US2092652A - Electric circuit interupter - Google Patents

Electric circuit interupter Download PDF

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Publication number
US2092652A
US2092652A US758925A US75892534A US2092652A US 2092652 A US2092652 A US 2092652A US 758925 A US758925 A US 758925A US 75892534 A US75892534 A US 75892534A US 2092652 A US2092652 A US 2092652A
Authority
US
United States
Prior art keywords
arc
chamber
contact
explosion
oil
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
US758925A
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English (en)
Inventor
Ezra B Merriam
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 BE413029D priority Critical patent/BE413029A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US758925A priority patent/US2092652A/en
Priority to FR799837D priority patent/FR799837A/fr
Application granted granted Critical
Publication of US2092652A publication Critical patent/US2092652A/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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/72—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid having stationary parts for directing the flow of arc-extinguishing fluid, e.g. arc-extinguishing chamber
    • H01H33/75—Liquid-break switches, e.g. oil-break

Definitions

  • My invention relates to electric circuit interrupters of the single pole type wherein the circuit 4is opened within a pressure chamber containing an arc extinguishing liquid such as oil, and the pressure generated bythe resulting arc is utilized to eiect expulsion of liquid from said chamber for extinguishing the arc.
  • Electric circuit interrupters of the aforesaid type are commonly known as explosion chamber breakers and have long been used for interrupting high voltage power circuits.
  • a well known form of explosion chamber breaker comprises an insulated explosion pot forming the explosion chamber having at one end a xed contact structure.
  • a coacting contact rod is movable into said chamber through an exhaust opening or throat at the opposite end of said chamber. 'Ihe explosion pot and contact structure are immersed in a suitable insulating and arc-extinguishing liquid such as oil, the oil filling the explosion chamber.
  • the Well known explosion chamber effect is obtained; that is, the pressure generated within the explosion chamber by arc current causes a blast of oil through the arc as the movable contact passes through said throat.
  • the arc is generally interrupted at that point.
  • a principal object of my invention is the provision of an improved single pole electric circuit interrupter of the explosion chamber type, as contrasted with an interrupter having two ormore breaks in the same chamber, which is simple and r,inexpensive in construction and which-is effective to decrease the arcing time for breakers of the aforesaid type.
  • the explosion pot or chamber is provided with an exhaust opening or port extending substantially transversely of the path of the arc, as distinguished from the throat opening through which the movable contact may operate.
  • the width of the chamber corresponds roughly to its length so that appreciable arcing spaceis involved.
  • the arc may be drawn eccentrically with respect to the longitudinal axis of the chamberI so as to be adjacent and transverse of said exhaust port, the remaining portion or' the explosion chamber serving as an oil reservoir.
  • Fig. 1 is an eleval various single pole forms my invention may asn sume.
  • Fig. 1 illustrates the circuit interrupting means i of one pole of an oil' circuit breaker comprising an explosion pot I, relatively movable contacts 2 and 3, and an insulating and arc extinguishing liquid 4, such as oil, in which the explosion pot and contact structure are immersed.
  • oil as used hereinafter is intended to comprehend a suitable arcextinguishing liquid.
  • the explosion pot l is suit-- ably formed o f a mechanically strong insulating material, such as a laminated structure impregnated with a phenolic condensation product, and is secured in depending relation to a flange 5 of the stationary adapter 6.
  • the lead-in conductor l is insulated with respect to the circuit breaker tank (not shown) by the usual high voltage insulating bushing 8 at the lower end of ⁇ which,l at 9, is secured the contact adapter.
  • 'I'he fixed contact structure 2 comprises a butt contact resiliently biased, as by a spring l0, to-
  • an insulating cylindrieai shield I4 is mounted on' a flange I5 which is supported. as at i6, by the explosion pot securing means.
  • the movable rod contact 3 is mounted at one end of a bridging member Il, the other end of which carries the contact of the other and similar pole of the breaker (not shown).
  • the contact 3 is movable through an exhaust opening er throat I8 formed in the lower end of the explosion pot opposite the iixed contact 2.
  • the movable contact enters the explosion chamber eccentrically with respect to the longitudinal axis of said chamber for coaction with the xed contact 2.
  • an exhaust port I9 which is restricted as compared with the volume of the chamber, is formed in a lateral wall of the explosion pot adjacent and opposite the path of the arc.
  • the arc is drawn transversely of the exhaust port I9 while the arc is comparatively short.
  • One explanation of the improved interrupting characteristics of this form of explosion chamber may be based on the fact that the arc, which by reason of its Contact with the oil generates pressure within the explosion chamber at a high rate, is subjected as indicated tothe wash of the oil as it is expelled from the. chamber through the .lateral port I9.
  • the eccentric positioning of the movable contact within the explosion chamber not only provides an appreciable oil storage space opposite the exhaust port in the event of heavy short circuits, but also advantageously locates the arc with respect to the lateral exhaust port I9. In the event that the arc is not interrupted within the chamber the usual interrupting effect is also obtained at the throat I8.
  • Fig. 2 the explosion pot I is fundamentally similar to that of Fig. 1.
  • the contact 3 moves centrally of the explosion chamber through the lower throat I8.
  • the lateral port I9 is positioned in a side wall ofthe explosion pot as above described, and anllinsulating bailie 2I projects horizontally from the-inner wall of the explosion pot beneath the port: I9.
  • the purpose of this balile is to direct the oil ilow from the explosion chamber so as to intensify the how across the arc.
  • the operation is generally similar to Fig. 1.
  • Fig. 3 illustrates a simple application of my invention to circuit interrupters of the single break type wherein the movable contact member is elevated to open circuit position.
  • the circuit breaker tank 22 is lled with oil to the level indicated,the tank having suitable insulating lining 23.
  • a xed contact 24 is mounted at the lower part of the tank, and a movable rod contact 25 is guided for vertical reciprocal movement with respect to contact 24.
  • the contacts coact within an interrupting chamber 26 formed by a strong insulating cylinder 21 having a reinforcing lining 28.
  • An insulating disk 29 forms the upper wall of the interrupting chamber.
  • the rod contact 25 is guided within a bushing 30 forming a throat at the upper Wall of the interrupting chamber.
  • the arc pressure generated within the chamber 26 is effective to expel oil at a high rate through the port 3
  • the arc is generally interrupted after a short vertical travel of the contact 25 beyond the port so that there is no necessity for moving said contact out of the interrupting chamber 26.
  • Fig. 4 the explosion pot I 'is provided with the lateral port I9 at a point appreciably beyond the initial formation of the arc.
  • the lateral port I9 is adjacent the throat I8 so that, although the arc length is increased, the oil flow across the arc is concentrated at the'lower part of the chamber and is greatly intensified as the Contact 3 moves into the throat I8. A powerful cross blast effect is thereby obtained which has been found to be very eiective in interrupting heavy short circuits.
  • the explosion pot I is provided with an expulsion arc chute 33 mounted within the lateral port I9 and arranged to form a channel for receiving the arc.
  • the expulsion chute 33 may be suitably formed of plates of insulating material, the chute opening downwardly into the oil body at 34.
  • the chute preferably extends within the explosion chamber so that the movable contact is drawn between the side-extensions of the chute. Accordingly, the arc drawn is within or at the entrance 33 ofthe chute and is confined within the path of oil iiow as indicated so that it is swept in a denite direction by the oil blast from the explosion chamber. It will be apparent, of course. that the expulsion chute may exhaust directly outwards from the explosion chamber. Where, however, the breaker tank wall is close to the explosion chamber downward venting of the expulsion chutevmay be preferred.
  • a single pole electric circuit interrupter comprising an insulating casing forming a substantially undivided pressure confining chamber containing oil, the width of said chamber corresponding approximately to its length, a xed contact disposed in said chamber and a coacting contact movable in said chamber for opening the circuit at said fixed contact, said casing having an exhaust port located adjacent to and at one side of the path of the arc drawn by said movable contact, the size of said arc chamber bearing such relation to said arc path andto said exhaust port respectively that said arc is appreciably spaced from thewalls of said casing, and the arc pressure generated Within said casing causes expulsion of oil at high velocity through said exhaust port for interrupting the arc at that point.
  • a single pole electric circuit interrupter comprising an insulating pot forming a substantially undivided pressure conning chamber containing oil, the width of said chamber corresponding approximately to its length, a xed contact disposed at one end of said chamber and a coacting rod contact movable along a path eccentric with respect to the longitudinal axis oi' said pot for opening the circuit at said xed contact, said pot having an exhaust port located adjacent and transversely of said arc path, the size of said arc chamber bearing such relation to said arc path and to said exhaust port respectively that said arc is appreciably spaced from the walls of said pot, and the arc pressure generated within said pot causes expulsion of oil at high velocity through said exhaust port for interrupting the arc at that point.
  • a single pole electric circuit interrupter comprising an insulating pot forming a substantially undivided pressure confining chamber containing oil, the width of said chamber corresponding approximately to its length, a xed contact disposed within said chamber and a coacting contact movable ln said chamber for opening the circuit at said xed contact, said pot having an exhaust port located substantially transversely of the path of movement of said movable contact adjacent the point of initial separation of said contacts and initial formation of the arc, the size of said arc chamber bearing such relation to said path and to said exhaust port respectively that the arc is 'appreciably spaced from the walls of said pot and the arc pressure generated within said pot by said initial arcing causes, expulsion of oil at high velocity through said exhaust port for interrupting the arc at that point.
  • a single pole electric circuit interrupter comprising an insulating pot forming a pressure confining chamber containing oil, a fixed contact disposed in said chamber and a coacting contact movable through said chamber for opening the circuit at said xed contact, said pot having an exhaust port located at one side of the path of the arc drawn by said movable contact, and means forming an arc chute in said chamber communicating with said port including spaced insulating members between which said arc is drawn, the size of said arc chamber bearing such relation to said exhaust port that the arc pressure generated within said pot causes expulsion of oil at high velocity through said chute and exhaust port for interrupting the arc within said chute.

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  • Circuit Breakers (AREA)
US758925A 1934-12-24 1934-12-24 Electric circuit interupter Expired - Lifetime US2092652A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE413029D BE413029A (es) 1934-12-24
US758925A US2092652A (en) 1934-12-24 1934-12-24 Electric circuit interupter
FR799837D FR799837A (fr) 1934-12-24 1935-12-24 Interrupteur pour circuits électriques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US758925A US2092652A (en) 1934-12-24 1934-12-24 Electric circuit interupter

Publications (1)

Publication Number Publication Date
US2092652A true US2092652A (en) 1937-09-07

Family

ID=25053674

Family Applications (1)

Application Number Title Priority Date Filing Date
US758925A Expired - Lifetime US2092652A (en) 1934-12-24 1934-12-24 Electric circuit interupter

Country Status (3)

Country Link
US (1) US2092652A (es)
BE (1) BE413029A (es)
FR (1) FR799837A (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3327083A (en) * 1964-12-07 1967-06-20 Allis Chalmers Mfg Co Multi-chambered arc interrupter having fluid pump
US20140125323A1 (en) * 2011-06-17 2014-05-08 Roland Tombers Electrical Connection Module With Interruptible Circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3327083A (en) * 1964-12-07 1967-06-20 Allis Chalmers Mfg Co Multi-chambered arc interrupter having fluid pump
US20140125323A1 (en) * 2011-06-17 2014-05-08 Roland Tombers Electrical Connection Module With Interruptible Circuit
US9170277B2 (en) * 2011-06-17 2015-10-27 Phoenix Contact GMBH + Co. Kg Electrical connection module with interruptible circuit

Also Published As

Publication number Publication date
BE413029A (es)
FR799837A (fr) 1936-06-20

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