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EP0305321B1 - Déclencheur magnétique pour disjoncteur - Google Patents

Déclencheur magnétique pour disjoncteur Download PDF

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Publication number
EP0305321B1
EP0305321B1 EP19880730191 EP88730191A EP0305321B1 EP 0305321 B1 EP0305321 B1 EP 0305321B1 EP 19880730191 EP19880730191 EP 19880730191 EP 88730191 A EP88730191 A EP 88730191A EP 0305321 B1 EP0305321 B1 EP 0305321B1
Authority
EP
European Patent Office
Prior art keywords
armature
tripping
winding
magnet
permanent magnet
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
EP19880730191
Other languages
German (de)
English (en)
Other versions
EP0305321A1 (fr
Inventor
Donald R. Boyd
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0305321A1 publication Critical patent/EP0305321A1/fr
Application granted granted Critical
Publication of EP0305321B1 publication Critical patent/EP0305321B1/fr
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
    • H01H71/32—Electromagnetic mechanisms having permanently magnetised part
    • H01H71/321—Electromagnetic mechanisms having permanently magnetised part characterised by the magnetic circuit or active magnetic elements
    • H01H71/322—Electromagnetic mechanisms having permanently magnetised part characterised by the magnetic circuit or active magnetic elements with plunger type armature
    • 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
    • H01H71/26—Electromagnetic mechanisms with windings acting in opposition
    • 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
    • H01H71/1054—Means for avoiding unauthorised release

Definitions

  • the invention relates to a tripping magnet for a circuit breaker, with an armature and an actuating rod and with a permanent magnet for holding the armature in the rest position against the action of a storage spring biasing the armature into a tripping position and with a main winding for at least temporarily influencing the magnetic field of the permanent magnet in this way that the armature can be moved into the release position, and with a control device for amplifying the magnetic flux holding the armature in the rest position.
  • a trigger magnet of this type has become known, for example, from EP-A-0 121 963. If a circuit breaker provided with a tripping magnet is to be tripped, the main winding is excited in such a way that the effect of the permanent magnet on the armature is canceled or vice versa and the armature is thereby torn from the permanent magnet by the storage spring. The actuating rod then abuts against a locking part which opens the latching device of the circuit breaker and thereby separates the switch contacts.
  • a trigger magnet with an armature and an actuating rod and with a permanent magnet is also known from US-A-4 641 117.
  • the tripping magnet can be optionally equipped with two coils and a permanent magnet to combine the functions of a shunt release and an undervoltage release in a single device.
  • an electromagnetically actuated contactor has become known from US-A-4 078 219, the actuating magnet of which has an auxiliary winding through which the main current flows when it flows over the arcing horns.
  • the contacts of the contactor should be kept closed in the event of an overcurrent, even if the normal holding current of the actuating magnet is missing.
  • the control device provided in the trigger magnet mentioned at the outset serves to avoid faulty trips which can be caused by mechanical shocks, vibrations or virbrations.
  • the problem of accidental triggering of the circuit breaker due to the magnetic fields generated by the high load alternating current of the circuit breaker, which, for. B. can be 85000 A.
  • the magnetic field of the main current paths of the circuit breaker is able to influence the tripping magnet because it is arranged in close proximity to the main current paths. This magnetic field is able to tear off the armature with the actuating rod from the permanent magnet in the same way as happens when the main winding of the trigger magnet is excited.
  • a known way of avoiding unintentional tripping by an external magnetic field is to shield the main winding of the tripping magnet from the magnetic field caused by the load current of the circuit breaker.
  • this solution is accompanied by an increase in the release magnet and a corresponding increase in the manufacturing costs. If the load current of the circuit breaker is very high and the distance between the main current paths and the tripping magnet is particularly small, the shielding may also prove ineffective or not feasible.
  • the object of the invention is to create a trigger magnet which is insensitive to external magnetic fields.
  • a further auxiliary winding arranged coaxially to the main winding is provided and in that the control device serves to feed the auxiliary winding in the sense of increasing the action of the permanent magnet on the armature, and in that it also serves as a detection coil for the load current of the main circuit breaker serving a voltage signal inductively caused by the load current can be removed for the control device.
  • the auxiliary winding improves the operation of the tripping magnet in such a surprising manner that the additional effort can be regarded as low. This is because the auxiliary winding can be excited continuously or only when the magnetic flux caused by the main winding is so strong that the armature could be moved into the release position.
  • An advantageous construction of the tripping magnet can be achieved in that the main winding and the auxiliary winding are arranged on a common coil former, which has an internally threaded tubular winding core and shoulder parts for delimiting the winding space, whereby the winding core forms a flange part over which a shoulder part protrudes. This is not only the easiest way of producing the windings, but also the easiest way to achieve the desired linkage of the magnetic fluxes within the release magnet.
  • the tripping magnet can have a pole head with an end plate and a tubular part, the pole head having an inner bore for guiding the armature and a threaded outer surface for receiving in the tubular winding core of the coil former, and furthermore having a pole base with an end plate and a tubular part External threads can be provided for fastening in the internal thread of the coil body.
  • the pole foot and the armature can each have an inner bore for receiving the storage spring, and the pole foot and the armature can also each have a further inner bore for guiding or receiving the actuating rod.
  • the storage spring surrounds the actuating rod and is received in the inner bore of the armature and the pole foot. It is therefore completely protected against external influences, which means that its properties are maintained over a longer period of time.
  • a disk can be provided which rests on the flange part of the coil body; Furthermore, means for connecting the actuating rod and the armature and a partially shielding shielding cylinder enclosing the coil arrangement can be provided.
  • This shielding cylinder only needs to have relatively small dimensions, since its effect is significantly enhanced by the auxiliary winding.
  • the release magnet 10 shown in Figures 1 to 5 comprises an armature 12, a permanent magnet 14, a release unit 16 with an auxiliary winding 18 and a main winding 20, a bore 42 for guiding the armature, a control device 22, an actuating rod 28 as a means of connection of the armature with the circuit breaker, a coil body 24 and a storage spring 26.
  • the armature 12 contains an opening 30 in which the actuating rod 28 is fastened.
  • the actuating rod 28 is fastened in the bore 30 by means of a pin 32 which is pressed through the actuating rod 28 and the armature 12.
  • the armature 12 also contains a bore 34 for lateral support of the storage spring 26.
  • the storage spring 26 exerts its force on the armature 12 on a shoulder surface 36 From bore 34, which is formed at the transition to the bore 30. This force acts on the armature 12 and the actuating rod 28 in the direction of the release position.
  • the means for guiding the armature 12 comprise a pole head 38.
  • the pole head 38 comprises an end plate 40, an inner bore 42 and an outer surface 44 with a threaded part 46.
  • the inner bore 42 is dimensioned such that the armature 1 is freely rectilinear within the inner bore 42 can move.
  • the windings 18 and 20 are wound on a bobbin 24 which has a first shoulder part 52, a second shoulder part 54 and a tubular winding core 56.
  • the main winding 20 is wound on the winding core 56 and separated from the auxiliary winding 18 by an intermediate layer 50 made of an insulating material.
  • the auxiliary winding 18 is wound over the main winding 20.
  • the tubular winding core 56 comprises a threaded part 58, which is provided for receiving the threaded part 46 of the pole head 38 and the threaded part 70 of a pole foot 64.
  • the shoulder part 54 of the bobbin 24 is attached to the winding core 56 in such a way that a flange part 60 is formed at one end of the bobbin 24.
  • the flange part 60 centers a disk 62 between the permanent magnet 14 and the second shoulder part 54 of the coil body 24.
  • the pole base 64 guides the actuating rod 28, supports the storage spring 26 laterally and centers the permanent magnet 14.
  • the pole base 64 comprises an end plate 66 and a cylindrical extension 68 with an outer threaded part 70.
  • the pole base 64 also contains a bore 72 for receiving the storage spring 26
  • the reaction force of the force exerted by the storage spring 26 acts on the shoulder surface 74 at the transition between a bore 69 and the bore 72 which is adapted to the actuating rod 28
  • Screws 78 are provided for fastening the trip coil 10 within the circuit breaker, not shown.
  • the end plate 66 also serves as a stop for the stop nut 80 attached to the actuating rod 28.
  • a first shielding cylinder 82 and a second shielding cylinder 84 for shielding the release unit 16 are shown in FIGS. 1 to 4. These serve to shield the coil unit 16 against external magnetic fields and also serve to protect the components of the trigger coil against environmental influences.
  • the coil body 24 is fastened to the pole head 38 by means of the threaded parts 46 and 58 of the pole head 38 and the coil body 24.
  • the shielding cylinder 82 is then pushed over the shoulder parts 52 and 54 of the coil body 24, and the disk 62 is centered on the flange part 60 of the coil body 24.
  • the permanent magnet 14 is centered on the pole base 64, and the pole base 64 is then fastened within the coil body 24 by means of the threaded parts 70 and 58 of the pole base 64 and the coil body 24.
  • the shielding cylinder 84 is then pushed over the end plates 40 and 66 of the pole head 38 and the pole foot 64 and fastened in the intended position by fastening means, not shown.
  • the armature 12 and the actuating rod 28 are connected together by the pin 32 and inserted within the inner bore 42 of the pole head 42 after the storage spring 26 has been inserted within the bore 72 of the pole base 64.
  • the armature 12 is arranged within the inner bore 42 so that the stop nut 80 can be attached to the actuating rod 28.
  • a single line schematically indicates the connection of the windings 18 and 20 to the control device 22.
  • the circuit shown in FIG. 6 can be used to feed the windings 18 and 20 and to control the position (rest position or released) of the armature 12 for the purpose of tripping the circuit breaker will.
  • the auxiliary winding 18 is fed.
  • the main winding 20 is fed (the windings 18 and 20 are indicated schematically in FIG. 6).
  • FIGS. 3 and 4 show the mode of operation of the release magnet 10 in the rest position with the tension spring 26 tensioned, while FIG. 4 shows the armature 12 in the release position with the tension spring 26 relaxed.
  • the armature 12 and the actuating rod 28 are moved into the rest position by the magnetic flux of the permanent magnet 14 and the magnetic flux which may be generated when the auxiliary winding 18 is fed, and are held in this prestressed position.
  • the auxiliary winding 18 can be referred to as an amplifier coil because it increases or increases the magnetic flux of the permanent magnet 14.
  • the magnetic flux generated by the auxiliary winding 18 is important because it assists the permanent magnet 14 in holding the armature 12 in the rest position when an opposing magnetic flux is caused by the main winding 20 or the load current of the circuit breaker.
  • the auxiliary winding 18 can be constantly excited or it can only be excited when the magnetic flux generated by the permanent magnet 14 is insufficient to hold the armature 12 in the rest position with the prestressed storage spring 26. An opposite magnetic flux can occur due to the load current of the circuit breaker.
  • the shielding cylinders 82 and 84 serve to shield the main winding 20 against part of the magnetic flux caused by the load current of the circuit breaker.
  • these shields cannot be made this way that they completely shield the main winding 20 against the leakage flux.
  • the permanent magnet 14 can not be made so much stronger that the opposing magnetic fluxes of the main winding 20 and the load current are overcome, since a larger main winding 20 would then be required to tear the armature 12 from the permanent magnet 14 when the trigger magnet 10 Circuit breaker should trip.
  • the armature 12 and the actuating rod 28 are moved into the release position when the auxiliary winding 18 is de-energized and the main winding 20 is energized.
  • the main winding 20 acts in the excited state as a magnetic flux displacement coil and generates a magnetic flux which is sufficiently large to shift the magnetic flux in the release magnet 10 in such a way that the armature 12 is torn off by the permanent magnet 14.
  • the auxiliary winding 18 can be energized in the sense that a magnetic flux is generated in substantially the same direction as that of the main winding 20.
  • the storage spring 26 also supports the transfer of the armature 12 into the release position.
  • the main winding 20 also serves to generate a feedback signal for the control device 22.
  • the magnetic flux caused by the load current of the circuit breaker generates a current in the main winding 20. Since this current is a function of the load current, the control device 22 can detect this current.
  • the dimensions and the materials used to manufacture the release magnet can be selected according to the requirements and the known principles of technical constructions.
  • the pole head 38 and the armature 12 can be made of cold-rolled steel, which is electrolessly coated with a non-magnetic nickel-phosphorus layer.
  • the pole base 64, the disk 62 and the shield 82 are made of cold-rolled steel with a zinc coating.
  • the permanent magnet 14 consists of a ceramic material. Colorless nylon is suitable for producing the bobbin 48.
  • For the coil unit 16 about 800 turns of an insulated wire are used to produce the main winding 20, and about 400 turns of an insulated wire are used to produce the auxiliary winding 18.
  • Actuating rod 28 and shield 84 are made of an aluminum alloy called 6061-T6.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)

Claims (5)

  1. Aimant de déclenchement (10) pour un sectionneur de puissance, comportant une armature (12) et une tige d'actionnement (28) ainsi qu'un aimant permanent (14) servant à retenir fermement l'armature (12) dans la position de repos à l'encontre de l'action d'un ressort accumulateur (26) qui charge l'armature (12) dans la position de déclenchement, et un enroulement principal (20) servant à influer au moins temporairement sur le champ magnétique de l'aimant permanent (14) de sorte que l'armature (12) peut être amenée dans la position de déclenchement, ainsi qu'un dispositif de commande (22) servant à amplifier le flux magnétique maintenant l'armature (12) dans la position de repos,
    caractérisé par le fait qu'il est prévu un second enroulement auxiliaire (18) disposé coaxialement par rapport à l'enroulement principal (20), et que le dispositif de commande (22) sert à alimenter l'enroulement auxiliaire (18) dans le sens d'une amplification de l'action de l'aimant permanent (14) sur l'armature (12), et qu'un signal de tension, produit inductivement par le courant de charge, pour le dispositif de commande (22) peut être tiré de l'enroulement principal (20) qui est utilisé simultanément comme bobine de détection pour le courant de charge de ce sectionneur.
  2. Aimant de déclenchement suivant la revendication 1, caractérisé par le fait que l'enroulement principal (20) et l'enroulement auxiliaire (18) sont disposés sur un même corps de bobine (24) qui possède un noyau tubulaire de bobinage (56), pourvu d'un taraudage (58), ainsi que des parties formant épaulements (52,54) pour limiter l'espace de bobinage, le noyau de bobinage (56) faisant saillie au-delà d'une partie formant épaulement, en formant un élément de bride (60).
  3. Aimant de déclenchement suivant la revendication 1 ou 2, caractérisé par le fait qu'il est prévu une tête polaire (38) possédant une plaque terminale (40) et un élément tubulaire, la tête polaire (38) possédant un perçage intérieur (42) pour guider l'armature (12) et une surface extérieure (44) pourvue d'un filetage (46) et destinée à être logée dans le noyau tubulaire d'enroulement (56) du corps de bobine (24), et qu'il est prévu un pied polaire (64) comportant une plaque terminale (66) et un embout cylindrique (68) possédant une partie extérieure filetée (70) permettant la fixation dans le taraudage (58) du corps de bobine (24).
  4. Aimant de déclenchement suivant la revendication 3, caractérisé par le fait que le pied polaire (64) et l'armature (12) possèdent des perçages intérieurs respectifs (34,72) servant à recevoir le ressort à accumulateur (26), et que le pied polaire (64) et l'armature (12) possèdent en outre d'autres perçages intérieurs respectifs (62,30) servant à loger la tige d'actionnement (28).
  5. Aimant de déclenchement suivant l'une des revendications précédentes, caractérisé par le fait qu'il est prévu un disque (62) servant à séparer le corps de bobine (24) de l'aimant permanent (14), le disque (62) reposant sur un élément de bride (60) du corps de bobine (24), qu'il est prévu des moyens (32) pour relier la tige d'actionnement (28) à l'armature (12), et qu'il est prévu un cylindre de blindage partiellement actif (82), qui entoure l'enroulement principal (20) et l'enroulement auxiliaire (18).
EP19880730191 1987-08-25 1988-08-24 Déclencheur magnétique pour disjoncteur Expired - Lifetime EP0305321B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US8929887A 1987-08-25 1987-08-25
US89298 1987-08-25

Publications (2)

Publication Number Publication Date
EP0305321A1 EP0305321A1 (fr) 1989-03-01
EP0305321B1 true EP0305321B1 (fr) 1993-03-24

Family

ID=22216845

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880730191 Expired - Lifetime EP0305321B1 (fr) 1987-08-25 1988-08-24 Déclencheur magnétique pour disjoncteur

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Country Link
EP (1) EP0305321B1 (fr)
CA (1) CA1294305C (fr)
DE (1) DE3879588D1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4017743A1 (de) * 1989-06-23 1991-01-10 Kloeckner Moeller Elektrizit Elektromagnetischer schnellausloeser fuer elektrische schaltgeraete, insbesondere fuer hochleistungskontakte von niederspannungsschaltgeraeten
FR2653610B1 (fr) * 1989-10-25 1991-12-27 Etude Realisa Disjoncteurs Interrupteur differentiel selectif a courant de defaut.
FR2656953B1 (fr) * 1990-01-05 1996-08-30 Merlin Gerin Relais electromagnetique polarise par un aimant permanent.
IT1249286B (it) * 1990-07-30 1995-02-22 Bticino Spa Elettromagnete di sgancio a magnete permanente per interruttori automatici
DE9115607U1 (de) * 1991-12-17 1992-02-13 ABB Patent GmbH, 6800 Mannheim Leitungsschutzschalter
DE4304921C1 (de) * 1993-02-18 1994-08-25 E I B S A Bistabiler magnetischer Antrieb für einen elektrischen Schalter
DE4344143B4 (de) * 1993-12-23 2004-04-01 Moeller Gmbh Elektromagnetischer Schnellauslöser für elektrische Schaltgeräte
DE19522603A1 (de) * 1995-06-19 1997-01-09 Siemens Ag Schutzeinrichtung gegen Überlastung der Schaltkontakte eines Schaltgerätes
DE19915785A1 (de) * 1999-04-08 2000-10-12 Abb Patent Gmbh Elektromagnetischer Auslöser für ein elektrisches Schaltgerät
DE10208703C1 (de) * 2002-02-25 2003-07-03 Siemens Ag Magnetantrieb für einen Leistungsschalter
CN104810217B (zh) * 2015-04-28 2017-03-08 南京大全电气研究院有限公司 一种添加导磁体的可控电磁脱扣装置及脱扣方法
CN110137044B (zh) * 2019-05-30 2024-02-02 天津加美特电气股份有限公司 一种具有常开常闭功能的智能型断路器
CN112103023B (zh) * 2020-10-12 2025-07-18 厦门大恒科技有限公司 一种检测电磁铁及断路保护装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3530414A (en) * 1969-02-26 1970-09-22 Westinghouse Electric Corp Circuit breaker with improved trip means
US4078219A (en) * 1976-02-12 1978-03-07 Westinghouse Electric Corporation Overcurrent latch for magnetic contactor
GB2122031B (en) * 1982-06-03 1985-10-30 Northern Eng Ind Electromagnetic release device
IT1161635B (it) * 1983-03-10 1987-03-18 Sace Spa Dispositivo automatico di blocco per cinematismi sottoposti a sollecitazioni meccaniche indesiderate,applicabile in particolare ad interruttori elettrici
US4641117A (en) * 1985-07-29 1987-02-03 General Electric Company Combined accessory and trip actuator unit for electronic circuit breakers

Also Published As

Publication number Publication date
CA1294305C (fr) 1992-01-14
EP0305321A1 (fr) 1989-03-01
DE3879588D1 (de) 1993-04-29

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