US2797369A - Quick reset induction time delay device - Google Patents

Quick reset induction time delay device Download PDF

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Publication number
US2797369A
US2797369A US350584A US35058453A US2797369A US 2797369 A US2797369 A US 2797369A US 350584 A US350584 A US 350584A US 35058453 A US35058453 A US 35058453A US 2797369 A US2797369 A US 2797369A
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United States
Prior art keywords
induction
time delay
electromagnet
drag
relay
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
US350584A
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English (en)
Inventor
Richard E Cordray
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 JP76225457A priority Critical patent/JPS304368B1/ja
Application filed by General Electric Co filed Critical General Electric Co
Priority to US350584A priority patent/US2797369A/en
Application granted granted Critical
Publication of US2797369A publication Critical patent/US2797369A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H53/00—Relays using the dynamo-electric effect, i.e. relays in which contacts are opened or closed due to relative movement of current-carrying conductor and magnetic field caused by force of interaction between them
    • H01H53/10—Induction relays, i.e. relays in which the interaction is between a magnetic field and current induced thereby in a conductor
    • H01H53/12—Ferraris relays

Definitions

  • the invention relates to induction time delay devices, particularly overcurrent relays of the inductive type having very inverse time delay characteristics.
  • the principal object is to provide such an electroresponsive induction relay or the like with an improved electromagnetic induction drag energization control combination for selectively introducing a desired long time delay in the operation of a movable induction element as well as eliminating the electromagnetic drag to enable a quick reset of the element to be obtained.
  • the time delay in the operation of the movable induction element of a relay is obtained by interlinking a permanent magnet so as to produce eddy current braking action or drag upon movement of the induction element in both the operating and the reset directions.
  • the reset time delay of such induction relay inherently is about the same as the operating time delay. This is often quite undesirable particularly where a very long time delay relay operating characteristic is required.
  • Another object of the present invention is to provide an induction drag electromagnet control combination that can be used as a substitute for a high strength permanent magnet in very long time delay electro-responsive induction relay service with the added advantage of quick reset.
  • Another object is to maintain the drag electromagnet deenergized under normal conditions and energize the drag electromagnet only when the magnetic drag is required.
  • the rotatable induction element of a time delay overcurrent relay is spring biased to the reset position and is provided with a drag electromaguet for producing a very strong non-directional magnetic drag to retard the rotation of the element.
  • An instantaneous overcurrent responsive relay preferably having its operating winding energized in series with the operating winding of the time delay overcurrent relay is provided with contacts for selectively controlling the energization of the drag electromagnet so as to produce the drag only upon operative energization of the series connected windings. In this manner a retarding influence is exerted on the induction element when rotating in its operating direction, while the drag is eliminated and the element is free to quickly reset upon removal of the operative energization of both windings.
  • the tripping winding it) of the circuit breaker 11 is energized under the control of the time delay responsive overcurrent induction relay indicated generally by the reference character 12.
  • This relay 12 is provided with the improved induction drag electromagnet control combination of the present invention to enable a very inverse tripping characteristic to be obtained as well as to enable a quick reset of the induction relay to be obtained as soon as the circuit breaker 11 opens the circuit.
  • the induction disk element 15 of relay 12 is axially mounted on the pivot shaft 16 that is supported in suitable bearings not shown. Shaft 16 is biased to rotate in the clockwise or reset direction by the spiral spring 17 until the contact operating arm 18 engages with the adjustable stop 19.
  • the driving electromagnet 21 for the induction disk element 15 produces a driving torque in the counterclockwise or forward direction when its magnetizing winding 22 is energized in response to predetermined overcurrent conditions in the circuit conductors L1, L2, L3 by means of suitable current transformers 23.
  • the operating winding 25 of an instantaneous responsive overcurrent relay 26 is shown connected in series with the magnetizing winding 22 so as to enable relay 26 to respond instantaneously to the same overcurrent conditions as the time delay overcurrent relay 12.
  • the driving electromagnet 21 is provided with the usual pole shading windings 2'7 in order to produce the driving torque by inducing eddy currents in the induction disk 15 of sufficient strength to overcome the biasing force of the spiral spring 17 and thereby drive the contact operating arm it; in the counterclockwise direction away from stop 19 whenever the predetermined overcurrent condition occurs in any one or all of the circuit conductors L1, L2, L3.
  • the drag electromagnet 34 is interlinked with the induction disk 15 so as to induce strong eddy currents therein and thereby create a magnetic braking action that will retard the counterclockwise or forward rotation of the disk 15.
  • the magnetizing winding 35 of the drag electromagnet 34 remains deenergized.
  • the instantaneous overcurrent responsive relay 26 closes its contact and thereby energizes the winding 35 from a suitable supply source indicated as plus and minus so as to produce strong non-directional retarding action during the counterclockwise rotation of the disk 15 by the driving electromagnet 21.
  • the improved drag electromagnet energization control combination of the present invention enables the quick reset of the time delay overcurrent induction relay 12 to be obtained.
  • Use of the instantaneous overcurrent relay 26 aids in producing a quick reset after only partial operation of relay 12 even though circuit breaker 11 does not open.
  • relay 26 Will open to deenergize magnetizing winding 35 thereby eliminating retarding action while disk 15, which has rotated through a portion of its total travel due to the excessive overcurrent, quickly returns to its fully reset position.
  • a movable induction element having means for biasing the element to a reset position, current responsive means for moving the element forward from the reset position when the current exceeds a predetermined value, a drag electromagnet interlinked with the induction element for retarding movement thereof upon energization of the electromagnet, and current responsive means for energizing the drag electromagnet only when the current exceeds the predetermined value thereby to retard forward movement of said induction element while enabling said induction element to quickly return to the reset position when the current is interrupted.
  • a movable induction element having means for biasing the element to a reset position
  • an electro-responsive driving device inductively interlinked with the induction element for moving the element forward from the reset position upon energization of the electro-responsive driving device in excess of a predetermined amount
  • a drag electromagnet inductively interlinked with the induction element
  • an electro-responsive switching device connected to energize said drag electromagnet in response to excessive energization of the electro-responsive driving device thereby to retard forward movement of said induction element and to produce a quick reset of the induction elementwhenever the energization of said electro-responsive driving device becomes less than the predetermined amount.
  • a time delay overcurrent induction relay having a rotatable induction element provided with means biasing the element to a reset position and having overcurrent responsive means including a first winding for rotating the element forward from the reset position upon a predetermined energization of the first winding and having electromagnetic drag means including a second winding for retarding the rotation of the element upon energization of the second winding, and an instantaneous overcurrent responsive relay having a third winding energized in series with said first winding and provided with switching means for energizing said second Winding only during the predetermined energization of the first winding to retard only forward rotation of the induction element.
  • a circuit breaker having tripping means including a movable induction element provided with means biasing the element to a reset position, a first means responsive to the current in the circuit for moving the element forward from the reset position to a tripping position when the current exceeds a predetermined value, a drag electromagnet interlinked with the induction element for retarding forward movement thereof upon energization of the drag electromagnet, and a second current responsive means interconnected with the first current responsive means for energizing the drag electromagnet only when the current exceeds the predetermined value thereby to produce a quick reset of the induction element when the current is reduced below the predetermined value.
  • a movable induction element having means for biasing the element to a reset position, electro-responsive means for moving said induction element forward from the reset position upon energization of the electro-responsive means in excess of a predetermined value, a non-directional retarding electromagnet interlinked with said induction element for retarding movement thereof upon energization of the electromagnet, and means for energizing said retarding electromagnet during excessive energization of said electroresponsive means and deenergizing said retarding electromagnet in response to the reduction of the energization of said electro-responsive means below said predetermined value thereby eliminating the effect of said retarding electromagnet on said induction element to permit a quick reset thereof.
  • a movable induction element biased to a reset position
  • electro-responsive means for moving said element forward from its reset position when energized in excess of a predetermined amount
  • a drag electromagnet energizable to retard movement of said element and means responsive to less than said predetermined amount of energization for maintaining said drag electromagnet deenergized.
  • An overcurrent relay for initiating tripping operation of an electric circuit breaker comprising, a movable induction element biased to a reset position, current responsive means effective when energized in response to circuit current having greater than a predetermined mag nitude to move said element forward from its reset position to a tripping position, an electromagnet coupled to said element to retard movement thereof when energized,

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US350584A 1953-04-23 1953-04-23 Quick reset induction time delay device Expired - Lifetime US2797369A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP76225457A JPS304368B1 (enrdf_load_stackoverflow) 1953-04-23 1953-04-15
US350584A US2797369A (en) 1953-04-23 1953-04-23 Quick reset induction time delay device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US350584A US2797369A (en) 1953-04-23 1953-04-23 Quick reset induction time delay device

Publications (1)

Publication Number Publication Date
US2797369A true US2797369A (en) 1957-06-25

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US350584A Expired - Lifetime US2797369A (en) 1953-04-23 1953-04-23 Quick reset induction time delay device

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US (1) US2797369A (enrdf_load_stackoverflow)
JP (1) JPS304368B1 (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2971131A (en) * 1956-12-19 1961-02-07 Gen Electric Protective relaying system for an electric power transmission circuit
US2985801A (en) * 1956-12-21 1961-05-23 English Electric Co Ltd Electrical time-overcurrent protective relays
US3036243A (en) * 1958-05-26 1962-05-22 Westinghouse Electric Corp Time delay induction relay with quick reset
US3105921A (en) * 1960-05-09 1963-10-01 Mc Graw Edison Co Quick reset induction disk relay
US3109962A (en) * 1960-07-26 1963-11-05 Westinghouse Electric Corp Time-delay devices

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1027440A (en) * 1911-07-28 1912-05-28 Allis Chalmers Time-element device.
GB337119A (en) * 1929-09-04 1930-10-30 Gen Electric Co Ltd Improvements in or relating to electric relays
US2619522A (en) * 1950-10-09 1952-11-25 Westinghouse Electric Corp Overcurrent relay with inverse time characteristic

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1027440A (en) * 1911-07-28 1912-05-28 Allis Chalmers Time-element device.
GB337119A (en) * 1929-09-04 1930-10-30 Gen Electric Co Ltd Improvements in or relating to electric relays
US2619522A (en) * 1950-10-09 1952-11-25 Westinghouse Electric Corp Overcurrent relay with inverse time characteristic

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2971131A (en) * 1956-12-19 1961-02-07 Gen Electric Protective relaying system for an electric power transmission circuit
US2985801A (en) * 1956-12-21 1961-05-23 English Electric Co Ltd Electrical time-overcurrent protective relays
US3036243A (en) * 1958-05-26 1962-05-22 Westinghouse Electric Corp Time delay induction relay with quick reset
US3105921A (en) * 1960-05-09 1963-10-01 Mc Graw Edison Co Quick reset induction disk relay
US3109962A (en) * 1960-07-26 1963-11-05 Westinghouse Electric Corp Time-delay devices

Also Published As

Publication number Publication date
JPS304368B1 (enrdf_load_stackoverflow) 1955-06-27

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