US1843805A - Electric switchgear - Google Patents

Electric switchgear Download PDF

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Publication number
US1843805A
US1843805A US517610A US51761031A US1843805A US 1843805 A US1843805 A US 1843805A US 517610 A US517610 A US 517610A US 51761031 A US51761031 A US 51761031A US 1843805 A US1843805 A US 1843805A
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US
United States
Prior art keywords
chamber
busbar
breaker
circuit
conductor
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
US517610A
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English (en)
Inventor
Christie John
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.)
A Reyrolle and Co Ltd
Original Assignee
A Reyrolle and Co Ltd
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 A Reyrolle and Co Ltd filed Critical A Reyrolle and Co Ltd
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Publication of US1843805A publication Critical patent/US1843805A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing

Definitions

  • busbars are sometimes in separate chambers and are kconnected through isolating or selecting switches to a common connection in an inter mediate chamber', such common connection leading to the main circuit-breaker.
  • each busbar is in a separate chamber and its connection to the main circuit-breaker is effected by a rotary member or isolating switch which makes and breaks the circuit'at two points.
  • each containing one of the busbars are arranged over another chamber, and passing vthrough each busbar chamber into the chamber beneath it is a rotary member in the form of an insulating bushing surrounding a conductor having at each end a switch arm.
  • the arm at the upper end makes connection with the busbar andthat at the lower end with a condu'ctorfleading down 'to 'the main circuitbreaker.
  • the arrangement comprises for each of the busbars vwhat may be termed a double-ended rotary isolating switch which iscapable of connecting its own busbar with thecircuit-breaker or ⁇ 'of breaking such connection at ltwo points', one in the separate busbar chamber and the other in the intermediate vchamber. It will be appreciated therefore that the ⁇ isolation of either busbar can be most completelyand readilyveifected.
  • a convenient practical construction according to the invention isIillust-rated by way of 517,610, and in Great Britain March 26, 19730.
  • Figure 2 is a section on the line 2 2 of Figure l
  • t Figure 3 is a'horizontal section taken just beneath the cover plate of the uppermost chamber
  • each busbar chamber B Passing through from each busbar chamber B into the lower chamber C is a conductor D mounted within an insulating bushing D1.
  • Each conductor D carries two switch arms E F respectively at its upper and lower ends.
  • the whole bushing D1 with the conductor D and switch arms E F is rotatable by means of the mechanism indi- 2' ductor and bushing in theV earthed position.
  • the upper switch arm E engages with a. cont-act A2 to which the busbar is connected, and the lower switch arm F' engages with a contact ring H1 surrounding a tubular casing H in the chamber C.
  • the two switch arms E F engage respectively with earthed contacts El F1 mounted on the walls of the chambers.
  • the tubular casing I-I extends from the top to the bottom of the chamber C and a detachable cover plate H2 is provided over its upper end. Atits lower end the casing I-I is provided with a ieXible4 extension H2, which is bolted on to the cover plate J2 of the circuit-breaker tank J.
  • the casing H contains a conductor K surrounded by a condenser-insulator K1. At its upper end the conductor K carries a spring Contact K2 engaging with the inside of the contact ring H1, whilst at the lower end the conductor makes a plug and socket connection with ,one oi? the iiXed circuit-breaker contacts L.
  • the other fixed circuit-breaker contact L1 which is connected to the Contact L through a movable bridging contact L2 in the usual manner, is connected through a plug and socket ConnerL tion to a conductor M surrounded by a condenser-insulator M1.
  • the conductor M is mounted within a tubular casing N which passes through an oil-illed chamber O, its upper end being closed by a cover plate N2, and is provided at its lower end with a flexible extension N3.
  • the conductor M carries at its upper end a spring contact M2 engaging with the inside of a contact ring N1 on the tubular casing N.
  • the arrangement ot the conductor M and tubular casing N is simV ilar to that of the conductor K and casing PI, and is such that on opening up the cover plates H2 N2 and unbolting the flexible extensions IhI3 N3 from the cover plate J1 oi the tank, the conductors M and K can be withdrawn upwardly to facilitate removal of the whole circuit-breaker :tor inspection or repair.
  • the details of construction of the tubular casings and the withdrawable conductors do not in themselves torni part of the present invention.
  • the contact ring N1 is connected through a switch arm P in the chamber O to a terminal Q1 to which the cable or feeder Q is connected, the arm P being movable by suitable mechanism indicated at Pl from the opera-tive position (shown in full lines) into an earthing position (shown dotted) in which it makes contact with an earthed contact P2 on the wall of the chamber O.
  • a further switch arm R may also be provided, which can be moved from a normal inoperative position into a position (shown dotted) in which it earths the cable terminal Q1.
  • Suitable interlocking mechanism may be provided to prevent the two, isolating switches D, E, F from occupying their operative positionsat the sameY time, it as is sometimes the case it is desirable to prevent the two busbars A from being connected together.
  • Interlocking mechanism may also be provided having the usual func tion of preventing operation of an isolating switch while the main circuit-breaker contacts L, L1, L2 closed.
  • metal clad electric switchgear for use in high voltage duplicate busbar systems, the combination of a circuit-breaker, two bus bars to be selectively connected thereto, a separate chamber for each busbar, a busbar contact in each such chamber, a third chamber adjacent to the busbar chambers, a contact in the third chamber connected to the circuit-breaker, two rotary isolating switches respectively passing from the two busbar chambers into the third chamber and each comprising an insulating bushing, a conductor within such bushing and a switch arm at each end of the conductor, and means whereby rotation of either isolating switch causes its two switch arms to engage with or be disengaged from the busbar contact and the contact connected to the circuit-breaker.
  • metal-clad electric switchgear for use in high voltage duplicate busbar systems, the combination of a circuit-breaker, two busbars to be selectively connected thereto, a separate chamber for each busbar, a busbar contact in each such chamber, a third chamber adjacent to the busbar chambers, a -contact in the third chamber connected to the circuit-breaker, earthed contacts in the three chambers, two rotary isolating switches respectively passing from the two busbar chambers into the third chamber and each comprising an insulating bushing, a conductor within such bushing and a switch arm at each end of the conductor, and means whereby either isolating switch can be rotated to bring its switch arms into engagement either i withtlie earthed contacts or with thetbusbar contact and the contact connected to the circuit breaker.
  • a metal-clad electric switchgear for use in high voltage duplicate busbar systems, the combination of a circuit-breaker, a tank containing the circuit-breaker, two busbars to be selectively connected to the circuitbreaker, a separate chamber for each busbar, a third chamber between the circuit-breaker tank and the busbar chambers, a conductor leading from the circuit-'breaker into the third chamber, two isolating switches respectively passing from the two busbar chambers into the third chamber, and meansfor operating each isolating switch whereby it will connect its busbar to the conductor leading from the circuit-breaker or will break such connection at two points one in the bus- A par chamber and the other in the third chamier.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Gas-Insulated Switchgears (AREA)
US517610A 1930-03-26 1931-02-21 Electric switchgear Expired - Lifetime US1843805A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9598/30A GB353491A (en) 1930-03-26 1930-03-26 Improvements in or relating to electric switchgear

Publications (1)

Publication Number Publication Date
US1843805A true US1843805A (en) 1932-02-02

Family

ID=9875065

Family Applications (1)

Application Number Title Priority Date Filing Date
US517610A Expired - Lifetime US1843805A (en) 1930-03-26 1931-02-21 Electric switchgear

Country Status (3)

Country Link
US (1) US1843805A (fr)
FR (1) FR714450A (fr)
GB (1) GB353491A (fr)

Also Published As

Publication number Publication date
GB353491A (en) 1931-07-27
FR714450A (fr) 1931-11-13

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