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US2769065A - Circuit interrupter - Google Patents

Circuit interrupter Download PDF

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Publication number
US2769065A
US2769065A US323009A US32300952A US2769065A US 2769065 A US2769065 A US 2769065A US 323009 A US323009 A US 323009A US 32300952 A US32300952 A US 32300952A US 2769065 A US2769065 A US 2769065A
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US
United States
Prior art keywords
arc
coils
blowout
coil
housing
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
US323009A
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English (en)
Inventor
Russell E Frink
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.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
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 BE524595D priority Critical patent/BE524595A/xx
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US323009A priority patent/US2769065A/en
Priority to JP2178953A priority patent/JPS303723B1/ja
Priority to FR1091104D priority patent/FR1091104A/fr
Application granted granted Critical
Publication of US2769065A publication Critical patent/US2769065A/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
    • 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
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet

Definitions

  • WITNESSES 717 f Russell E. Frink. q; ATTORN Oct. 30, 1956 R. E. FRINK CIRCUIT INTERRUPTER 5 Sheets-Sheet 2 Filed NOV. 28, 1952- Fig.2.
  • This invention relates generally to circuit interrupters, and, more specifically, to arc-extinguishing structures for magnetic circuit interrupters.
  • the general object of the present invention is to provide an improved circuit interrupter, in which improved and more effective arc-extinguishing action takes place.
  • Another object is to provide an improved mounting arrangement for the blowout coil of a circuit interrupter.
  • Still a further object is to provide improved bracing means for counteracting the terrific magnetic forces exerted in and around the magnetic blowout coils during the interruption of large fault currents.
  • Still a further object is to provide an improved circuit interrupter of the type in which the blowout coil is at a floating potential in the closed, and in the fully open circuit position of the interrupter, and which provides an improved connection for connecting the potential of the magnetic pole plates to the mid-potential point of the floating blowout coil.
  • Figure 1 is a side elevational view, partially in vertical section, of a circuit interrupter embodying the principles of my invention, and the contact structure being shown in the closed-circuit position;
  • Fig. 2 is a plan sectional view of the circuit interrupter of Fig. 1, taken along the line Il-II of Fig. 1;
  • Fig. 3 is a vertical sectional view taken along the line IHIlI of Fig. 1;
  • Fig. 4 is a fragmentary, vertical sectional view taken along the line IV-IV of Fig. 1;
  • Figs. 5 and 6 are side elevational and end views of a side magnetic pole plate utilized in my improved circuit interrupter
  • Figs. 7 and 8 are side elevational and end views of the thin insulating spacer required in my improved magnet construction
  • Fig. 9 is a side elevational view of a coil washer
  • Fig. 10 is an end view of my improved shading coil
  • Figs. 11 and 12 are respectively end and side elevational views of one of the transfer arcing horn.
  • the reference numeral 1 generally designates a circuit interrupter, in this instance being one of the air-break type.
  • a circuit interrupter in this instance being one of the air-break type.
  • the illustrated specific embodiment of my invention is an air-break type of circuit interrupter, it is to be clearly understood that certain features of my invention may be applicable to other types of circuit interrupters, say, for instance, one of the liquid-immersed type.
  • do 1 describe a specific embodiment which operates in air.
  • the circuit interrupter 1 includes-contact structure 2 operable to establish an arc, which is moved upwardly into an arc-chute structure 3, including a pair 2,769,065 Patented Oct. 30, 1956 of arc-extinguishing sections 4 and 5 of substantially identical construction.
  • one terminal L1 of the circuit interrupter is connected to the stationary contact 6 of my device, whereas the other terminal L2 of the interrupter is electrically connected to the movable contact 7 of the device.
  • suitable bridging and secondary contacts may be employed to relieve the stationary and movable arcing contacts 6, 7 from carrying the current in the fully-closed-circuit position, as shown in Fig. 1.
  • the movable arcing contact 7 moves away from the stationary arcing contact 6 to establish an are 8, as shown by the dot-dash line of Fig. 1.
  • This are, generally designated by the reference character 8 may be considered as composed of three sections 8a, 8b and 8c.
  • the are S bows upwardly because of the natural convection current of air, which is heated by the hot are 8, and also because of the magnetic forces set up by the are 8 which act to expand the loop of the arc, as well understood by those skilled in the art.
  • Adjacent the top portion of the are 8 is a pair of transfer arc horns 10, 11, between which is disposed a transfer arc-extinguishing means 13.
  • the arc portion 8a extends between the movable arcing contact 7 and the transfer arc horn 10.
  • the arc portion 8b extends within the transfer arc-extinguishing means 13 between the transfer are horns 1t) and 11.
  • the are portion extends between the stationary arcing contact 6 and the transfer are horn 11.
  • the function of the transfer arc-extinguishing means 13 is to interrupt the arc portion Sb, and so bring into series circuit the pair of serially-related centrally-disposed blowout coils 15 and 16, the location of which is more clearly shown in Fig. 2 of the drawings.
  • Such coils of course, have insulating windings.
  • the centrally-disposed blowout coils 15, 16 are connected in series circuit together, as by a bolt connection 17 (Fig. 3), and the other ends 18, 19 of blowout coils 16, 15, respectively, are secured to the transfer are horns 10, 11, respectively, as shown more clearly in Fig. l of the drawll'lgS.
  • the transfer arc-extinguishing means 13 is, therefore, desirable to assist in this transfer into series circuit of the blowout coils 15, 16, by extinguishing the arc portion 812.
  • the transfer arc-extinguishing means 13 includes a plurality of spaced slotted ceramic plates 20, the configuration of which is more clearly shown in Fig. 3 of the drawings. As shown, each ceramic plate 20 has a slot 21 provided therein, within which the arc portion 812 is moved. The spaced ceramic plates 20 are spaced laterally apart, as shown more clearly in Fig. 1, by pairs of sections of asbestos rope cemented between the plates 20 adjacent the outer edges thereof.
  • the blowout coils 15 and 16 are serially connected in the circuit, and the energization of these coils 15, 16 sets up a magnetic flux within the magnetic circuit 22, which includes a pair of side magnetic pole plates 24 having a configuration more clearly shown in Figs. 5 and 6 of the drawings.
  • the pole plates 24 are formed of vertically extending sheets of a suitable magnetic material to form a lami nated structure more clearly shown in Fig. 6 of the drawings.
  • Magnetically interconnecting the side pole plates 24 is a central interconnecting core portion 25, about which encircles the two serially-related blowout coils 15 and 16.
  • the H type of magnetic circuit 22 shown upon the energization thereof, causes magnetic flux to flow between the pole plates 24 in the manner indicated by the arrows 26 in Fig. 4.
  • This magnetic flux extending transversely between the pole plates 24 causes upward movement of the arc portions 8a, 8c upwardly into the arc-extinguishing sections 4, of the arc-chute structure 3.
  • the left-hand end of the arc portion 8a quickly transfers to an outer arc horn 28, the lower end of which is connected, as shown, to the movable arcing contact 7 and hence to the lower terminal L2 of the device.
  • the right-hand end of the arc portion 80 quickly transfers to the right-hand arc horn 29 of the device, which is electrically connected to the stationary contact 6 by the connection 12 and hence to the upper te minal L1 of the device.
  • each ceramic plate 30 has a slot 31 provided therein, the upper closed end 32 of which is slightly off-center.
  • the plates 30 are staggered during the assembly operations so as to form a horizontally-disposed zigzag arc passage 9 throughout the length of the arc-chute sections 4, 5 to quickly bring about extinction of the arc portions 6a, 80.
  • the plates 30 are spaced laterally apart, as shown more clearly in Fig. 1, by sections of asbestos rope 27 cemented between the plates 30 adjacent the outer edges thereof, the method being identical to that previously referred to in spacing the plates 20 of the transfer arc-extinguishing means 13 apart.
  • the particular design illustrated in the aforementioned application is rated at 50,000 kva. at 5 kv. and has a maximum current interrupting rating of 12,500 amperes.
  • the current passes through the blowout coils 15, 16, and the magnetic forces from these currents tend to deform the coils 15, 16 into a circular shape to enclose as great an area as possible, and also to pull the two coils together.
  • the rectangularlyshaped arc-chute jacket 34 encloses the arc-extinguishing sections 4, 5.
  • One feature of my present invention is to cut substantially rectangular apertures 35 in the side Walls of the arc-chute jacket 34, to accommodate the core 25 and also to accommodate the blowout coils 15, 16. These coils, a shown, are wound in the form of pancake coils disposed in the plane of the side walls of the arc chute jacket 34 of insulating material.
  • the wire from which the coils 15, 16 are made is of such a size that the coils 15, 16 replace the insulating material cut away in making the apertures 35.
  • coil washers 36 (Fig. 9) of insulating material, preferably glass melamine laminate. These coil washers 36 protect the coils 15, 16 from the arc and at the same time provide support against the forces tending to pull the two coils 15, 16 together.
  • the two blowout coils 15, 16, as mentioned, are connected in series by bolting the two top terminals together by the bolt 17 (Fig. 3).
  • the lower terminals of the coils 1'5, 16 are connected to the transfer arc-horns 10, 11.
  • the transfer are horns, 10, 11 form rigid spacers in compression between the coil washers 36, as shown more clearly in Fig. 2 of the drawings.
  • the coil washers 36 have notches 37 (Fig. 9), which accommodate projections 38 (Fig. 12) of the transfer arc-horns 10, 11. This vertically locates the transfer arc-horns 10, 11.
  • a shading coil 39 Formed about the magnetic core 25, and providing an additional spacer in compression between the coil washers 36 is a shading coil 39, preferably made of resistance bronze and shown more clearly in Fig. 10 of the drawings.
  • the upper terminals of the blowout coils 15, 16, are clamped by the bolt 17 between the open end of the shading coil 39, which completes the loop.
  • the shading coil 39 provides sidewise bracing between the coils 15, 16 by bearing against the coil Washers 36.
  • the shading coil 39 forms a terminal for connecting the two blowout coils 15, 16 in series at their upper terminals.
  • the construction described also provides larger venting spaces 33 for the emission of gases from the transfer stack 13 and better utilization of the magneto-motive force of the blowout coils than that previously disclosed in the aforesaid patent. The net result is a more effective arc-extinguishing structure 3 with greatly increased support for bracing the blowout coils 15 and 16 and making possible the interruption of heavier short-circuit currents.
  • a circuit interrupter including contact structure separable to establish an are, an arc chute having a housing in which the arc is extinguished, said housing having plate-like side walls with at least one side wall having an opening therein, one or more blowout coils to assist in moving the arc within the arc chute, and at least one of the blowout coils being braced from expanding radially in the plane of said one side wall by the edge of said opening.
  • a circuit interrupter including contact structure separable to establish an are, a substantially rectangularlyshaped arc chute having a substantially rectangularlyshaped housing having a pair of opposed openings in the side walls thereof, an H-shaped magnet structure having the core thereof extending through the two openings, a pair of pole plates on opposite sides of the housing and abutting the core, and a pair of blowout coils disposed within the openings and braced by the side walls of the housing.
  • a circuit interrupter of the magnetic blowout type wherein contacts separate to establish an arc and wherein a blowout coil is energized to effect movement of the are within an arc chute, characterized by the fact that an opening is provided in a plate-like wall of the arc chute within which said blowout coil is positioned, and said blowout coil being braced by the edge of said opening from expanding radially in the plane of said plate-like wall of the arc chute.
  • a circuit interrupter of the magnetic blowout type including means for establishing an are, a housing in which the arc is moved having an opening in a plate-like side wall thereof, one or more blowout coils to effect motion of the arc, and at least one of the blowout coils being braced by the edge of said opening from expanding radially in the plane of said side wall having the opening.
  • a circuit interrupter of the magnetic blowout type including means for establishing an arc, a housing in which the arc is moved having side walls with a pair of opposed openings, a pair of blowout coils to effect motion of the are within the housing, and the blowout coils being disposed within the openings to be braced by the walls of the housing.
  • a circuit interrupter including means for establishing an arc, a pair of blowout coils for effecting movement of the arc, a magnetic core threading the blowout coils, and a short-circuiting shading coil disposed about the core between the blowout coils and serving to brace the same apart.
  • a circuit interrupter including means for establishing an are, a magnet structure for efiecting' movement of the are including a pair of serially-related blowout coils and a magnetic core threading the blowout coils, a U- shaped shading coil disposed about the core between the blowout coils, and the terminals of the coils being connected together at the open end of the shading coil to complete the loop of the shading coil.
  • a circuit interrupter including means for establishing an arc, a magnet structure for effecting movement of the are including a pair of serially-related blowout coils and a magnetic core threading the blowout coils, a U-shaped shading coil disposed about the core between the blowout coils, the terminals of the coils being connected together at the open end of the shading coil to complete the loop of the shading coil, and the shading coil serving to brace the coils apart.
  • a circuit interrupter including means for establishing an arc, a floating magnet structure including a pair of pole plates and a magnetic core, a pair of floating blowout coils about the core, a shading coil about the core and in electrical contact therewith, and means connecting the blowout coils with the shading coil to bring the potential of the magnet structure to that of the point between the coils.
  • a circuit interrupter including means for establishing an arc, an H-type magnet structure at a floating potential including a pair of pole plates and an interconnecting magnet core, a pair of serially related blowout coils at a floating potential about the core, a pair of transfer are horns connected to the ends of the coils, the other ends of the coils being connected together, and a shading coil about the core in electrical contact with both the magnet structure and with said other ends of the coils so that the potential of the magnet structure is that of the point between the coils.
  • a circuit interrupter including contact structure separable to establish an arc, an arc chute having a housing in which the arc is extinguished, said housing having side walls with an opening therein, one or more blowout coils to assist in moving the are within the arc chute, and at least one of the blowout coils being wound in the plane of the side wall and having a close fit within the opening thereby being braced by the walls of the housing.
  • a circuit interrupter including contact structure separable to establish an are, a substantially rectangularlyshaped arc chute having a substantially rectangularlyshaped housing having a pair of opposed openings in the side walls thereof, an H-shaped magnet structure having the core thereof extending through the two openings, a pair of pole plates on opposite sides of the housing and abutting the core, and a pair of blowout coils wound in the planes of the side walls and having close fits within the openings thereby being braced by the side walls of the housing.
  • a circuit interrupter of the magnetic blowout type wherein contacts separate to establish an arc and wherein a blowout coil is energized to effect movement of the are within an arc chute, characterized by the fact that an opening is provided in the wall of the arc chute and the blowout coil is wound in the plane of the wall of the arc chute whereby said blowout coil is braced by the wall of the arc chute.
  • a circuit interrupter of the magnetic blowout type including means for establishing an are, a housing in which the arc is moved having an opening in a side wall thereof, one or more blowout coils to effect motion of the arc, and at least one of the blowout coils being wound in the plane of the side wall and having a close fit within the opening whereby the coil is braced by the side wall of the housing.
  • a circuit interrupter of the magnetic blowout type including means for establishing an arc, a housing in which the arc is moved having side walls with a pair of opposed-openings, a pair of blowout coils to effect motion ofthe are within the housing, and the blowout coils being wound in the planes of the side walls of the housing and having close fits therein whereby the blowout coils are braced bytthe side walls of the housing.
  • a circuit interrupter including contact structure separable to establish an arc, an arc chute having a housing'in which the arc is extinguished, said housing having side walls with a pair of opposed openings therein, a pair of blowout coils to assist in moving the are within the arc chute, the pair of blowout coils being disposed within the openings of the housing and braced by the walls of the housing, a magnetic core threading the blowout coils, and a shading coil disposed about the core between the blowout coils and serving to brace the same apart.
  • a circuit interrupter including contact structure separable to establish an are, a substantially rectangularlyshaped arc chute having a substantially rectangularlyshaped housing having a pair of opposed openings in the side walls thereof, an H-shaped magnet structure having the core thereof extending through two openings, a pair of pole plates on opposite sides of the housing and abutting the core, a pair of blowout coils disposed within the openings and braced by the side walls of the housing, and a shading coil disposed about the core between the blowout coils and serving to brace the same apart.
  • a circuit interrupter including contact structure separable to establish an are, an arc chute having a housing in which the arc is extinguished, said housing having side walls with a pair of opposed openings therein, a pair of blowout coils to assist in moving the are within the arc chute, the pair of blowout coils being wound in the planes of the side walls of the housing and having close fits therein, a magnetic core threading the blowout coils, and a shading coil disposed about the core between the blowout coils and serving to brace the same apart.
  • a circuit interrupter including contact structure separable to establish an arc, a substantially rectangularlyshaped arc chute having a substantially rectangularlyshaped housing having a pair of opposed openings in the side walls thereof, an H-shaped magnet structure having the core thereof extending through the two openings, a pair of pole plates on opposite sides of the housing and abutting the core, a pair of blowout coils wound in the planes of the side walls of the housing and having close fits therein, and a shading coil disposed about the core between the blowout coils and serving to brace the same apart.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
US323009A 1952-11-28 1952-11-28 Circuit interrupter Expired - Lifetime US2769065A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE524595D BE524595A (hu) 1952-11-28
US323009A US2769065A (en) 1952-11-28 1952-11-28 Circuit interrupter
JP2178953A JPS303723B1 (hu) 1952-11-28 1953-11-27
FR1091104D FR1091104A (fr) 1952-11-28 1953-11-27 Interrupteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US323009A US2769065A (en) 1952-11-28 1952-11-28 Circuit interrupter

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US2769065A true US2769065A (en) 1956-10-30

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US323009A Expired - Lifetime US2769065A (en) 1952-11-28 1952-11-28 Circuit interrupter

Country Status (4)

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US (1) US2769065A (hu)
JP (1) JPS303723B1 (hu)
BE (1) BE524595A (hu)
FR (1) FR1091104A (hu)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3024331A (en) * 1957-11-06 1962-03-06 Westinghouse Electric Corp Circuit interrupter
US3538279A (en) * 1967-07-11 1970-11-03 Westinghouse Electric Corp Blowout magnet structure for air-break circuit interrupter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1713229A (en) * 1926-08-16 1929-05-14 Gen Electric Circuit interrupter
US2150564A (en) * 1935-09-28 1939-03-14 Trumbull Electric Mfg Co Circuit breaker

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1713229A (en) * 1926-08-16 1929-05-14 Gen Electric Circuit interrupter
US2150564A (en) * 1935-09-28 1939-03-14 Trumbull Electric Mfg Co Circuit breaker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3024331A (en) * 1957-11-06 1962-03-06 Westinghouse Electric Corp Circuit interrupter
US3538279A (en) * 1967-07-11 1970-11-03 Westinghouse Electric Corp Blowout magnet structure for air-break circuit interrupter

Also Published As

Publication number Publication date
BE524595A (hu)
FR1091104A (fr) 1955-04-07
JPS303723B1 (hu) 1955-05-31

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