EP0403216A2 - Elektromagnetische Betätigungsanordnung - Google Patents

Elektromagnetische Betätigungsanordnung Download PDF

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Publication number
EP0403216A2
EP0403216A2 EP90306372A EP90306372A EP0403216A2 EP 0403216 A2 EP0403216 A2 EP 0403216A2 EP 90306372 A EP90306372 A EP 90306372A EP 90306372 A EP90306372 A EP 90306372A EP 0403216 A2 EP0403216 A2 EP 0403216A2
Authority
EP
European Patent Office
Prior art keywords
electromagnetic actuator
winding
energised
current
arrangement
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.)
Granted
Application number
EP90306372A
Other languages
English (en)
French (fr)
Other versions
EP0403216A3 (de
EP0403216B1 (de
Inventor
Colin Turner
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.)
Husqvarna UK Ltd
Original Assignee
Electrolux Outdoor Products Ltd
Electrolux Northern Ltd
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
Application filed by Electrolux Outdoor Products Ltd, Electrolux Northern Ltd filed Critical Electrolux Outdoor Products Ltd
Publication of EP0403216A2 publication Critical patent/EP0403216A2/de
Publication of EP0403216A3 publication Critical patent/EP0403216A3/de
Application granted granted Critical
Publication of EP0403216B1 publication Critical patent/EP0403216B1/de
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
    • 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
    • H01H71/2454—Electromagnetic mechanisms characterised by the magnetic circuit or active magnetic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection
    • H01H83/144—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection with differential transformer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay

Definitions

  • the present invention relates to electromagnetic actuator arrangements and relates particularly but not exclusively to residual current circuit breakers.
  • An object of the present invention is to provide an electromagnetic actuator arrangement which is faster-­acting and/or requires a less powerful electromagnet than comparable conventional actuator arrangements.
  • an electromagnetic actuator arrangement comprising an electromagnetic actuator, said electromagnetic actuator including at least one operating member of magnetically soft material which cooperates with biasing means and is magnetised when said electromagnetic actuator is energised, said arrangement further comprising means for reversing the magnetising force acting on said operating member on de-energising said electromagnetic actuator.
  • the invention is applicable particularly but not exclusively to circuit breakers and relays, which incorporate two such operating members, namely a fixed yoke and a movable armature.
  • the invention is also applicable for example to solenoids and other devices which incorporate only a single "operating member" of magnetically soft material.
  • the armature will be removed from the magnetic field of the winding by the biasing means by the time that the residual magnetic flux in the armature has been reversed by the reversal of magnetising force on de-energising the actuator.
  • the resulting force of attraction acting on the armature will accordingly be very weak in comparison with the opposing biasing force and the tripping time will not be adversely affected.
  • a particularly convenient way of limiting the reverse magnetisation is to reverse the magnetising force by means of a capacitor (which may for example by connected in parallel with the winding) which is arranged to discharge through the winding on de-­energisation of the actuator.
  • a capacitor which may for example by connected in parallel with the winding
  • the discharge is oscillatory so that the residual magnetisation of the armature is thereby reduced to a very low level.
  • the winding of the electromagnetic actuator is energised from a current force (preferably a substantially constant current source) and a gate-controlled semi-conductor switching device is arranged both to bypass current from said current source in response to a control signal applied to the gate of said device on de-energising said electromagnetic actuator, and to conduct the current which is discharged by said capacitor through said winding.
  • a current force preferably a substantially constant current source
  • a gate-controlled semi-conductor switching device is arranged both to bypass current from said current source in response to a control signal applied to the gate of said device on de-energising said electromagnetic actuator, and to conduct the current which is discharged by said capacitor through said winding.
  • Figure 1 is a circuit diagram of a residual current circuit breaker in accordance with the invention.
  • the circuit shown in Figure 1 comprises live (L) and neutral (N) mains input terminals which are connected via a two-pole switch SWl to mains output terminals, which may in turn be connected to an electrical appliance (not shown).
  • Switch SW1 is controlled by an electromagnetic actuator comprising a movable armature AR1 and a yoke Y1 which is provided with a winding L1.
  • Armature AR1 is mechanically linked to switch SWl and the latter is biased open by a tension spring SP which acts on the armature.
  • Armature AR1 and yoke Y1 are composed of magnetically soft iron and contact one another when switch SW1 is closed.
  • switch SW1 is closed manually and energised by a rectified constant current source comprising a series-connected diode D1, resistors R3, R4 and R5 and R6 and capacitor C6 (which are connected between the mains conductors) and resistor R2 (which is connected between the junction of R3 and C6 and one end of winding L1).
  • a rectified constant current source comprising a series-connected diode D1, resistors R3, R4 and R5 and R6 and capacitor C6 (which are connected between the mains conductors) and resistor R2 (which is connected between the junction of R3 and C6 and one end of winding L1).
  • winding L1 is connected to pin 6 of an RA3783 integrated circuit IC1 ad thence via pin 4 thereof to the free terminal of smoothing capacitor C6. Accordingly winding L1 is energised and maintains switch SWI ON.
  • a ferrite-core transformer T1 is coupled to the mains conductors and its output is fed to pins 2 and 3 of IC1.
  • the potential difference across pins 2 and 3 is monitored by IC1 and in the event that it exceeds a predetermined threshold value (as a result of an inbalance in the forward and return currents in the mains conductors due to a potentially dangereous leakage of current to earth) an output voltage is generated at pin 5.
  • a series-corrected discharge capacitator C1 and thyristor SCR1 are corrected in parallel with winding L1 and the gate of SCR1 is connected to pin 5.
  • the cathode of thyristor SCR1 is also connected to the negative terminal of capacitor C6 so that thyristor SCR1 bypasses the output current of the current source as well as providing a discharge path for capacitor C1 through winding L1.
  • the current from R2 is sufficient to hold SCR1 ON whilst capacitor C1 is discharging.
  • the circuit may be re-set by depressing switch SW1 manually.
  • a pair of test contacts TC are connected in series with a resistor R7 between the neutral output terminal and a live input terminal of the mains conductors to enable a residual current to be generated artificially in order to test the circuit.
  • the sensitivity of the circuit can be adjusted by altering the value of a resistor R8 which is connected across the winding of T1 or the value of resistor R1 which is connected between terminals 1 and 7 of IC1. It is by-passed by a noise suppression capacitor C4 and an additional noise-suppression capacitor C3 is connected between pins 1 and 8 of IC1. Resistor R8 is by-passed by a noise-suppression capacitor C5 and a noise-­suppression capacitor C2 is also connected between the gate and cathode of thyristor SCR1.
  • the circuit automatically switches switch SW1 OFF in the event of loss of mains supply.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Breakers (AREA)
  • Electromagnets (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
EP19900306372 1989-06-14 1990-06-12 Elektromagnetische Betätigungsanordnung Expired - Lifetime EP0403216B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8913633 1989-06-14
GB898913633A GB8913633D0 (en) 1989-06-14 1989-06-14 Electromagnetic actuator arrangement

Publications (3)

Publication Number Publication Date
EP0403216A2 true EP0403216A2 (de) 1990-12-19
EP0403216A3 EP0403216A3 (de) 1992-07-08
EP0403216B1 EP0403216B1 (de) 1994-08-24

Family

ID=10658400

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900306372 Expired - Lifetime EP0403216B1 (de) 1989-06-14 1990-06-12 Elektromagnetische Betätigungsanordnung

Country Status (8)

Country Link
EP (1) EP0403216B1 (de)
JP (1) JPH0395905A (de)
AU (1) AU624960B2 (de)
CA (1) CA2018965A1 (de)
DE (1) DE69011757T2 (de)
DK (1) DK0403216T3 (de)
ES (1) ES2057408T3 (de)
GB (1) GB8913633D0 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU673705B2 (en) * 1993-01-29 1996-11-21 H.P.M. Industries Pty Limited Fault detection circuit breaker
ITUB20169940A1 (it) * 2016-01-12 2017-07-12 Antonio Ricciardiello Dispositivo di interruzione circuitale

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE532028C (de) * 1929-05-27 1931-08-25 Siemens Schuckertwerke Akt Ges Schnellschalter
US3280375A (en) * 1963-01-17 1966-10-18 Ite Circuit Breaker Ltd Tripping device
US4063299A (en) * 1975-10-24 1977-12-13 Eagle Electric Mfg. Co. Inc. Magnetically latched ground fault circuit interrupter
GB2000379A (en) * 1977-06-27 1979-01-04 Weber Ag Fab Elektro Magnetic trip mechanism for automatic cut-out
EP0016458A1 (de) * 1979-03-26 1980-10-01 Fuji Electric Co. Ltd. Fehlerstromschutzschalter, der auch auf Gleichstromfehlerströme anspricht
GB2204199A (en) * 1987-05-02 1988-11-02 Ashley Accessories Ltd Residual current circuit breaker

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4442470A (en) * 1982-09-10 1984-04-10 Westinghouse Electric Corp. Ground fault receptacle with arrangement for protecting internal electronics
FR2604294B1 (fr) * 1986-09-23 1994-05-20 Merlin Et Gerin Disjoncteur differentiel multipolaire a assemblage modulaire
US4739293A (en) * 1987-02-19 1988-04-19 Westinghouse Electric Corp. Electromagnetic contactor with reduced noise magnetic armature

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE532028C (de) * 1929-05-27 1931-08-25 Siemens Schuckertwerke Akt Ges Schnellschalter
US3280375A (en) * 1963-01-17 1966-10-18 Ite Circuit Breaker Ltd Tripping device
US4063299A (en) * 1975-10-24 1977-12-13 Eagle Electric Mfg. Co. Inc. Magnetically latched ground fault circuit interrupter
GB2000379A (en) * 1977-06-27 1979-01-04 Weber Ag Fab Elektro Magnetic trip mechanism for automatic cut-out
EP0016458A1 (de) * 1979-03-26 1980-10-01 Fuji Electric Co. Ltd. Fehlerstromschutzschalter, der auch auf Gleichstromfehlerströme anspricht
GB2204199A (en) * 1987-05-02 1988-11-02 Ashley Accessories Ltd Residual current circuit breaker

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU673705B2 (en) * 1993-01-29 1996-11-21 H.P.M. Industries Pty Limited Fault detection circuit breaker
ITUB20169940A1 (it) * 2016-01-12 2017-07-12 Antonio Ricciardiello Dispositivo di interruzione circuitale
WO2017122142A1 (en) * 2016-01-12 2017-07-20 Ricciardiello Antonio Circuit breaker device

Also Published As

Publication number Publication date
EP0403216A3 (de) 1992-07-08
JPH0395905A (ja) 1991-04-22
CA2018965A1 (en) 1990-12-14
EP0403216B1 (de) 1994-08-24
GB8913633D0 (en) 1989-08-02
ES2057408T3 (es) 1994-10-16
DE69011757T2 (de) 1995-04-27
AU624960B2 (en) 1992-06-25
AU5700190A (en) 1990-12-20
DE69011757D1 (de) 1994-09-29
DK0403216T3 (da) 1995-01-02

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