US3742168A - Minimum-oil circuit breaker including movable contact rod with elastically deformable braking member for applying braking force thereto proportional to gas pressure generated in arc-quenching chamber - Google Patents

Minimum-oil circuit breaker including movable contact rod with elastically deformable braking member for applying braking force thereto proportional to gas pressure generated in arc-quenching chamber Download PDF

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Publication number
US3742168A
US3742168A US00172970A US3742168DA US3742168A US 3742168 A US3742168 A US 3742168A US 00172970 A US00172970 A US 00172970A US 3742168D A US3742168D A US 3742168DA US 3742168 A US3742168 A US 3742168A
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US
United States
Prior art keywords
contact rod
movable contact
gas pressure
quenching chamber
circuit breaker
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
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US00172970A
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English (en)
Inventor
W Latal
W Schneebeli
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 Switzerland
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Bbc Brown Boveri & Cie
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.)
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Publication date
Application filed by Bbc Brown Boveri & Cie filed Critical Bbc Brown Boveri & Cie
Application granted granted Critical
Publication of US3742168A publication Critical patent/US3742168A/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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/60—Mechanical arrangements for preventing or damping vibration or shock

Definitions

  • a circuit breaker of the minimum-oil type includes a chamber for quenching the arc drawn between a movable contact rod and a stationary contact as the two separate.
  • a softly elastic annular clamping member closely surrounds the movable contact rod and is deformed in a radially inward direction by the gas pressure to press against the movable contact rod and hence provide a braking action for the rod.
  • the radially inward deformation of the elastic clamping member is proportional to the gas pressure produced in the quenching chamber and hence provides a braking effect on the movable contact rod which desirably increases with an increase in gas pressure.
  • damping elements are fitted in the breaker operating mechanism.
  • This mechanism may be spring-powered or operated by hydraulic or pneumatic means.
  • the purpose of the damping elements is that the velocity of the contact rod on opening.
  • the purpose of the invention is to create an arrangement which does not exhibit the disadvantages and shortcomings of the known solutions.
  • this purpose is achieved by locating in the breaker housing a damping element which is responsive to pressure and acts as a brake on the movable contact rod.
  • the advantage of the invention is in particular that the damping element acts as a brake only in those cases where the contact rod movement is accelerated by increased pressure in the quenching chamber, and that in such cases the braking effect is proportional to the pressure in the quenching chamber, and hence to the force, resulting from this pressure, which causes the contact rod to accelerate.
  • the damping element is composed of an elastic material and is in the form of an annulus which closely surrounds the movable contact rod.
  • a relatively soft elastic material for example rubber, cork or various synthetic substances
  • the pressure occurring in the quenching chamber causes the annular damping element to deform press more, or less, firmly round the contact rod in accordance with the magnitude of the pressure produced in the quenching chamber, and so proportionately retard the contact rod movement.
  • a particular advantage of this arrangement is that, owing to the absence of damping devices in the operating mechanism which are active during every switching operation, the operating mechanism requires much less power and can therefore be made correspondingly lighter.
  • the advantages of the arrangement according to the invention are especially evident in the case of threepole circuit-breakers where, for example, elevated pressure occurs in the quenching chamber of only one pole, because braking takes place only in that pole where it is actually necessary because of the higher pressure in the quenching chamber. This arrangement makes possible a significant lowering of cost, a reduction in design expenditure and hence simplification of the circuit-breaker as a whole.
  • FIG. 1 is an axial longitudinal section through a circuit breaker of the minimum-oil type in which the'improved gas pressure responsive braking structure for the movable contact rod according to the invention has been incorporated;
  • FIG. 2 is a detail sectional view drawn to a larger scale illustrating the contact rod damping element itself.
  • FIG. 1 illustrates the housing 1 for the circuit breaker contacts which is made from a suitable insulation material.
  • a quenching chamber 2 closed at the top by a cover 3 in which an opening 4 is provided that serves as an outlet for the gases formed by the arc produced upon disengagement of the contacts and also for the quenching fluid.
  • a pair of spaced stationary contact members 5 supported upon a projection 5a of a lower contact body 5b which terminates in one end connection terminal 8 for the circuit breaker.
  • a movable contact rod 6 is located centrally within the housing and is arranged to be displaced longitudinally by a suitable actuating mechanism, in itself known, and which has accordingly not been illustrated, into and out of engagement with the stationary contact members 5.
  • the contact rod 6 passes through an upper contact body 9 the interior of which forms a gassettling chamber and which also contains a certain quantity of oil 10.
  • a vent hole 11 to atmosphere is provided at the upper end of settling chamber 9a.
  • contact members 7 Surrounding contact rod 6 and engaged with the surface thereof are contact members 7 which serve to electrically connect contact rod 6 through the upper contact body 9 to the other end terminal 8 of the circuit breaker.
  • a spacer sleeve 12 of insulating material is located on the inside wall of the breaker housing 1 between quenching chamber 2 and its cover 3, and a similar spacer sleeve is located between cover 3 and the contact body 9 in which the settling chamber 90 is formed.
  • the annular and relatively softly elastic damping member 13 made from rubber, or cork or other material having a similar elastic characteristic which closely surrounds contact rod 6 and provides a variable braking force for the latter in accordance with the gas pressure developed within the quenching chamber is positioned in cover 3.
  • the damping member 13 which has a conical configuration and is seated in a complementarily configured recess 3a in cover 3 is shown more clearly at larger scale in FIG. 2 in association with contact rod 6.
  • the left half of FIG. 2 depicts the response of the elastic damping member 13 under dynamic conditions, i.e. the deformation thereof in a radially inward direction by the gas pressure (indicated by the arrows) to press against the contact rod 6.
  • the right half of FIG. 2 shows the elastic damping member 13 under static conditions, i.e. no gas pressure from which it will be seen that the surface of contact rod 6 does not touch the wall of the central opening 13a in the damping member through which the rod passes.
  • damping element 13 could be located at some other position in circuitbreaker housing 1 and it could be of some other geometrical form, or of other elastic materials which deform to exert a braking effect on contact rod 6.
  • a circuit breaker of the minimum-oil type comprising a housing including a quenching chamber therein, a movable contact rod operable within said quenching chamber to engage and be disengaged from a stationary contact, and an annular elastic damping member closely surrounding said movable contact rod and which is deformable in a radially inward direction in response to a rise in gas pressure generated within said quenching chamber upon disengagement of said contact rod from said stationary contact to engage and apply a braking force to said contact rod which varies in accordance with the magnitude of the gas pressure.
  • a circuit breaker as defined in claim I wherein said quenching chamber includes a cover plate and wherein said damping member is supported by said cover plate at the opening therein through which said contact rod passes.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Circuit Breakers (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
US00172970A 1970-09-10 1971-08-19 Minimum-oil circuit breaker including movable contact rod with elastically deformable braking member for applying braking force thereto proportional to gas pressure generated in arc-quenching chamber Expired - Lifetime US3742168A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1347270A CH521011A (de) 1970-09-10 1970-09-10 Olarmer Leistungsschalter

Publications (1)

Publication Number Publication Date
US3742168A true US3742168A (en) 1973-06-26

Family

ID=4392731

Family Applications (1)

Application Number Title Priority Date Filing Date
US00172970A Expired - Lifetime US3742168A (en) 1970-09-10 1971-08-19 Minimum-oil circuit breaker including movable contact rod with elastically deformable braking member for applying braking force thereto proportional to gas pressure generated in arc-quenching chamber

Country Status (15)

Country Link
US (1) US3742168A (forum.php)
AT (1) AT308230B (forum.php)
AU (1) AU456609B2 (forum.php)
BE (1) BE772332A (forum.php)
BR (1) BR7105893D0 (forum.php)
CA (1) CA936199A (forum.php)
CH (1) CH521011A (forum.php)
DE (2) DE2049265A1 (forum.php)
ES (1) ES394893A1 (forum.php)
FR (1) FR2107418A5 (forum.php)
GB (1) GB1316380A (forum.php)
NL (1) NL7112340A (forum.php)
NO (1) NO131908C (forum.php)
PL (1) PL77828B1 (forum.php)
SE (1) SE380129B (forum.php)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2548280B1 (fr) * 1983-06-30 1987-08-07 Paris & Du Rhone Perfectionnements aux contacteurs de demarreur electrique dont l'axe est independant du noyau mobile
NO321080B1 (no) * 2004-11-04 2006-03-13 Bennex As Bryter for høy spenning og/eller strøm

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE472305C (de) * 1927-10-30 1929-02-26 Siemens Schuckertwerke Akt Ges Loeschkammer fuer Schalter
DE1298176B (de) * 1961-12-23 1969-06-26 Calor Emag Elektrizitaets Ag Elektrischer Schalter mit Lichtbogenloeschung durch eine Loeschmittelstroemung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE472305C (de) * 1927-10-30 1929-02-26 Siemens Schuckertwerke Akt Ges Loeschkammer fuer Schalter
DE1298176B (de) * 1961-12-23 1969-06-26 Calor Emag Elektrizitaets Ag Elektrischer Schalter mit Lichtbogenloeschung durch eine Loeschmittelstroemung

Also Published As

Publication number Publication date
AT308230B (de) 1973-06-25
BE772332A (fr) 1972-01-17
CA936199A (en) 1973-10-30
NO131908B (forum.php) 1975-05-12
DE2049265A1 (de) 1972-03-16
FR2107418A5 (forum.php) 1972-05-05
ES394893A1 (es) 1974-05-16
CH521011A (de) 1972-03-31
NO131908C (forum.php) 1975-08-20
AU456609B2 (en) 1974-12-19
AU3162671A (en) 1973-02-01
GB1316380A (en) 1973-05-09
BR7105893D0 (pt) 1973-03-29
SE380129B (forum.php) 1975-10-27
DE7037094U (de) 1971-08-19
PL77828B1 (forum.php) 1975-04-30
NL7112340A (forum.php) 1972-03-14

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