US2330820A - Electric circuit breaker with compressed fluid blowout - Google Patents
Electric circuit breaker with compressed fluid blowout Download PDFInfo
- Publication number
- US2330820A US2330820A US287348A US28734839A US2330820A US 2330820 A US2330820 A US 2330820A US 287348 A US287348 A US 287348A US 28734839 A US28734839 A US 28734839A US 2330820 A US2330820 A US 2330820A
- Authority
- US
- United States
- Prior art keywords
- arc
- contacts
- auxiliary
- contact
- principal
- 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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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
- H01H33/98—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being initiated by an auxiliary arc or a section of the arc, without any moving parts for producing or increasing the flow
Definitions
- This invention relates to electric circuitbreakers and more particularly to those which themselves supply the energy required for blowing the arc.
- Circuit-breakers which themselves supply the energy required for blowing the arc generally comprise means for storing up potential energy during the operation of closing the contacts and then deliver said energy on separation of the contacts to impart to the fluid for blowing the arc a certain degree of pressure. Compressed air is generally used to blow the arc.
- the potential energy referred to is predetermined for a given type of apparatus. When the intensities of the short circuit currents to be broken exceed a certain value, the type of circuit-breaker referred to can no longer be used, as it then becomes necessary to supply supplementary energy from a source outside or apart from the circuitbreaker.
- One of the objects of the present invention is to provide an electric circuit-breaker with compressed fluid blow out and which supplies its own energy for blowing the arc, in which the rupturing power is increased.
- the circuit-breaker in accordance with the invention contemplates the production by said circuitbreaker of a supplementary quantity of energy over and above a given intensity of current which passes through the arc at break, said supplementary quantity of energy being supplied from a different source from the latter for effecting the blow out.
- the two quantities of energy referred to may act simultaneously or else said supplementary energy acts first and produces a preponderating blast, the blast produced by the other quantity of energy not beginning to act until some time after said former quantity.
- Fig. 1 shows an illustrative embodiment of the invention
- Fig. 2 is a longitudinal section of that part of the circuit-breaker containing the fixed contact and the two auxiliary contacts, and illustrates, upon a larger scale, the means for obtaining a concentric ow of the air currents;
- Fig. 3 illustrates certain modications of the apparatus shown in Fig. 1;
- Figs. 5, 6, 7 show the cam 3 in three principal positions.
- a circuit-breaker of the general type described comprising an air compressor having a piston operated by a. spring and tensioned before the closing of the contacts of said circuit-breaker, said spring being capable of Storing up in advance the energy required for the closing and separating of said contacts as well as the energy required to produce the compressed air required for blowing the arc.
- the compressor piston l is connected on the one hand to the free end of a powerful spring 2 and on the other hand to a cam 3 which is operated by mechanism herein shown in perspective for the sake of elearness.
- a shaft 4 of this mechanism is directed perpendicularly to the plane of said figure and its projection is shown at 4 which designates the axis of oscillation of the cam, which is moved by said mechanism in a contra-clockwise direction.
- a roller 5 upon one arm of a bell crank lever 6 which controls the main movable contact 1 of the circuit-breaker, the fixed contact of which is indicated by 8.
- Said circuit-breaker is further provided with an auxiliary fixed contact lll and an auxiliary movable contact Il which, when the intensity of the current to be broken exceeds a given value, draw an arc herein called the auxiliary are and designated by I2 and which is struck in series with the main arc (or principal arc).
- the auxiliary movable contact li is operated by a bell crank lever i3 against the action of a spring I4 which tends to keep the auxiliary contacts IB and II separated.
- a spring I4 which tends to keep the auxiliary contacts IB and II separated.
- an inclined plane 24 is moved to act upon a roller 25v carried-by a bell crank lever 25 and thus through a suitable connection swinging said bell crank lever I3 contraclockwise about a iulcrum to close the auxiliary contacts I0, II, said lever I3 engaging said bell crank lever I5.
- Closing movement of the principal contacts 'i and 3 of the circuit-breaker is effected by sending an energizing current through the winding 23 which causes the movable core of the latter to swing the bell crank lever 22 about its fulcrum thus freeing the pawl 2i.
- Said'shaft 4 l is thus unlocked, and under the' action of said spring 2, said cam 2 isv rotated counter clockwise and rotatesl said shaft il.
- supplementary energy for the blast is borrowed from the auxiliary arc.
- contacts Iii and II are located within a chamber 3i preferably separated from the chamber 3B containing the principal fixed contact as above set forth.
- the gases generated by said auxiliary arc i2 as well as the air within said chamber 3l the pressure of which is increased to a very high degree by the heat generated by said auxiliary arc, are blown against the principal arc 9, either directly or after contacting with a name shield 32 by which they are cooled, the blast thus furnished being of an intensity proportionate to the intensity of the current to be interrupted.
- auxiliary arc I2 forms before the principal arc when the intensity of the current to be interrupted exceeds a certain intensity value.
- Yend means are provided herein comprising a relay i6 which operates instantaneously but cnly when said intensity value is exceeded, the coil 28 for separating the contacts being supplied with current by a relay 33 the operation or" which is retarded.
- the invention contemplates the use of any suitable arrangement to produce the concentric flow of said two compressed air currents.
- this result may be obtained by using a principal iixed contact which is hollow and the hollow interior of which communicates with the compressor cylinder as shown in Fig. 2.
- This gure is a longitudinal section of that part of the circuitbreaker containing the principal xed Contact the two auxiliary contacts the remainder of said circuit-breaker having the same arrangement as that shown in Fig. 1.
- a channel 35 leads from an insulator 29 and conducts the air propelled by piston I into the interior space 36 of said mainixed contact 8.
- the interior chamber of the hollow xed principal contact may communicate with the chamber in which the auxiliary arc is formed.
- Fig. 3 As in the ⁇ case of Fig. 2 so also in the case of Fig. 3, only that part of the circuit-breaker containing the principal fixed Contact and said auxiliary contact is illustrated, the remainder of said circuitbreaker being of the same construction as that shown in Fig. l.
- the principal and auxiliary contacts as well as the arcs struck thereby are indicated in said Figs. 2 and 3 by the same reference characters as in Fig. 1.
- the interior chamber of the hollow fixed contact 8 communicates with the chamber 3
- a certain degree of simultaneous action of the two compressed air currents referred to may be obtained by directing said currents in opposite directions against said arc 9 'as shown illustratively in Fig. 4.
- the compressed air heated by the auxiliary arc is conducted to the fixed contact 8, while the air driven by the piston I is conducted through said hollow insulator Z9 into a cylinder 40 in which said movable contact 'I operates.
- the gases and the compressed air produced by the arc I2 are directed against that point of attachment of the arc 9 which is within the chamber 4I while the blast of compressed air from the piston I is conducted through openings or ports provided in a partition 42 and into a pipe 43 surrounding the movable contact, whence it directed against the other point of attachment of said arc 9.
- the energy for the blast generated by said auxiliary arc and that produced by the compressor may act successively.
- the blast generated by said auxiliary arc which always preponderates, starts rst and operates alone.
- the blast from the compressor starts to operate later and adds its operation to that generated by said arc; it scours the space separating and surrounding the contacts 'and completes the blowing of the arc, thus precluding any restriking of the latter.
- Any one of the farms of circuit-breakers above described. may be provided with a resistance serving to delay the re-establishment of the tension. Said resistance may be applied either mechanically or pneumatically and will preferably shunt the 'auxiliary arc and, the case arising, the principal arc.
- a capacity may be substituted for said resistance in all the circuit-breakers of the latter type and said capacity may be rendered operative either mechanically or pneumatically and will preferably shunt the auxiliary arc and the case arising the principal arc.
- the compressed air blast produced by the compressor cylinder may not only act simultaneously with that supplied from the chamber in which the auxiliary arc is struck but may also act after the arc has been extinguished. This has the advantage that the space about the contacts is efficiently and thoroughly scoured, any restriking of the arc being thus precluded. This operation takes place automatically in the majority of the apparatus above described, by causing the principal contacts and the auxiliary contacts to move at a suitable regulated speed and by making the compressor plant of suitable dimensions.
- Electric circuit breaker with compressed fluid blow out comprising, in combination, relatively movable main arc-drawing contacts; relatively movable auxiliary arc-drawing contacts mounted in series with said main arc-drawing contacts; a chamber for said main arc-drawing contacts; a separate chamber for said auxiliary aro-drawing contacts; mechanism for opening and for closing said main arc-drawing contacts; mechanism for opening and for closing said auxiliary arc-drawing contacts; fluid compressing mechanism operatively connected tothe arc-drawing contact closing mechanism; means for rendering said auxiliary arc-drawing Contact opening mechanism operative to open said contacts only when and after the current to be cut reaches a certain intensity, and before the main contacts are opened; means to direct a blast of compressed fluid against the main arc from said fluid compressing mechanism; and means to direct a blast of compressed iluid against said main arc 'from the chamber of said auxiliary arc.
- Electric circuit breaker with compressed fluid blow out comprising, in combination, relatively movable main arc-drawing contacts; relatively movable auxiliary arc-drawing contacts mounted in series with said main arc-drawing contacts; a chamber for said main arc-drawing contacts; a separate chamber for said auxiliary arc-drawing contacts; mechanism for opening and for closing said main arc-drawing contacts; mechanism for opening and for closing said auxiliary arc-drawing contacts; fluid compressing mechanism, including a piston operatively connected to the arc-drawing contact closing mechanism;
- Electricv circuit breaker with compressed iiuid blow out comprising, in combination, a fixed main arc-drawing Contact; a chamber containing said Contact; an inclosure for said chamber, terminating in an exhaust mouth-piece for the compressed duid blast; a movable main arcdraWing contact adapted to be Withdrawn out- Wardly from said chamber and said inclosure to draw an are; relatively movable auxiliary arcdrawing contacts mounted in series with said main arc-drawing contacts in a second chamber near that containing said fixed main arc-drawing contact; mechanism for opening and for closingsaid main arc-drawing contacts; mechanism for opening and for closing said auxiliary arc-drawing contacts; a cylinder provided with a piston to provide compressed fluid Within the circuit breaker, said piston being operatively connected to said arc-drawing contact closing mechanism; means for rendering said auxiliary arcdrawing contact opening mechanism operative ⁇ to open said auxiliary contacts only when and after the current to be cut reaches a certain intensity, and before the
- Electric circuit breaker With compressed fluid blow out comprising, in combination, a iixed main arc-drawing contact; a chamber adapted to contain said contact and terminating in an exhaust mouth-piece for the compressed uid blast; -a movable main arc-drawing contact adapted to be withdrawn outwardly from said mouth-piece; a tube mounted opposite said mouth-piece and in alignment therewith to receive said movable contact when it is Withdrawn I from said mouth-piece; relatively movable auxiliary arc-drawing contacts mounted in series with said main arc-drawing contacts, in a cham, bei ⁇ near that containing said fixed main arcdrawing contact; mechanism for opening and for closing said main arc-drawing contacts; mechanism for closing said auxiliary arc-drawing contacts; a cylinder containing a piston to furnish compressed duid in the circuit breaker, said piston being operatively connected to the arc-drawing contact closing mechanism; means adapted to open said auxiliary arc-drawing contacts only when and after the
- Electric circuit breaker with compressed fluid blow out comprising, in combination, relatively movable main arc-drawing contacts; a chamber containing said contacts; auxiliary arcdrawing contacts mounted in a chamber separate from that containing said main arc-drawing contacts and in series With the latter; mechanism for closing said main arc-drawing contacts and said auxiliary arc-drawing contacts, the mechanism for closing said main arc-drawing contacts including a cam for closing the latter; mechanism for opening said main arc-drawing contacts and for opening said auxiliary arc-drawing contacts; a cylinder and piston to provide compressed duid in the circuit breaker, said piston being operatively connected to the arc-drawing contact closing mechanism, the piston rod being connected to the mechanism for closing said auxiliary arc-drawing contacts; an electric relay to render said auxiliary arc-drawing contact opening mechanism operative to open said aiuriliary contacts only when and after the current to be cut reaches a certain intensity and before said main arc-drawing contacts are opened; means to direct a blast of
Landscapes
- Circuit Breakers (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE218205X | 1938-07-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2330820A true US2330820A (en) | 1943-10-05 |
Family
ID=5831173
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US287348A Expired - Lifetime US2330820A (en) | 1938-07-30 | 1939-07-29 | Electric circuit breaker with compressed fluid blowout |
Country Status (4)
Country | Link |
---|---|
US (1) | US2330820A (fr) |
BE (1) | BE435718A (fr) |
CH (1) | CH218205A (fr) |
FR (1) | FR858497A (fr) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2660647A (en) * | 1950-05-18 | 1953-11-24 | Westinghouse Electric Corp | Circuit interrupter |
US2734971A (en) * | 1952-09-04 | 1956-02-14 | Circuit interrupters | |
US2816993A (en) * | 1953-10-06 | 1957-12-17 | Allis Chalmers Mfg Co | Circuit breaker having switch arm mounted on fluid conducting bearing |
US2943168A (en) * | 1957-09-16 | 1960-06-28 | Fed Pacific Electric Co | Circuit breakers |
US3458676A (en) * | 1965-10-22 | 1969-07-29 | Westinghouse Electric Corp | Circuit interrupter of the gaseous puffer-type having series high-current explosion chamber with series-connected activated carbon therein |
US4973806A (en) * | 1987-10-27 | 1990-11-27 | Bbc Brown Boveri Ag | Compressed-air breaker |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2349193C2 (de) * | 1973-08-04 | 1986-10-02 | Brown, Boveri & Cie Ag, 6800 Mannheim | Elektrischer Schalter |
DE2349263C2 (de) * | 1973-10-01 | 1982-08-26 | Brown, Boveri & Cie Ag, 6800 Mannheim | Elektrischer Druckgasschalter |
DE2404721A1 (de) * | 1974-02-01 | 1975-08-07 | Bbc Brown Boveri & Cie | Elektrischer schalter |
FR2373141A1 (fr) * | 1976-12-06 | 1978-06-30 | Cem Comp Electro Mec | Appareil electrique de coupure a haute tension, notamment un disjoncteur a autosoufflage de l'arc de coupure par un gaz |
DE3224778C2 (de) * | 1981-03-30 | 1986-06-05 | Ernst Prof. Dr.techn.habil. 1000 Berlin Slamecka | Elektrische Schaltkammer mit Hilfslichtbogen für einen autopneumatischen Druckgasschalter |
-
0
- BE BE435718D patent/BE435718A/xx unknown
-
1939
- 1939-07-28 CH CH218205D patent/CH218205A/fr unknown
- 1939-07-29 US US287348A patent/US2330820A/en not_active Expired - Lifetime
- 1939-07-29 FR FR858497D patent/FR858497A/fr not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2660647A (en) * | 1950-05-18 | 1953-11-24 | Westinghouse Electric Corp | Circuit interrupter |
US2734971A (en) * | 1952-09-04 | 1956-02-14 | Circuit interrupters | |
US2816993A (en) * | 1953-10-06 | 1957-12-17 | Allis Chalmers Mfg Co | Circuit breaker having switch arm mounted on fluid conducting bearing |
US2943168A (en) * | 1957-09-16 | 1960-06-28 | Fed Pacific Electric Co | Circuit breakers |
US3458676A (en) * | 1965-10-22 | 1969-07-29 | Westinghouse Electric Corp | Circuit interrupter of the gaseous puffer-type having series high-current explosion chamber with series-connected activated carbon therein |
US4973806A (en) * | 1987-10-27 | 1990-11-27 | Bbc Brown Boveri Ag | Compressed-air breaker |
Also Published As
Publication number | Publication date |
---|---|
FR858497A (fr) | 1940-11-26 |
BE435718A (fr) | |
CH218205A (fr) | 1941-11-30 |
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