US2822448A - Air-break circuit breaker - Google Patents
Air-break circuit breaker Download PDFInfo
- Publication number
- US2822448A US2822448A US475697A US47569754A US2822448A US 2822448 A US2822448 A US 2822448A US 475697 A US475697 A US 475697A US 47569754 A US47569754 A US 47569754A US 2822448 A US2822448 A US 2822448A
- Authority
- US
- United States
- Prior art keywords
- arc
- resin
- air
- layer
- 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
Links
Images
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
- D01H1/14—Details
- D01H1/42—Guards or protectors for yarns or threads, e.g. separator plates, anti-ballooning devices
- D01H1/425—Anti-ballooning rings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/40—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes epoxy resins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
Description
Feb. 4, 1958 R. WEGMANN 2,822,448
AIR-BREAK CIRCUIT BREAKER Filed Dec. 16, 1954 5a nEs//v F164- RESIN co/vTA//v/NG SELF HARDEN/NG RESIN INVENTOR l 00A/'PSE RUT/LE ATTORNEYS ROBERT wfsMa/v/g` United States Patent Office AIR-BREAK CIRCUIT BREAKER Robert Wegmann, Wettingen, Switzerland, assignor to Aktiengesellschaft Brown, Boveri & Cie, Baden, Switzerland, a joint-stock company Application December 16, 1954, Serial No. 475,697
Claims priority, application Switzerland December 18, 1953 2 Claims. (Cl. 200-144) This invention relates to air-break circuit breakers with arc-suppressing chambers and more particularly to the composition of the walls of the arc-suppressing chamber.
It is known to employ synthetic resins having a quartz powder or glass liber filling as the walls of arc-suppressing chambers in duid-containing circuit breakers but such materials are destroyed relatively quickly when used as the walls of arc-suppressing chambers in air-break circuit breakers. Experience has shown that walls consisting mainly of organic substances can not sustain the high arc temperatures.
An object of the invention is to provide air-break circuit breakers, particularly automatic circuit breakers having a blast coil, with arc-suppressing chambers having walls formed of a hardenable resin containing a refractory oxide which protects the resin against destruction by the arc temperature. More speciiically, an object is to provide a circuit breaker of the type stated in which the resin walls of the arc-suppressing chamber are lled with rutile in an amount, by weight, which is a multiple of the resin content of the wall.
These and other objects and the advantages of the nvention will be apparent from the following specication when taken with the accompanying drawing in which:
Fig. 1 is a longitudinal section through a circuit breaker embodying the invention;
Fig. 2 is a transverse section on line 2 2 of Fig. 1;
Fig. 3 is a schematic diagram illustrative of a process for forming a wall of the arc-suppressing chamber; and
Fig. 4 is an edge elevation of another form of wall for the arc-suppressing chamber.
In Fig. 1, the reference numerals 1, 2 identify the contacts of an air-break circuit breaker which are separated by automatically operating mechanism of any known type in the event of an overload or a fault on the line. The contacts open adjacent the mouth of an arc-suppressing chamber 3 into which the arc is deected by a coil 4 in the usual manner.
The chamber 3 may be of any known form and usually will have an open top covered by a screen 3' but, in accordance with the invention, the arc-contacted surfaces of the chamber walls are provided by a layer 5 of a casting or self-hardening resin, for example a low-pressure casting resin of ethoxylin type such as that known as Araldit, with a iilling of rutile, Ti02, in a proportion by weight of about 6:1 of the resin. This relatively large proportion of inorganic filler prevents the combustion of the resin even in the case of a formation of soot on the walls of the arc-suppressing chamber.
It is preferable to employ several grain sizes of the filling compound in forming the wall material. One con- 2,822,448 Patented F eb. 4, 1958 mold 6 of the desired wall shape with coarse rutile fragments 7 of varying size and then to ll the interstices with a mixture of hardenable plastic and powdered rutile.
The walls of the arc-suppressing chamber need not necessarily consist entirely of a hardenable plastic with a rutile tilling as it is possible to build up the wall material by rst forming a relatively thin layer of rutile filled resin and then to cast on at least one additional layer 5a consisting of a hardenable resin and some other iilling material, for example quartz powder, SiO2, until the desired wall thickness is attained. Other filling materials such as aluminum oxide, A1203, or magnesia, MgO, may be employed in such additional layers. Such multilayer walls have the great advantage that the layer of resin and rutile which is contacted by the arc has favorable dielectric and thermal characteristics while the additional layer or layers have a much greater mechanical stability and electric breakdown resistance than the iirst layer.
As shown in Fig. 4, multi-layer plates for the manufacture of rectangular arc-suppressing chambers may be built up with a layer 5 containing rutile and a superposed layer 5a comprising a resin with a iilling of silica, aluminum oxide or magnesia.
The arc-blasting coil 4 and its leads can easily be incorporated in the walls of the arc-suppressing chamber, Yreferably in the outer layer 5a comprising the resin and powdered quartz or the like when a multi-layer wall is employed. The metal strips 8 which are usually incorporated in arc-suppressing chambers may, if desired, be supported by embedding edges thereof in the inner resin-rutile layer.
I claim:
l. A sparking chamber for electrical switches of the air-break circuit breaker type having blast coils, the walls of said chamber being of a multi-layer construction comprising an inner layer consisting of coarse lumps of rutile and a mixture of self-hardening resin of the ethoxylin type and powdered rutile lling the interstices between said lumps of rutile, and a second layer cast upon said iirst layer, said second layer consisting of a selfhardening resin of the ethoxylin type and a refractory oxide iiller selected from the group consisting of aluminum oxide, quartz and magnesia.
2. A sparking chamber as dened in claim 1 wherein the proportion of iilling material by weight to the resin in said inner wall is approximately 6:1.
References Cited in the le of this patent UNITED STATES PATENTS (Addition to French No. 981,678, I an. 11, 1949) OTHER REFERENCES British Plastics publication, November 1948 (pages venient method, as illustrated in Fig. 3. is to ll a hollow 55 521-523).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH2822448X | 1953-12-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2822448A true US2822448A (en) | 1958-02-04 |
Family
ID=4572042
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US475697A Expired - Lifetime US2822448A (en) | 1953-12-18 | 1954-12-16 | Air-break circuit breaker |
Country Status (4)
Country | Link |
---|---|
US (1) | US2822448A (en) |
BE (1) | BE534130A (en) |
CH (1) | CH316524A (en) |
FR (1) | FR1116031A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2987482A (en) * | 1959-06-30 | 1961-06-06 | Republic Aviat Corp | Method for making a solid dielectric |
US3472982A (en) * | 1966-07-29 | 1969-10-14 | Square D Co | Arc chute |
US4082931A (en) * | 1976-04-12 | 1978-04-04 | Westinghouse Electric Corporation | Arc chute |
US5691402A (en) * | 1996-09-13 | 1997-11-25 | Composite Technology Group, Llc | Composite tooling material having vinyl ester resins and fillers |
US6309587B1 (en) | 1999-08-13 | 2001-10-30 | Jeffrey L. Gniatczyk | Composite molding tools and parts and processes of forming molding tools |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010026512B3 (en) * | 2010-07-08 | 2011-12-01 | Abb Ag | Installation switching device e.g. motor circuit breaker, has housing comprising material e.g. spray-coated fiberglass fabric, in region, where material has high temperature resistance than another material of housing |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1431961A (en) * | 1918-07-25 | 1922-10-17 | Westinghouse Electric & Mfg Co | Arc shield |
US1878959A (en) * | 1928-09-27 | 1932-09-20 | Westinghouse Electric & Mfg Co | Circuit interrupter |
US2165819A (en) * | 1934-06-05 | 1939-07-11 | Steatit Magnesia Ag | Electric insulator and method of making same |
US2322353A (en) * | 1939-11-04 | 1943-06-22 | Western Electric Co | Dielectric material |
US2386659A (en) * | 1941-11-08 | 1945-10-09 | Gen Electric | Dielectric material |
US2439674A (en) * | 1944-10-17 | 1948-04-13 | Gen Electric | Current limiting fuse |
FR981678A (en) * | 1949-01-10 | 1951-05-29 | Improvement in spark plugs | |
US2645693A (en) * | 1949-09-13 | 1953-07-14 | Fed Electric Prod Co | Molded casing for electrical apparatus |
US2656442A (en) * | 1950-11-13 | 1953-10-20 | Allen Bradley Co | Arc extinguishing electrical switch apparatus |
FR59145E (en) * | 1944-08-04 | 1954-04-23 | Merlin Gerin | Improvements to circuit breakers and contactors blowing chambers |
US2707177A (en) * | 1952-11-29 | 1955-04-26 | Gen Electric | Ethoxyline-triallyl cyanurate resinous compositions |
-
0
- BE BE534130D patent/BE534130A/xx unknown
-
1953
- 1953-12-18 CH CH316524D patent/CH316524A/en unknown
-
1954
- 1954-12-16 US US475697A patent/US2822448A/en not_active Expired - Lifetime
- 1954-12-17 FR FR1116031D patent/FR1116031A/en not_active Expired
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1431961A (en) * | 1918-07-25 | 1922-10-17 | Westinghouse Electric & Mfg Co | Arc shield |
US1878959A (en) * | 1928-09-27 | 1932-09-20 | Westinghouse Electric & Mfg Co | Circuit interrupter |
US2165819A (en) * | 1934-06-05 | 1939-07-11 | Steatit Magnesia Ag | Electric insulator and method of making same |
US2322353A (en) * | 1939-11-04 | 1943-06-22 | Western Electric Co | Dielectric material |
US2386659A (en) * | 1941-11-08 | 1945-10-09 | Gen Electric | Dielectric material |
FR59145E (en) * | 1944-08-04 | 1954-04-23 | Merlin Gerin | Improvements to circuit breakers and contactors blowing chambers |
US2439674A (en) * | 1944-10-17 | 1948-04-13 | Gen Electric | Current limiting fuse |
FR981678A (en) * | 1949-01-10 | 1951-05-29 | Improvement in spark plugs | |
US2645693A (en) * | 1949-09-13 | 1953-07-14 | Fed Electric Prod Co | Molded casing for electrical apparatus |
US2656442A (en) * | 1950-11-13 | 1953-10-20 | Allen Bradley Co | Arc extinguishing electrical switch apparatus |
US2707177A (en) * | 1952-11-29 | 1955-04-26 | Gen Electric | Ethoxyline-triallyl cyanurate resinous compositions |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2987482A (en) * | 1959-06-30 | 1961-06-06 | Republic Aviat Corp | Method for making a solid dielectric |
US3472982A (en) * | 1966-07-29 | 1969-10-14 | Square D Co | Arc chute |
US4082931A (en) * | 1976-04-12 | 1978-04-04 | Westinghouse Electric Corporation | Arc chute |
US5691402A (en) * | 1996-09-13 | 1997-11-25 | Composite Technology Group, Llc | Composite tooling material having vinyl ester resins and fillers |
US6309587B1 (en) | 1999-08-13 | 2001-10-30 | Jeffrey L. Gniatczyk | Composite molding tools and parts and processes of forming molding tools |
Also Published As
Publication number | Publication date |
---|---|
CH316524A (en) | 1956-10-15 |
BE534130A (en) | |
FR1116031A (en) | 1956-05-03 |
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