US3702911A - Vacuum circuit breaker - Google Patents

Vacuum circuit breaker Download PDF

Info

Publication number
US3702911A
US3702911A US161772A US3702911DA US3702911A US 3702911 A US3702911 A US 3702911A US 161772 A US161772 A US 161772A US 3702911D A US3702911D A US 3702911DA US 3702911 A US3702911 A US 3702911A
Authority
US
United States
Prior art keywords
electrode
circuit breaker
vacuum circuit
outer electrode
sleeve
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
US161772A
Other languages
English (en)
Inventor
Max-Josef Schonhuber
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens Corp
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 Siemens Corp filed Critical Siemens Corp
Application granted granted Critical
Publication of US3702911A publication Critical patent/US3702911A/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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
    • 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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
    • H01H33/6646—Contacts; Arc-extinguishing means, e.g. arcing rings having non flat disc-like contact surface

Definitions

  • An additional electrode 1 e erences at the potential of the inner electrode is axially ad- UNITED STATES PATENTS jace'nt and faces the outer electrode forming a substantially annular canal between the additional and 3,185,800 5/1965 Titus ..200/ 144 B outer electrodes whigh extends radially at least in part 3,541,284 11/1970 Wachta .'...200/l44 B 3,546,406 12/ 1970 Frink ..200/ 144 B 13 Claims, 5 Drawing Figures /l/l/l/l/ld w/l/l/m PATENTEB Nov 14 I972 SHEET 1 BF 5 :Fig.1'
  • the invention relates to a vacuum circuit breaker. More particularly, the invention relates to a vacuum circuit breaker for high voltages and high power ratings.
  • An object of my invention is to provide an operationally reliable vacuum circuit breaker for high voltages and power ratings which uses simple disc contacts.
  • An object of the invention is to provide a vacuum circuit breaker having an internal structure which contributes to the achievement of lower contact bum-off,.a lower quenching current and particularly also of a higher power handling capacity as well as a higher voltage rating over the specified life.
  • An object of the invention is to provide a vacuum circuit breaker which eliminates the need for a vapor shield and its drawbacks.
  • Another object of the invention is to provide a vacuum circuit breaker which is efficient, effective and reliable in operation.
  • My invention comprises a vacuum circuit breaker with contacts, from which a switching arc passes over to an electrode system.
  • the electrode system comprises a cylindrical inner electrode and an outer electrode concentric with the inner electrode and is having a double wall. Voltage is applied to the outer sleeve of the outer electrode.
  • a housing surrounding the contacts and the electrode system comprises an insulating body and electrically conductive metal parts closing the insulating body off at its end faces.
  • one of the contacts is affixed to the inner electrode.
  • Axially adjacent the double wall electrode is an additional outer electrode which is at the potential of the inner electrode and faces the outerelectrode, forming an at least partially radially extending substantially annular canal.
  • the arc is initially made to move away fast enough from the contacts, the life of which is increased thereby, it remains captive in a space completely enclosed by electrode surfaces until it is quenched or extinguished.
  • the large electrode running area available to the arc outside the contacts immediately results in a substantial reduction of the quenching current. Due to the complete enclosure of the arc space by electrode surfaces, however, migration of the charge carriers from the electrodes or recombination of charge carriers at surfaces not serving as electrodes is especially prevented. This eliminates the need for an additional increase and collection of charge carriers via an anode spot.
  • Anode spots havea tendency to dwell for extended periods at certain points and to erode them excessively. Anode spots do not occur in the circuit breaker of the invention, and the rapid failure of circuit breakers caused thereby does not occur below a relatively high critical current.
  • the arcs are prevented from travelling any distancein the electrode system, but are efi'ectively repelled after entering into the oppositely disposed sections of the outer and additional outer electrodes.
  • the arcs may therefore be kept at a safe distance from the insulating body of the vacuum vessel,
  • a more favorable stress of the insulating body of the vacuum vessel may be provided by the two outer mutually facing electrodes, and generally smaller electrode spacings may be provided within the entire vacuum vessel, as is hereinafter described.
  • the additional outer electrode may have an outer sleeve and be continued radially inward, starting from the end facing the other outer electrode.
  • the radial configuration can be designed in different ways as hereinafter explained.
  • the inner sleeve and the outer sleeve of the first outer electrode may be separated by an insulating annular gap, and voltage may also be applied to the inner sleeve via the corresponding metal part at the end face. This leads to the formation of a loop in the current path, which propels the arc.
  • the inner electrode is designed as a hollow cylinder which surrounds the terminal stud and is connected with said stud only at the end provided with the contact. This design of the inner electrode may be provided in all the embodiments of the invention.
  • the invention permits the insuring of a favorable dielectric stress of the insulating body of the vacuum circuit breaker. This may be achieved by aligning the outer sleeve of the additional outer electrode with the outer sleeve of the first outer electrode and arranging the aligned sleeves with a gap parallel to the insulating body, the canal formed between the outer electrodes opening at about the center of the insulating body. Due to this arrangement, the electrostatic field builds up relatively uniformly over the middle part of the insulating body and his possible to stay within the stress limits of the insulating surfaces by a suitable selection of the radii of curvature. of the electrodes, while keeping the spacings within the vacuum vessel along the lines of the fringe field small. Information on the physical basis'for the arrangement of such high voltage electrodes may be found in Breakdown of Gases Below the Paschen Minimum, IEEE Paper 68 TP 647-PWR, 1968.
  • the desired direction of the switching arcs in the electrode system depends on the configuration of the current path.
  • the desired return of the arc may be improved by an insulating gap between the additional electrode and the inner electrode.
  • Different design forms are hereinafter described for the location of the insulating gap.
  • the additional electrode has a part approximately aligned with the inner electrode, and the insulating gap between the aligned parts is in the region of the end of the first outer electrode. The desired effect is achieved in the most reliable manner if, in conjunction with this position of the insulating gap a double wall first outer electrode is selected with the inner and outer sleeve separated from each other in the indicated manner.
  • the spacingsbetween electrodes be selected at different potentials about equal to, or partially smaller than, the spacing of the contacts in the open condition.
  • the vacuum may also be maintained by having at least one electrode, at least in part, comprise a getter material, without necessarily exerting an unfavorable effect on the material of the contact proper.
  • FIG. 1 is a schematic diagram, partly in section of an embodiment of the vacuum circuit breaker of the invention in which the inner cylindrical electrode is affixed to the movable contact;
  • FIG. 2 is a schematic diagram, partly in section of another embodiment of the vacuum circuit breaker of the invention in which the inner cylindrical electrode is fixed in position;
  • FIG. 3 is a schematic diagram, partly in section, of a modification of the embodiment of FIG. 2 in which there is a gap between the inner and outer sleeves of the first inner electrode;
  • FIG. 4 is a schematic diagram, partly in section, of two other embodiments of the vacuum circuit breaker of the invention, one embodiment being shown to the right of the center line and the other embodiment being shown to the left of the center line; and
  • FIG. 5 is a schematic diagram, partly in section, of still another embodiment of the vacuum circuit breaker of the invention having an additional outer electrode of especially simple structure.
  • the vacuum circuit breaker has a housing 2 comprising a pair of discshaped metal parts 3 and 4, arranged at the end faces, and an insulating body 5 in the form of a hollow cylinder, positioned between the metal parts 3 and 4 and afiixed to said metal parts.
  • the insulating body 5 may comprise glass or ceramic material and may be smooth or provided with ribs.
  • a fixed contact 6 and a movable contact 7 face each other.
  • Each contact 6 and 7 is of disc, plate or block configuration.
  • the fixed contact 6 may be affixed to the metal part 4, for example, through which the current is supplied.
  • 'A connecting stud 10 is affixed to the metal part 4 and functions as a connection to a bus bar, cable, or the like.
  • the movable contact 7 is affixed to the end face of an extended, hollow-cylindrical inner electrode 11 which is supported by an actuator rod 12.
  • the actuator rod 12 also functions as the terminal stud-when it is in the closed condition and immediately after.
  • the inner electrode 11 is connected to the actuator rod 12 only at the end at which the contact 7 is mounted.
  • the actuator rod 12 extends from the housing 2 through an opening 13 formed through metal part 3 and is movably supported in said metal part in a manner not shown in the FIGS.
  • the actuator rod 12 is connected to a suitable driving mechanism (not shown in the FIGS).
  • Bellows 14 is provided between the metal part 3 and the actuator rod 12 to seal the housing 2 with respect to the surrounding atmosphere and to permit vacuum-tight motion of said actuator rod.
  • a connecting strap 15 provides a direct electrically conductive metal connection between the actuator rod 12 and the metal part 3.
  • a first outer electrode 16 and an additional outer electrode 17 are positioned in the housing 2 axially adjacent each other and concentric to the inner electrode 11.
  • the first outer electrode 16 and the additional outer electrode 17 direct the arc ignited between the contacts 6 and 7 in a manner hereinafter described.
  • the first outer electrode 16 has a double wall which in its cross-sectional configuration is approximately a U.
  • the open end of the first outer electrode 16 faces the metal part 4.
  • the first outer electrode 16 has an inner sleeve 20 and an outer sleeve 21 which is affixed to the metal part 4 at the end face.
  • the inner sleeve 20 is shorter than the outer sleeve 21.
  • a current entering the electrode 16 therefore always flows through the sleeve 21 to the metal part 4.
  • a step 22 is provided between the sleeves 20 and 21 of the first outer electrode 16 in such a manner that there is a small space 22' between the sleeves 20 and 21 at the upper end of the first outer electrode 16 which expands to a larger space 23 between said sleeves.
  • the additional outer electrode 17 has essentially the same shape as the first outer electrode 16.
  • the additional outer'electrode 17- thus has an inner sleeve 24 which surrounds the inner electrode 11 concentrically with a substantially annular gap 28, and an outer sleeve 25.
  • a step 26 is provided between the sleeves 24 and of the electrode 17, similarly to the step 22 of the electrode 16.
  • the outer sleeve 25 of the electrode 17 is affixed to the metal part 3 at the end face of the housing 2, whereby the potential of the inner electrode 11 is applied to the additional outer electrode 17.
  • the electrodes 16 and 17 engage in labyrinth fashion in such a manner that a substantially annular canal 27 having a substantially Z-shaped cross-section is formed; the canal 27 having two radially extending sections and one axially extending section. Since the operating voltage of the vacuum circuit breaker is applied to the outer electrodes 16 and 17, the stress of the insulating body 5 is shifted to its central zone from the opening of the canal 27. A favorable distribution of the electrostatic field is provided.
  • the contacts 6 and 7 Upon switching off, the contacts 6 and 7 arrive at the positions shown in FIG. 1.
  • the are ignited between the contacts 6 and 7 travels into the substantially annular gap between the inner electrode 11 and the first outer electrode 16 through the influence of the magnetic field.
  • the are may travel in such gap upwards until it is taken over by the additional outer electrode 17, which is at the same potential as the inner electrode 11. If the arc is not yet quenched or extinguished by then, it may enter into the Z-shaped canal 27. There, however, a magnetic influence on the arc occurs in such a manner that it is repelled efiectively and immediately.
  • the are can therefore not get within view of the wall of the insulating body 5 and damage it or spray it with metal vapor. This is aided particularly by the fact that there is no visual connection to the insulating body 5 from the entrance of the Z-shaped canal 27, which is situated between the topmost point 29 of the first outer electrode 16 and the step 26 of the additional outer electrode 17.
  • the vacuum circuit breaker of the embodiment of FIG. 2 is completely similar to the breaker of the em-' bodiment of FIG. 1 with respect to its basic design and operation.
  • the bellows 14 is provided at the metal part 4 at the end face, and the contact 6 is affixed to a movably-mounted carrier 36.
  • a connecting strap 15 functions to relieve the bellows 14' from carrying current.
  • the first inner electrode 16 is provided with slots 35.
  • the inner sleeve 20 of the first outer electrode 16 is also affixed to the metal part 4 at the end face of the vacuum vessel 2, and an annular insulating gap 34 is formed in the region of the upper end 29 of said first outer electrode 16.
  • the insulating gap 34 may be located directly at the topmost point or somewhat below such point on the side facing the inner electrode 11, or on the side facing away from it.
  • the parts of the electrodes adjacent the annular insulating gap 34 may be rounded off by a bead, or an overlap can be provided in lieu of the rounding off, as indicated in the embodiment of FIG. 4.
  • This structure of the first outer electrode 16 provides the advantage that after the arc leaves the vicinity of the contacts 6 and 7 an intensive loop effect is exerted which moves the are rapidly toward the upper end 29 of said electrode. As soon as the arc passes to the additional outer electrode 17, however, and enters the canal 27, it is prevented from travelling further, by a strong loop effect, and is repelled.
  • FIG. 4 shows two modifications for the design of the outer electrodes 16 and 17 and the inner electrode 11 which permit an additional influence on the arc.
  • another additional outer electrode 18 is provided in the left part of FIG. 4, another additional outer electrode 18 is provided.
  • the other additional outer electrode 18 has an inner sleeve 24 which is modified in such a way that it protrudes radially inwardly as a linear continuation of the step 26 of the electrode 17 (FIG. 1).
  • the inner electrode 11' is shortened and also drawn inward, so that the substantially annular gap 28' remains, but in a different position. This results in a reliable engagement of the are at the entrance of the canal 27'.
  • another additional outer electrode 19 is provided.
  • the other additional outer electrode 19 has an inner sleeve 24", contrary to the embodiments of FIGS. 1 to 3, which is angled off downward from the metal part 3 on the end face, that is, in the direction of the metal part 4 on the end face.
  • the inner electrode 11" is shortened so that the end of the shortened electrode 11" and the end of the inner sleeve 24' face each other in a manner similar to the inner and outer sleeve of the electrode 16 of FIG. 3. It is recommended, however, that the gap 28" be provided between the inner electrode 11" and the outer electrode 19 at a different height than the gap 34 of FIG. 3.
  • the ends of the electrodes 11" and 18 or 19, respectively, facing each other may suitably overlap each other, as shown in FIG. 4.
  • the changed direction of the inner sleeve 24" of the outer electrode 19 in the right hand part of FIG. 4 causes an extension of the labyrinth-like overlap between the two outer electrodes 16' and 19.
  • the chance that metal vapor might get on the insulating body 5 is therefore particularly small. This is aided by the fact that the different position of the gap 28 between the electrodes 11'. and 19 repels the arc after the arc enters the labyrinth-like overlap of the outer electrodes 16' and 19, even earlier than in the aforedescribed embodiments.
  • the double wall first outer electrode 16 has slots 35 formed therein at inclinations to the axis.
  • the slots 35 are formed in the outer sleeve 21 (FIG. 2).
  • the design of the electrodes 11', 11", 18 and 19 may be utilized, regardless of whether the first outer electrode 16 is divided and has a gap 34 at its topmost point (FIG. 4).
  • FIG. 5 illustrates another embodiment of the invention having a particularly simple design of the double wall first outer electrode 40 and the additional outer electrode 39.
  • the additional outer electrode 39 starting at its outer sleeve 25 extends radially inward at a right angle and then again at a right angle axially toward the metal part 4 on the end face.
  • the double wall first outer electrode 40 is of simpler structure than in the aforedescribed embodiments.
  • the first outer electrode 40 is of U-shaped cross-section, except for the substantially annular gap 34 in the same position as in the embodiment of FIG. 4.
  • the inner sleeve 41 and the outer sleeve 42 of the first outer electrode 40 are hollow cylinders positioned concentrically around the actuator rod 12 and connected by a radially extending part 43.
  • the inner electrode 11" has the shortened configuration illustrated in the right hand part of FIG. 4 with a constriction at its upper end thereby forming a substantially annular gap 28" with the additional outer electrode 39.
  • the canal 44 between the electrodes 39 and 40 is of simple angular configuration. There is no visual connection between the entrance of the canal 44, which is at the mutually staggered substantially annular gaps 28" and 34, and the opening at the insulating body 5, as in the aforedescribed embodiments. This is essential for the protection of the insulating body 5 from spraying with metal vapor.
  • a vacuum circuit breaker having a housing comprising an insulating body of substantially hollow cylindrical configuration and a pair of electrically conductive metal parts closing the insulating body at the end faces thereof, first and second contacts and an electrode system in the housing in which a switching arc passes from the contacts to the electrode system, the electrode system comprising an inner electrode of substantially hollow cylindrical configuration and a first outer electrode of substantially hollow cylindrical configuration having a double wall with an inner sleeve and an outer sleeve concentrically positioned around the inner electrode, means for applying a voltage to the outer sleeve of the first outer electrode, the vacuum circuit breaker comprising an additional outer electrode at the potential of the inner electrode axially adjacent the first outer electrode and forming therewith a substantially annular canal extending radially at least in part, one of said contacts being affixed to the inner electrode.
  • a vacuum circuit breaker as claimed in claim 1

Landscapes

  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
US161772A 1970-07-16 1971-07-12 Vacuum circuit breaker Expired - Lifetime US3702911A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2036099A DE2036099C3 (de) 1970-07-16 1970-07-16 Vakuumleistungsschalter

Publications (1)

Publication Number Publication Date
US3702911A true US3702911A (en) 1972-11-14

Family

ID=5777404

Family Applications (1)

Application Number Title Priority Date Filing Date
US161772A Expired - Lifetime US3702911A (en) 1970-07-16 1971-07-12 Vacuum circuit breaker

Country Status (4)

Country Link
US (1) US3702911A (enrdf_load_stackoverflow)
CH (1) CH523591A (enrdf_load_stackoverflow)
DE (1) DE2036099C3 (enrdf_load_stackoverflow)
GB (1) GB1296337A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3786214A (en) * 1973-01-19 1974-01-15 Gen Electric Interleaving-rod type vacuum interrupter having two breaks in series between each pair of rods
US3870845A (en) * 1972-10-27 1975-03-11 Hazemeijer Bv Vacuum circuit interrupter with a plurality of interrupting units
US3889079A (en) * 1973-09-14 1975-06-10 Westinghouse Electric Corp Vacuum-type circuit interrupters having an axial magnetic field produced by condensing shield coils
US3953693A (en) * 1974-09-09 1976-04-27 Allis-Chalmers Corporation Vacuum switch with integrated capacitor shield
US5597992A (en) * 1994-12-09 1997-01-28 Cooper Industries, Inc. Current interchange for vacuum capacitor switch
CN102856114A (zh) * 2011-06-29 2013-01-02 Abb技术有限公司 用于高额定电流的双电流路径
US20140224769A1 (en) * 2011-06-07 2014-08-14 Alstom Technology Ltd. Power Switching Apparatus

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4818530B2 (ja) † 2001-04-19 2011-11-16 三菱電機株式会社 真空バルブ
RU2009106744A (ru) * 2009-02-27 2010-09-10 Общество с ограниченной ответственностью "Промышленная Группа ТЭЛ Таврида Электрик" (RU) Устройство для сопряжения подвижного токосъема вакуумной дугогасительной камеры с терминалом коммутационного аппарата
CN115441548A (zh) * 2022-09-19 2022-12-06 Oppo广东移动通信有限公司 充电接口、电源适配器、电子设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3185800A (en) * 1963-02-18 1965-05-25 Gen Electric Vacuum type circuit interrupter with improved vapor-condensing shielding
US3541284A (en) * 1967-12-14 1970-11-17 Allis Chalmers Mfg Co Combined vacuum circuit interrupter and impedance means
US3546406A (en) * 1966-11-21 1970-12-08 Westinghouse Electric Corp Vacuum-type circuit interrupter with hollow contacts
US3632928A (en) * 1969-03-20 1972-01-04 Westinghouse Electric Corp Contact structures for vacuum-type circuit interrupters

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3185800A (en) * 1963-02-18 1965-05-25 Gen Electric Vacuum type circuit interrupter with improved vapor-condensing shielding
US3546406A (en) * 1966-11-21 1970-12-08 Westinghouse Electric Corp Vacuum-type circuit interrupter with hollow contacts
US3541284A (en) * 1967-12-14 1970-11-17 Allis Chalmers Mfg Co Combined vacuum circuit interrupter and impedance means
US3632928A (en) * 1969-03-20 1972-01-04 Westinghouse Electric Corp Contact structures for vacuum-type circuit interrupters

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3870845A (en) * 1972-10-27 1975-03-11 Hazemeijer Bv Vacuum circuit interrupter with a plurality of interrupting units
US3786214A (en) * 1973-01-19 1974-01-15 Gen Electric Interleaving-rod type vacuum interrupter having two breaks in series between each pair of rods
US3889079A (en) * 1973-09-14 1975-06-10 Westinghouse Electric Corp Vacuum-type circuit interrupters having an axial magnetic field produced by condensing shield coils
US3953693A (en) * 1974-09-09 1976-04-27 Allis-Chalmers Corporation Vacuum switch with integrated capacitor shield
US5597992A (en) * 1994-12-09 1997-01-28 Cooper Industries, Inc. Current interchange for vacuum capacitor switch
US20140224769A1 (en) * 2011-06-07 2014-08-14 Alstom Technology Ltd. Power Switching Apparatus
US9418806B2 (en) * 2011-06-07 2016-08-16 Alstom Technology Ltd. Power switching apparatus
CN102856114A (zh) * 2011-06-29 2013-01-02 Abb技术有限公司 用于高额定电流的双电流路径
US20140110235A1 (en) * 2011-06-29 2014-04-24 Ulf Akesson Dual Current Path For High Rated Currents
US8895883B2 (en) * 2011-06-29 2014-11-25 Abb Technology Ag Dual current path for high rated currents
KR101484897B1 (ko) 2011-06-29 2015-01-20 에이비비 테크놀로지 아게 고정격 전류들에 대한 이중 전류 경로
CN102856114B (zh) * 2011-06-29 2016-10-05 Abb技术有限公司 用于高额定电流的双电流路径

Also Published As

Publication number Publication date
GB1296337A (enrdf_load_stackoverflow) 1972-11-15
CH523591A (de) 1972-05-31
DE2036099B2 (de) 1974-01-17
DE2036099A1 (de) 1972-01-20
DE2036099C3 (de) 1974-08-08

Similar Documents

Publication Publication Date Title
KR0129003B1 (ko) 회전 아아크 및 팽창 회로 차단기
US4500762A (en) Resistor-type disconnecting switch for circuit breaker
US3185800A (en) Vacuum type circuit interrupter with improved vapor-condensing shielding
US3702911A (en) Vacuum circuit breaker
EP0475268B1 (en) Gas circuit breaker
RU2309478C2 (ru) Размыкающий блок высоковольтного силового выключателя
JPS58145035A (ja) 真空ア−ク放電装置
US3185797A (en) Vacuum-type circuit interrupter with improved arc splitting means
US3889080A (en) Vacuum interrupter shield protector
US4267415A (en) Current limiter vacuum envelope
US11756756B2 (en) Vacuum interrupter with double live shield
US3746811A (en) Vacuum circuit breaker
US4006331A (en) Vacuum interrupter for high voltage applications
US4020304A (en) Two-material vapor shield for vacuum-type circuit interrupter
US3845262A (en) Contact structures for vacuum-type circuit interrupters having cantilevered-supported annularly-shaped outer arc-running contact surfaces
US3766345A (en) Vacuum interrupter
US3148260A (en) Disconnecting switch having surge suppressing impedance
US4151391A (en) Contact arrangement for a pressurized gas circuit breaker
EP0200465A2 (en) Vacuum devices
US1933859A (en) Electric current rectifier control
US3480750A (en) Multiple-break enclosed-type circuit interrupters with external rotary contact driving means and single chamber construction
CA1073015A (en) Vacuum-type circuit interrupter with improved protection for bellows
US4748303A (en) Isolating switch of a high voltage metalclad installation
US3818166A (en) Contacts for vacuum interrupter of small outside diameter
US3614536A (en) Spark gap with magnetic blowing of the arc