaker with multiple interruption
US3163737A (en) Gas blast circuit breaker and operating means therefor
US3167630A (en) Multi-break gas blast circuit breaker and operating means therefor
US3311726A (en) Puffer-type fluid-blast circuit interrupter with pressurized casing for actuating driving piston
US3286066A (en) Gas blast circuit breaker with spring mounted hollow contact member and associated exhaust valve controlled thereby
US2924690A (en) Circuit interrupters
US2412858A (en) Circuit interrupter
US2581571A (en) Circuit interrupter
US2568008A (en) High-voltage air blast circuit breaker having the blast valve arranged at line potential
US3256414A (en) Operating mechanism for electrical circuit breaker of the gas blast type
US3185802A (en) Gas blast circuit breakers having at least one tubular contact
US3334207A (en) Gas blast circuit-breaker with stationary spaced tubular contacts and piston actuated contact bridge including blast valve actuated thereby
US3538282A (en) Fluid-blast circuit interrupters with exhaust valves responsive solely to the pressure generated by an arc of excessive magnitude
US3567885A (en) Isolator switch with bridging resistance and extinguishing gas control
US3439140A (en) Pressure gas operated switch with closed gas circuit
US3246108A (en) Arc-extinguishing structure and tank housing for a compressed-gas circuit interrupter
US3597557A (en) Compressed gas actuated electrical switch with sleeve valves
US3310648A (en) Gas blast circuit breaker with nozzle formed contacts and control for associated gasoutlet valves
US3339046A (en) Blast valve arrangement for compressed gas operated circuit breakers