US2748211A - Disconnecting switch - Google Patents

Disconnecting switch Download PDF

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Publication number
US2748211A
US2748211A US513730A US51373055A US2748211A US 2748211 A US2748211 A US 2748211A US 513730 A US513730 A US 513730A US 51373055 A US51373055 A US 51373055A US 2748211 A US2748211 A US 2748211A
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US
United States
Prior art keywords
yoke
lever system
gear
gears
levers
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
US513730A
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English (en)
Inventor
Butz Lothar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BBC Brown Boveri AG Germany
BBC Brown Boveri France SA
Original Assignee
BBC Brown Boveri France SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BBC Brown Boveri France SA filed Critical BBC Brown Boveri France SA
Application granted granted Critical
Publication of US2748211A publication Critical patent/US2748211A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01H31/34—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact adapted to engage an overhead transmission line, e.g. for branching
    • H01H31/36—Contact moved by pantograph

Definitions

  • This invention relates to electrical disconnecting switches of the pole type and particularly to those wherein the movable contact piece is mounted upon the outer end of a system of jointed levers capable of great extension commonly referred to as a lazy-tongs or extensible lever system.
  • the extensible lever system is mounted upon an insulating support and the contact piece at the outer end of the lever system is adapted to move into engagement with a stationary contact member when the lever system is extended.
  • This type of disconnect switch has been developed for use with very high voltage systems and is commonly applied in situations where the stationary contact member is constituted by an overhead line or bus bar itself or to a contact member fastened to the line or bus bar.
  • the extensible lever system is mounted upon a pedestal type of insulating support, and the other electrical line with which electrical contact is established through the stationary and movable contact pieces and the extensible lever system, is secured to the insulating support, there being an electrical connection made between the base of the extensible lever system and said other electrical line.
  • a gripper type of contact suffers from the disadvantage that it requires an unnecessarily large spacing between adjacent overhead lines. This is due to the fact that when the overhead line or bus bar runs parallel to the lower branch line fastened to the insulator pedestal which supports the extensible lever system it is necessary to arrange the switching mechanism such that the arms of the gripper or the lever elements of the extensible lever system move in a plane normal to the plane of the lines so that the gripper may grasp the opposite, i. e. stationary contact. This is essential, since the gripper, being a continuation of the extensible lever system must move in the same plane as the latter. Hence, the
  • Another known arrangement for assuring proper contact pressure is to construct the stationary contact member in the form of an open cup or tulip-shape.
  • the movable contact member at the end of the extensible lever system is so constructed as to enter the cup or tulip shaped contact and spread after insertion thus establishing good contact pressure inside the cup.
  • a contact arrangement of this type is, however, satisfactory only on lines where the line space between adjacent supports is relatively short and swinging motion of the line is inconsequential. This for the obvious reason that otherwise the movable contact member might miss the opposite, tulip contact entirely and hence fail to close the electrical circuit between the contacts.
  • the diameter of the tulip shaped contact could be made disproportionately larger so as to ensure entry of the movable contact but this has its limitations from a. practical point of view.
  • the object of this invention is to provide an improved construction for the movable contact member at the end of an extensible lever system type of disconnect switch which will accomplish the necessary contact pressure in a simple and reliable manner when the switch is closed, and also require a minimum of spacing.
  • the movable contact member in the form of a yoke and wherein the arms of the yoke are adapted to rotate toward each other after the yoke has embraced the stationary conductor thus establishing adequate contact pressure with the stationary conductor. Movement of the arms of the yoke is effected by means of a gearing arrangement actuated by movement of the extensible levers themselves.
  • Fig. 1 is a view in side elevation of the disconnecting switch, the extensible lever system being shown in its raised, extended position and with the yoke engaged with the stationary overhead conductor. This view also shows the yoke in dot-dash lines in the position which it occupies just prior to closing of the yoke arms into contact with the overhead conductor.
  • Fig. 2 shows the extensible lever system in the lowered, retracted position on its pillar type insulating support, this view also showing the position of the yoke at an intermediate point between the fully retracted and fully extended positions of the extensible lever system.
  • Fig. 3 is a sectional view drawn to a larger scale of the yoke, its supporting structure and the gearing by which the yoke arms are shifted between their outstretched position and the position contacting opposite sides of the overhead conductor.
  • Fig. 4 is a section taken on line 4-4 of Fig. 3;
  • Fig. 5 is a view showing a modified construction for actuating the arms of the yoke.
  • the improved disconnect switch includes a base 1 on which is supported a pillar type insulator 2. Carried at the top of insulator 2 is a housing 3 in which is contained gearing (not shown) by which the extensible lever system is raised and lowered.
  • gearing (not shown)
  • a drive shaft (not shown) extends upwardly from the interior of base 1 through a separate insulator column 5, parallel to pillar insulator 2, into gear housing 3.
  • the upper end of the drive shaft is coupled to the gearing in this e housing and the lower end is coupled to motor means (not shown) located in the base 1.
  • the extensible lever systems includes two sets of levers, thelevers of each set being pivotally connected in end-toend relation.
  • One set comprises the levers 6, 6 and 6" pivotally connected at their ends by pivots 7 and 7'.
  • the other set comprises levers 8, 8 and 8" pivotally connected at their ends by pivots 9 and 9'.
  • the lower ends of levers 6 and 8 are pivotally mounted at 10, 10 on the gear housing 3 and are rotated about such pivots by the gearing in such housing.
  • a pivoted link system consisting of two short links 11, 11' interconnects intermediate points of levers 6 and 8, the links being pivotally connected together at their adjoining ends by pivot 12 and the outer ends of the links being connected pivotally at 13, 13 respectively to levers 8 and 6'.
  • the movable contact assembly of the disconnect switch is carried by the outer ends of levers 6" and 8 and is indicated generally by reference numeral 14.
  • the assembly 14 comprises a housing 15 to which the outer end of lever 8 is rigidly secured, a set of four intermeshed bevel gears 16a16d and a pair of arms 17, 17' forming a yoke which are adapted to move between an out-stretched position and a position contacting opposite sides of the overhead conductor 18.
  • the arms 17, 17' are mounted on concentric shafts 19, 1% respectively, the inner shaft 19 extending through gear 16a andbeing connected to an oppositely disposed coaxial gear 16b.
  • the outer shaft 19' is connected to gear 16a. Consequently, gears 16a, 16b constitute the output gears.
  • the two other bevel gears 160, 1.6a which are oppositely disposed and coaxially arranged and meshed with gears 16a, 16b constitute input gears and are mounted respectively on shafts 21, 21.
  • a spur gear 22 secured upon shaft 21 drives the latter, and a spur gear 22' is secured upon shaft 21 to drive it.
  • Gears 22, 22 are provided with teeth around their entire periphery and are adapted to mesh respectively with drive gears 23, 23' secured upon a shaft 24 that is rotated by lever 6".
  • the teeth of the drive gears 23, 23' extend over only a portion of their peripheries, and the toothed portions 23a, 23a lie about 180 apart as related to the axis of drive shaft 24. Consequently, the teeth 23a on gear 23 never mesh with the teeth on gear 22 at the same time teeth 23a on gear 23' mesh with the teeth on gear 22.
  • Fig. 3 shows the position of the outer ends of levers 6", 8" when the lever system is retracted according to the position of Fig. 2 and the corresponding positions of the yoke.arms 17, 17 and gearing tea-and, 22, 22 and 23, 23. In this position it will be observed that the teeth 23a on gear 23 are in mesh with the teeth on gear 22.
  • lever 6 rotating shaft 24 and gears 2'5, 23 elfects rotation of gear 22 and shaft 21 and gear 16c. in this condition gear 22" being out of mesh with gear 23 and hence also shaft 21 and bevel gear 16d are free, and gear 16d functions as an intermediate gear.
  • the levers which make up the extensible lever system are made-from electrically conductive metallic material and hence complete an electrical circuit from the overhead line contact 18 to the other side of the line, conductor 25, which is supported by gear housing 3 at the top of insulator pillar 2.
  • the disconnect switch is opened, the sequence of operations above described for closing the circuit, is simply reversed, the final position of the lever system being as indicated in Fig. 2.
  • Fig. 5 shows a slightly modified construction wherein the movable contact assembly 26 performs only one tuming motion, and such motion takes place at the end of the closing movement for the purpose of securely engaging the overhead contact member.
  • the gearing of the contact assembly 26 is altered from that described for contact assembly .14 to meet the different operating arrangement, and both sets of levers 27, 28 are pivotally connected to the contact assembly 26.
  • the double yoke, arms 29, 29 always move in line with the axis of the insulator support pillar,.and a somewhat shorter yoke can therefore be used than is required for the embodiment shown in Figs. l-4.
  • the height of the extensible lever system 27 28 will be shorter when in the retracted, open circuit position.
  • the movable contact assembly is in the form of a double yoke.
  • the movable contact assembly in cases of multiple conductors it is possible to construct the movable contact assembly as a single yoke because the yoke will be positioned between two double bars when the switch is being closed, and the yoke, when turning, will be able to exert sufficient contact pressure against the over head conductor without difficulties.
  • a, disconnect switch with the movable contact assembly as above described has the added great advantage in that the switch can be arranged within the switchboard assembly without regard to the relative position of the conductors which are to be connected by the switch. Furthermore, the space requirement of the switch is reduced to a minimum.
  • a disconnecting switch comprising an extensible lever system mounted upon an insulating support and movable between a retracted open circuit position to an extended closed circuit posit-ion, a movable contact assembly carried by the upper end of said lever system, said assembly including a yoke mounted for rotation thereon to make and break contact with an overhead conductor, gearing means for effecting rotation of said yoke, and means controlled by movement of said lever system for actuating said gearing means and hence also said yoke.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Gas-Insulated Switchgears (AREA)
US513730A 1954-06-09 1955-06-07 Disconnecting switch Expired - Lifetime US2748211A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH2748211X 1954-06-09

Publications (1)

Publication Number Publication Date
US2748211A true US2748211A (en) 1956-05-29

Family

ID=4571474

Family Applications (1)

Application Number Title Priority Date Filing Date
US513730A Expired - Lifetime US2748211A (en) 1954-06-09 1955-06-07 Disconnecting switch

Country Status (4)

Country Link
US (1) US2748211A (de)
CH (1) CH320539A (de)
DE (1) DE1029446B (de)
FR (1) FR1125309A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2774832A (en) * 1956-02-16 1956-12-18 Eastern Power Devices Ltd High tension disconnecting switch
US2830145A (en) * 1955-02-11 1958-04-08 Porter Co H K Isolator switch
US2988611A (en) * 1958-05-21 1961-06-13 Asea Ab Isolating switch of the pantograph type
CN103620717A (zh) * 2011-06-17 2014-03-05 西门子公司 露天开关装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1080660B (de) * 1958-10-10 1960-04-28 Licentia Gmbh Scherentrenner
NL253677A (de) * 1959-07-18

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT437776A (de) *
CH296803A (de) * 1950-02-17 1954-02-28 Siemens Ag Trennschalter.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2830145A (en) * 1955-02-11 1958-04-08 Porter Co H K Isolator switch
US2774832A (en) * 1956-02-16 1956-12-18 Eastern Power Devices Ltd High tension disconnecting switch
US2988611A (en) * 1958-05-21 1961-06-13 Asea Ab Isolating switch of the pantograph type
CN103620717A (zh) * 2011-06-17 2014-03-05 西门子公司 露天开关装置
CN103620717B (zh) * 2011-06-17 2016-11-09 西门子公司 露天开关装置

Also Published As

Publication number Publication date
DE1029446B (de) 1958-05-08
CH320539A (de) 1957-03-31
FR1125309A (fr) 1956-10-29

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