US3483343A - Electric circuit breaker with special arc extinguishing structure - Google Patents

Electric circuit breaker with special arc extinguishing structure Download PDF

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Publication number
US3483343A
US3483343A US592442A US3483343DA US3483343A US 3483343 A US3483343 A US 3483343A US 592442 A US592442 A US 592442A US 3483343D A US3483343D A US 3483343DA US 3483343 A US3483343 A US 3483343A
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United States
Prior art keywords
conductors
arc
movable contact
circuit breaker
contacts
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Expired - Lifetime
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US592442A
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English (en)
Inventor
Eldon B Heft
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General Electric Co
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General Electric Co
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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
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2418—Electromagnetic mechanisms combined with an electrodynamic current limiting mechanism

Definitions

  • the arc is drawn by movement of a bridging contact member which is U-sha-ped, and the magnetic fields associated with the current in the aforesaid conductors also act on the bridging contact member to move it to open circuit position automatically.
  • My invention relates to electric circuit breakers, and more particularly to electric circuit breakers of the type including means for quickly creating an arc and elongating such are at such high speed as to produce a currentlimiting action.
  • the term current-limiting circuit breaker is used to refer to an electric circuit breaker having the ability to interrupt an electric current while the current is in a rising condition, and to do so in such a manner that the current is prevented from reaching a value equal of the value that it would have attained if the circuit breaker had remained in the circuit but had remained in closed condition, such current value being known as the prospective current value.
  • the maximum actual or peak letthrough current value is less than the maximum prospective current value.
  • an arc voltage is produced which is substantially greater than the voltage of the system, thereby over-riding the voltage tending to maintain the arc and quickly driving the current to zero.
  • An important requirement of a current-limiting circuit breaker is that the arc be created a very short time after the occurrence of the short-circuit condition. This requires that the movable contact commence movement in a very short time, and that it be accelerated at a very high rate. Not only must the are be created in an exceedingly short time after the interrupting signal is received, but in addition this are creation must immediately be followed by substantial arc elongation to produce substantial arc voltage to over-ride the driving voltage of the circuit. This means that the movable contact must not only commence its movement in extremely short time after the short-circuit condition occurs, but in addition it must be accelerated at an extremely high rate away from its normally closed position to elongate the initially developed arc.
  • operating means such as magnetic solenoids have been used to provide opening movement of movable contacts, and magnetic means have also been provided in the form of blow-out coils to motor arcs and to elongate them after their initial creation.
  • an electric circuit breaker of the type including a pair of spaced stationary contacts which are interconnected and bridged by a relatively movable contact.
  • the relatively movable contact member comprises a generally U-shaped rigid member having contact surfaces at the end portions of the legs of the U.
  • incoming and outgoing leads are brought to the spaced stationary contacts along paths which extend substantially parallel to the bight portion of the U of the movable contact member, and which are positioned substantially within the space between the aforesaid bight portion of the movable contact member and a line drawn between the aforesaid spaced stationary contacts.
  • the current paths through the aforesaid lead-in conductors extend substantially parallel to each other and in the same direction.
  • the current flowing between the stationary contacts via the bight portion of the U-shaped contact member flows in a direction opposite to the said direction.
  • the magnetic field associated with each of the aforesaid lead-in conductors acts with respect to the magnetic field associated with the arc current in such a way as to move the arc in the desired direction away from its initial path and to rapidly elongate the arc so as to increase the arc voltage.
  • FIGURE 1 is a side elevation view of an electric circuit breaker, shown partly in semi-schematic form, embodying the invention
  • FIGURE 2 is a side elevation view of a portion of the circuit breaker of FIGURE 1, portions of the leadin conductors being broken away to better show the interior of the arc chamber, the movable contact being shown in a partly-open position;
  • FIGURE 3 is a view similar to FIGURE 2, showing the movable contact member in fully open position;
  • FIGURE 4 is a perspective view of the stationary contacts with their associated arc runner portions, and the lead-in conductors and movable contact member, showing their configuration and general arrangement in accordance with the invention
  • FIGURE 5 is a schematic view showing the interrelation of the currents in the lead conductors and the movable contact member and their associated magnetic fields as they exist when the parts are in the position shown in FIGURES 1 and 2;
  • FIGURE 6 is a schematic view showing the interrelation of the currents in the lead conductors and in the arc, and their associated magnetic fields as they exist when the parts are in the position shown in FIGURE 3;
  • FIGURE 7 is a fragmentary side elevation View of another embodiment of the invention.
  • FIGURE 8 is a diagrammatic illustration showing portions of the current path through the circuit breaker of the invention during the interruption process.
  • FIGURE 1 the invention is shown as incorporated in an electric circuit breaker including a generally boxlike insulating casing comprising a base portion 10 and a cover portion 11.
  • a line terminal 12 is supported on the insulating base at one end thereof, and a load terminal 13 is supported on the insulating base at the opposite end thereof.
  • a pair of spaced generally planar stationary contacts 14 and 15 are supported Within the base 10 on angular portions 16, 17 respectively of elongated arc runner members 18 and 19 respectively.
  • the arc runner members 18 and 19 are supported in an arc extinguishing chamber enclosure 20 having a cover 21.
  • the inner side walls of the enclosure 20, particularly in the area of the stationary contacts 14 and 15, are preferably composed of an acetal resin material, such, for example as polyoxymethylene.
  • a material of the type described, for example, is that sold under the trade name of Celcon by the Celanese Plastic Company, Newark, NJ.
  • the enclosure 20 has a generally cup-shaped portion 20A at the side thereof opposite the arc runners 18 and 19.
  • the stationary contacts 14 and 15 are connected to the load and line terminals 13, 12 respectively by means including elongated lead conductors 23, 24.
  • the lead conductors in turn are connected to terminal conductor straps -26 respectively.
  • the conductor 26 connects the lead conductor 24 to the line terminal 12, while the conductors 25 and 28 connects the lead conductor 23 to the terminal 13.
  • the stationary contacts 14 and 15 are interconnected, when the circuit breaker is in the closed condition by a generally U-shaped movable contact member 30 comprising a generally U-shaped body portion including a bight portion 31 and parallel leg portions 32, 33, each of the leg portions 32, 33 carrying a movable contact 34, 35' at the end thereof, set at an angle thereto.
  • the movable contact member 30 moves between open and closed circuit positions within the cup-shaped portion 20A of the enclosure 20.
  • the current path through the circuit breaker in the closed condition as shown in FIGURE 1 is therefore as follows: from the line terminal 12 through the conductor 26 to the lead conductor 24, to the arm runner extension 19A to the stationary contact 15, to the movable contact 35, to the U-shaped movable contact member 30, to the movable contact 35, to the U-shaped movable contact member 30, to the movable contact 34, to the stationary contact 14, to the arc runner extension 18A, to the lead conductor 23, to the conductor 25, and thence through the conductor 28 to the load terminal 13.
  • the movable contact member 30 is also made manually movable.
  • a simplified operating mechanism has been illustrated comprising an operating link 42 pivotally supported on the pivot pin 43 in the insulating base 10.
  • the operating link 42 has an elongated slot 44 therein which serves to transmit motion to the operating rod by means of the pin 45 which extends into the slot 44.
  • the rod 40 is guided for straight-line movement by the opening in the housing 20A and by a bearing member 38.
  • the operating link 42 is adapted to be operated between positions corresponding to open and closed conditions of the movable contact by means of an overcenter tension type spring 50 having one end thereof connected to the pin 45 and the other end thereof connected to a manually operable handle member 52 which is supported for arcuate movement in track 53 in the casing, or by other suitable means.
  • FIGURE 2 it will be observed that when the movable contact member 30 is in the closed circuit condition and conducting current, the direction of current flow in the bight portion 31 of the movable contact member 30 is in the opposite direction from the direction of current flow in each of the lead conductors 23 and 24.
  • the relation of the currents in these conductors is therefore as illustrated diagrammatically in FIGURE 5.
  • the effect of magnetic fields associated with the current in each of the branches 23 and 24 is such as to repel the bight portion 31 of the movable contact 30.
  • this force becomes great enough to overcome the bias of the spring 50 holding the contacts in closed condition.
  • the movable contact member is thrown in the opening direction at extremely high speed, giving a current-limiting action. It will be observed that this contact-opening action will take place even though the operating handle is in the no position. Thus the lower end of the spring 50 will be moved to the right as viewed, causing clockwise movement of the handle.
  • a second important function of the conductors 23 and 24 has is that they assist the change, illustrated in FIG- URES 2 and 3, from two short arcs 55, 56 to a single long are 57. This is accomplished by the repelling action between the magnetic fields associated with the current in the conductors 23, 24, which at any given time is in a first direction, against the magnetic fields associated with the arcs 55, 56, which current is flowing in a generally opposite direction. Thus the arcs 5,5, 56 are urged to the left as viewed, by the magnetic field action.
  • FIGURE 3 the parts are shown in the position they occupy when the movable contact has moved to the full open position.
  • the two initially created arcs 55 and 56 have joined together to form a single are 57 extending directly between the arc runners 18 and 19.
  • the direction of current flow in the lead conductors 23 and 24 is opposite in sense to the direction of current flow through the arc 57.
  • This condition is illustrated diagrammatically in FIGURE 6.
  • the action of the magnetic fields associated with the currents in the conductors 23 and 24 at this time is then such as to repel the arc 57, which it does, moving the arc 57 out along the arc runners 18 and 19 and causing a very rapid current-limiting interruption.
  • the magnetic fields associated with the current in these conductors perform the following functions: (1) act to cause mechanical opening of the contacts at high speed and movement of the movable contact in opening direction, (2) act in a manner to elongate the initial two short arcs in a direction to cause them to impinge upon each other and form a single elongated arc and (3) act to move the single elongated are out along the arc runners in a direction opposite the contactopening direction.
  • the movable contact member 30' substantially directly interconnects the stationary contacts 14' and 15.
  • a separate device such as a separate solenoid, will be used to cause opening of the contacts upon the occurrence of short-circuit conditions.
  • a construction of the type referred to is shown, for example, in application Ser. No. 768,963 filed Oct. 10, 1968 by R. L. Hurtle and H. G. Willard and assigned to the same assignee as the present invention, said application being a continuation of application Ser. No.
  • each of the conductors 23, 24 is adjacent and connected to one of the contacts 14, 15, and the conductor extends away from that contact toward the other contact.
  • An electric circuit breaker comprising:
  • each of said conductors having one end thereof terminating adjacent and connected to a different one of said stationary contacts respectively and each of said conductors extending from said one stationary contact in the general direction of the other of said stationary contacts, whereby current passing through each of said conductors flows in the same general direction, and the current passing directly between said stationary contacts flows in the opposite direction whereby an arc extending directly between said stationary contacts is repelled by action of the magnetic fields associated with said conductors in a direction away from both of said electrical conductors.
  • circuit breaker as set forth in claim 1 wherein said circuit breaker also comprises a pair of diverging arc runners each electrically connected to one of said stationary contacts, said are runners extending in the direction in which said are is urged by said magnetic fields of said elongated conductors.
  • said movable contact bridging means comprises a pair of movable contacts and rigid supporting mearis supporting said movable contacts in fixed relation with respect to each other, said supporting portion including a straight-line portion extending substantially parallel to said line connecting said spaced stationary contacts and parallel to said elongated conductors.
  • said movable contact bridging means comprises a rigid generally U-shaped conductive member having a pair of contact members supported at the outer ends of said U, the bight portion of said U extending parallel to said elongated conductors when said movable contact bridging means is in said closed circuit position.
  • said bight portion of said U-shaped contact member extends at the opposite side of said elongated electrical conductors from said line interconnecting said pair of spaced stationary contacts, whereby said bight portion of said movable contact means is initially repelled in contact opening direction by the action of the magnetic fields associated with said conductors and whereby said single elongated arc is acted on by the action of the magnetic field associated with the current in each of the elongated conductors following the time when the current takes a path directly between said spaced stationary contacts.
  • An electric circuit breaker comprising: (a) a support; (b) a first generally planar stationary contact supported on said support; (0) a second generally planar stationary contact supported on said support in spaced relation to and at an oblique angle to said first stationary contact whereby said first and second stationary contacts converge toward each other in a first direction;
  • each of said conductors having one end thereof terminating adjacent and connected to a different one of said stationary contacts respectively, and each of said conductors extending from said one stationary contact in the general direction of the other of said stationary contacts whereby current passing through each of said conductors flows in the same general direction and the current passing between said stationary contacts directly flows in the opposite direction, whereby an are extending directly between said stationary contacts is repelled by action of the magnetic fields associated with said conductors in a direction away from both of said electrical conductors.
  • said movable contact means comprises a rigid generally U-shaped movable contact support member of conductive material having a pair of contact members supported on the end portions of said U respectively, said U-shaped member having its bight portion extending parallel to said elongated electrical conductors and at the opposite side of said conductors from said line directly interconnecting said spaced stationary contacts.
  • said spaced stationary contacts are contained in an enclosure having a generally cup-shaped portion at the side of said stationary contacts opposite said are runners, said movable contact bridging means moving between said open and closed circuit positions within said cppshaped portion of said enclosure.
  • said movable contact bridging means includes a pair of movable contacts and rigid conductive supporting means supporting said contacts, said contact bridging means when in said closed circuit position providing a current path between said stationary contacts which .is at the same side of said electrical conductors as said line between said stationary contacts.
  • An electric circuit breaker comprising:
  • each of said conductors having one end thereof terminating adjacent and connected to a diiferent one of said contacts respectively and each of said conductors extending from said one contact in the general direction of the other of said contacts, whereby current passing through each of said conductors flows in the same general direction, and the current passing between said contacts along said are path flows in the opposite direction whereby said arc is repelled by action of the magnetic fields associated with said conductors in a direction away from both of said electrical conductors.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Breakers (AREA)
US592442A 1966-11-07 1966-11-07 Electric circuit breaker with special arc extinguishing structure Expired - Lifetime US3483343A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US59244266A 1966-11-07 1966-11-07

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US3483343A true US3483343A (en) 1969-12-09

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US (1) US3483343A (de)
JP (1) JPS4313566B1 (de)
BR (1) BR6793852D0 (de)
DE (1) DE1640262B2 (de)
ES (1) ES346499A1 (de)
GB (1) GB1196796A (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632932A (en) * 1969-08-08 1972-01-04 Gen Electric Current-limiting circuit breaker having a field strap assembly
US4112275A (en) * 1973-03-26 1978-09-05 Siemens Aktiengesellschaft Contact structure for electrical switching apparatus
FR2457007A1 (fr) * 1979-05-18 1980-12-12 Bbc Brown Boveri & Cie Disjoncteur electrique, en particulier disjoncteur a courant continu de grande puissance
US4276526A (en) * 1980-01-28 1981-06-30 General Electric Company Miniature current limiting circuit breaker
US4370636A (en) * 1981-04-03 1983-01-25 General Electric Company Electromagnetic dual break contactor
US4388506A (en) * 1979-02-07 1983-06-14 Terasaki Denki Sangyo Kabushiki Kaisha Circuit interrupter
EP0231600A1 (de) * 1985-11-25 1987-08-12 Matsushita Electric Works, Ltd. Strombegrenzungsschalter
US5142111A (en) * 1989-09-19 1992-08-25 Telemecanique Circuit breaker with current loops assisting development of the arc
US5146055A (en) * 1989-09-20 1992-09-08 Telemecanique Current limiting switch device
US20130056340A1 (en) * 2011-09-01 2013-03-07 Socomec S.A. Electrical cut-off device with high electrodynamic resistance
CN103038847A (zh) * 2010-07-22 2013-04-10 沙尔特宝有限公司 单向开关dc接触器
CN103824736A (zh) * 2014-03-02 2014-05-28 西安交通大学 一种具有磁吹灭弧装置的直流断路器
CN111211014A (zh) * 2020-03-02 2020-05-29 上海立新电器控制设备有限公司 一种双断点直流断路器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2995638A (en) * 1957-07-03 1961-08-08 Telemecanique Electrique Cut-off switch
US3156803A (en) * 1962-05-29 1964-11-10 Gen Electric Circuit interrupter having uniformly spaced spiral arc runners in a confined atmosphere for improved arc voltage control

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2995638A (en) * 1957-07-03 1961-08-08 Telemecanique Electrique Cut-off switch
US3156803A (en) * 1962-05-29 1964-11-10 Gen Electric Circuit interrupter having uniformly spaced spiral arc runners in a confined atmosphere for improved arc voltage control

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632932A (en) * 1969-08-08 1972-01-04 Gen Electric Current-limiting circuit breaker having a field strap assembly
US4112275A (en) * 1973-03-26 1978-09-05 Siemens Aktiengesellschaft Contact structure for electrical switching apparatus
US4388506A (en) * 1979-02-07 1983-06-14 Terasaki Denki Sangyo Kabushiki Kaisha Circuit interrupter
FR2457007A1 (fr) * 1979-05-18 1980-12-12 Bbc Brown Boveri & Cie Disjoncteur electrique, en particulier disjoncteur a courant continu de grande puissance
US4276526A (en) * 1980-01-28 1981-06-30 General Electric Company Miniature current limiting circuit breaker
US4370636A (en) * 1981-04-03 1983-01-25 General Electric Company Electromagnetic dual break contactor
EP0231600A1 (de) * 1985-11-25 1987-08-12 Matsushita Electric Works, Ltd. Strombegrenzungsschalter
US4743720A (en) * 1985-11-25 1988-05-10 Matsushita Electric Works, Ltd. Current limiting circuit interrupter
US5142111A (en) * 1989-09-19 1992-08-25 Telemecanique Circuit breaker with current loops assisting development of the arc
US5146055A (en) * 1989-09-20 1992-09-08 Telemecanique Current limiting switch device
CN103038847A (zh) * 2010-07-22 2013-04-10 沙尔特宝有限公司 单向开关dc接触器
CN103038847B (zh) * 2010-07-22 2015-09-30 沙尔特宝有限公司 单向开关dc接触器
US20130056340A1 (en) * 2011-09-01 2013-03-07 Socomec S.A. Electrical cut-off device with high electrodynamic resistance
US8723627B2 (en) * 2011-09-01 2014-05-13 Socomec, S.A. Electrical cut-off device with high electrodynamic resistance
CN103824736A (zh) * 2014-03-02 2014-05-28 西安交通大学 一种具有磁吹灭弧装置的直流断路器
CN103824736B (zh) * 2014-03-02 2016-01-06 西安交通大学 一种具有磁吹灭弧装置的直流断路器
CN111211014A (zh) * 2020-03-02 2020-05-29 上海立新电器控制设备有限公司 一种双断点直流断路器

Also Published As

Publication number Publication date
DE1640262A1 (de) 1970-05-27
BR6793852D0 (pt) 1973-01-16
ES346499A1 (es) 1968-12-16
DE1640262B2 (de) 1977-12-22
GB1196796A (en) 1970-07-01
JPS4313566B1 (de) 1968-06-08

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