US3670126A - Compressed-gas circuit interrupter having a pair of rapid transfer insulating nozzles - Google Patents

Compressed-gas circuit interrupter having a pair of rapid transfer insulating nozzles Download PDF

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Publication number
US3670126A
US3670126A US838157A US3670126DA US3670126A US 3670126 A US3670126 A US 3670126A US 838157 A US838157 A US 838157A US 3670126D A US3670126D A US 3670126DA US 3670126 A US3670126 A US 3670126A
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United States
Prior art keywords
nozzle
gas
contact
interrupter
inward
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Expired - Lifetime
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US838157A
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English (en)
Inventor
Robert M Roidt
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Westinghouse Electric Corp
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Westinghouse Electric Corp
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Publication date
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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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid

Definitions

  • a gas-blast type of circuit breaker having a pair of separable contacts with a pair of contractable insulating nozzles disposed closely adjacent the point of separation of the separable contacts.
  • Berkebile illustrates such a construction.
  • highpressure gas may exist in the region between both fully open separated contacts.
  • downstream secondary blast valves may be employed to halt the exhausting of high-pressure gas flow through the separated contacts in the fully open-circuit position of the interrupter.
  • a pair of separable contacts in a highpressure gaseous atmosphere with a pair of contractable insulating spaced nozzles disposed adjacent the point of contact separation Preferably, the separable main contacts themselves provide a primary blast valve, so that upon separation of the contacts, there may occur a radial inward flow of highpressure gas into at least one of the separable contacts. Controlling the flow of exhausting gas through said one contact, or in the particular arrangement involving both separable contacts, is one or more secondary blast valves, which are disposed downstream of the gas flow.
  • a pair of contractable insulating spaced nozzles move radially inwardly upon being released by opening movement of the movable contact, and these contractable insulating nozzles serve to force the established arc axially along the center-line of the movable vented separable contacts to increase the efficiency of are ex- I tinction.
  • the mechanical arrangement is such that the downstream secondary blast valves remain open for a predetermined time to assure an interruption of the are established between the separable'contacts. At a point in time, where assurance is had that the arc has been extinguished, the mechanical arrangement is such that the secondary blast valves are closed, thereby halting any further exhausting of the high-pressure gas through the separable contacts.
  • the primary blast valve disposed immediately adjacent the point of abutment of the separable contacts, insures a sealing condition at this point, and the mechanical arrangement during such a closing operation is such as to open the one or more secondary blast valves, to thereby permit a lowering of the pressure communicating with the region interiorly of the separable contacts.
  • a general object of the present invention is to provide a high-speed compressed-gas circuit interrupter utilizing a pair of contractable nozzles for increasing the efficiency of arc extinction.
  • Another object of the present invention is the provision of improved means for axially locating the arc established in a compressed-gas circuit interrupter of the type in which a radial inward gaseous flow occurs.
  • Still a further object of the present invention is the provision of an improved compressed-gas circuit interrupter of the type utilizing a primary blast valve, one or more secondary blast valves, and a pair of contractable insulating nozzles, which are collapsed during the opening operation to assure an accurate centering of the arc axially along the center-line of the contact structure.
  • FIG. 1 is an end elevational view of a compressed-gas circuit interrupter embodying the principles of the present invention
  • FIG. 2 illustrates a vertical sectional view taken through the interrupting chamber of the circuit interrupter of FIG. 1, the contact structure being illustrated in the closed-circuit position;
  • FIG. 3 is an enlarged vertical sectional view illustrating the contact structure in the cIosed-circuit position thereof;
  • FIG. 4 is a view similar to FIG. 3, but illustrating the disposition of the several parts during the initial portion of the opening operation
  • FIG. 5 is a view similar to FIGS. 3 and 4, but illustrating the disposition of the parts at a later point in time during the opening operation;
  • FIG. 6 is a fragmentary perspective view of the contractable insulating nozzle construction
  • FIG. 7 is a view similar to that of FIG. 6, but illustrating the contractable nozzle construction in the contracted position thereof.
  • FIG. 8 is a vertical sectional view taken through one of the two contractable noule arrangements.
  • each phase unit such as phase unit A, comprising a leftwardly slanting arc-extinguishing assemblage, generally designated by the reference numeral 2, and a right-hand slanted tenninal-bushing structure, generally designated by the reference numeral 3.
  • the lower end of the arc-extinguishing assemblage 2 is electrically connected by a curved electrical conductor 4 more clearly illustrated in FIG. 2 of the drawings. Accordingly, it will be apparent that there is provided a generally U-shaped circuit-breaker structure 1 with one leg of the U constituting the arc-extinguishing assemblage 2, whereas the righthand leg of the U" constitutes generally the terminal-bushing structure 3. Lead connections L L, are attached to the upper extremities of the generally U-shaped circuit interrupter l, as indicated in FIG. 1 of the drawings.
  • the compressed gas circuit interrupter l of the present invention is generally of the dual-pressure type in which highpressure gas 5 is stored in a tank, not shown, and is disposed immediately adjacent the separable contact structure 7 in the region designated by the reference numeral 8 in FIGS. 3-5 of the drawings. Such region 8 is also illustrated in FIG. 2 of the drawings, and designated by the same reference numeral.
  • the region 9, rearwardly of both contact structures 10, 11, is at relatively low pressure.
  • These regions are designated by the reference numeral 9, and are pneumatically interconnected by at least one interconnecting conduit designated by the reference numeral 12 in FIG. 2 of the drawings.
  • the manner of operation of the circuit interrupter l is the actuation of tripping valves, generally designated by the reference numeral 14 in FIG. 2 of the drawings.
  • the actuation of such tripping valves 14 through a linkage l5, hereinafter described, causes the entrance of high-pressure gas 5 below a piston structures, one of which is provided at the upper end of each of the three arcextinguishing assemblages 2.
  • FIGS. 3-5 of the drawings it will be noted that there is a pair of separable contacts 10, 11 having a primary blast valve structure 27, and a pair of secondary blast-valve structures 23a, 23b.
  • the secondary blast-valve structures 23a, 23b are mechanically interconnected by the ladder-shaped operating linkage, and are simultaneously actuated.
  • the tripping valves 14 in the three phase units are simultaneously opened to cause the entrance of high-pressure gas upwardly through the conduits, and against the lower surfaces of the piston structures.
  • This causes upward opening movement of the piston structures and corresponding upward movement of the ladder linkage arrangements, and, in addition, causes upward movement of an operating rod 30 mechanically connected to the movable contact structure 10.
  • Reference may be directed to the operating rod 30 of FIG. 3.
  • both secondary blast valves 23a, 23b are opened, and the high-pressure gas in the region 8 flows radially inwardly, and through both separable tubular contacts 10, ll exhausting therethrough into the regions 9 downstream of the separable contacts 10, 11.
  • This exhausting flow is controlled by the secondary blast valves, 23a, 23b which areoperated in unison.
  • This closing motion of the secondary blast valves is achieved by a flange portion 10b secured to the movable contact 10, which compresses a compression spring 43 and following the overcoming of friction at the seal 44,.the secondary movable blast valve 23a is closed up against its seat 45, thereby halting the further flow of compressed gas.
  • the right-hand secondary blast valve 23b as illustrated in FIGS. 3-5 of the drawings, is mechanically connected to the ladder-shaped operating linkage, and therefore moves simultaneously with the left-hand secondary blast valve 230.
  • both the moving contact 10 and the flange portion l0b thereof, and also the operating rod 46, together with its actuator portion 46a, causes compression of the compression spring 43a and corresponding closure of the right-hand secondary blast valve 23b against its seat 45a.
  • the breaker is now in the open-circuit position with the primary blast valve opened, and both secondary blast valves 23a, 23b closed.
  • the high-pressure gas is exhausted from the lower surface of the piston structures, and the high-pressure gas which is constantly present above the piston structures causes the downward closing motion thereof. This is communicated through the ladder-shaped linkage and also through the operating rod 30 connected to the movable contact 10. As. a result, the moving contact 10 moves.
  • the two pairs of stationary contact fingers 34, 48 each of which is supported by its contact holder 340 or 48a.
  • the contact holders are, as readily apparent in FIG. 2, bolted to the plate portions 50, 51 constituting the ends of the low-pressure regions rearwardly of the stationary and movable contact structures 10, 11, reference being had to FIG. 3 in this connection.
  • the device comprises two spring-loaded sectioned contractable nozdes 70, 71, which slide into place behind separating contact cylinders to force an initially axial arc 38, and eliminate the need for flow-forced transfer.
  • a perspective view of the contractable nozzle 70 is illustrated in FIGS. 6 and 7 of the drawing, and the sequence of the interrupting procedure is illustrated in FIGS. 3-5 of the drawings.
  • the noule 70 illustrated in FIG. 7, comprises four sections, 70a, 70b, 70c, 70d but for certain types of interrupteis, perhaps three might be found preferable.
  • the nozzle sections are designed so that the moving contact cylinder 10 forces them apart during contact reclosure. The distance the nozzle sections 70, 71 move would not be very great since their primary function is simply to force the are 38 toward the centerline and prevent arcing upstream of the minimum nonle area. They also force the are 38 away from the steady state operation contact point.
  • the fundamental intention behind the present invention is the step toward obtaining the maximum possible interrupting capability for a given nozzle area and operating pressure.
  • FIG. 7 illustrates the nozzle 70 in the collapsed or retracted position
  • FIG. 6 illustrates the nozzle 70 in its expanded condition, which is the state as set forth in FIG. 30f the drawings.
  • FIG. 8 is a sectioned view taken through the nozzle 70 ofFIG. 7, taken along the line IX-IX of FIG. 7.
  • leaf springs may be provided as illustrated in FIG. 7 of the drawings.
  • the first contractable insulating nozzle structure 71 additionally delays application of the inward blast of gas upon the arc 38 during the initial establishment thereof. This is desirable because the arc 38 cannot be extinguished prior to its attaining a predetermined length as well known by those skilled in the art. Consequently, this additional action on the part of the first nozzle structure 71 minimizes the generation of arcing energy at a time when are interruption is not possible, and avoids voltage surges on the connected line.
  • the nozzle sections would preferably be made from a suitable arc-resistant dielectric material, such as polytetrofluoroethylene and sold under the tradename Teflon.
  • a relatively movable tubular venting contact cooperable with said relatively stationary venting contact to establish an arc and through which gas may also exhaust during interruption;
  • casing means for confining a high-pressure gas externally of said separable contacts
  • a first contractable insulating nozzle structure supported at the relatively stationary contact and comprising a plurality of inward-biased nozzle portions disposed interiorly of an annular nozzle holder (74): having a nozzle opens g. said first contractable insulating nozzle structure delaying application of said inward flow of gas prior to the withdrawal of said movable tubular venting contact out of said nozzle opening;
  • a second contractable insulating nozzle spaced axially along the line of contact travel from said first nozzle structure and also including a plurality of inward-biased nozzle portions;
  • said movable tubular venting contact passing interiorly through both said first and second contractable insulating nozzle structures during the closing operation of the interrupter to thereby expand the nozzle portions in both nozzle structures;

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US838157A 1969-07-01 1969-07-01 Compressed-gas circuit interrupter having a pair of rapid transfer insulating nozzles Expired - Lifetime US3670126A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US83815769A 1969-07-01 1969-07-01

Publications (1)

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US3670126A true US3670126A (en) 1972-06-13

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Application Number Title Priority Date Filing Date
US838157A Expired - Lifetime US3670126A (en) 1969-07-01 1969-07-01 Compressed-gas circuit interrupter having a pair of rapid transfer insulating nozzles

Country Status (3)

Country Link
US (1) US3670126A (enrdf_load_stackoverflow)
JP (1) JPS516865B1 (enrdf_load_stackoverflow)
CA (1) CA923532A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5514844A (en) * 1992-08-01 1996-05-07 Mitsubishi Denki Kabushiki Kaisha Switch
EP1675145A1 (de) * 2004-12-23 2006-06-28 ABB Technology AG Hochleistungsschalter mit Dichtung gegen Heissgas

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5327757U (enrdf_load_stackoverflow) * 1976-08-17 1978-03-09
JPS5499567U (enrdf_load_stackoverflow) * 1977-12-26 1979-07-13
JPS5514298U (enrdf_load_stackoverflow) * 1978-07-17 1980-01-29
JPS6055062U (ja) * 1983-09-22 1985-04-17 双葉電子工業株式会社 表示装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD36453A (enrdf_load_stackoverflow) *
CH181356A (de) * 1934-03-28 1935-12-15 Aeg Schalter mit Lichtbogenlöschung durch Druckgas.
US3297848A (en) * 1964-04-27 1967-01-10 Coq France Oil switch having anti-flash device for restricting arc type discharges upon switch openings
DE1271241B (de) * 1966-11-14 1968-06-27 Siemens Ag Druckgasschalter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD36453A (enrdf_load_stackoverflow) *
CH181356A (de) * 1934-03-28 1935-12-15 Aeg Schalter mit Lichtbogenlöschung durch Druckgas.
US3297848A (en) * 1964-04-27 1967-01-10 Coq France Oil switch having anti-flash device for restricting arc type discharges upon switch openings
DE1271241B (de) * 1966-11-14 1968-06-27 Siemens Ag Druckgasschalter

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5514844A (en) * 1992-08-01 1996-05-07 Mitsubishi Denki Kabushiki Kaisha Switch
EP1675145A1 (de) * 2004-12-23 2006-06-28 ABB Technology AG Hochleistungsschalter mit Dichtung gegen Heissgas
WO2006066429A1 (de) * 2004-12-23 2006-06-29 Abb Technology Ag Hochleistungsschalter mit dichtung gegen heissgas
US7732727B2 (en) 2004-12-23 2010-06-08 Abb Technology Ag Heavy-duty circuit-breaker with sealing against hot gas
CN101088135B (zh) * 2004-12-23 2012-04-18 Abb技术有限公司 具有针对热气的密封件的大功率开关

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Publication number Publication date
JPS516865B1 (enrdf_load_stackoverflow) 1976-03-02
CA923532A (en) 1973-03-27

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