US2636930A - Relay for controlling the supply of operating current to electromagnetically actuated devices - Google Patents

Relay for controlling the supply of operating current to electromagnetically actuated devices Download PDF

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Publication number
US2636930A
US2636930A US107441A US10744149A US2636930A US 2636930 A US2636930 A US 2636930A US 107441 A US107441 A US 107441A US 10744149 A US10744149 A US 10744149A US 2636930 A US2636930 A US 2636930A
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United States
Prior art keywords
relay
current
control
winding
power
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Expired - Lifetime
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US107441A
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English (en)
Inventor
Stevens Sydney Arthur
Duckitt Harry
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Siemens Mobility Ltd
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Westinghouse Brake and Signal Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/34—Self-interrupters, i.e. with periodic or other repetitive opening and closing of contacts

Definitions

  • This invention relates to relays for controlling the supply of operating current to electro-magnetically operated devices of the kind in which the supply of operating current efiected when the circuit for this current, closed when the control relay is energised, is arranged to be interrupted at a point other than the control relay contacts after a predetermined time interval.
  • the electro-magnetic energy stored in the device while the latter is supplied with operating current is arranged to be utilised, when the circuit of the device is interrupted, to effect a positive and rapid opening movement of the control relay contacts which are subsequently reclosed provided that the control relay continues to be energised.
  • control apparatus therein shown comprises a sensitive control relay I having an energising winding 2, a
  • the control relay l is arranged to control the supply of operating current to a power relay A from the terminals 5 of a power supply circuit through a front contact C of a normally energised slow release relay when the control relay 1 is energised, the relay C being normally energised from the terminals through a circuit ineluding a back contact A of the power relay A, this contact A being closed so long as the relay A is deenergised.
  • the control relay winding 2 is connected to the conductors 6 of a control circuit in series with an inductance l, a suitable condenser 8 being connected in parallel with the relay winding 2.
  • a relatively high resistance 9 is included in a conductor to extending as shown from one end of the inductance I to one of the terminals of the power relay A which is provided with a front contact A controlling the energising circuit of an electro-magnetically operated device (not shown) to be controlled.
  • the relay C is maintained energised from the supply terminals 5 through a circuit including the back contact A 2 of the power relay A, the front contact C of the relay C being thus closed.
  • a circuit for the operating winding of the power relay A is thus completed from the supply circuit terminals 5 through the closed contact C of the relay C and an additional or reinforcing current is at the same time supplied to the control relay winding 2 in parallel with the winding of the power relay A from the terminals 5 through conductor 10, the resistance 9 and the inductance 1 this additional current causing the element 3 of the control relay to be firmly maintained in its closed position against the contact 4.
  • the energisation of the control relay 1 eifects the interruption of the energising circuit of the slow release relay C which after the expiration of an interval of time releases its contact C and thereby breaks the energising circuit of the power relay A at this contact.
  • control current As soon as the transient current ceases the control current will return the element 3 of the control relay 1 into engagement with the contact 4 and this action will evidently occur after a short interval of time dependent upon the extent of the opening movement of the control relay element 3. If, therefore, the control current is relatively high, the extent of the opening movement above referred to will be relatively small and the return movement of the control relay element 3 will be completed after a relatively short time interval, If, on the'other hand, the
  • the operating circuit A is opened and closed, the openi 3 cuit being eiiected at the contact C of the slow release relay C while the duration of the closed period is constant and determined by the char acteristic of the slow release relay C.
  • the duration of the deenergised periods of the power relay A is, on the other hand, dependent upon the magnitude of the control current relative to the magnetic characteristics of the power relay.
  • the power relay A is arranged to control (through a circuit including a contact A of the relay A) a voltage or current regulator for a circuit in which it is desired to maintain substantially constant voltage or current conditions, the current energising the control relay i being arranged to be dependent upon the extent of the deviation in one direction of the voltage or current conditions in the circuit controlled by the regulator from a given standard value.
  • the duration of this time interval will be shorter when the voltage or current deviation from the standard value is greater so that the power relay will be re-energised more rapidly and the regulator will repeat its regulating action more promptly than if the deviation is smaller.
  • control relay is of the double contact type having a contact element 3 arranged to be moved into engagement with one or other of two fixed contacts H, l2 when the control relay l is energised by current in one direc tion or the other.
  • Two power relays A, B are provided the energising circuits of which each include a contact C of the slow release relay C, the windings of the two power relays being connected in series with one another to a source l3 of uni-directional current.
  • the source it comprises a full-wave rectifier is the out-put terminals lb of which are connected to the operating windings of the power relays A, B in series with one another, the input terminals E5 of the rectifier it being supplied with current from the secondary winding H of a transformer 58 the primary winding Q9 of which is connected to an alternating current circuit 29.
  • the energising coil 2 of the control relay l is connected through suitable resistances 2 l, 22 with the energising windings of both power relays A, B as clearly shown in the drawing.
  • the slow release relay C is normally maintained energised by uni-directional current from the output terminals i 5 of the rectifier Hi through a circuit including the normally closed contacts A and B of the power relays A and B. So long as the movable element 3 of the control relay l is not in engagement with either of the fixed contacts H, 52 the operating windings of the power relays A and B are connected in series with one another to the output terminals E5 of the rectifier through the normally. closed contact C of relay C but the current traversing this circuit is under these conditions insufficient to operat either of the power relays A and B. As a result the relay contacts A and Assuming that the element 3 is moved into engagement with the fixed contact 12, the operating winding of the relay B is short-circuited.
  • the closure of the relay contact A by the full energisation of the power relay A as above described causes the regulator to effect the desired voltage or current adjustment in tie circuit to be controlled and the opening of the relay contact A breaks the energising circuit of the relay C which accordingly releases after a time interval and opens the energising circuit of the relay A at the relay contact (2
  • the electro-magnetic energy stored in the power relay A is then utilised as in the apparatus of Figure l to cause a transient current to traverse the Winding 2 of the control relay 1 and thus to effect the prompt movement of the element 3 of the control relay away from its contact 82 as already described with reference to Figure 1.
  • the inductance l and the condenser 8 in the apparatus of Figures 1 and 2 serve as a smoothing device to prevent vibration of the movable element 3 of the control relay I this element being preferably arranged to have a relatively long natural time period of oscillation.
  • a suitable damping resistance may also if desired be connected in parallel with the energising coil 2 of the control relay l as indicated for example at 23 in Figure 2.
  • the operating circuit of the electro-magnetically operated device e. g. the energising circuit of the power relay A or B is arranged to be automatically interrupted after th expiration of a time interval (determined by the action of the slow release relay C) from the closure of this circuit under the action of the control relay i.
  • the actual operation of the electro-magnetically operated device when its operatin circuit is interrupted is arranged to be delayed for a predetermined interval of time so that in the event of a return movement of the control relay being completed within this period, the device will be re-supplied with operating current before its previous operation has ceased.
  • the device will not, under these conditions undergo any cessation in operation while if the duration of the time interval between the de-energisation of the device or of the power relay and its re-energisation is greater than the predetermined interval of time above referred to, the
  • the voltage regulator 24 is operated by an electric motor device 29 comprising motor windings to, ill to one or other of which current supplied to effect the operation of the motor device 29 in one direction or the other to raise or to lower the voltage applied to the primary windings of the main transformer 25 through the regulator 24.
  • the current supplied to the motor winding 39 or it is derived from the phase conductor B and the no *al conductor N of the alternating current supply circuit and this current supply is control). d by an intermediate polarised relay 32 having slow release characteristics.
  • the relay 32 comprises a movable element 33 arranged to engage with one or other of two ii" d contacts t l, 35 connected to the field winding-s 3! respectively and an energising winding terminals of the winding 35 are connected through the contacts A or B of the power relays A. and B to one terminal 3! of a suitable source of moi-directional current the other terminal 3% of which is connected to the mid-point 39 of the winding 36.
  • the control circuit conductors 6 are connected to the load conductors 2?, 28, this control circuit including a substantially constant adjustable source of uni-directional current constituted as indicated by a set of primary cells All.
  • the relay C is, in this form of apparatus, normally deenergised and is arranged to be supplied with energising current from the output terminals [5, of the rectifier M through the contact Al or B of the power relays Aor B when this relay is energised.
  • the operation of the apparatus of Figure 3 is similar to that of the apparatus of Figure 2 above described as regards the action of the control relay l and the power relays A and B.
  • the current traversing the winding 2 of the control clay I is, however, in the apparatus of Figure 3 dependent upon the difference between the voltage across the load conductors 2T, 28 and the voltage of the source it which constitutes an adjustable standard of reference. In the event therefore of the voltage across the conductors 2t, 28 rising above or falling below the voltage of the source it, current will traverse the control conductors t and the winding 2 of the control relay 8 in one direction or the other respectively, the magnitude of this current being dependent upon the magnitude of the dillerence between the voltage across the load conductors 21, 28 and that of the source 49.
  • phase e apparatus ugure 2 The operation of the voltage regulator 29 ill-- ore. a three-phase supply circuit the phase e apparatus ugure 2, is conone o "ectlon or the other being supplied to the winding of the relay 32 from the terminals through the contact A or B respectively of the power relays A or B when this relay is energised.
  • the intermediate relay 32 has slow release characteristics so that when this relay is deenergised by the action of the power relay A or B, the intermediate relay 32 is not operated to cause the regulator 24 to cease operation until the release period of the intermediate relay 32 has expired.
  • the interval of time between the opening and reclosure of the control relay I may be less than the release period of the intermediate relay 322 so that the latter, under these conditions, will not release before it is re-energised and there will consequently be no cessation in the operation of the regulator 24.
  • the duration of the time intervals during which the regulator 24 is rendered inoperative will evidently depend upon the cliiierence between the duration of the interval between the opening and reclosure oi the sensitive control relay I and the release period of the intermediate relay 32 so that the duration of the periods during which the regulator 24 is inoperative, will vary from zero to an indefinitely large value.
  • the power relay A or B is intermittently energised and deenergised, the operation of the regulator 24 is only intermittent for control currents in the sensitive relay I of below a predetermined value the durations of the inoperative periods of the regulator 24 increasing as the control current decreases until eventually the regulator is continuously inoperative.
  • a circuit arrangement for controlling the ,operation of a relay in accordance with the value of a variable comprising in combination, a variable voltage direct current power supply; a substantially constant voltage direct current power supply; a direct current control relay having an operating winding; a first contact closed by said control relay when and only when said operating winding is energized with direct current of one polarity; a first energizing circuit connecting saidopera'ting winding of said control relay to said variable voltage power supply, whereby controlled by the'power ntermediate relay 32, current in assesso said'operating winding is energized with direct current of said one polarity; a direct current power relay having an operating winding; circuit means connecting said power relay operating winding in parallel with said first energizing circuit across said variable voltage power supply, said circuit having sufficient resistance to prevent current from said variable voltage power supply operating said power relay; a second contact; a second energizing circuit including, in series, said-energizing winding of said power relay, said first contact, said second contact and
  • a variable voltage direct current power supply for controlling the operation of a relay in accordance with the value ofa variable, comprising in combination, a variable voltage direct current power supply; a substantially' constant voltage direct current power supply; a direct current control'relay having an operating'winding; a first contact closed by said control relay when and only when said operating winding is'energized with direct current of one polarity; a first energizing circuit connecting said operating winding of said control relay to said variable voltage power supply, whereby saidoperating winding is energized with direct current of said one polarity; a direct current power relay'having an operating winding; circuit means connecting said power relay operating winding in parallel with said first energizing circuit across said variable voltage power supply; a second contact, operated by said power relay and closed when said operating winding of said power re-- lay is de-energized; a slow acting relay having an operating winding; a second energizing circuit including said second contact and connecting said slow acting relay to said constant voltage power supply; a third
  • a circuit arrangement for controlling the selective operation of two relays in accordance with the value of a variable comprising in combination, a first direct current power supply the voltage and polarity of which depend upon the variable; a second direct current power supply having a substantially constant voltage; a direct current control relay having an operating winding; a first energizing circuit connecting said operating winding of said control relay to said first direct current power supply; a first control contact closed when and only when said control relay operating winding is energized by current of normal polarity; a second control contact closed when and only when said control relay operating winding is energized by current of reverse polarity; a first power relay having an operating winding; a second power relay having an operating winding; a second energizing circuit including said first control contact con.
  • a third energizing circuit including said second control contact connecting said second power relay operating winding to said second direct current power supply; contact means included in said second and third energizing circuits closed when both said power relays are de-energized and adapted to be opened a predetermined time after the energization of either of said power relays; and means operative when said second and third energizing circuits are opened for discharging energy stored in one of said power relays through said control relay operating winding as current of a polarity opposite to that of the current flowing in said first energizing circuit.
  • first direct current power supply of substantially constant voltage
  • first power relay and a second power relay each having an operating winding respectively
  • a series circuit including said operating windings and connected across said first direct current power supply
  • a circuit arrangement comprising in combination, a first direct current power supply of substantially constant voltage; a first power relay and a second power relay, each having an operating winding respectively; a series circuit including said operating windings and connected across said first direct current power supply, the resistance of said series circuit limiting the current therethrough to value insufficient to operate either one of said power relays; a second direct current power supply the voltage and polarity of which depend upon a variable; a direct current control relay having an operating winding; an energizing circuit connec 'ng said control relay operating winding across said second direct current power supply; circuit means connecting said control relay operating winding in parallel with both said power relay operating windings, said circuit means having sufiicient resistance.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Direct Current Feeding And Distribution (AREA)
  • Relay Circuits (AREA)
US107441A 1948-08-13 1949-07-29 Relay for controlling the supply of operating current to electromagnetically actuated devices Expired - Lifetime US2636930A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB21405/48A GB646901A (en) 1948-08-13 1948-08-13 Improvements relating to circuit arrangements for the control of a direct current relay

Publications (1)

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US2636930A true US2636930A (en) 1953-04-28

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US107441A Expired - Lifetime US2636930A (en) 1948-08-13 1949-07-29 Relay for controlling the supply of operating current to electromagnetically actuated devices

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US (1) US2636930A (enrdf_load_stackoverflow)
GB (1) GB646901A (enrdf_load_stackoverflow)
NL (2) NL147787B (enrdf_load_stackoverflow)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2189846A (en) * 1936-08-05 1940-02-13 Jean Francois Augier Queyras Automatic relay control system
US2279849A (en) * 1940-05-16 1942-04-14 Gen Electric Control of electromagnetic devices
US2393060A (en) * 1943-12-11 1946-01-15 Westinghouse Electric Corp Control system
US2445450A (en) * 1943-06-11 1948-07-20 Westinghouse Electric Corp Electrical induction apparatus
US2489017A (en) * 1948-02-26 1949-11-22 Bell Telephone Labor Inc Control circuit for slow-releasing relays
US2515968A (en) * 1947-05-07 1950-07-18 Bendix Aviat Corp Pulse length measurement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2189846A (en) * 1936-08-05 1940-02-13 Jean Francois Augier Queyras Automatic relay control system
US2279849A (en) * 1940-05-16 1942-04-14 Gen Electric Control of electromagnetic devices
US2445450A (en) * 1943-06-11 1948-07-20 Westinghouse Electric Corp Electrical induction apparatus
US2393060A (en) * 1943-12-11 1946-01-15 Westinghouse Electric Corp Control system
US2515968A (en) * 1947-05-07 1950-07-18 Bendix Aviat Corp Pulse length measurement
US2489017A (en) * 1948-02-26 1949-11-22 Bell Telephone Labor Inc Control circuit for slow-releasing relays

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Publication number Publication date
GB646901A (en) 1950-11-29
NL147787B (nl)
NL74431C (enrdf_load_stackoverflow)

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