US2123069A - Electric switch gear - Google Patents

Electric switch gear Download PDF

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Publication number
US2123069A
US2123069A US44740A US4474035A US2123069A US 2123069 A US2123069 A US 2123069A US 44740 A US44740 A US 44740A US 4474035 A US4474035 A US 4474035A US 2123069 A US2123069 A US 2123069A
Authority
US
United States
Prior art keywords
oil
rod
mercury
casing
pillar
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
US44740A
Other languages
English (en)
Inventor
Thumim Carl
Harold E Strang
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.)
General Electric Co
Original Assignee
General Electric Co
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
Priority to BE417873D priority Critical patent/BE417873A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US44740A priority patent/US2123069A/en
Priority to GB27475/36A priority patent/GB463929A/en
Priority to FR811821D priority patent/FR811821A/fr
Application granted granted Critical
Publication of US2123069A publication Critical patent/US2123069A/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
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H01H33/55—Oil reservoirs or tanks; Lowering means therefor

Definitions

  • Our invention relates to electric switchgear, more particularly to high tension circuit breakers of the liquid-break or oil insulated type designed for comparatively high operating speed.
  • the principal object of our invention is the provison of means for increasing the efficiency and. EO speed of a high tension circuit breaker of the aforesaid type and simplifying the operating mechanism and the insulation thereof.
  • Fig. 1 is an eleva- 4(')*"tional View, partly in section, of a high tension circuit breaker to which our invention is applied
  • Fig. 2 is an enlarged sectional view of a portion of the structure shown by Fig. 1 illustrating our invention.
  • the high tension circuit breaker illustrated by way of example, comprises a pair of horizontally arranged circuit breaker units l and 2 which are supported by vertical insulating pillars, 3, 4 and 5 mounted on structural framework 6.
  • the framework 6 likewise supports suitable operating mechanism 1 for the circuit breaker, which may be of any suitable type, such as the well known spring-operated type for example.
  • the operating mechanism is connected to the movable contact structure in the breaker units l and 2 by means of an actuating rod 8 which extends vertically through the central insulating pillar 4 and connects, in any suitable manner, at the junction 9 with the movable contact structure in the opposite units.
  • circuit breaker itself is unnecessary for a clear understanding of the present invention, other than to point out that the breaker or interrupting units l and 2 contain a suitable insulating and are extinguishing liquid, such as oil, within which the relatively movable breaker contacts are immersed.
  • the circuit breaker may be of the character disclosed and claimedin a copending application Serial No. 25,267, filed June 6, 1935, by David C. Prince for Electric circuit breakers and assigned to the same assignee as the present invention.
  • circuit breaker The operation of the circuit breaker is eiTected by reciprocal movement of the rod 8 which is connected at its lower end, at Hi to a pivoted mechanism arm Hi by links I I.
  • the operating rod 8 which extends centrally of the insulating pillar 4, is oil insulated.
  • the conventional type of seal such as a stuifing box, has proved inadequate for preventing loss of a liquid having a low surface tension, such as oil.
  • the rod 8 is immersed in oil within the pillar 4 and is provided with a low friction liquid seal at I l2 which is effective not only to maintain the insulating oil within the pillar but which also offers inappreciable resistance to operation of the rod 8 which is directly connected to the operating mechanism at 7.
  • the insulating tube ll extends upwardly within the pillar and forms the casing for the insulating oil [9 within which the operating rod 8 is immersed.
  • the sealing arrangement between the oil casing and the operating arm ID of the mechanism comprises a low friction oil-mercury seal wherein a column of mercury is balanced by the head of oil 19 in the pillar 4.
  • the sleeve [5 is suitably joined to a depending cylinder 20 having a reduced portion 2
  • the inner periphery of the flange is united to a sleeve 23 which extends concentrically within the cylinder 2
  • the operating rod 8 which in the present instance is composed of a suitable, strong insulating material, as laminated wood impregnated with a synthetic resin, is provided with a reduced section 8' which extends centrally of the fixed sleeve 23.
  • a sleeve 25 which is closed at its upper end and arranged in telescopic relation with respect to the fixed sleeves 2
  • a body of mercury 26 of suitable volume is placed within said annular space prior to the addition of the oil l9.
  • an annular U-tube With the inverted cup 25 in the annular pocket as shown and spaced from the bottom thereof there is formed an annular U-tube, both branches of which contain an equal amount of mercury 26.
  • a suitable gasket or packing washer may be provided at 21 between the upper end of the sleeve 23 and the movable cup 25.
  • oil as used herein is intended to comprehend a suitable arc-extinguishing or insulating liquid.
  • mercury similarly used is intended to comprehend a suitable sealing liquid having a specific gravity greater than the oil.
  • a low friction liquid seal between said casing and rod comprising relatively movable telescopic structure secured to said casing and rod respectively so as to form a U-tube, one branch of which is in communication with said oil, and a body of mercury in said U-tube for balancing the head of said oil whereby relative movement of said rod can be effected at high speed without loss of said oil or mercury.
  • a liquid seal between said casing and rod comprising relatively movable telescopic structure secured to said casing and rod respectively so as to form a U-tube, one branch of which is in communication with said oil, a body of mercury in said U-tube for balancing the head of said oil whereby reciprocal movement of said rod can be efiected at high speed without loss of said oil or mercury, and means likewise coacting with said casing and rod for preventing loss of said mercury in case of momentary high pressure in said oil.
  • a liquid seal between said structures comprising a pair of concentric sleeves fixed with respect to one of said structures and forming an annular pocket, a body of mercury in said pocket, and means forming an inverted cup extending into said pocket and carried by the other of said structures so as to form an annular U-tube, one branch of said U-tube being in communication with the oil in said casing so that the head of said oil is balanced by said mercury, said operating rod structure having an extension freely movable centrally of said seal for connection to said operating mechanism, and packing means disposed at the other branch of said U-tube for preventing loss of mercury in case of momentary high pressure in said oil.
  • a liquid seal between said pillar and rod comprising relatively movable telescopic means secured respectively to said pillar and said rod forming a U-tube concentrically of said rod at the lower part of said pillar, said U-tube containing a body of mercury and arranged so that one branch thereof is in communication for all positions of said operating rod with the oil within said pillar whereby the head of said oil is balanced by said mercury, said operating rod extending freely through the central part of said U-tube for connection with said operating mechanism, and means for sub stantially precluding loss of mercury from said U- tube.

Landscapes

  • Gas-Insulated Switchgears (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
US44740A 1935-10-12 1935-10-12 Electric switch gear Expired - Lifetime US2123069A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE417873D BE417873A (en(2012)) 1935-10-12
US44740A US2123069A (en) 1935-10-12 1935-10-12 Electric switch gear
GB27475/36A GB463929A (en) 1935-10-12 1936-10-09 Improvements in and relating to liquid-break electric circuit breakers
FR811821D FR811821A (fr) 1935-10-12 1936-10-12 Perfectionnements à la commande d'appareils à haute tension

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US44740A US2123069A (en) 1935-10-12 1935-10-12 Electric switch gear

Publications (1)

Publication Number Publication Date
US2123069A true US2123069A (en) 1938-07-05

Family

ID=21934063

Family Applications (1)

Application Number Title Priority Date Filing Date
US44740A Expired - Lifetime US2123069A (en) 1935-10-12 1935-10-12 Electric switch gear

Country Status (4)

Country Link
US (1) US2123069A (en(2012))
BE (1) BE417873A (en(2012))
FR (1) FR811821A (en(2012))
GB (1) GB463929A (en(2012))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2570769A (en) * 1948-11-10 1951-10-09 Gen Electric Electric circuit interrupter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2570769A (en) * 1948-11-10 1951-10-09 Gen Electric Electric circuit interrupter

Also Published As

Publication number Publication date
FR811821A (fr) 1937-04-23
GB463929A (en) 1937-04-08
BE417873A (en(2012))

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