US2085549A - Electric control device - Google Patents

Electric control device Download PDF

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Publication number
US2085549A
US2085549A US45417A US4541735A US2085549A US 2085549 A US2085549 A US 2085549A US 45417 A US45417 A US 45417A US 4541735 A US4541735 A US 4541735A US 2085549 A US2085549 A US 2085549A
Authority
US
United States
Prior art keywords
circuit
arc
current
saturable
electric
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
US45417A
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English (en)
Inventor
Wilfred F Skeats
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.)
General Electric Co
Original Assignee
General Electric Co
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 BE417961D priority Critical patent/BE417961A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US45417A priority patent/US2085549A/en
Priority to DEA80759D priority patent/DE662071C/de
Priority to FR811881D priority patent/FR811881A/fr
Priority to GB28276/36A priority patent/GB479621A/en
Application granted granted Critical
Publication of US2085549A publication Critical patent/US2085549A/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
    • 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
    • H01H33/7007—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid wherein the flow is a function of the current being interrupted

Definitions

  • My invention relates to electric control devices, more particularly to an electromagnetic device for controlling the relative position of a portion of the conducting path, either solid or gaseous, of an electric circuit, with respect to a magnetic circuit by and-in accordance with the magnitude of. the current traversing said circuit.
  • an electric circuit interrupter of the oil or fluid-blast type is provided with electromagnetic means including a magnetic path which is linked by the are upon opening of the circuit, arranged so that within a predetermined range of current the arc is moved in one direction and lengthened, and beyond the aforesaid range of current is moved in the op- :posite direction towards or maintained in a position of normal or shortest possible length.
  • the arc pressure which in interrupters of the aforesaid type is utilized to cause an arc-extinguishing fluid blast, is regulated so that the pressure is increased at :low current by lengthening of the arc, and at high current when the pressure is entirely adequate or in fact may even be excessive the arc is automatically shortened to its normal length.
  • the electromagnetic arrangement may control the relative position of a solid electric conductor forming part of an electric circuit for indicating, for example, when the magnitude of. the current in said circuit is within predetermined limits.
  • Fig. l. is an eleva tional view, partly in section, of a portion of an electric circuit breaker embodying my invention
  • Fig. 2 is a sectional plan view taken along the line 2-2 of Fig. 1
  • Fig. 3 is a view, partly in section, illustrating the application or my invention to a relay or contacts
  • Fig. 4 is a plan view of the electromagnetic device shown in Fig; 3.
  • Fig. 1 of my invention is illustrated as applied to an oil circuit breaker of the oil-blast type comprising an oil-containing casing i, the oil level being indicated, and relatively movable con tacts 2, 3 and i immersed in the oil for opening the circuit.
  • the contact structure 3 comprises a pair of pivoted conducting gate members 3' which are normally biased by springs, as illustrated, into engagement so as a to be interposed in the path between the stationary contact 2 and the movable rod t.
  • baffle structure 5 For the purpose of directing the oil blast caused by the pressure generating arc insulating baffle structure 5 is mounted in the casing so as to form a passage 6 which communicates with the pressure generating arc and traverses the main arc to exhaust above the insulating bafiie.
  • the baffle b which also supports the intermediate contact structure 3, is provided with a vertical bore i for guiding the rod contact d.
  • an oil-blast circuit interrupter of the above type the operation within a comparatively wide range of current may not be uniform, particularly at high voltages, due to the fact that at low current insumcient pressure may be generated by the are for creating an effective oil blast. At highcurrent the blast is most efiective and the circuit is quickly and positively interrupted within the higher range of current.
  • the primary or pressure generating are between the contacts 2 and t is automatically regulated in accordance with the arc current so that the arc is looped and lengthened at low current for increasing the arc pressure and is maintained in the normal or position of. shortest possible length at high current.
  • an electromagnetic device 8 is mounted in the casing i between the contacts 2 and 3 so that the pressure generating arc is drawn adjacent or through said device.
  • the electromagnetic device 8 comprises an insulating block or disk ii of a 2 sonata-o suitable material in which is molded a soft iron core it, as best illustrated by Fig. 2.
  • Ellie core in is preferably laminated as shown at ii and is completely enclosed and insulated by the insu- 5 lating material at 9.
  • the disk 9 is provided with a central aperture l2 through which the rod contact l operates, thereby linking the electric and magnetic circuits.
  • a lateral slot i2 extends from aperture 12 towards the periphery of the disk;
  • the iron core fill is positioned so that it closely surrounds the aperture i2 and slot i2 as illustrated by Fig. 2, the portion of the core surrounding the slot it being of comparatively 15 small cross section, as at M, so that that part of the magnetic circuit can be readily saturated, and the opposite part of the magnetic circuit of comparatively large cross section, at H, is pro vided with a magnetic gap.
  • the magnetic field established by the are which is drawn centrally of the core It] causes, in accordance with well known principles, looping of the are into the slot 12' as indicated by Fig. 1.
  • 'Ihat is, at low currents the magnetic path I3 is not saturated and is traversed by the main flux, comparatively little flux flowing through the path at I by reason of the gap. Since the magnetic field established by the arc tends to seek a path of minimum reluctance, the arc is pulled towards or into the portion Hi.
  • arcing horns or the like may be connected respectively to contacts 2 and 3 for facilitating movement of the arc into the slot l2. Accordingly, due to lengthening of the pressure generating are within the slot I2, the arc pressure is correspondingly increased and the oil blast through the passage 6 and across the main arc is more effective.
  • the portion l3 of the magnetic circuit becomes saturated with the result that the flux which passes across the air gap between the non-saturable portions ll of the magnetic circuit continues to increase substantially in proportion to the current and so eventually predominates.
  • the arc is moved by the magnetic forces in the opposite direction and at predetermined high currents the arc tends to extend directly between the contacts 2 and 3 as normally drawn so as to have the shortest possible length.
  • the position and length of the are automatically controlled in accordance with the magnitude of the current in the circuit to be interrupted without the use of auxiliary movable contact structure or movable elements.
  • Fig. 3 my invention is illustrated, by way of example, as applied to a relay for indicating maximum and minimum current conditions in 'a. circuit.
  • the laminated iron core In in the present instance is provided with a movable coil I! which is traversed by current in the circuit IS.
  • the coil I5 is carried by a frame l5 suitably guided for reciprocal rectillnear movement about the portion l3, such as by an insulated rod II which is slidably mounted in the core ll as illustrated by Figs. 3 and 4 and is centered by light springs ii".
  • the portion H of the magnetic circuit is provided with an air gap W as in the previous instance. The operation of the device is believed to be apparent from the above description.
  • the coil I5 At minimum or low current the coil I5 is moved towards the right or saturable side and the rod H which carries a bridging contact it closes an indicating circuit lighting the signal lamp G.
  • the coil 35 When high or maximum current is reached, the coil 35 is moved towards the left or comparatively non-saturable side so as to close through the contact it the circuit for en-- ergizing the signal lamp R, the principle of operation being identical with that previously described in connection with Figs. 1 and 2. Within a predetermined range there will be no visual indication. 10
  • An electric control device comprising means forming a magnetic circuit having a saturable m portion and a comparatively non-saturable portion located substantially opposite said saturable portion and an electric circuit, said circuits be ing linked so that within a predetermined range oi current in said electric circuit there is rela- 2' tive bodily movement in the direction of one of said portions between the immediately linked portions of said circuits and beyond the aforesaid range of current said circuits tend to assume a relative position in the opposite direction.
  • An electric control device comprising means forming a magnetic circuit having a saturable portion and a comparatively non-saturable portion, said magnetic circuit being linked with an electric circuit arranged between said portions 5 so that a portion of said electric circuit immediately-linked with said magnetic circuit is moved in the direction of one or said portions when current insufficient to cause saturation 01 said saturable portion traverses said electric circuit, 40 and in the opposite direction when said current exceeds a value causing saturation of said saturable portion.
  • An electric control device comprising means forming magnetic circuit having a. saturable 45 portion and a comparatively non-saturable portion, said saturable portion defining an elongated slot, and an electric circuit linked with said magnetic circuit and arranged so that a. portion of said electric circuit is moved transversely of said 50 slot in one direction when current insuflicient to cause saturation of said saturable portion traverses said electric circuit, said portion being uppositcly positioned when said current exceeds a value causing saturation of said saturable por- 55 tion.
  • An electric control device comprising means forming a magnetic circuit having a saturable portion and a comparatively non-saturable portion, and an electric circuit including an are 60 linked with said magnetic circuit, said are being positioned adjacent said non-saturable portion so that there is movement of said are toward said saturable portion when current insumcient to cause saturation of said saturable portion trav- 65 erses said electric circuit, and in the opposite direction when said current exceeds a value causing saturation of said saturable portion.
  • An electric control device comprising means forming a magnetic circuit having a saturable [0 portion and a. comparatively non-saturable portion including an air gap. said saturcble portion ,deflning an elongated slot, on electric conductor forming part of an electric circuit which is linked with said magnetic circuit movable within said 1' slot in one direction when current insumcient to cause saturation or said saturable portion traverses said electric circuit, and in the opposite direction when said circuit exceeds a value causing saturation of said saturable portion, and means operatively connected to said movable conductor for indicating predetermined maximum and minimum currents in said circuit.
  • An electric circuit interrupter oi the oil blasttype having means forming a pressure generating arc, and electromagnetic means for moving transversely and lengthening said pressure generating are only in accordance with comparatively low current traversing said interrupter.
  • Anelectric circuit interrupter of the oil-blast type having means forming a pressure generating are, means forming a magnetic circuit having a saturable portion and a comparatively nonsaturable portion and linking the electric circuit including said are, said magnetic circuit arranged so that said pressure generating arc is lengthened when the arc current is insuflicient to cause satture arranged'to form a pressure generating arc and a, mainarc, an iron core forming a magnetic circuit which links said pressure generating are, said core having a saturable portion at one end and a.
  • comparatively non-saturable portion including an air gap at the opposite end and arranged so that when the arc current is insufficient to cause saturation of said saturable portion the arc is lengthened and moved towards said saturable portion for increasing the blast effect at said main arc and is positioned at normal length near said non-saturable portion when the arc current exceeds a value causing saturation of said saturable portion.

Landscapes

  • Breakers (AREA)
  • Electromagnets (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US45417A 1935-10-17 1935-10-17 Electric control device Expired - Lifetime US2085549A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE417961D BE417961A (en, 2012) 1935-10-17
US45417A US2085549A (en) 1935-10-17 1935-10-17 Electric control device
DEA80759D DE662071C (de) 1935-10-17 1936-10-16 Einrichtung zur Steuerung der von einem Magnetfeld beeinflussten Bewegung stromdurchflossener Teile, insbesondere von Schaltern und Relais
FR811881D FR811881A (fr) 1935-10-17 1936-10-16 Perfectionnements aux disjoncteurs électriques
GB28276/36A GB479621A (en) 1935-10-17 1936-10-17 Improvements in and relating to electromagnetic control devices for circuit interrupters and switches

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US45417A US2085549A (en) 1935-10-17 1935-10-17 Electric control device

Publications (1)

Publication Number Publication Date
US2085549A true US2085549A (en) 1937-06-29

Family

ID=21937763

Family Applications (1)

Application Number Title Priority Date Filing Date
US45417A Expired - Lifetime US2085549A (en) 1935-10-17 1935-10-17 Electric control device

Country Status (5)

Country Link
US (1) US2085549A (en, 2012)
BE (1) BE417961A (en, 2012)
DE (1) DE662071C (en, 2012)
FR (1) FR811881A (en, 2012)
GB (1) GB479621A (en, 2012)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2866926A (en) * 1954-10-01 1958-12-30 English Electric Co Ltd Electrical relays
US3022400A (en) * 1957-06-27 1962-02-20 Ahlefeldt Rolf S Von Two-way solenoid

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2866926A (en) * 1954-10-01 1958-12-30 English Electric Co Ltd Electrical relays
US3022400A (en) * 1957-06-27 1962-02-20 Ahlefeldt Rolf S Von Two-way solenoid

Also Published As

Publication number Publication date
FR811881A (fr) 1937-04-24
BE417961A (en, 2012)
GB479621A (en) 1938-02-09
DE662071C (de) 1938-07-04

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