EP1544879B1 - Disjoncteur rapide pour moyenne et haute tension - Google Patents

Disjoncteur rapide pour moyenne et haute tension Download PDF

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Publication number
EP1544879B1
EP1544879B1 EP03405906A EP03405906A EP1544879B1 EP 1544879 B1 EP1544879 B1 EP 1544879B1 EP 03405906 A EP03405906 A EP 03405906A EP 03405906 A EP03405906 A EP 03405906A EP 1544879 B1 EP1544879 B1 EP 1544879B1
Authority
EP
European Patent Office
Prior art keywords
contact
switching
rotary
torsion spring
contact piece
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
EP03405906A
Other languages
German (de)
English (en)
Other versions
EP1544879A1 (fr
Inventor
Kaveh Niayesh
Lutz Niemeyer
Magnus Backman
Willi Paul
Gerhard Salge
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 Research Ltd Switzerland
ABB Research Ltd Sweden
Original Assignee
ABB Research Ltd Switzerland
ABB Research Ltd Sweden
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 ABB Research Ltd Switzerland, ABB Research Ltd Sweden filed Critical ABB Research Ltd Switzerland
Priority to DE50306400T priority Critical patent/DE50306400D1/de
Priority to EP03405906A priority patent/EP1544879B1/fr
Priority to AT03405906T priority patent/ATE352851T1/de
Publication of EP1544879A1 publication Critical patent/EP1544879A1/fr
Application granted granted Critical
Publication of EP1544879B1 publication Critical patent/EP1544879B1/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
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
    • H01H3/3042—Power arrangements internal to the switch for operating the driving mechanism using spring motor using a torsion spring
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2041—Rotating bridge
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
    • H01H2003/3084—Kinetic energy of moving parts recuperated by transformation into potential energy in closing or opening spring to be used in next operation

Definitions

  • the invention relates to the field of primary technology for electrical power switches, in particular for power switching in high and medium voltage technology. It is based on a method and a device for power circuit and of a switchgear with such a circuit breaker according to the preamble of the independent claims.
  • EP 1 180 776 A1 discloses a high or medium voltage switch with an electrodynamically driven rotary bridge contact piece is bridged in the contact-closed state, the distance between the two fixed contacts and releases two contact gaps when contact opens.
  • the two resulting partial arcs lie in series and are therefore easier to erase than a single arc.
  • the electrodynamic drive each comprises a coil for contact opening and contact closure, wherein in each case by electromagnetic repulsion between the coil current and the eddy current induced in the bridge contact piece, the bridge contact piece is set in a contact-opening or contact-closing rotation. After a certain angle of rotation, the bridge contact piece is first braked by a mechanical braking and holding device, for example by mechanical friction, and then held.
  • the rotary contact drive achieves very fast switching times and requires less switching energy as a translatory contact drive.
  • the switching point can be designed dielectrically advantageous.
  • EP 1 067 569 discloses a high or medium voltage switch with a ring contact piece driven electrodynamically in translation.
  • a high-voltage circuit breaker which has an electro-dynamic Thomson drive for very fast opening of the contacts.
  • the drive comprises a conductive disc which is electromagnetically driven by coil-induced eddy current forces and thereby performs a fast contact-opening or contact-closing translational movement.
  • the necessary switching speed is achieved by a capacitor discharge, which is started shortly before a current zero crossing.
  • Other embodiments relate to a translational movement of a tubular, axially displaceable contact piece and a bending movement of a one-sided clamped resilient contact plate, which is supported due to the spring restoring force supported by a Thomson drive.
  • the bending elastic spring oscillates during the switching process through the neutral position and in a counter-deflection, whereby part of the spring energy is recovered and stored again.
  • the invention relates to a prior art, as known from GB 561,590.
  • a current switch for power circuit which has two spaced fixed electrodes and an interposed, rotationally movable switching contact piece.
  • a rotary drive serves to rotate the switching contact piece in a first rotational switching direction for the purpose of contact opening and in a second rotational switching direction for the purpose of contact closure of the fixed electrodes.
  • the rotary drive has a common mechanical torsion spring mechanism for rotating the switch contact in both rotational switch directions for contact opening and closing. There is no mechanism for recovering rotational switching energy.
  • US 5,777,404 discloses a rotary actuator for driving a switch pin in a switchgear.
  • the actuator drive comprises a torsion spring and a flywheel, which temporarily stores rotational switching energy, moves the contact pin further after the torsion spring has released, and, during the free run-out of the flywheel, returns the cached rotational energy as far as possible to the torsion spring.
  • Recuperation requires a flywheel with a large moment of inertia in order to buffer as much rotational energy as possible and deliver it to the torsion spring when it comes to a standstill.
  • the switching contact piece itself is lightweight and designed with a low moment of inertia, so that it can be set into rapid rotation and can be braked abruptly in its end position regardless of the flywheel.
  • Object of the present invention is to provide a method, a device and an electrical switchgear with such a device for power switching with a rotary contact drive, which is characterized by short switching time and low switching energy consumption. This object is achieved according to the invention by the features of the independent claims.
  • the invention in a method for power switching, in particular in a switch for medium or high voltage, wherein between two spaced fixed electrodes, a rotatably movable switching contact piece is arranged, which by a rotary drive in a first rotational switching direction for the purpose of contact opening and in a second rotational switching direction is set for the purpose of contact closure of the fixed electrodes in a rotational movement, wherein the switching contact piece is rotated by mechanical torsional spring force and the torsional spring force for contact opening and the torsional spring force for contact closure by a common mechanical torsion spring mechanism are applied.
  • the rotationally movable contact piece during the switching operation is no longer offset by an electrodynamic but by a mechanical torsion drive in contact-opening or contact-closing rotation.
  • the first and second rotation switching directions are driven by the same torsion spring mechanism.
  • a Thomson drive which is less energy efficient and often large volume, omitted or designed only as a small support unit. This eliminates or reduces the need for large capacitors and switches, z. As thyristors, for controlling the Thomson drive. So are created with little construction effort and with low demand for switching energy very quickly on and off switching power switch.
  • a rotational energy of the switching contact piece is partially recovered during contact opening and / or contact closure.
  • the rotary drive thus comprises a device for recovering and storing excess torsional stress from a preceding switching operation.
  • the torsion spring mechanism is preferably allowed to overshoot in the opposite direction to the original pretensioning direction and blocked in a position deflected as far as possible by overshooting. In this way, a significantly better energy efficiency is achieved with regard to the switching energy to be applied.
  • rotational energy losses of the switching contact piece during contact opening and / or during contact closure are recharged by a torsion clamping device.
  • the torsion chuck may be a Thomson drive or a stepper motor.
  • high switching energies and thus very fast switching times can be achieved with relatively small electrical support drives.
  • the required capacitors, thyristors or generally switches and / or stepper motors can be designed much more compact and economical.
  • the invention relates to a power switch for power circuit, in particular for carrying out the method described above, comprising two spaced fixed electrodes, a rotatably movable switching contact piece and a rotary drive for rotating the switching contact piece in a first rotational switching direction for the purpose of contact opening and in a second rotational switching direction
  • the rotary drive has a common mechanical torsion spring mechanism for rotating the switching contact piece in both the first rotational shift direction and in the second rotational shift direction.
  • the rotary drive comprises a latching device for partially recovering mechanical rotational switching energy and a torsional clamping device for mechanically recharging rotational switching energy losses.
  • Fig. 1a, 1b shows schematically in plan view a current switch 1 with two fixed electrodes 2a, 2b and a switching contact piece 2c, here a bridge contact piece 2c, which is rotatably mounted about a rotation axis 4, here a symmetry or center axis 4, and by a rotary drive 3, 6-9 is drivable.
  • the switch 1 is in an encapsulated and optionally evacuated or isoliergastellen switch housing 5 is arranged.
  • the rotary drive is typically, but not necessarily, located outside and via a gas-tight rotary feedthrough 6, z. As a magnetic rotary feedthrough or a Metallfaltenbalg penation, mechanically connected to the switching contact piece 2c.
  • the rotary drive 3, 6-9 a mechanical torsion spring mechanism 3, which serves to rotate the switching contact piece 2c both in a first rotational switching direction 30 for contact opening and in a second rotational switching direction 31 for contact closure.
  • the rotary drive 3, 6-9 comprises a latching device 7 for partially recovering mechanical rotational switching energy and / or a torsion clamping device 9 for mechanical recharging of rotational switching energy losses. These are caused by friction and other irreversible processes. Further, a switch controller 8 for controlling the latching device 7 by means of switching commands 8a and the torsion clamping device 9 by means of Torsionsspannbeplane 8b is present.
  • Fig. 2a and Fig. 2b show in detail in plan view and side view of the operation of the rotating bridge contact 2c of length 1 and width b.
  • the width b or more precisely the conductor cross-section is selected according to the required current carrying capacity of the circuit breaker 1.
  • On the fixed electrodes 2a, 2b are resilient contacts 10, z. B.
  • multi-contact springs 10 present, the effect of a resilient behavior of the fixed electrodes 2a, 2b, symbolized by 10 ', and ensure that a high contact force, a low contact resistance and a low-impedance Electricity transfer between the electrodes 2a, 2b, 2c is ensured. This also prevents the contacts 2a, 2b, 2c from overheating at nominal current and from being welded together by the contact-closed switch 1 in the case of overcurrents. In addition, the dynamic reaction forces are absorbed and compensated by the spring contacts 10 at the contact closure 31.
  • Fig. 2b shows four angular positions of the bridge contact piece 2c and thus of the torsion spring mechanism 3, namely a force-free neutral angular deflection 11b of the torsion spring mechanism 3, which lies between a contact-closed angle deflection 11a and a contact-opened angular deflection 11c, and one biased by the torsion clamping device 9 (not visible here) contact-opened angular deflection 11d.
  • the first and second rotational switching directions 30, 31 will be opposite to each other. But there are also arrangements conceivable and mitbe bulkt here, in which the rotational switching directions 30, 31 are rectified, d. H.
  • the switching contact piece 2c always rotates in the same direction and, if appropriate, the biasing and rotational direction of the torsion spring mechanism 3 is alternated.
  • an arc is typically drawn.
  • two partial arcs 12a, 12b which lie in series with one another in the contact gaps 13a, 13b are formed.
  • currents can be switched off and switched on at a higher voltage level and with less effort during arc extinguishing.
  • the power switch 1 for both rotational switch directions 30, 31 quickly switching and in particular a fast-switching synchronous switch. 1
  • FIG. 3a-3d show schematically an exemplary embodiment of the operation of the latching device 7, ie its latching means 7a, 7b, 11a, 11b, 11c, 11d, for a contact-opening rotational switching direction 30.
  • the latching means 7a, 7b, 11a, 11b, 11c, 11d serve for partial recovery of mechanical rotational switching energy upon contact opening.
  • the latching device 7 comprises: in Fig.
  • a contact-closed torsion lock 7a, 11a (comprising a rotatable opening pawl 7a for engaging a counterpart 11a) for contact closure of the torsion spring mechanism 3 and for storing the contact-opening rotational switching energy; in Figures 3b and 3c, a contact-opened torsion lock 7b, 11c (comprising a rotatable locking pawl 7b for engaging a counterpart 11c) for partially recovering the contact-opening rotational switching energy; and in Fig.
  • a preloaded contact-opened torsion lock 7b, 11d (comprising the rotatable locking pawl 7b for engaging a counterpart 11d) for recharging rotational losses and storing the total contact-closing rotational switching energy of the torsion spring mechanism 3.
  • the locking pawl 7b prevents recoil
  • the torsional tensioning device 9 only needs to compensate for and recharge the energy loss amounting to, for example, about 36% of the total stored rotational energy (corresponding to a constant frictional torque of 10% of the maximum torque).
  • the torsion chuck device 9 may include torsion biasing means 9 for mechanically recharging rotational friction losses for both rotational shift directions 30, 31.
  • the torsion spring 3 which is in particular a torsion spring 3 can be reduced in size.
  • the frictional losses in this case are estimated to be 14 J for a contact-opening switching operation.
  • the invention also provides a method for current switching, in particular in a switch 1 for medium or high voltage of the type described, wherein between two spaced fixed electrodes 2a, 2b, a rotatably movable switching contact piece 2c is arranged by a rotary drive 3, 6-9 in a first rotational switching direction 30 for the purpose of contact opening and in a second rotational switching direction 31 for the purpose of contact closure of the fixed electrodes 2a, 2b is set in a rotary motion, wherein the switching contact piece 2c by mechanical torsion spring force F f0 , F fS is rotated and the torsional spring force F f0 for contact opening and the torsional spring force F fs are applied to contact closure by a single common torsion spring mechanical mechanism 3.
  • a rotatably movable switching contact piece 2c is arranged by a rotary drive 3, 6-9 in a first rotational switching direction 30 for the purpose of contact opening and in a second rotational switching direction 31 for the purpose of contact closure of the fixed electrodes 2
  • the rotational energy of the switching contact piece 2c is partially recovered upon contact opening and / or contact closure.
  • rotational energy losses of the switching contact piece 2c during contact opening and / or contact closure are recharged by a torsion clamping device 9, in particular by a Thomson drive 9 or a stepping motor 9.
  • a torsion clamping device 9 in particular by a Thomson drive 9 or a stepping motor 9.
  • EP 1 180 776 A1 and EP 1 067 569 with their entire disclosure content, in particular with regard to the design and control of an electro-dynamic Thomson drive 9, included in the description.
  • the first and second rotational switching directions 30, 31 are typically opposite to each other.
  • a force-free neutral angular deflection 11b of the torsion spring mechanism 3 or of the switching contact piece 2c is passed through by the switching contact piece 2c during contact opening and / or contact closure.
  • the contact opening and the contact closure should be performed synchronously and at high speed while avoiding or reducing arcing 12a, 12b.
  • inventions relate to, inter alia, the use as a switch 1 for medium or high voltages and / or currents, as a circuit breaker 1, disconnectors, current limiters or current-limiting switch in power supply networks.
  • the invention also includes an electrical switchgear, in particular a high or medium voltage switchgear, characterized by a device 1 as described above.

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Mechanisms For Operating Contacts (AREA)

Claims (9)

  1. Procédé de commutation du courant, notamment dans un commutateur (1) pour moyenne ou haute tension, un élément de contact de commutation (2c) mobile rotatif étant disposé entre deux électrodes fixes (2a, 2b) espacées, lequel est mis dans un mouvement de rotation par un mécanisme d'entraînement de rotation (3, 6-9) dans un premier sens de commutation de rotation (30) en vue d'ouvrir le contact et dans un deuxième sens de commutation de rotation (31) en vue de fermer le contact des électrodes fixes (2a, 2b), l'élément de contact de commutation (2c) étant en plus tourné par la force de ressort de torsion mécanique (Ff0, FfS) et la force de ressort de torsion (Ff0) destinée à l'ouverture du contact et la force de ressort de torsion (FfS) destinée à la fermeture du contact étant appliquées par un mécanisme à ressort de torsion mécanique (3) commun, caractérisé en ce qu'une énergie de rotation de l'élément de contact de commutation (2c) est partiellement récupérée lors de l'ouverture du contact et/ou de la fermeture du contact.
  2. Procédé selon la revendication 1, caractérisé en ce que les pertes d'énergie liées à la rotation de l'élément de contact de commutation (2c) lors de l'ouverture du contact et/ou de la fermeture du contact sont rechargées par un dispositif à contrainte de torsion (9), notamment un mécanisme d'entraînement de Thomson (9) ou un moteur pas à pas (9).
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce que
    a) le premier et le deuxième sens de commutation de rotation (30, 31) sont opposés l'un à l'autre et/ou
    b) une déviation angulaire (11b) neutre exempte de force du mécanisme à ressort de torsion (3) est parcourue par l'élément de contact de commutation (2c) lors de l'ouverture du contact et/ou de la fermeture du contact et/ou
    c) l'ouverture du contact et la fermeture du contact s'effectue de manière synchrone et à grande vitesse en évitant ou en réduisant la formation d'arcs électriques (12a, 12b).
  4. Commutateur de courant (1) pour la commutation de puissance, notamment pour mettre en oeuvre le procédé selon l'une des revendications précédentes, comprenant deux électrodes fixes (2a, 2b) espacées, un élément de contact de commutation (2c) mobile rotatif et un mécanisme d'entraînement de rotation (3, 6-9) pour faire tourner l'élément de contact de commutation (2c) dans un premier sens de commutation de rotation (30) en vue d'ouvrir le contact et dans un deuxième sens de commutation de rotation (31) en vue de fermer le contact des électrodes fixes (2a, 2b), le mécanisme d'entraînement de rotation (3, 6-9) présentant un mécanisme à ressort de torsion mécanique (3) commun pour faire tourner l'élément de contact de commutation (2c) dans le premier sens de commutation de rotation (30) et dans le deuxième sens de commutation de rotation (31) et un dispositif à contrainte de torsion (9) pour recharger mécaniquement les pertes d'énergie liées à la commutation de rotation, caractérisé en ce que le mécanisme d'entraînement de rotation (3, 6-9) comprend un dispositif d'encliquetage (7) pour la récupération partielle de l'énergie mécanique de commutation de rotation de l'élément de contact de commutation (2c).
  5. Commutateur de courant (1) selon la revendication 4, caractérisé en ce que
    a) il existe une déviation angulaire (11b) neutre exempte de force du mécanisme à ressort de torsion (3), laquelle se trouve entre une déviation angulaire de contact fermé (11a) et une déviation angulaire de contact ouvert (11c) du mécanisme à ressort de torsion (3) et/ou
    b) le premier et le deuxième sens de commutation de rotation (30, 31) sont opposés l'un à l'autre.
  6. Commutateur de courant (1) selon l'une des revendications 4 à 5, caractérisé en ce que
    a) le dispositif d'encliquetage (7) présente des moyens d'encliquetage (7a, 7b, 11a, 11b, 11c, 11d) pour la récupération partielle de l'énergie mécanique de commutation de rotation dans les deux sens de commutation de rotation (30, 31) et/ou
    b) le dispositif à contrainte de torsion (9) comprend des moyens à contrainte de torsion (9) pour recharger mécaniquement les pertes d'énergie liées à la rotation dans les deux sens de commutation de rotation (30, 31) et/ou
    c) notamment en ce que le mécanisme d'entraînement de rotation (3, 6-9) comprend une commande de commutateur (8) pour commander le dispositif d'encliquetage (7) et le dispositif à contrainte de torsion (9).
  7. Commutateur de courant (1) selon l'une des revendications 4 à 6, caractérisé en ce que le dispositif d'encliquetage (7) présente un blocage de torsion de contact fermé (7a, 11a) pour fermer le contact du mécanisme à ressort de torsion (3) et pour accumuler l'énergie de commutation de rotation d'ouverture du contact, un blocage de torsion de contact ouvert (7b, 11c) pour récupérer partiellement l'énergie de commutation de rotation d'ouverture du contact et un blocage de torsion de contact ouvert précontraint (7b, 11d) pour recharger les pertes d'énergie liées à la rotation et pour accumuler la totalité de l'énergie de commutation de rotation de fermeture du contact du mécanisme à ressort de torsion (3).
  8. Commutateur de courant (1) selon l'une des revendications 4 à 7, caractérisé en ce que
    a) le mécanisme à ressort de torsion mécanique (3) est une barre de torsion (3) et/ou
    b) le dispositif à contrainte de torsion (9) est un mécanisme d'entraînement de Thomson (9) ou un moteur pas à pas (9) et/ou
    c) l'élément de contact de commutation (2c) est un élément de contact de commutation à cavalier (2c) qui est logé de manière à tourner autour d'un axe central (4) et qui libère à chaque fois une fente de contact (13a, 13b) vers chaque électrode fixe (2a, 2b) lors de l'ouverture du contact et/ou
    d) le commutateur de courant (1) est logé dans un boîtier de commutateur encapsulé (5) et présente pour le mécanisme d'entraînement de rotation (3, 6-9) une traversée de rotation (6) hermétique et/ou
    e) le commutateur de courant (1) est à commutation rapide pour les deux sens de commutation de rotation (30, 31) et il est notamment un commutateur synchrone (1) à commutation rapide.
  9. Équipement de commutation électrique, notamment équipement de commutation pour haute ou moyenne tension, caractérisé par un commutateur de courant (1) selon l'une des revendications 4 à 8.
EP03405906A 2003-12-18 2003-12-18 Disjoncteur rapide pour moyenne et haute tension Expired - Lifetime EP1544879B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE50306400T DE50306400D1 (de) 2003-12-18 2003-12-18 Schneller Leistungsschalter für Hoch-oder Mittelspannung
EP03405906A EP1544879B1 (fr) 2003-12-18 2003-12-18 Disjoncteur rapide pour moyenne et haute tension
AT03405906T ATE352851T1 (de) 2003-12-18 2003-12-18 Schneller leistungsschalter für hoch-oder mittelspannung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03405906A EP1544879B1 (fr) 2003-12-18 2003-12-18 Disjoncteur rapide pour moyenne et haute tension

Publications (2)

Publication Number Publication Date
EP1544879A1 EP1544879A1 (fr) 2005-06-22
EP1544879B1 true EP1544879B1 (fr) 2007-01-24

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ID=34486554

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03405906A Expired - Lifetime EP1544879B1 (fr) 2003-12-18 2003-12-18 Disjoncteur rapide pour moyenne et haute tension

Country Status (3)

Country Link
EP (1) EP1544879B1 (fr)
AT (1) ATE352851T1 (fr)
DE (1) DE50306400D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101522266B1 (ko) * 2013-11-06 2015-05-21 엘에스산전 주식회사 회로 차단기
KR101522267B1 (ko) * 2013-11-06 2015-05-21 엘에스산전 주식회사 회로 차단기

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006037283A1 (de) 2006-08-09 2008-02-14 Siemens Ag Antrieb für einen elektromechanischen Schalter
US9431184B2 (en) 2013-11-06 2016-08-30 Lsis Co., Ltd. Circuit breaker

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB561590A (en) * 1942-11-20 1944-05-25 Reyrolle A & Co Ltd Improvements in or relating to operating means for electric switchgear
US2846622A (en) * 1956-09-21 1958-08-05 Gen Electric Operating mechanism for an electric circuit breaker
GB1068324A (en) * 1963-05-20 1967-05-10 John Henry Waghorne Electric circuit breaker
AU706365B2 (en) * 1994-11-07 1999-06-17 Siemens Aktiengesellschaft Rotating actuator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101522266B1 (ko) * 2013-11-06 2015-05-21 엘에스산전 주식회사 회로 차단기
KR101522267B1 (ko) * 2013-11-06 2015-05-21 엘에스산전 주식회사 회로 차단기

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Publication number Publication date
ATE352851T1 (de) 2007-02-15
EP1544879A1 (fr) 2005-06-22
DE50306400D1 (de) 2007-03-15

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