US3721786A - Circuit breaker - Google Patents

Circuit breaker Download PDF

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Publication number
US3721786A
US3721786A US00203234A US20323471A US3721786A US 3721786 A US3721786 A US 3721786A US 00203234 A US00203234 A US 00203234A US 20323471 A US20323471 A US 20323471A US 3721786 A US3721786 A US 3721786A
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United States
Prior art keywords
electromagnetic driving
primary coil
current
driving force
electromagnetic
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Expired - Lifetime
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US00203234A
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English (en)
Inventor
Y Yoshioka
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Hitachi Ltd
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Hitachi Ltd
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    • 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
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H33/91—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas
    • 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
    • H01H33/02—Details
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/285—Power arrangements internal to the switch for operating the driving mechanism using electro-dynamic repulsion
    • 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
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/882—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts the movement being assisted by accelerating coils

Definitions

  • a puffer type circuit breaker in which an arc extinguishing gas is compressed and released into an arc between contacts upon the initiation of an interrupting operation.
  • the means for compressing the arc extinguishing gas is actuated by an electromagnetic driving means comprising at least two electromagnetic driving units provided by a primary coil and a short ring electromagnetically coupled to said primary coil, and the electromagnetic driving means exhibits a stepped electromagnetic driving force characteristic in response to the displacement'in the driving direction when a predetermined current flows 'in the primary coil.
  • current arcs for a range of small and medium currents may be extinguished by means of gases compressed by the driving-forces generated in the neighborhood of the upper step portion of the stepped electromagnetic driving force characteristic and directed to the current arcs
  • current arcs for a range of large currents may be extinguished by means of gases compressed by the driving forces generated in the neighborhood of the lower step portion of the stepped electromagnetic driving force characteristic and directed to the current arcs.
  • Electromagnetic driving mechanism of the type designed to convert the electromagnetic energy of an interrupting current into a force for compressing an arc extinguishing gas are disclosed in US. Pat. application Ser. No. 582,925 (Japanese Patent Publication No. 8052/1968) in which the electromagnetic attractive and repulsive forces produced among three coils are utilized; and in the applicants copending U.S. Pat. application Ser. No. 821,319 filed May 2, 1969, now U.S. Pat. No. 3,621,171 issued Nov.
  • the electromagnetic driving mechanism comprises a primary coil having a large axial length and a short ring or coil also having a large axial length and disposed in the associated relation with the primary coil, thereby taking advantage of the electromagnetic repulsion force which is produced by a current flowing into the primary coil and an induced current produced in the short ring to cancel the magnetic flux due to the current flowing through the primary coil.
  • These prior art devices have an advantage of the electromagnetic force increasing in proportion to the square of an interrupting current and thus ensuring positive supply of a high pressure gas and in these prior art devices it appears that an extremely large electromagnetic force or the driving force can be provided for interrupting a large current thus ensuring efficient interruption.
  • a further object of the present invention is to provide a circuit breaker equipped with an electromagnetic driving means designed to exhibit a stepped electromagnetic driving force characteristic in response to the displacement in the driving direction when a predetermined current flows therein, whereby even if the discharge occurring before the closing of the contacts causes a current flow in the primary circuit, the resulting electromagnetic driving force is kept sufficiently small thereby ensuring a smooth closing operation.
  • the circuit breaker according to the present invention comprises at least a pair of contacts adapted to part to induce an are, an electromagnetic driving means comprising at least two electromagnetic driving units provided by a primary coil and a short ring or coil electromagnetically coupled to said primary coil, the overall electromagnetic driving force characteristic of said electromagnetic driving means representing the electromagnetic force generated in accordance with the movement of the said means taking the form of a stepped curve in response to the displacement in the driving direction when a predetermined current flows into said primary coil, current diverting means for diverting the current to be interrupted into said primary coil, means adapted to be actuated by said electromagnetic driving means to compress an arc extinguishing gas, and a nozzle for directing a high pressure gas produced by said compressing means into said are, whereby the gas compressed by the driving force generated in the neighborhood of the upper step portion of said electromagnetic driving force characteristic is directed into arcs for a range of small and intermediate currents and the gas compressed by the electromagnetic force generated mainly in the neighborhood of the lower step portion of said characteristic is directed into arcs for the large currents
  • FIG. 1 is a perspective view of an embodiment of the circuit breaker of the present invention showing part thereof in longitudinal section.
  • FIG. 2 is a longitudinal sectional view showing the interrupting section of the circuit breaker shown in FIG. 1.
  • FIGS. 3a and 3b are diagrams useful for explaining the generation of driving force by the electromagnetic driving means in the breaker of FIG. 2.
  • FIGS. 5a and 5d are schematic diagrams showing in longitudinal section various modifications of the electromagnetic driving means used in the circuit breaker of FIG. ll.
  • FIG. 6 is a longitudinal sectional view of another embodiment of the circuit breaker of the present invention showing the interrupting section thereof.
  • FIG. 7 is a perspective view showing a component part of the circuit breaker of the invention illustrated in FIG. 6 with a portion broken away.
  • FIG. 8 is a diagram useful for explaining the relationship between the overall electromagnetic driving force and the interruption of current in a further embodiment of the circuit breaker according to the present invention.
  • a grounded tank 1 contains sulfur hexafluoride (SF sealed thereinto under the pressure of 3.5 kg/cm for example, and in this atmosphere an interrupting section 2 which is not shown in detail is insulated and supported by an insulating support 3. Current is fed to the interrupting section 2 by way of a pair of bushings 4 and 5.
  • the bushing are similar in construction and as will be seen from the figure showing the bushing 5 in section the bushing 5 comprises a terminal strip 6, a sleeve 7, a metal tube 8, a conductor 9 and an insulating spacer l0, and the conductor 9 is insulated from the metal tube 8 and the grounded tank 1 by the sleeve 7 and the insulating spacer 10.
  • the bushings 4 and 5 are filled with the same SF gas as sealed into the grounded tank 1.
  • a current transformer 11 is also mounted on the outer periphery of the metal tube 8 to detect the passage of an excessive current through the conductor 9.
  • the movable parts of the interrupting section 2 are actuated in either of the closing direction or the interrupting direction by an operating linkage provided on the outside of the grounded tank 1 and comprising an operating lever 13 extending through an air tight chamber 12 disposed at one end of the grounded tank 1 and an insulating rod 14 connected to the operating lever 13.
  • a movable main contact 22 and a movable arcing contact 23 are arranged opposite to and coaxially with a hollow fixed contact 21 which is electrically connected to the conductor in the bushing 4, with the contacts 22 and 23 being secured to an electrically conducting operating rod 24.
  • the operating rod 24 itself is connected to the insulating rod 14 by a suitable securing means 25.
  • the operating rod 24 carries a puffer cylinder 26 and a puffer piston 28 constituting compressing means 27 with the puffer cylinder 26 is secured to the grounded tank 1 by means ofa short ring 29 and the insulating support 3.
  • the puffer piston 28 and the short ring 29 are integrally formed with an electrically conducting metal and a current collector 30 is disposed between the puffer piston 28 and the operating rod 24.
  • the operating rod 24 is provided through the intermediary of a stay 31 with a primary coil 32 which constitutes an electromagnetic driving means with the short ring 29 and thus a current path is provided through the operating rod 24, stay 31, primary coil 32,
  • the primary coil 32 comprises the coil wire wound at equal distance and then finished, as a whole, into a coil by means of molding, for example.
  • the short ring 29 comprises two short ring units 29a and 29b spaced away from the primary coil 32 at different distances.
  • the current collector 34 disposed on the short ring 29 and the sliding plate 33 mounted on the primary coil 32 are omitted.
  • the rightward drive of the primary coil 32 be represented in the upper portion above the one-dot chain line and the leftward drive of the coil in the lower portion blow the one-dot chain line, if then the primary coil 32 is moved in the axial direction of the operating rod 24 and the values of the electromagnetic repulsion force the electromagnetic force of repulsion at the various points are obtained and represented by a curve, the electromagnetic repulsion force characteristic is given as shown by a dotted line A in FIG. 3 b.
  • the electromagnetic repulsion force characteristic between the primary coil 32 and the short ring element 29b can be represented by a curve designated as a curve B.
  • the driving force can be represented by combining the curves A and B together and the overall characteristics is thus as shown in FIG. 3 b by a solid line C.
  • the driving forces corresponding to the stepped portions of the overall electromagnetic repulsion force characteristic are employed for the purpose of compressing an arc extinguishing gas.
  • the parting distance between the fixed contact 211 and the movable arcing contact 23 can be practically expressed in terms of the distance between the positions X and Y plus the distance traveled by the primary coil 23 before the time that an interrupted current is diverted into the primary circuit 32.
  • curves D and B shows stepped electromagnetic driving forces obtainable for different values of current flowing through the primary coil 32 and, as previously mentioned, the driving forces are proportional to the square of the currents.
  • the curve D shows the electromagnetic driving force characteristic for the small currents
  • the curve E shows the characteristic for the large currents and that the characteristic curve changes from the curve D to the curve E and vice versa with the variation of current values.
  • the graph of FIG. 3b shows the relationship between the displacement in the driving direction and the electromagnetic driving force.
  • FIG. 3b shows the curves obtainable when the primary coil 32 is moved at a constant speed relative to the short ring 29.
  • the electromagnetic driving force increases as the current flowing through the primary coil 32 increases and thus the velocity of movement of the primary coil 32 increases.
  • the characteristic curve therefore takes a compressed form with respect to the time.
  • the characteristic curves D and E show the electromagnetic driving force characteristics taking into account the aforesaid changes with respect to the time due to the variation of current values.
  • the electromagnetic driving force characteristic curves D and E take substantially the stepped forms and thus there will be no great variation of the maximum electromagnetic forces during the first and second interrupting periods even in the presence of a considerable variation in the contact parting phase.
  • the circuit breaker according to the present invention is capable of taking advantage of stable electromagnetic forces which are not dependent on the contacting parting phase.
  • One of the electromagnetic forces is the driving force in the axial direction which acts between the short ring 29 and the primary coil 32 on the whole and in addition another electromagnetic force due to the current flowing through the primary coil 32 causing the coil itself to expand and still another electromagnetic force tending to press the primary coil 32 owing to the currents in the outer short ring 29 and in the inner primary coil 32 flowing in the opposite directions.
  • the latter two electromagnetic forces act in radial directions and thus they are not employed for actuating the compressing means, rather they are harmful electromagnetic forces tending to cause damage to the primary coil 32.
  • the primary coil 32 and the short ring 29 overlap each other considerably. This causes a cancellation effect between the electromagnetic force causing the primary coil 32 to expand and the electromagnetic force caused by the current in the short ring 29 and tending to crush the primary coil 32, thereby substantially decreasing the radial electromagnetic forces tending to damage the primary coil 32.
  • the closing operation is completed when the operating rod 24 is returned to the illustrated position and the movable main contact 22 engages with the fixed contact 21.
  • a discharge is caused prior to the closing since the circuit voltage has previously been developed between the contacts 21 and 22.
  • This preceeding discharge excites the primary coil 32 again so that an electromagnetic force of repulsion is produced between the primary coil 32 and the short ring 29 and thus owing to the fact that the primary coil 32 is directly connected to the operating rod 24 there is the danger of the produced electromagnetic repulsion force tending to oppose the operating force, thus making it impossible to accomplish the closing.
  • the electromagnetic repulsion force produced at the position of occurrence preceeding discharge i.e., at the position corresponding to the early stage of interrupting operation, is relatively small and thus it does not cause a failure in the closing operation. This considerably reduces the un desirable effect on the interrupting operation subsequent to the closing operation.
  • FIGS. a through 5d illustrate various combinations of electromagnetic driving units for different stepped electromagnetic driving force characteristic requirements.
  • a primary coil 51 having an increased number of turns at the left end thereof is mounted on the operating rod 24 by means of the stay 31 to cooperate with a cylindrical short ring 50.
  • a stepped primary coil 61 is mounted similarly on the operating rod 24 by means of the stay 31 for cooperation with a cylindrical short ring 60.
  • an L-shaped short ring is associated with a similarly L-shaped primary coil 71 and there is a feature in that the distance between the short ring 70 and the primary coil 71 is increased at the flanged portions thereof.
  • an inclined primary coil 81 is arranged for a cylindrical short ring 80.
  • the distance between the short ring and the primary coil 81 changes linearly.
  • coil elements 81a, 81b and 810 constituting the left half and coil elements 81d, 81c and 81f constituting the right half of the primary coil 81 as a group, respectively, and consider the average driving forces produced by these groups, it will be readily understood that this combination is equivalent with that shown in FIG. 5b.
  • the interrupting section of a circuit breaker in which the electromagnetic driving means is provided with the required stepped electromagnetic driving force characteristic by using metals of different properties for its electromagnetic driving units, i.e., the short ring.
  • the puffer puffer piston comprises a so-called floating puffer-type piston which is free to move relative to the puffer cylinder.
  • a movable main contact 102 and a movable arcing contact I03 adapted to perform wiping operation are secured to an electrically conducting operating rod 104 which is connected to an insulating rod 105 by securing means 106 such as a bolt.
  • an electrically conducting puffer cylinder 107 Disposed on the contact side of the operating rod 104 is an electrically conducting puffer cylinder 107 and an insulating layer 108 is formed on the outer periphery of the puffer cylinder 107 excepting a portion thereof.
  • the current diverting means 109 comprises current collectors 110 and supporting guide plates for the puffer cylinder 107 which are alternately arranged circumferentially and both the collectors 110 and the guide plates 111 are also secured separately to an insulating support 1 l2.
  • the forward ends of the supporting guide plates 111 are secured to a ring member 113 having an L-shape in section by securing means 114 such as bolts and thus the plates 111 cooperate with the ring member 113 to positively secure the puffer cylinder 107.
  • Springs 115 are disposed in the radial direction between the ring member 113 and the current collectors 110 to ensure positive electrical connection between the puffer cylinder 107 and the current collectors 110.
  • this current diverting means 109 performs slit arc extinction in the manner that will be explained later when the interruption of current is to be effected, in the event that damage is feared or has been done to the current collectors 110 due to the slit arc extinction, the current collectors 110 may be easily checked and replaced by simply removing the ring member 113.
  • the current collectors 110 are provided with an insulating layer 116 on the inner side thereof.
  • both the insulating layers 108 and 116 effect the slit arc extinction thus interrupting the path of current between the puffer cylinder 107 and the current collectors 110.
  • the operating rod 105 is provided with a primary coil 110 mounted at the other end thereof by means of an electrically conducting stay 117 and the other end of the primary coil 110 is connected through a current collector 119 to a sliding contact plate 120 which is electrically connected to the current collectors 110.
  • An insulating support 112 is provided at its end with a buffer member 121 and a short ring 122 is disposed to abut against the buffer member 121 and. in opposition to the primary coil 110.
  • the short ring 122 is integrally formed with a puffer piston 123 which is disposed floatingly relative to the operating rod 1041 by means of a spring 124 provided between the puffer piston 123 and the puffer cylinder 107.
  • the short ring 122 differs from the short ring 29 shown in FIG. 2 and it is perfectly cylindrical having no stepped portion. Instead, the short ring 122 comprises a portion 122a and a portion 122b which are for example made of copper and aluminum alloy, respectively.
  • the conductivity of copper differs from that of the aluminum alloy and thus when a current flows into the primary coil 110 the values of the induced currents in the two portions 122a and 12212 are not identical due to a difference in resistance values between them.
  • the short ring 122 has the same effect with the stepped short ring 29 shown in FIG. 2, that is, the overall electromagnetic driving force characteristic of this embodiment has a stepped form as shown in FIG. 3.
  • This current flow through the primary coil 118 produces an electromagnetic force of repulsion between the primary coil 118 and the short ring 122 moving the puffer piston 123 to the left against the spring 124 thus reducing the space defined by the puffer piston 1223 together with the puffer cylinder 107 in the manner as shown in the lower part of FIG. 6.
  • a mass of SR, gas is compressed and directed into the are through an insulating nozzle 125 thereby cooling and extinguishing the arc and thus completing the interruption.
  • FIG. 8 there is shown the relationship between the electromagnetic driving force and the interruption of current where the generation of an excessively large electromagnetic driving force is prevented and thus the compressing means is actuated at a suitable velocity with respect to the current change by employing a suitable combination of the short ring and primary coil, such as a combination of two short rings and two primary coils.
  • the electromagnetic driving force characteristics obtainable for a range of small currents and for a range of excessive currents when there is a predetermined current flow into the primary coil take forms which may well be considered as comprising two peaks having different crest values rather than considered to be stepped forms. Then, since an AC current flows into the primary coil, a curve G, represents the electromagnetic driving force characteristic for the small currents, whereas a curve 11 represents the electromagnetic driving force characteristic for the excessive currents.
  • the compressing means is actuated by a driving force which corresponds to the current waveform thereby ensuring an efficient blasting of compressed gas to complete the interruption.
  • suppression of the initial inductance of the primary coil ensures an efficient divertion of a current to be interrupted into the primary coil.
  • a circuit breaker comprising at least a pair of contacts adapted for parting to induce an arc, electromagnetic driving means exhibiting a stepped electromagnetic driving force characteristic when a predetermined current flows thereinto, means for diverting a current to be interrupted into said electromagnetic driving means in response to an interruption instruction, means adapted to be actuated by said electromagnetic driving means to compress an arc extinguishing gas, and an insulating nozzle for directing a high pressure gas produced by said compressing means into said arc.
  • said electromagnetic driving means comprises a combination of at least two electromagnetic driving units provided by a primary coil into which the interrupting current is caused to flow and a short ring or short coil electromagnetically coupled to said primary coil, whereby when there is a predetermined current flow in said primary coil, the characteristic of the summation of electromagnetic driving forces produced between said primary coil and said short ring or short coil has a stepped form.
  • said electromagnetic driving means comprises a cylindrical primary coil into which the interrupting current is caused to flow, and a stepped cylindrical short ring or stepped cylindrical short coil electromagnetically coupled to said primary coil, whereby the electromagnetic driving force characteristic of said electromagnetic driving means has a stepped form when there is a predetermined current flow in said primary coil.
  • said electromagnetic driving means comprises a cylindrical primary coil into the interrupting current is caused to flow, and a short ring electromagnetically coupled to said primary coil and comprising two metallic cylindrical portions of different materials mechanically connected with each other in the axial direction, whereby the electromagnetic driving force characteristic of said electromagnetic driving means has a stepped form when there is a predetermined current flow in said primary coil.
  • a circuit breaker comprising at least a pair of contacts adapted for parting to induce an arc, electromagnetic driving means exhibiting a stepped electromagnetic driving force characteristic when there is a predetermined current flow therein, means for diverting a current to be interrupted into said electromagnetic driving means in response to an interruption instruction, compressing means adapted to be actuated by said electromagnetic driving means to compress an arc extinguishing gas, and a nozzle for directing a high pressure gas produced by said compressing means into said arc, whereby the electromagnetic driving force according to said electromagnetic driving force characteristic increases in a rising step manner with the lapse of time.
  • a circuit breaker comprising at least a pair of contacts adapted for parting to induce an arc, electromagnetic driving means exhibiting an electromagnetic driving force characteristic with two peaks of different crest values when there is a predetermined current flow therein, means for diverting a current to be interrupted into said electromagnetic driving means in response to an interruption instruction, means adapted to be actuated by said electromagnetic driving means to compress an arc extinguishing gas, and a nozzle for directing a high pressure gas produced by said compressing means into said are, whereby the lower peak of said crest values of said electromagnetic driving force characteristic appears during the initial period with the lapse of time.
  • said electromagnetic driving means comprises a combination of at least two electromagnetic driving units provided by a primary coil into which the interrupting current is caused to flow, and a short ring or short coil electromagnetically coupled to said primary coil, whereby the characteristic of the summation of electromagnetic driving forces produced between said primary coil and said short ring or short coil takes a form with two peaks of different crest values when a predetermined current flows in said primary coil.

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  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Circuit Breakers (AREA)
US00203234A 1970-12-11 1971-11-30 Circuit breaker Expired - Lifetime US3721786A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US00203234A US3721786A (en) 1970-12-11 1971-11-30 Circuit breaker

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP45109475A JPS5019330B1 (enrdf_load_stackoverflow) 1970-12-11 1970-12-11
US00203234A US3721786A (en) 1970-12-11 1971-11-30 Circuit breaker

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US3721786A true US3721786A (en) 1973-03-20

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Application Number Title Priority Date Filing Date
US00203234A Expired - Lifetime US3721786A (en) 1970-12-11 1971-11-30 Circuit breaker

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US (1) US3721786A (enrdf_load_stackoverflow)
JP (1) JPS5019330B1 (enrdf_load_stackoverflow)
FR (1) FR2117646A5 (enrdf_load_stackoverflow)
IT (1) IT943214B (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3902031A (en) * 1974-07-17 1975-08-26 Ite Imperial Corp Puffer interrupter operating mechanism with magnetic assist and arcless and switchless coil cut-in
US4041263A (en) * 1975-08-22 1977-08-09 General Electric Company Electric circuit interrupter of the puffer type comprising a magnetically actuated piston
US4059741A (en) * 1975-03-10 1977-11-22 Hitachi, Ltd. Puffer type gas circuit breaker
US4105879A (en) * 1976-03-12 1978-08-08 Hitachi, Ltd. Magnetic puffer type gas circuit breaker
US5453591A (en) * 1994-04-05 1995-09-26 Abb Power T&D Company Inc. Sensing structure for component wear in high voltage circuit interrupters

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3551624A (en) * 1966-09-01 1970-12-29 Westinghouse Electric Corp Gas-flow circuit interrupters having improved orifice and contact constructions
US3551626A (en) * 1967-02-16 1970-12-29 Westinghouse Electric Corp Fluid-blast circuit interrupters with improved electromagnetic driving means
US3621171A (en) * 1968-05-06 1971-11-16 Hitachi Ltd Gas blast circuit breaker with puffer piston having an electrodynamic assist in the form of axially overlapping coils

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3551624A (en) * 1966-09-01 1970-12-29 Westinghouse Electric Corp Gas-flow circuit interrupters having improved orifice and contact constructions
US3551626A (en) * 1967-02-16 1970-12-29 Westinghouse Electric Corp Fluid-blast circuit interrupters with improved electromagnetic driving means
US3621171A (en) * 1968-05-06 1971-11-16 Hitachi Ltd Gas blast circuit breaker with puffer piston having an electrodynamic assist in the form of axially overlapping coils

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3902031A (en) * 1974-07-17 1975-08-26 Ite Imperial Corp Puffer interrupter operating mechanism with magnetic assist and arcless and switchless coil cut-in
US4059741A (en) * 1975-03-10 1977-11-22 Hitachi, Ltd. Puffer type gas circuit breaker
US4041263A (en) * 1975-08-22 1977-08-09 General Electric Company Electric circuit interrupter of the puffer type comprising a magnetically actuated piston
US4105879A (en) * 1976-03-12 1978-08-08 Hitachi, Ltd. Magnetic puffer type gas circuit breaker
US5453591A (en) * 1994-04-05 1995-09-26 Abb Power T&D Company Inc. Sensing structure for component wear in high voltage circuit interrupters

Also Published As

Publication number Publication date
IT943214B (it) 1973-04-02
JPS5019330B1 (enrdf_load_stackoverflow) 1975-07-05
DE2161507B2 (de) 1975-10-09
DE2161507A1 (de) 1972-06-29
FR2117646A5 (enrdf_load_stackoverflow) 1972-07-21

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