EP0320929A2 - Vorrichtung zur Auslösung der Kontakte von Diffenrentialschaltern - Google Patents

Vorrichtung zur Auslösung der Kontakte von Diffenrentialschaltern Download PDF

Info

Publication number
EP0320929A2
EP0320929A2 EP88120979A EP88120979A EP0320929A2 EP 0320929 A2 EP0320929 A2 EP 0320929A2 EP 88120979 A EP88120979 A EP 88120979A EP 88120979 A EP88120979 A EP 88120979A EP 0320929 A2 EP0320929 A2 EP 0320929A2
Authority
EP
European Patent Office
Prior art keywords
lever
arm
release
knob
spring
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.)
Withdrawn
Application number
EP88120979A
Other languages
English (en)
French (fr)
Other versions
EP0320929A3 (de
Inventor
Raffaello Monterosso
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.)
ABB Elettrocondutture SpA
Original Assignee
Elettrocondutture SpA
ABB Elettrocondutture SpA
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 Elettrocondutture SpA, ABB Elettrocondutture SpA filed Critical Elettrocondutture SpA
Publication of EP0320929A2 publication Critical patent/EP0320929A2/de
Publication of EP0320929A3 publication Critical patent/EP0320929A3/de
Withdrawn legal-status Critical Current

Links

Images

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
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/505—Latching devices between operating and release mechanism
    • 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
    • H01H83/02—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents
    • H01H83/04—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents with testing means for indicating the ability of the switch or relay to function properly
    • 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
    • H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
    • H01H83/22—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages
    • 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
    • H01H83/02—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents
    • H01H83/04—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by earth fault currents with testing means for indicating the ability of the switch or relay to function properly
    • H01H2083/045—Auxiliary switch opening testing circuit in synchronism with the main circuit
    • 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
    • H01H71/1072—Release mechanisms which are reset by opening movement of contacts

Definitions

  • the present invention relates to a release device for opening the contacts of an electric switch upon a differential current exceeding a given threshold in the electric system.
  • differential switches which are normally constituted by a movable-contact switch associated with a differential current detector
  • release device which, as it has to be actuated by a very weak signal, must be very sensitive and therefore cause release forces and strokes having a limited value.
  • Said release device is normally constituted by a conveniently guided pin or small piston, which is actuated with a preset translatory stroke when differential currents are detected in the electric system by a detection device inserted therein. During its stroke, the release piston transmits the release to a mechanism which causes the opening of the contacts of the switch.
  • the aim of the present invention is to provide a release device, insertable in a differential switch, structured so that under the action of the release pin it is capable of transmitting a conveniently amplified release force and stroke to the conventional release lever provided in the switch, thus causing the safe opening of the contacts.
  • Another object of the invention is to provide a release device which is safely reliable, can be reset after each intervention, has small dimensions and a modest cost.
  • Not least object is to provide a release device of the above described type, structured so as to have an adjustable stroke and therefore suitable for opening the contacts of different types of electric switches.
  • the device comprises a supporting frame (not illustrated for the sake of clarity) substantially having the form of a U-shaped body between the opposite walls whereof various actuation lever systems, a cylindrical spring and a knob are pivoted.
  • the release device in the reset position of figure 1, comprises a knob 1 for manual resetting the device after each release, which knob is freely pivoted on a pivot 2 rigidly associated with the two opposite walls of the frame.
  • a cylindrical helical spring 3 coiled on a pivot 4 parallel to the pivot 2 of the knob, and one end 3a of said spring is intended to be pushed outwards and tensioned by a lever rigidly associated with the knob, as will become apparent hereinafter; the opposite end of the spring 3 is folded to an arc 3b and is intended to enter a recess 5 provided peripherally to the knob 1, after the release of the device, as will also become apparent hereinafter.
  • an oscillating lever element is mounted about a pivot 6 and has three mutually angularly spaced arms 7-7a-7b; the arm 7 is arranged so as to have its end 7c at a short distance from an ordinary release device 8, of the vertically translatable piston or pin type, actuated by a differential current detector device.
  • the stroke of the release piston 8 according to the arrow A (figure 1), due to a differential current in the electric circuit, is such as to cause a downward rotation of the lever 7 which rotates the arm 7a according to the arrow 8.
  • the arm 7b of the oscillating lever is directed towards the curved part 3b of the spring 3 and has, at its end, a resting element 9 intended to be moved, according to the arrow C, when the device is reset, i.e. after the action of the release device 8 on the lever arm 7, while, upon the release, said element 9 is moved according to the arrow D.
  • oscillating element 10 Coaxially to the oscillating lever with three arms 7-­7a-7b there is pivoted another oscillating element 10, having the shape of a triangular plate or the like, one side whereof is arranged in contact with the end 7d of the arm 7a, while the opposite side ends with a step 10a which has the function of retaining, when the device is reset, the end of a lever which substantially constitutes the means for retaining the device in a set position (figure 1).
  • This retention or latching lever is constituted by two arms 11-11a, arranged at an angle to each other and pivoted to the supporting frame at 11d.
  • the arm 11 has, at its free end, a step 11b shaped so that it can engage the step 10a of the lever 10 and can be freely released following a rotation of the lever 10 caused by the arm 7a due to the lowering of the arm 7 according to the arrow A.
  • Another arm 11e of the retention lever is pivoted to the end of the arm 11a and is directed towards the arc-­shaped part 3b of the spring, its end 11c is arranged in contact, always with the device in reset position (figure 1), with a lever associated with the knob; this lever is constituted by an element with three arms 12-12a-­12b which are coaxial to the knob 1 and angularly spaced so that the arm 12a has its end in contact with the end 3a of the spring, that the arm 12 is in contact with the end 11c of the lever 11e and that the arm 12b can open an electric test circuit which will be explained hereinafter.
  • a release connecting rod 13 is pivoted to the free end 12c of the arm 12 and has such a length and is guided so as to have its free end 13a proximate to the ordinary release lever 14 of a mechanism for opening the contacts of a switch, after each intervention of the release device 8 on the lever 7.
  • the lever 14 is pivoted to the frame at 14a.
  • a connecting rod 15 which has the purpose of guiding and then keeping in stable position the arm 11e when the device is reset as in figure 1 and then rotating said arm 11e upwards after each actuation of the release device 8 (figure 2).
  • the arm 7b is moved clockwise, moving its resting pin 9 according to arrow D into contact with the inner arc of the curved end 3b of the spring 3 (figure 2). Meanwhile the knob rotates anticlockwise, as the connecting rod 15 has moved from the position of figure 1 to the position of figure 2 and therefore its rotation about the axis 2, on which a return spring (not shown) is provided, is no longer prevented.
  • an auxiliary test circuit actuatable by means of a button 16 according to the arrow F, is associable with the release device for differential switches as described above.
  • Said test circuit has a circuit including two conductors 17-17a. with power supply through an adapted resistor 18, the ends of the conductors being connected to two cylindrical taps 19-19a; a spring is wound around the tap 19 and acts as flexible conductor 20 which, by means of the pushbutton 16, pressed according to the arrow F, can be elastically moved to the position 20a (figure 1), while a portion of flexible conductor is in contact with tap 19a and comprises a spring wound around a cylindrical body 21 which ends with two protruding ends 22 and 22a, the one 22a being in contact with tap 19a.
  • the end 22a of the conductor in contact with tap 19a is arranged so that it can be spaced, i.e. disconnected, from tap 19a, by the arm 12b which is rigidly associated with the knob, so as to cutoff the test circuit regardless of the time for which the button 16 is kept closed.
  • test circuit since the purpose of the test circuit is to cause the intervention of the release device 8 by simulating the flow of a differential current for an extremely short time, by pressing the button 16 according to the arrow F, the end of the conductor 20 is caused to move into contact with the conductor 22 and both conductors mutually in contact are caused to move further, as indicated by the reference numerals 22b-22a in the figures.
  • test circuit is thus closed and the release device 8 is accordingly actuated, causing the opening of the contacts of the switch.
  • the configuration of the mechanism is the one of figure 3 (and of figure 2) and in particular the arm 12b has raised the end 22a, removing it from contact with tap 19b and thus interrupting the flow of current in the test circuit.
  • This in practice avoids damage to the resistor 18 which, for reasons of space and cost, can thus be dimensioned, for thermal purposes for a much smaller dissipatable power than the one required if the flow of current in the circuit were prolonged, i.e. independently from the fact that the button 16 is kept pressed for a long time or not.
  • the release rod 13 which causes the release of the lever 14 of the contact opening mechanism with its stroke and its pushing force, is stably associated only at one end (i.e. at the end 12c of the arm 12), it is possible and easy to replace it with other rods having different shapes and lengths, adapted for the release of other kinds of known switches.

Landscapes

  • Push-Button Switches (AREA)
  • Mechanisms For Operating Contacts (AREA)
EP88120979A 1987-12-17 1988-12-15 Vorrichtung zur Auslösung der Kontakte von Diffenrentialschaltern Withdrawn EP0320929A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT23069/87A IT1223520B (it) 1987-12-17 1987-12-17 Dispositivo per lo sgancio dei contatti di interruttori differenziali
IT2306987 1987-12-17

Publications (2)

Publication Number Publication Date
EP0320929A2 true EP0320929A2 (de) 1989-06-21
EP0320929A3 EP0320929A3 (de) 1990-08-29

Family

ID=11203451

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88120979A Withdrawn EP0320929A3 (de) 1987-12-17 1988-12-15 Vorrichtung zur Auslösung der Kontakte von Diffenrentialschaltern

Country Status (2)

Country Link
EP (1) EP0320929A3 (de)
IT (1) IT1223520B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0456586A1 (de) * 1990-05-10 1991-11-13 Merlin Gerin Testschaltung für einen Differentialauslöser
EP4550381A1 (de) * 2023-10-31 2025-05-07 Xiamen Hongfa Automotive Electronics Co., Ltd. Testmechanismus mit doppeltem bruchpunkt für schutzschalter und schutzschalter

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR77263E (fr) * 1960-02-29 1962-02-09 Prec Mecanique Labinal Perfectionnements apportés aux appareils de protection, plus spécialement pour installations en triphasé
DE1286187B (de) * 1964-04-18 1969-01-02 Licentia Gmbh Verklinkungsmechanismus fuer Ausloeser von Selbstschaltern
DE3107687C2 (de) * 1981-02-28 1985-05-09 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Mechanismus für einen mit einem Leitungsschutzschalter kombinierten Fehlerstromauslöser

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0456586A1 (de) * 1990-05-10 1991-11-13 Merlin Gerin Testschaltung für einen Differentialauslöser
FR2662019A1 (fr) * 1990-05-10 1991-11-15 Merlin Gerin Circuit test pour un declencheur differentiel.
EP4550381A1 (de) * 2023-10-31 2025-05-07 Xiamen Hongfa Automotive Electronics Co., Ltd. Testmechanismus mit doppeltem bruchpunkt für schutzschalter und schutzschalter

Also Published As

Publication number Publication date
IT1223520B (it) 1990-09-19
IT8723069A0 (it) 1987-12-17
EP0320929A3 (de) 1990-08-29

Similar Documents

Publication Publication Date Title
US4641001A (en) Circuit interrupter
ZA925490B (en) Switch mechanism
GB1288716A (de)
US3742403A (en) Circuit breaker with on off and trip indication
GB1461217A (en) Circuit breaker
GB1326186A (en) Circuit breaker with on off and trip indication
JPH04507168A (ja) 回路遮断器
EP0320929A2 (de) Vorrichtung zur Auslösung der Kontakte von Diffenrentialschaltern
GB719409A (en) Automatic electrical circuit-breakers
JPH0259579B2 (de)
GB2161022A (en) Circuit interrupter
US5192941A (en) Overcurrent trip switch
US2558908A (en) Circuit breaker switch
US5408208A (en) Electrically tripped mechanism for knife blade switches
EP0914666B1 (de) Kinematisches system zur ansteuerung des beweglichen kontaktes für einen automatischen lastschalter
US4686599A (en) Motor protection switch
US2673267A (en) Electric circuit breaker
US3244835A (en) Magnetic tripped circuit breaker
GB1515749A (en) Manually operable circuit interrupter with automatic current overload protection
US3943567A (en) Ejection device for tape cartridge
US3806846A (en) Pushbutton reset undervoltage release device
US3430164A (en) Circuit breaker mechanism
US2760028A (en) Circuit breakers
NO853152L (no) Sikkerhetsbryter.
CA1076176A (en) Toggle lever switching mechanism for an automatic switching apparatus including a low-voltage tripping device

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19901215

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ABB ELETTROCONDUTTURE S.P.A.

17Q First examination report despatched

Effective date: 19930408

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19930819