US3576414A - High voltage switch with preinsertion resistor - Google Patents

High voltage switch with preinsertion resistor Download PDF

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Publication number
US3576414A
US3576414A US768825A US3576414DA US3576414A US 3576414 A US3576414 A US 3576414A US 768825 A US768825 A US 768825A US 3576414D A US3576414D A US 3576414DA US 3576414 A US3576414 A US 3576414A
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United States
Prior art keywords
switch
resistor
distal ends
movable
arms
Prior art date
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Expired - Lifetime
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US768825A
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English (en)
Inventor
John J Mikos
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.)
S&C Electric Co
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S&C Electric Co
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Publication date
Application filed by S&C Electric Co filed Critical S&C Electric Co
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Publication of US3576414A publication Critical patent/US3576414A/en
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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
    • H01H33/166—Impedances connected with contacts the impedance being inserted only while closing the switch
    • 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
    • H01H31/30—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 actuated through the movement of one or more insulators

Definitions

  • Lockwood ABSTRACT Ahigh voltage center break disconnecting switch has a resistor assembly upstandingly mounted on, movable with, and electrically mounted on an insulator pivotable about a vertical axis.
  • a conducting arm extends from the other end of each resistor assembly toward the other arm to complete a conductive path in the atmosphere between their distal ends and through the resistor assemblies in advance of the completion of a conductive path through the switch blades as they are swung into contact engagement at their distal ends.
  • a center break switch construction such as that disclosed in the above identified patent, is modified to insert a resistor in the circuit while the 'switch is being closed for limiting the inrush current and to short circuit the resistor when the switch is in the closed position.
  • a resistor assembly is mounted in upstanding relation on each switch blade adjacent its pivot axis.
  • a conducting arm extends from the upper end of each resistor assembly toward the other arm with the arrangement being such that a spark gap is formed between the anns during closure of the switch blades in series with the resistor assemblies which is shorter than the gap between the distal ends of the switch blades.
  • each resistor assembly includes a weatherproof housingof porcelain or the like having terminals at its ends interconnected by the enclosed resistance element in the form of cakes of conducting-material.
  • the lower terminal includes a clamp section for attachment to the switch blade while the upper terminal has the conducting arm secured thereto. At their distal ends in the switch closed position the resistor inserting anns are spaced from each other.
  • the arms extend angularly from the vertical plane of the respective in FIG. I, certain parts being broken away in order to illustrate certain internal details of construction.
  • FIG. 3 is a view, at an enlarged scale, taken generally along the line 3-3 of FIG. 1, certain parts being broken away in order to show the internal details of construction;
  • the reference character 10 designates, generally, one pole of a polyphase switch and interrupter assembly provided with re-' sistance inserting means embodying this invention.
  • the reference character 10 designates, generally, one pole of a polyphase switch and interrupter assembly provided with re-' sistance inserting means embodying this invention.
  • three poles are employed.
  • the pole 10 includes a frame base 11 that'can be constructed of welded rolled steel angle sections with suitable bracing. At the left there is mounted a stationary insulator stack 12. Also mounted on the frame base 11 are first and second rotatable insulator stacks 13 and 14. Suitable bearings are provided for mounting the lower ends of the insulator stacks l3 and 14 about vertical axes on the frame base 11.
  • the height of the insulator stacks 12, 13 and 14 varies, depending upon the voltage of the system in which the pole 10 is connected.
  • each insulator stack may comprise a single insulator, such as a porcelain insulator.
  • a number of separate insulators having metallic fittings at their ends are bolted together endwise in order to accommodate the voltage used.
  • shafts 15 and 16 extend downwardly from the rotatable insulator stacks 13 and 14 and each carries an operating arm 17 and 18.
  • Mechanism is provided for rotating the operating arms 17 and 18 and thereby shafts 15 and 16 in opposite directions.
  • This mechanism includes links 19 and 20 which are connected at one end to the respective operating arm 17 and 18. At their other ends the links 19 and 20 are connected respectively to crank arms 21 and 22 that extend from a crank shaft 23. On rotation of the crank shaft 23 through slightly more than from the position shown in FIG. 2 the links 19 and 20 are actuated to effect rotation of the shafts l5 and 16 and thereby of the first and second rotatable insulator stacks l3 and 14 respectively.
  • the frame base 11 is suitably enclosed to protect the operating mechanism from the weather. This includes ice shield plates, one of which is indicated at 27.
  • the stationary insulator stack 12 at its upper end carries a line terminal 30 which one end of a circuit interrupter, in-
  • the other end of the cirv cuit interrupter 31 is mounted on a metallic mechanism housing 32 which has a bearing and contact extension 33 extending therefrom and is journaled on the upper end of the first rotatable insulator stack 13.
  • a suitable linkage within a housing 34 mechanically interconnects the first rotatable insulator stack 13 and the mechanism within the metallic housing 32 for operating the circuit interrupter 31'.
  • the mounting bracket 35 includes a bottom clamp fitting 36 having thereabove a cooperating top clamp fitting 37 connected thereto by bolts 38.
  • the clamp fittings 36 and 37 have clamping engagement with a switch blade 39 the distal end 40 of which is arranged to have contact engagement with the distal end 41 of a switch blade 42 which is mounted on and is movable with the second rotatable insulator stack 14.
  • the mounting of the switch blade 42 on the second rotatable insulator stack 14 is similar to the mounting of the switch blade 39 on the first rotatable insulator stack 13.
  • the mounting arrangement for the switch blade 42 includes a bifurcated mounting bracket 43 that is secured to and rotates with the second rotatable insulator stack 14.
  • the mounting bracket 43 includes a bottom clamp fitting 44 and a cooperating top clamp fitting 45 interconnected by bolts 46 for holding the clamp fittings 44 and 45 in clamping engagement with the switch blade 42.
  • a line terminal 47 extends laterally from between the arms of the bifurcated mounting bracket 43 and is suitably journaled therebetween.
  • FIG. 1 the switch blades 39 and 42 are shown by broken lines in the switch open position. 0n rotation of the crank shaft 23 in the manner previously described the switch blades lines,.to the-open position. On reverse rotation of the crank shaft 23 the switch blades 39 and 42 are rotated in the directions indicated by arrows 49 and 50, respectively, to swing the distal ends 40 and 41 into contact engagement with each other to complete a circuit between the line terminals 30 and 47 through the circuit interrupter 31 which, after having opened the circuit during the initial rotation of the crank shaft 23 in a switch opening direction, is reclosed while the switch blades 39 and 42 are being swung to their full open positions as shown by broken lines in FIG. 1.
  • the resistor assemblies 53 and 54 carry conductor arms 55 and 56 the distal ends 57 and 58 of which are offset so thatthey overlap with substantial mechanical clearance such that there is little likelihood of their being encased jointly in ice or sleet or, if they are so encased, the ice can be readily ruptured for circuit opening purposes.
  • Corona balls 59 and 60 are carried by the distal ends 57 and 58 at their extremities.
  • the arms 55 and 56 extend angularly from the vertical plane of the respective switch blade 39and 42 on the side thereof facing the direction of closing movement.
  • the reason for this arrangement is to provide a shorter spark gap between the distal ends 57 and 58 of the conductor arms 55 and 56 than is present between the distal ends 40 and 41 of the switch blades 39 and 42 as they are pivoted toward the switch closed position.
  • sparking takes place initially between the distal ends 57 and 58 of the conductor arms 55 and 56 and current flow takes place through the resistor assemblies 53 and 54 until they are short circuited on engagement of the distal ends 40 and 41 of the switch blades 39 and 42 as they are pivoted into the switch closed position.
  • FIG. 3 shows the details of construction of the resistor assembly 54. It will be understood that the details of construction of the resistor assembly 53 are identical.
  • a cylindriical insulating housing 65 is shown that may be formed of porcelain.
  • the housing 65 has a corrugated surface 66 to increase the creepage distance between the ends and to provide the necessary voltage withstandability under adverse weather conditions.
  • a lower terminal 67 is secured by cement 68 to the lower end of the insulating housing 65.
  • Depending studs 69 ex- .tend into the upper portion of the associated top clamp fitting 45 for the purpose of mounting the resistor assembly 54 to pivot conjointly with the associated switch blade 42.
  • This construction makes it feasible to modify switch constructions, such as that shown in F I68.
  • the insulating housing 65 has an upper terminal 70 which is secured thereto by cement 71 and is connected by bolts 72 to a clamp member 73 from which a tubular conductor 74 extends and which comprises the conductor arm 56 previously referred to.
  • the tubular conductor 74 is employed for the purpose of minimizing corona.
  • the tubular conductor 74 is'formed of aluminum alloy to minimize its weight.
  • the corona ball 60 is securedin position by a transverse pin 75.
  • the insulating housing 65 there is a stack-of cylindrical resistor cakes 78.
  • the number of cakes 78 and theirindividual resistance are selected in accordance with the charac teristics of the circuit in which the switch 10 is connected. Also the resistor cakes 78 are selected with consideration being given to'their thermal capacity when subjected to relatively high current flow.
  • the stack of cylindrical resistor cakes 78 is connected betweenthe lower and upper terminals 68 and 70 in such manner that no sparking takes place at any point therebetween. This top desirable in order to avoid radio interterence.
  • a bottom contact plate assembly 79 is employed for interconnecting the lowermost cake 78 to the lower terminal 67 which is solidly connected to the top clamp fitting 45 and thereby to the respective switch blade 42.
  • a bottom guide rod ring 80 Surrounding the bottom contact plate assembly 79 is a bottom guide rod ring 80 which is connected by guide rods 81, preferably three in number, to a top guide ring 82 which overlies the upper surface of the uppermost resistor cake 78.
  • a flexible shunt 83 interconnects the underside of a top contact plate assembly 84 and the upper end of the uppermost cake 78 while a coil compression spring 85 reacts between the top contact plate assembly 84 and the portion of the flexible shunt 83 overlying the top surface of the uppennost cake 78 to maintain a good conducting path therebetween for the purpose noted above.
  • the upper side of the top contact plate assembly 84 is in good contact engagement with the underside of the clamp member 73 and it extends through an annular plug 86 that is threaded, as indicated, into the upper terminal 70.
  • An O-ring 87 is interposed between the annular plug 86 and the juxtaposed surface of the top contact plate assembly.
  • resistor assembly 54 While it is preferable to provide the two resistor assemblies 53 and 54 the manner described, it is possible to employ only a single resistor assembly, for example the resistor assembly 54. In such case the conductor arm 55 is employed but, instead of the resistor assembly 53, a solid conductor is substituted. However, such a construction requires more space above the switch 10 to provide equivalent operating characteristics and such space may not be available or desirable to use.
  • a resistor inserting switch construction having a pair of parallel spaced apart insulators pivotally mounted at one end about the respective longitudinal axis, each having a switch blade at its other end movable therewith for contact engagement at its distal end with the other switch blade on conjoint pivotal movement of said insulators, said switch construction being characterized by a first conductor arm mounted on, electrically connected to one of said switch blades, extending therealong and movable unitarily therewith,
  • resistor assembly mounted on and electrically connected at one end to the other of said switch blades and movable unitarily therewith, and
  • a second conductor arm mounted on, movable with, and electrically connected at one end to the other end of said resistor assembly and extending toward said first conductpr arm to complete a conductive path in the atmosphere between the distal ends of said arms through said resistor assembly in advance of completion of a conductive path through said switch blades as they are swung toward contact engagement at their distal ends,
  • a resistor inserting switch construction having a pair of parallel spaced apart insulators pivotally mounted at one end about the respective longitudinal axis, each having a switch blade at its other end movable therewith for contact engagement at its distal end with the other switch blade on conjoint pivotal movement of said insulators, said switch construction being characterized by said distal ends of said arms being vertically spaced apart in the closed position of said switch blades. 4. The resistor inserting switch construction according to claim 3 wherein each arm extends angularly from the vertical plane of the respective switch blade on the side facing the direction of closing movement thereof.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
US768825A 1968-10-18 1968-10-18 High voltage switch with preinsertion resistor Expired - Lifetime US3576414A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US76882568A 1968-10-18 1968-10-18

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US3576414A true US3576414A (en) 1971-04-27

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GB (1) GB1227729A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3697712A (en) * 1971-01-07 1972-10-10 S & C Electric Co High voltage switch with preinsertion resistor connected in the circuit through graphite corona balls
US4695918A (en) * 1986-07-24 1987-09-22 S&C Electric Company Pre-insertion inductor arrangement
US4788390A (en) * 1988-04-26 1988-11-29 Siemens Energy & Automation, Inc. Shunt capacitor switch with an impedance insertion element
US5198630A (en) * 1990-10-26 1993-03-30 Gec Alsthom Energie Inc. Resistance insertion type circuit-breaker
US6483679B1 (en) 2001-06-18 2002-11-19 Southern States, Inc. Capacitor switch with external resistor and insertion whip
US8445805B2 (en) 2011-01-07 2013-05-21 Michael David Glaser Vacuum switch with pre-insertion contact
US10170255B1 (en) 2018-06-26 2019-01-01 Michael D. Glaser Vacuum capacitor switch with pre-insertion contact

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1108714B (it) * 1978-06-26 1985-12-09 Ave Belli Andrea Interruttore elettrico perfezionato

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB430452A (en) * 1934-03-28 1935-06-19 John Swinney Improvements relating to electric circuit interrupters
GB530338A (en) * 1939-06-21 1940-12-10 British Thomson Houston Co Ltd Improvements relating to gas blast electric circuit breakers
US2710322A (en) * 1953-08-17 1955-06-07 Eastern Power Devices Ltd Circuit interrupter
FR1226998A (fr) * 1958-06-11 1960-08-18 D App Electr Sprecher Et Schuh Sectionneur pour la coupure de courants de puissance en particulier pour installations à très haute tension
US3235694A (en) * 1962-11-13 1966-02-15 Ite Circuit Breaker Ltd High voltage double break air switch with damping resistors
US3291947A (en) * 1964-06-12 1966-12-13 Westinghouse Electric Corp Interrupting structures for compressedgas circuit interrupters having double-break hollow rotative moving contact-arm assembly

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB430452A (en) * 1934-03-28 1935-06-19 John Swinney Improvements relating to electric circuit interrupters
GB530338A (en) * 1939-06-21 1940-12-10 British Thomson Houston Co Ltd Improvements relating to gas blast electric circuit breakers
US2710322A (en) * 1953-08-17 1955-06-07 Eastern Power Devices Ltd Circuit interrupter
FR1226998A (fr) * 1958-06-11 1960-08-18 D App Electr Sprecher Et Schuh Sectionneur pour la coupure de courants de puissance en particulier pour installations à très haute tension
US3235694A (en) * 1962-11-13 1966-02-15 Ite Circuit Breaker Ltd High voltage double break air switch with damping resistors
US3291947A (en) * 1964-06-12 1966-12-13 Westinghouse Electric Corp Interrupting structures for compressedgas circuit interrupters having double-break hollow rotative moving contact-arm assembly

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3697712A (en) * 1971-01-07 1972-10-10 S & C Electric Co High voltage switch with preinsertion resistor connected in the circuit through graphite corona balls
US4695918A (en) * 1986-07-24 1987-09-22 S&C Electric Company Pre-insertion inductor arrangement
US4788390A (en) * 1988-04-26 1988-11-29 Siemens Energy & Automation, Inc. Shunt capacitor switch with an impedance insertion element
US5198630A (en) * 1990-10-26 1993-03-30 Gec Alsthom Energie Inc. Resistance insertion type circuit-breaker
US6483679B1 (en) 2001-06-18 2002-11-19 Southern States, Inc. Capacitor switch with external resistor and insertion whip
US6597549B2 (en) 2001-06-18 2003-07-22 Southern States Llc Capacitor switch with external resistor and insertion whip
US8445805B2 (en) 2011-01-07 2013-05-21 Michael David Glaser Vacuum switch with pre-insertion contact
US10170255B1 (en) 2018-06-26 2019-01-01 Michael D. Glaser Vacuum capacitor switch with pre-insertion contact

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