US3004117A - Air-break disconnecting switches - Google Patents

Air-break disconnecting switches Download PDF

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Publication number
US3004117A
US3004117A US732078A US73207858A US3004117A US 3004117 A US3004117 A US 3004117A US 732078 A US732078 A US 732078A US 73207858 A US73207858 A US 73207858A US 3004117 A US3004117 A US 3004117A
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United States
Prior art keywords
impedance
switch
assemblage
arcing
contact
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Expired - Lifetime
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US732078A
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English (en)
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John W Skooglund
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CBS Corp
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Westinghouse Electric Corp
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Priority to CA681717A priority Critical patent/CA681717A/en
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US732078A priority patent/US3004117A/en
Priority to DEW25447A priority patent/DE1108777B/de
Priority to JP1371259A priority patent/JPS3516273B1/ja
Application granted granted Critical
Publication of US3004117A publication Critical patent/US3004117A/en
Anticipated expiration legal-status Critical
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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
    • H01H33/16—Impedances connected with contacts
    • H01H33/164—Impedances connected with contacts the impedance being inserted in the circuit by blowing the arc onto an auxiliary electrode
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
    • H01H31/26—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch
    • H01H31/28—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch with angularly-movable contact
    • H01H2031/286—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch with angularly-movable contact wherein the contact is rotatable around its own longitudinal axis

Definitions

  • This invention relates, in general, to air break disconnecting switches having associated therewith a series impedance assembly inserted into circuit during the opening operation, and, more particularly, to such air-break disconnecting switches of the foregoing type having improved constructional features to minimize, or prevent, high transient overvoltages on the connected lines during switching operations.
  • a general object of the present invention is to provide an improved air-break disconnecting switch having a series impedance inserted into series circuit during the opening operation, in which improved arcing contact structures are provided to facilitate arc transfer, to grade the voltage axially along the impedance assembly, and to prevent corona formation during high-voltage operation of the switch.
  • Particular advantage is obtained by the use of series resistor sections incrementally inserted into series circuit during the opening operation of the switch, but by-passed in the closed-circuit position of the switch.
  • Another object of the present invention is to provide an improved switching arrangement for an air-break dis connecting switch.
  • a further object of the invention is to provide an improved series resistor assembly, which may be adapted to airbreak disconnecting switches extending over a wide voltage range.
  • Yet a further object of the present invention is to provide an improved air-break disconnecting switch in which a series resistor assembly is associated therewith in such a manner that cantilever stresses and cable whipping will not cause misalignment of the contact structure.
  • Another object of the present invention is to provide an improved resistor assemblage for a resistor-equipped, air-break disconnecting switch in which the resistor elements are located within a hollow casing filled with a high-dielectric-strength gas to prevent voltage breakdown.
  • Still a further object of the invention is to provide improved arcing contacts serving as corona shields along the resistance assemblage. of a resistor-equipped, air-break disconnecting switch.
  • FIGURE 1 is a perspective view of an air-break disconnecting switch equipped with a seriesresistor assembly in accordance with the principles of the present invention, and the movable switch blade being illustrated in the open-circuit position;
  • FIG. 2 is a side elevational view of the resistorequipped, air-break disconnecting switch of FIG. 1, the contact structure being illustrated in the closed-circuit position;
  • FIG. 3 is a fragmentary sectional view taken along the line IIIIII of FIG. 2;
  • FIG. 4 is a fragmentary plan view taken along the line IVIV of FIG. 2;
  • *IG. 5 illustrates a modification of the invention involving the incorporation of a series-resistor assembly to a switch of relatively low-voltage rating
  • FIG. 6 is a fragmentary side elevational view of a modified type of air-break disconnecting switch'incorporating principles of the present invention, the switch being of a lower voltage rating than the disconnecting switch of FIG. 1;
  • FIG. 7 is an enlarged, fragmentary view of one of the resistor sections illustrating the weather-proof casing therefor, and some of the internal constructional features thereof;
  • FIG. 8 is a fragmentary, side elevational view of a resistor-block stack, constituting a resistor section, which is inserted into the hollow casing of the resistor section of FIG. 7, and illustrating certain constructional features;
  • FIG. 8A is a plan view of a V-shaped metallic spacing element employed in the resistor stack of FIG. 8;
  • FIG. 8B is a plan view of another metallic spacing element used in the resistor stack of FIG. 8.
  • FIG. 9 somewhat diagrammatically illustrates a modification of the present invention utilizing a high-dielectricstrength gas interiorly of the resistor sections.
  • Air-break switches are designed simply to isolate other equipment for maintenance purposes or to sectionalize power systems, and generally speaking these switching operations are performed with the system deenergized.
  • the reference numeral 1 generally desig' nates an air-break disconnecting switch suitable for the sectionalizing of relatively high-voltage circuits, and in eluding a base 2, insulating columns 3, 4, 5 and 6 supporting the contact elements of the disconnecting switch.
  • insulating columns 3 and 4 carry a mechanism housing member 7, having disposed therewithin a cam operating mechanism suitable for effecting the opening and closing, swinging motion of a movable disconnecting blade 8.
  • the actuating. mechanism disposed interiorly within the housing 7 may be of any suitable type, and constitutes no part of the present invention.
  • One such type, which may be used, is that set out in United States Patent 2,436,296, issued February 17, 1948, to Howard W. Graybill and Paul Olsson and assigned to the assignee of the instant application.
  • the actuation of such mechanism may be effected by the rotation of the insulator column 4.
  • the actuation of this mechanism will be effective to cause clockwise, swinging motion of the switch blade 8 from its fully opencircuit position, shown in FIG. 1, down into engagement with a stationary jaw contact 10, more clearly shown in FIG. 2 of the drawings. Subsequently, the blade 3 is rotated axially into firm contacting engagement.
  • FIG. 2 illustrates a side elevational view taken on the opposite side of the switch shown in FIG. 1.
  • the stationary jaw contacts 10 are supported at the upper end of the insulator column 5. Electrostatic side shielding or corona rings 11, constituting a break-jaw corona shield, are disposed on opposite sides of the stationary contact 10, as more clearly shown in FIG. 3 of the drawings. Electrically connected to the stationary jaw contact 10, by braided conductors 12, is an upstanding, sectional impedance or resistor assembly, generally designated by the reference numeral 13, and having a configuration more clearly shown in FIGS. 1 and 2.
  • the sectional, impedance assembly 13 may be composed of three resistance sections A, B and C. Additional impedance sections, if desired, may be superimposed upon those illustrated, as will be obvious to those skilled in the art.
  • Each resistor section 14 generally comprises a weatherproofhollow casing 15 (FIG. 7), interiorly of which is stationarily positioned a carbon-block resistance stack, generally designated by the reference numeral 16, and more clearly illustrated in FIG. 8 of the drawings.
  • the hollow casing 15 which preferably is made of porcelain, having skirts 15a for a long creepage path, provides an internal hollow space 17, within which is positioned the carbon-block resistance stack 16 of FIG. 8.
  • a supporting flange means including a cap casting 19 is cemented to the upper end of hollow porcelain casing 15, and a lower base casting 20 is likewise cemented and secured to the lower end of porcelain casing 15.
  • the carbon-block resistance stack 16 of FIG. 8 which comprises a plurality of carbon blocks 21 spaced apart by diaphragm-shaped metallic stop assemblies 2 2.
  • metallic V shaped spacers 23 are employed, cut the proper vertical lengths from conducting sheet metal, to space the resistor blocks 21 the proper distance apart.
  • FIG. 8A shows a plan view of such a spacing element 23.
  • FIG. 8B shows a plan view of top metallic sleeve-like spacing element 24.
  • twelve such resistor blocks 21 may be provided along a singleresistor stack 16.
  • the carbon blocks 21 have the characteristic of dissipating considenable heat, and can withstand thermal shock. In addition, they have the characteristic of being linear in their response to voltage.
  • the diameter or lateral dimension of the movable corona ball 31 attached to and movable with the free end of the swinging movable switch blade 8 is less than the vertical spacing between the stub electrode 28 and the lower lower arcing ring 36, or between the two arcing rings 36 at the upper end of the resistor assembly 13.
  • the insulator column 4- is rotated. This actuates the mechanism, disposed within mechanism housing 7, to first effect axial icefreeing and contact-pressure-redueing rotation of switch blade 8 and subsequently upward, arcuate movement of the end 31 of movable disconnecting switch blade 8 along an arc of travel indicated by the reference numeral 32 in FIG. 2 of the drawings.
  • Thesame process is repeated as the blade 8 swings toward the top of the resistor assembly 13.
  • the entire resistance is inserted into the arc path.
  • the resistance is inserted incrementally into circuit, and the arc length minimized untilthe entire resistance is in the circuit.
  • the sequence reverses during the closing operation, and when the switch is completely closed the resistance assembly is bypassed.
  • the resistor assembly 13 consists of carbon-block resistors 21 mounted within "a sealed porcelain weather casing 15. Each unit assembly 14 is designed for stacking one on the other. In order to coordinate the resistors with the disconnect switch, as described previously, an arcing contact connected electrically to the resistor elements is mounted at each flange of the stacked assembly. In the higher voltage ratings, such as the 345 kv. switch illustrated in FIGS; 1 and 2, the arcing contacts 28, 36 also serve as corona shields. The arcing contacts 36 are adjustable so that they may be coordinated with the path of travel 32 of the main switch blade.
  • the resistor assembly 13 is designed to have adequate thermal capacity to withstand repeated switch'operation without damage, it being noted that the carbon-block resistor or impedance elements 21 carry current only during the opening and closing operations of the switch 1.
  • FIG. illustrates a modified resistance assemblage involving only two resistance sections X and Y having wire or rod-shaped arcing electrodes 33 and 34.
  • the resistance assembly 37 may be mounted upon the same insulator stack 9 as supports the jaw contact 38.
  • the movable disconnect blade 39 is of slightly modified construction, from that illustrated in FIG. 2, having a hookshaped wire 'or rod end 41). Again it will be noted that the lateral dimension of the hook-shaped rod end 40 of the switch blade 39 is less than the vertical spacing between the electrodes 33, 34.
  • the arcuate paths of travel for the 115 kv. switch blade 39 and for the 161 kv. switch blade 39 are respectively indicated by the dotted lines 42, 43. I
  • FIG. 6 illustrates a modified type of switch, somewhat similar to that of FIG. 5, but incorporating modified arcing electrodes 45, 46.
  • the rod-shaped arcing electrodes 45, 46 extend laterally from a junction cast-ing 18 and a top cover casting 24 respectively. Again the lateral dimension of the hook-shaped rod end 40 is less than the vertical spacing between the electrodes 45, 46.
  • the modified resistance assemblage 47 is, inthis particular instance, adapted for support upon a separate insulator stack 48. Paths of Switchblade travel for 196 kv. and 230 kv. are respectively indicated by the dotted lines 49, 50.
  • FIG. 9 illustrates a modified type of construction in which the resistor sections, generally designated by the reference numeral 51, are disposed within modified hollow gas-tight weatherproof casings 52 containing a highdielectric-strength gas, such as sulfur hex-afluoride (SF).
  • a highdielectric-strength gas such as sulfur hex-afluoride (SF)
  • SF sulfur hex-afluoride
  • the invention contemplates the use of sulfur hexafluoride (SP gas, or other suitable high dielectric strength gas, as a high-dielectric-strength gas to enable the resistor sections, 51, disposed within the hollow casings 52; to withstand very high voltage. Also, since the hollow porcelain casings 52 of FIG. 9 are subjected to voltage for only a short period of time, they may have a very simple physical structure. Service contamination is no problem.
  • the resistor assembly is bypassed, and no load current flows through its circuit.
  • the arc transfers to the arcing contacts associated with the resistor assembly and incrementally inserts resistor sections serially into circuit, which consequentlyreduces the magnitude of the transient over-voltage.
  • the grading rings on the resistor assembly serve a dual function. First, they serve the function of arcing contacts as the arc is transferred from the stationary disconnecting contact up the resistor assembly to the uppermost arcing contact.
  • the grading rings distribute the voltage across the resistor assembly and prevent arcing to the resistor assembly porcelain or center connection. All fittings on the resistor assembly should preferably have smooth edges, and the grading rings are preferably used to reduce voltage stress and minimize formation of corona.
  • an improved air-break disconnect ing switch having a series resistance assemblage in which the arcing electrodes 28, 36 are spaced away from the path of travel of the tip 31 of the movable switch blade 8. This separation distance insures that any formation of ice will not interfere with proper switch operation. In addition, any lateral movement of the resistance column 13 will not cause misalignment of the contacts, which might occur if there were an actual physical or sliding contact between the tip 31 of the switch blade 18 and the arcing electrodes. 21, 36. Moreover, it will be apparent that the corona rings 29, 36 assist in grading the voltage lengthwise along the impedance assemblage 13, thereby compelling each resistance section 14 to assume its fair share of the total voltage. Additionally, the employment of the arcing rings 29, 36 prevents corona formation at the interiorly disposed, relatively sharp, contacting parts of the cap castings 19.
  • Th particular numerical value of the resistance in ohms employed in the resistance assemblage 13 depends upon Its electrical dimensioning is set out in detail, and claimed in the aforesaid patent application of Samuel B. Griscom. Generally, the resistance value is preferably several times the surge impedance of the circuit connected to the disconnecting switch.
  • the present invention provides a solution to the problem of high-voltage, air-break disconnecting switches being employed to switch long lengths of bus and yet avoiding the formation of higs: transient over-voltages.
  • the prior art disconnecting switches operating in air, caused a large number of restrikes to occur before the arc was finally extinguished.
  • the restrikes and the accompanying overvoltages of course, imposed severe operating duty upon the connected lightning arresters, transformers and circuit breakers.
  • the particularly severe duty imposedupon such lightning arresters can be avoided.
  • the resistors By housing the resistors within hollow porcelain structures, they are physically supported and also electrically insulated. Thus there is no icing problem and contamination presents no difiiculty.
  • An air-break disconnecting switch including means defining a relatively stationary contact, a swinging movable switch blade engageable with the relatively stationary contact to complete the electrical circuit through the switch, the swinging movable switch blade separating from the relatively stationary contact during the opening operation of the switch and traversing an arcuate path of travel, an impedance assemblage disposed adjacent the relatively stationary contact and extending generally therefrom in the direction of said path of travel, said impedance assemblage including one or more impedance sections, an arcing contact at one end of at least one impedance section to which the are upon opening switch movement may terminate yet spaced from 'said arcuate path of travel, and said arcing contact including a substantially oval-shaped arcing ring disposed in a plane substantially normal to the axial length of the impedance assemblage.
  • An air-break disconnecting switch including means defining a relatively stationary contact, a swinging movable switch blade engageable with the relatively stationary contact to complete the electrical circuit through the switch, the swinging movable switch blade separating from the relatively stationary contact during the opening operation of the switch and traversing an arcuate path of travel, an impedance assemblage disposed adjacent the relatively stationary contact and extending generally therefrom in the direction of said path of travel, said impedance assemblage including one or more impedance sections, an arcing contact at one end of at least one impedance section to which the are upon opening switch movement may terminate yet spaced from said arcuate path of travel, said arcing contact including a substantially oval-shaped arcing ring disposed in a plane sub stantially normal to the' axial length of the impedance assemblage, and adjusting means for adjustably moving said arcing ring laterally with respect to the impedance assemblage to vary its spacing from said path of travel.
  • An air-break disconnecting switch including means defining a relatively stationary contact, a swinging movable switch blade engageable with the relatively stationary contact to complete the electrical circuit through the switch, the swinging movable switch blade separating from the relatively stationary contact during the opening operation of the switch and traversing an arcuate path of travel, an impedance assemblage disposed adjacent the relatively stationary contact and extending generally therefrom in the direction of said path of travel, said impedance assemblage including one or more impedance sections, conducting structure at one end orf at least one impedance section, a surrounding generally ring-shaped arcing contact connected to said conducting structure and electrostatically shielding said conducting structure to prevent corona formation at the latter, said generally ring-shaped arcing contact being spaced from said arcuate path of travel, and said generally ringshaped arcing contact being disposed in a plane which is generally normally of said impedance assemblage.
  • An air-break disconnecting switch including means defining a relatively stationary contact, a swinging movable switch blade engageable with the relatively stationary contact to complete the electrical circuit through the switch, the swinging movable switch blade separating from the relatively stationary contact during the opening operation of the switch and traversing an arcuate path of travel, means effecting an axial contact-pressure-reducing rotation of the switch blade during the initial portion of the opening operation, an impedance assemblage disposed adjacent the relatively stationary contact and extending generally therefrom in the direction of said path of travel, said impedance assemblage including one or more impedance sections, one or more insulating hollow weatherproof casings, a stack of impedance elements disposed interiorly within at least one hollow weatherproof casing, a high-dielectric-strength gas disposed within said one hollow weatherproof casing to prevent voltage breakdown axially of said stack of impedance elements, a plurality of arcing contacts tapped into said impedance assemblage to insert impedance serially into circuit dur-- ing the opening operation, the
  • An air-break disconnecting switch including means defining a relatively stationary contact, a swinging movable switch blade engageable with the relatively stationary contact to complete the electrical circuit through the switch, the swinging movable switch blade separating from the relatively stationary contact during the opening operation of the switch and traversing anarcuate path of travel, means effecting an axial contact-pressurereducing rotation of the switch blade during the initial portion of the opening operation, an impedance assemblage disposed adjacent the relatively stationary contact and extending generally therefrom in the direction of said path of travel, said impedance assemblage including a plurality of resistor stacks enclosed interiorly within hollow insulating casings, a plurality of rod-shaped arcing electrodes tapped into said resistor stacks and extending laterally from the impedance assemblage adjacent said arcuate path of travel yet spaced from said arcuate path of travel, the lateral dimension of the free end of the movable switch blade being less than the longitudinal spacing between the rod-shaped arcing electrodes, and the capacitance between the arcing electrodes assisting
  • An air-break disconnecting switch including a relatively stationary contact, insulating means for mounting a swinging movable disconnecting switch blade, the swinging movable disconnecting switch blade being cooperable with the relatively stationary contact to establish an are, means mounting an impedance assemblage adjacent the relatively stationary contact, said impedance assemblage including at least one umbrella-shaped shielding ring at one end of the assemblage, the umbrella-shaped shielding ring being spaced from the opening path of travel of the movable disconnecting switch blade, said extending toward each other and disposed at opposite ends of the impedance assemblage, said pair of umbrella-shaped shielding rings being spaced from the opening path of travel of the swinging movable disconnecting switch blade, said impedance assemblage including one or more impedance elements,-at'1east one umbrellashaped shielding ring electrically connected to one impedance element, and the one or more impedance elements being inserted serially into circuit during the opening operation.
  • An air-break disconnecting switch including means defining a relatively stationary contact, a swinging movable switch blade engageable with the relatively stationary contact to complete the electrical circuit through the switch, the swinging movable switch blade separating from the relatively stationary contact during the opening operation of the switch and traversing an arcuate path of travel, means for causing an axial, ice-freeing and contact-pressure-reducing rotation of the switch blade during the initial portion of the opening operation, an impedance assemblage disposed adjacent the relatively stationary contact and extending generally therefrom in the direction of said path of travel, said impedance assemblage including a plurality of impedance sections, insulating weatherproof casing means surrounding and enclosing said impedance sections, a plurality of spaced arcing contacts connected to said impedance sections, a gap separation distance between said arcing contacts and the arcuate opening path of travel of the switch blade, the lateral dimension of the free end of the movable switch blade being less than the longitudinal spacing between said spaced arcing contacts, and the capacitance between
  • An air-break disconnecting switch for high-voltage service including a pair of spaced insulator columns, a relatively stationary disconnecting contact supponted at theend of one of said pair of insulator columns, a movable disconnecting switchblade supported on the end of the other insulator column and adapted for swinging engagement and disengagement with said relatively stationary disconnecting contact to close and open the connected circuit, a pair of spaced side ring-shaped corona shields disposed on opposite sides of said relatively stationary disconnecting contact toprevent the formation of corona at said relatively stationary disconnecting contact, an impedance assemblage disposed adjacent the relatively stationary disconnecting contact and extending away therefrom generally in the direction of the path or arcuate travel of the outer free end of the swinging disconnecting switch blade, said impedance assemblage including a plurality of impedance sections, each impedance section including a hollow weatherproof casing having supporting flange means at the opposite ends thereof, a plurality of arcing electrodes associated with said supporting flange means including a s
  • An air-break disconnecting switch for high-voltage service including apair of spaced insulator columns, a relatively stationary disconnecting contact supported at the end of one of said pair of insulator columns, a movable disconnecting switch blade supported on the end of the other insulator column and adapted for swinging engagement and disengagement with said relatively stationary disconnecting contact to close and open the connected circuit, a pair of spaced side ring shaped corona shields disposed on opposite sides of said relatively stationary disconnecting contact to prevent the formation of corona at said relatively stationary disconnecting contact, an impedance assemblage disposed adjacent the relatively stationary disconnecting contact and extending away therefrom generally in the direction of the path of arcuate travel of the outer free end of the swinging disconnecting switch blade, said impedance assemblage including a plurality of impedance sections, each impedance section including a hollow weatherproof casing having supporting flange means at the opposite ends thereof, a plurality arcing electrodes associated with said supporting flange means including a stub electrode disposed relatively closely to
  • An air-break disconnecting switch including means defining a relatively stationary contact, a swinging movable switch blade engageable with the relatively stationary contact to complete the electrical circuit through the switch, the swinging movable switch blade separating from the relatively stationary contact during the opening operation of the switch and traversing an arcuate path of travel, an impedance assemblage disposed adjacent the relatively stationary contact and extending generally therefrom in the direction of said path of travel, said impedance assemblage including a pair of impedance sections, a pair of spaced arcing contacts at the ends of said pair of impedance sections to which the are upon opening switch movement may terminate yet spaced from said arcuate path of travel, said paid of spaced arcing contacts including a pair of spaced oval-shaped arcing rings disposed in planes substantially normal to the axial length of the impedance assemblage, and said pair of spaced oval-shaped arcing rings being employed to successively assume arcing from the end of the switch blade and to control voltage gradation axially along the impedance assemblage.
  • An air-break disconnecting switch including means defining a relatively stationary contact, a swinging movable switch blade engageable with the relatively stationary contact to complete the electrical circuit through the switch, a corona ball disposed at the outer end of the swinging switch blade, the swinging movable switch blade separating from the relatively stationary contact during the opening operation of the switch and traversing an arcuate path of travel, an impedance assemblage disposed adjacent the relatively stationary contact and extending generally therefrom in the direction of said path of travel, said impedance assemblage including one or more impedance sections, an arcing contact at one end of at least one impedance section to which the are upon opening switch movement may terminate yet spaced from said arcuate path of travel, and said arcing contact including a substantially oval-shaped arcing ring disposed in a plane substantially normal to the axial length of the impedance assemblage.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
US732078A 1958-04-30 1958-04-30 Air-break disconnecting switches Expired - Lifetime US3004117A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA681717A CA681717A (en) 1958-04-30 Air-break disconnecting switches
US732078A US3004117A (en) 1958-04-30 1958-04-30 Air-break disconnecting switches
DEW25447A DE1108777B (de) 1958-04-30 1959-04-22 Lufttrennschalter
JP1371259A JPS3516273B1 (US20020095090A1-20020718-M00002.png) 1958-04-30 1959-04-30

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Application Number Priority Date Filing Date Title
CA681717T
US732078A US3004117A (en) 1958-04-30 1958-04-30 Air-break disconnecting switches
JP1371259A JPS3516273B1 (US20020095090A1-20020718-M00002.png) 1958-04-30 1959-04-30

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JP (1) JPS3516273B1 (US20020095090A1-20020718-M00002.png)
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DE (1) DE1108777B (US20020095090A1-20020718-M00002.png)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3148260A (en) * 1962-04-06 1964-09-08 Westinghouse Electric Corp Disconnecting switch having surge suppressing impedance
US3348002A (en) * 1965-09-24 1967-10-17 Westinghouse Electric Corp Electric switch
US20120002339A1 (en) * 2010-07-01 2012-01-05 Chao Zhang Grading Devices For A High Voltage Apparatus
US11682918B2 (en) 2006-12-06 2023-06-20 Solaredge Technologies Ltd. Battery power delivery module

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1563833A (en) * 1919-12-05 1925-12-01 Electrical Engineer S Equipmen High-tension air-break switch
US1861129A (en) * 1929-08-26 1932-05-31 Milliken Humphreys Circuit breaker
US2586290A (en) * 1947-11-01 1952-02-19 Westinghouse Electric Corp Circuit interrupter
US2830145A (en) * 1955-02-11 1958-04-08 Porter Co H K Isolator switch

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE556469C (de) * 1932-08-10 Voigt & Haeffner Akt Ges Widerstandsstufenschalter grosser Schaltleistung
DE551590C (de) * 1929-10-24 1932-06-02 Humphreys Milliken Schalter fuer Hochspannungsstroeme grosser Staerke

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1563833A (en) * 1919-12-05 1925-12-01 Electrical Engineer S Equipmen High-tension air-break switch
US1861129A (en) * 1929-08-26 1932-05-31 Milliken Humphreys Circuit breaker
US2586290A (en) * 1947-11-01 1952-02-19 Westinghouse Electric Corp Circuit interrupter
US2830145A (en) * 1955-02-11 1958-04-08 Porter Co H K Isolator switch

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3148260A (en) * 1962-04-06 1964-09-08 Westinghouse Electric Corp Disconnecting switch having surge suppressing impedance
US3348002A (en) * 1965-09-24 1967-10-17 Westinghouse Electric Corp Electric switch
US11682918B2 (en) 2006-12-06 2023-06-20 Solaredge Technologies Ltd. Battery power delivery module
US20120002339A1 (en) * 2010-07-01 2012-01-05 Chao Zhang Grading Devices For A High Voltage Apparatus
US8331074B2 (en) * 2010-07-01 2012-12-11 Cooper Technologies Company Grading devices for a high voltage apparatus

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JPS3516273B1 (US20020095090A1-20020718-M00002.png) 1960-10-27
DE1108777B (de) 1961-06-15
CA681717A (en) 1964-03-10

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