WO2002080206A2 - Contact blade block for medium-voltage short-circuit switches - Google Patents

Contact blade block for medium-voltage short-circuit switches Download PDF

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Publication number
WO2002080206A2
WO2002080206A2 PCT/ES2002/000142 ES0200142W WO02080206A2 WO 2002080206 A2 WO2002080206 A2 WO 2002080206A2 ES 0200142 W ES0200142 W ES 0200142W WO 02080206 A2 WO02080206 A2 WO 02080206A2
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WO
WIPO (PCT)
Prior art keywords
blades
springs
block
shirts
contact
Prior art date
Application number
PCT/ES2002/000142
Other languages
Spanish (es)
French (fr)
Other versions
WO2002080206A3 (en
Inventor
Javier Ormazabal Ocerin
Original Assignee
Grupo Ormazabal, S.A.
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 Grupo Ormazabal, S.A. filed Critical Grupo Ormazabal, S.A.
Priority to AU2002247779A priority Critical patent/AU2002247779A1/en
Publication of WO2002080206A2 publication Critical patent/WO2002080206A2/en
Publication of WO2002080206A3 publication Critical patent/WO2002080206A3/en

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Classifications

    • 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
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/365—Bridging contacts
    • 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
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/44—Contacts characterised by the manner in which co-operating contacts engage by sliding with resilient mounting

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  • Contacts (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Abstract

The invention relates to a blade block that forms the movable contacts of a medium-voltage short-circuit switch. Said blades (1) are interconnected and clamped by means of springs (3) which are disposed between the lateral, internal branches (4') of each of the U-shaped parts (4) which act as jackets that are fixed, by means of the external branch thereof, to the actual blades (1). A cross arrangement is used for the jackets (4) on the blades (1) so that the springs (3) remain between the lateral internal branches (4') which are disposed opposite one another between the blades (1). In this way, an indirect clamping means is produced between the blades (1) and the forces exerted on said blades are distributed uniformly.

Description

BLOQUE DE CUCHILLAS DE CONTACTO PARA INTERRUPTORES DE CORTE EN CARGA DE MEDIA TENSIÓN BLOCK OF CONTACT BLADES FOR CUTTING LOAD SWITCHES
D E S C R I P C I Ó ND E S C R I P C I Ó N
OBJETO DE LA INVENCIÓNOBJECT OF THE INVENTION
La presente invención se refiere a un bloque de cuchillas de contacto para interruptores de corte en carga de media tensión, que ha sido concebido para su aplicación en aquellos interruptores en los que las cuchillas que constituyen los correspondientes conductos móviles son del tipo de charnela, colaborando unos resortes o muelles para vincular entre sí las dos cuchillas, así como otros elementos, para conseguir el autocentrado de éstas con los contactos fijos en el momento de la conexión.The present invention relates to a block of contact blades for medium voltage load cutting switches, which has been designed for application in those switches in which the blades constituting the corresponding mobile ducts are of the hinge type, collaborating springs or springs to link the two blades together, as well as other elements, to achieve their self-centering with the fixed contacts at the time of connection.
El objeto de la invención es proporcionar un bloque de cuchillas para interruptores de corte de carga, en el que los muelles que colaboran en la vinculación de las dos cuchillas, en lugar de estar en contacto con éstas, están montados entre una pareja de perfiles en "U" en funciones de camisas, dispuestas de manera contrapuesta, lográndose un mejor y más uniforme reparto del esfuerzo de las propias cuchillas.The object of the invention is to provide a block of blades for load cutting switches, in which the springs that collaborate in linking the two blades, instead of being in contact with them, are mounted between a pair of profiles in "U" in function of shirts, arranged in opposite ways, achieving a better and more uniform distribution of the effort of the blades themselves.
Es también objeto de la invención proporcionar unos medios sencillos y rápidos para el acoplamiento del bloque de cuchillas al eje del interruptor sin necesidad de utilizar tornillo, muelles u otros elementos.It is also the object of the invention to provide simple and rapid means for coupling the knife block to the axis of the switch without the need for screws, springs or other elements.
ANTECEDENTES DE LA INVENCIÓNBACKGROUND OF THE INVENTION
Los interruptores de corte de carga, tienen dos tipos de contactos, unos fijos y otros móviles, de manera que éstos últimos pueden ser de tipo deslizante, rotativos o de charnela.The load cut-off switches have two types of contacts, some fixed and others mobile, so that the latter can be sliding, rotary or hinge type.
En relación con los contactos móviles tipo charnela de un interruptor de corte y carga, las cuchillas que constituyen precisamente esos contactos móviles deben mantenerse unidas entre sí, con el fin de garantizar una buena conexión con el contacto fijo.In relation to the hinge-type mobile contacts of a cut and load switch, the blades that constitute precisely those mobile contacts must be held together, in order to ensure a good connection with the fixed contact.
En tal sentido, uno de los sistemas de unión de las cuchillas se basa en la utilización de unos muelles que quedan alojados en unos rehundidos especiales previstos al efecto en las caras de las cuchillas, lo que implica que éstas últimas se deban realizar mediante forja o mecanización para que incorporen los citados alojamientos de ubicación de los muelles.In this sense, one of the systems of union of the blades is based on the use of springs that are housed in special recesses provided for the effect on the faces of the blades, which implies that the latter should be made by forging or mechanization to incorporate the aforementioned spring location housings.
También cabe tener en cuenta la unión entre las cuchillas y el eje de accionamiento del interruptor, unión que se realiza habitualmente mediante tornillos, los cuales deben estar recubiertos para evitar problemas dieléctricos .It is also possible to take into account the connection between the blades and the drive shaft of the switch, which is usually made by screws, which must be coated to avoid dielectric problems.
Otro detalle a tener en cuenta, es lo importante que resulta garantizar el autocentrado de las cuchillas móviles con los contactos fijos, en el momento de la conexión, utilizando para ello generalmente resortes o elastómeros, todo lo cual dificulta el montaje de la cuchilla en el eje o bastidor.Another detail to take into account, is the important thing that is to guarantee the self-centering of the mobile blades with the fixed contacts, at the time of connection, generally using springs or elastomers, all of which makes it difficult to mount the blade in the shaft or frame.
DESCRIPCIÓN DE LA INVENCIÓNDESCRIPTION OF THE INVENTION
El bloque de cuchillas que se preconiza ha sido concebido para resolver la problemática anteriormente expuesta, en base a una solución sencilla pero no por ello menos eficaz, según la cual los muelles de presión no se fijan directamente a las cuchillas sino que lo hacen por medio de unas piezas intermedias, lo que permite realizar las cuchillas con una forma completamente plana y que el esfuerzo de los resortes se transmita a estas de forma uniformemente distribuida.The block of blades that is recommended has been designed to solve the problem previously exposed, based on a simple solution but no less effective, according to which the pressure springs are not fixed directly to the blades but do so by means of intermediate parts, which allows to realize the blades with a completely flat and that the effort of the springs be transmitted to them evenly distributed.
Más concretamente, el bloque de cuchillas de la invención está formado por dos cuchillas como contactos principales móviles, dispuestas paralelamente entre sí y unidas por dos piezas de configuración en "U" , determinantes de sendas camisas posicionadas, en el bloque de contactos constitutivos de esas cuchillas, de forma cruzada e inversa, estando los muelles dispuestos entre las ramas internas y enfrentadas de ambas camisas, mientras que a través de las ramas externas de las camisas se unen respectivamente a las dos cuchillas.More specifically, the block of blades of the invention is formed by two blades as moving main contacts, arranged parallel to each other and joined by two "U" configuration pieces, determinants of two positioned sleeves, in the block of constituent contacts of those blades, crossed and inverse, the springs being arranged between the inner and opposite branches of both shirts, while the two blades are joined respectively through the outer branches of the shirts.
Esta nueva forma de conseguir un bloque de cuchillas como contactos móviles de un interruptor de corte de carga de media tensión, permite realizar el apriete de manera indirecta, a través de las camisas que constituyen las piezas en "U" , consiguiendo con ello un esfuerzo más repartido y uniforme sobre toda la cuchilla y evitando tener que conformar las cuchillas con formas extrañas mediante mecanización para alojar los resortes de presión, a la vez que se elimina el tener que realizar el apriete (fuerza de los muelles) directamente sobre la cuchilla.This new way of achieving a block of blades as moving contacts of a medium voltage load cut-off switch, allows tightening indirectly, through the shirts that make up the "U" pieces, thus achieving an effort more distributed and uniform over the entire blade and avoiding having to shape the blades with strange shapes by mechanization to accommodate the pressure springs, while eliminating having to perform the tightening (force of the springs) directly on the blade.
Es decir, mediante el bloque de cuchillas de la invención, la presión de contacto se consigue de manera indirecta por parte de los muelles que se intercalan entre las propias cuchillas, permite un desplazamiento perpendicular de éstas, en la dirección del eje de accionamiento, impidiendo un desplazamiento longitudinal en la dirección del eje de las propias cuchillas.That is, by means of the block of blades of the invention, the contact pressure is achieved indirectly by the springs that are sandwiched between the blades themselves, allows a displacement perpendicular to these, in the direction of the drive shaft, preventing a longitudinal displacement in the direction of the axis of the blades themselves.
Por otro lado, la fijación y autocentrado de las cuchillas respecto de los contactos fijos, se consigue mediante unas pestañas previstas en el eje del interruptor, las cuales conforman un alojamiento en "H" en el que se posicionan precisamente las cuchillas de forma ajustada, por simple presión, eliminándose con ello los clásicos tornillos y muelles de autocentrado utilizados convencionalmente .On the other hand, the fixation and self-centering of the blades with respect to the fixed contacts, is achieved by means of tabs provided on the axis of the switch, which form a "H" housing in which the blades are precisely positioned in a tight manner, by simple pressure, eliminating the conventional self-centering screws and springs conventionally used.
En una forma de realización alternativa, se puede utilizar una cuchilla de mayor longitud que la otra, permitiendo realizar una segunda puesta a tierra en los interruptores de protección de un transformador, y cuya cuchilla de mayor longitud conecta primeramente sobre la segunda puesta a tierra del interruptor (en vacío) y luego sobre el contacto de tierra principal, evitando el desgaste del primero.In an alternative embodiment, a blade of greater length than the other can be used, allowing a second earthing to be performed on the protection switches of a transformer, and whose blade of greater length first connects to the second earthing of the switch (empty) and then on the main earth contact, avoiding wear of the first.
DESCRIPCIÓN DE LOS DIBUJOSDESCRIPTION OF THE DRAWINGS
Para complementar la descripción que se está realizando y con objeto de ayudar a una mejor comprensión de las características del invento, de acuerdo con un ejemplo preferente de realización práctica del mismo, se acompaña como parte integrante de dicha descripción, un juego de dibujos en donde con carácter ilustrativo y no limitativo, se ha representado lo siguiente:To complement the description that is being made and in order to help a better understanding of the characteristics of the invention, according to a preferred example of practical implementation thereof, a set of drawings is attached as an integral part of said description. In an illustrative and non-limiting manner, the following has been represented:
La figura 1.- Muestra una representación según una perspectiva general del bloque de cuchillas de contacto para interruptores de corte en carga de media tensión, realizado de acuerdo con el objeto de la presente invención.Figure 1 shows a representation according to a general perspective of the block of contact blades for medium voltage load cut-off switches, performed in accordance with the object of the present invention.
La figura 2. - Muestra una vista en sección longitudinal del bloque de cuchillas representado en la figura anterior.Figure 2. - Shows a longitudinal section view of the block of blades shown in the previous figure.
La figura 3. - Muestra una vista en alzado de la forma de autocentrado de las cuchillas.Figure 3. - Shows an elevation view of the self-centering shape of the blades.
Las figuras 4, 5 y 6.- Muestran otras tantas vistas en planta, alzado longitudinal en sección y alzado frontal, del bloque de cuchillas en el que una de ellas es de mayor longitud que la otra.Figures 4, 5 and 6.- They show as many plan views, longitudinal sectional elevation and front elevation, of the block of blades in which one of them is longer than the other.
REALIZACIÓN PREFERENTE DE LA INVENCIÓNPREFERRED EMBODIMENT OF THE INVENTION
Como se puede ver en las figuras referidas, y en relación concretamente con las figuras 1 a 3, el bloque de cuchillas constitutivo de los contactos móviles de un interruptor de corte en carga, comprende dos cuchillas (1) dispuestas paralelamente entre sí y distanciadas mediante unos separadores (2), estando unidas en apriete entre sí ambas cuchillas (1) mediante unos muelles (3) que están situados entre sendas camisas en "U" (4) , dispuestas de manera cruzada y en oposición, es decir enfrentadas por sus concavidades y con una de sus ramas laterales por el exterior de una cuchilla (1) y la otra rama por el exterior de la cuchilla contraria, mientras que las dos ramas restantes y laterales (4') quedan por el interior, como se representa claramente en la figura 2, siendo entre estas dos ramas (4 ' ) de las dos camisas (4) entre las que quedan situados los muelles (3) . Como puede verse en las figuras, a través de la rama externa de las camisas (4), éstas se fijan a las correspondientes cuchillas (1) mediante remaches o cualquier otro sistema convencional.As can be seen in the aforementioned figures, and specifically in relation to figures 1 to 3, the block of blades constituting the mobile contacts of a load cutting switch comprises two blades (1) arranged parallel to each other and spaced apart by separators (2), both blades (1) being joined together by means of springs (3) that are located between two "U" shirts (4), arranged crosswise and in opposition, that is to say faced by their concavities and with one of its lateral branches on the outside of a blade (1) and the other branch on the outside of the opposite blade, while the two remaining and lateral branches (4 ') remain on the inside, as clearly represented in figure 2, being between these two branches (4 ') of the two shirts (4) between which the springs (3) are located. As can be seen in the figures, through the outer branch of the shirts (4), these are fixed to the corresponding blades (1) by rivets or any other conventional system.
De esta manera se consigue por un lado que las cuchillas (1) se puedan realizar completamente planas, además de que el esfuerzo de los muelles (3) queda uniformemente repartido en toda la superficie de las cuchillas . Asimismo, se ha previsto que los correspondientes remaches de contacto (5) estén decalados para evitar que la erosión y el camino recorrido por dichos remaches (5) , sobre el otro contacto, sea siempre en el mismo punto y se destruyan antes, independizando así los contactos principales de los de cierre sobre cortocircuitos.In this way it is achieved on the one hand that the blades (1) can be made completely flat, in addition to that the effort of the springs (3) is evenly distributed over the entire surface of the blades. Likewise, it is envisaged that the corresponding contact rivets (5) are offset to prevent erosion and the path traveled by said rivets (5), over the other contact, always at the same point and destroyed before, thus independent the main contacts of the closing ones on short circuits.
En cuanto a la autocentrado y fijación de las propias cuchillas (1), como se representa en la figura 3, se consigue mediante unas pestañas (6) previstas sobre el propio eje (7) del interruptor, pestañas (6) que determinan un alojamiento en forma de "H" en el que quedan dispuestas de forma ajustada y por simple presión las cuchillas (1) , eliminándose con ello los tornillos de fijación y los muelles de autocentrado requeridos convencionalmente .As for the self-centering and fixing of the blades themselves (1), as shown in Figure 3, it is achieved by means of tabs (6) provided on the axis (7) of the switch, tabs (6) that determine a housing in the form of "H" in which the blades (1) are arranged tightly and by simple pressure, thereby eliminating the fixing screws and the self-centering springs conventionally required.
Finalmente, en las figuras 4, 5 y 6, se muestra un bloque de cuchillas donde una cuchilla (1') es de mayor longitud, siendo más alargada por la parte posterior, la cual está prevista para ser utilizada para realizar la conexión a tierra de la parte eléctrica del fusible que no ha sido puesta a tierra a través del contacto principal de tierra, garantizando el contacto entre la segunda puesta a tierra del interruptor y el punto de giro de las cuchillas, realizándose la conexión por aprovechamiento del mismo movimiento del eje principal del seccionador de puesta a tierra, en la maniobra de conexión a tierra y que mediante la cuchilla alargada (1') del bloque de cuchillas, conecta la salida de fusibles a tierra a través de la propia cuchilla (en vacío) y del contacto principal y fijo (8) de cierre del seccionador.Finally, in figures 4, 5 and 6, a block of blades is shown where a blade (1 ') is of greater length, being more elongated from the back, which is intended to be used to make the ground connection of the electrical part of the fuse that has not been grounded through the main earth contact, guaranteeing the contact between the second earthing of the switch and the turning point of the blades, making the connection by use of the same movement of the main axis of the earthing switch, in the grounding maneuver and that by means of the elongated blade (1 ') of the blade block, connect the fuse output to ground through the blade itself (in empty) and of the main and fixed contact (8) of the disconnector closing.
En esas figuras 4, 5 y 6 puede observarse también el contacto (51) establecido en el extremo alargado de esa cuchilla (1') de mayor longitud.In those figures 4, 5 and 6 the contact (5 1 ) established at the elongated end of that blade (1 ') of greater length can also be observed.
Por consiguiente, mediante el bloque de cuchillas de la invención se consigue que la presión de contacto efectuada por los muelles (3) , se realice de forma indirecta al no tocar esos muelles (3) las cuchillas (1) ó (1-1'), ya que esos muelles (3) quedan intercalados entre las ramas (4') de las camisas (4), lo que supone un apriete indirecto que origina el no tener que dar formas extrañas a las cuchillas para poder ubicar los aludidos muelles (3), ni tener que utilizar tornillos de fijación, ni por supuesto utilizar herramientas como se requiere convencionalmente, con la consiguiente pérdida de tiempo en este último caso. Además, se consigue que la fuerza de los resortes se realice de forma uniforme y repartida en toda la superficie.Therefore, by means of the block of blades of the invention it is achieved that the contact pressure effected by the springs (3), is carried out indirectly by not touching those springs (3) the blades (1) or (1-1 ' ), since these springs (3) are interspersed between the branches (4 ') of the shirts (4), which implies an indirect tightening that causes not having to give strange shapes to the blades to be able to locate the aforementioned springs ( 3), neither having to use fixing screws, nor of course using tools as conventionally required, with the consequent loss of time in the latter case. In addition, it is achieved that the force of the springs is carried out uniformly and spread over the entire surface.
Igualmente, el autocentrado de las cuchillas con los contactos fijos, en el momento de conexión, queda garantizado, sobre todo en caso de cierre contra cortocircuito, no debiendo utilizar resortes o materiales elastómeros como ocurre convencionalmente, que de hecho dificultan el montaje de la cuchilla en el correspondiente eje o bastidor. Likewise, the self-centering of the blades with the fixed contacts, at the time of connection, is guaranteed, especially in case of closing against short circuit, not having to use springs or elastomeric materials as conventionally occurs, which in fact hinder the assembly of the blade in the corresponding axis or frame.

Claims

R E I V I N D I C A C I O N E S
1.- Bloque de cuchillas de contacto para interruptor de corte en carga de media tensión, que siendo aplicable en interruptores cuyos contactos móviles están constituidos por una pareja de cuchillas en cuya vinculación entre sí, para garantizar la conexión, colaboran unos muelles que quedan fijados entre las propias cuchillas, caracterizado porque la vinculación entre las cuchillas (1) y los muelles (3) se realiza con la intermediación de una pareja de piezas en forma de "U" (4) que se disponen abrazando longitudinalmente a las cuchillas (1) , determinando sendas camisas para éstas, estando dispuestas dichas camisas o piezas (4) de manera cruzada e inversa, en orden a que los muelles (3) queden ubicados entre las dos ramas laterales internas y enfrentadas (4') de las camisas (4), proporcionando un apriete indirecto y uniforme sobre las cuchillas (1) .1.- Block of contact blades for cutting switch in medium voltage load, which being applicable in switches whose mobile contacts are constituted by a pair of blades whose connection to each other, to ensure the connection, collaborate some springs that are fixed between the blades themselves, characterized in that the connection between the blades (1) and the springs (3) is carried out with the intermediation of a pair of "U" shaped pieces (4) that are arranged by longitudinally hugging the blades (1 ), determining two shirts for these, said shirts or pieces (4) being arranged in a crossed and inverse manner, in order that the springs (3) are located between the two inner and opposite lateral branches (4 ') of the shirts ( 4), providing indirect and uniform tightening on the blades (1).
2.- Bloque de cuchillas de contacto para interruptor de corte en carga de media tensión, según reivindicación 10, caracterizado porque cada una de las camisas (4) va fijada convenientemente a su respectiva cuchilla (1) que presentan una configuración completamente plana.2.- Contact blade block for medium voltage load cutting switch, according to claim 10, characterized in that each of the sleeves (4) is conveniently fixed to its respective blade (1) having a completely flat configuration.
3. - Bloque de cuchillas de contacto para interruptor de corte en carga de media tensión, según reivindicaciones anteriores, caracterizado porque las cuchillas (1) van dispuestas de manera ajustada a presión sobre un alojamiento en "H" conformado mediante unas pestañas (6) previstas al efecto en el correspondiente eje (7) del interruptor. 3. - Block of contact blades for cutting switch in medium voltage load, according to previous claims, characterized in that the blades (1) are arranged in a pressure-adjusted manner on an "H" housing formed by means of tabs (6) provided for this purpose on the corresponding axis (7) of the switch
PCT/ES2002/000142 2001-03-30 2002-03-21 Contact blade block for medium-voltage short-circuit switches WO2002080206A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002247779A AU2002247779A1 (en) 2001-03-30 2002-03-21 Contact blade block for medium-voltage short-circuit switches

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200100752A ES2180421B1 (en) 2001-03-30 2001-03-30 BLOCK OF CONTACT BLADES FOR CUTTING LOAD SWITCHES.
ESP200100752 2001-03-30

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WO2002080206A2 true WO2002080206A2 (en) 2002-10-10
WO2002080206A3 WO2002080206A3 (en) 2002-12-05

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ES (1) ES2180421B1 (en)
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WO2014071791A1 (en) * 2012-11-07 2014-05-15 江山市电器技术开发有限公司 Strong-current fixed contact device of high-voltage ground switch
WO2014154286A1 (en) * 2013-03-28 2014-10-02 Abb Technology Ltd A knife switch, a switching device comprising a knife switch and a switchgear
CN107731580A (en) * 2017-09-22 2018-02-23 深圳市泰永电气科技有限公司 Automatic transfer switching electric appliance and its contact assembly

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FI125923B (en) * 2012-12-20 2016-04-15 Abb Oy Moving contact of electronic switch
RU2707869C1 (en) * 2018-08-21 2019-12-02 Владимир Евдокимович Осипов Modular contact system of disconnectors and switches

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Title
DATABASE WPI Week 198649, Derwent Publications Ltd., London, GB; AN 1986-320377 & EP 0 203 373 A (BBC BROWN BOVERI & CIE AG) 03 December 1986 *
DATABASE WPI Week 199618, Derwent Publications Ltd., London, GB; AN 1996-172489 & DE 44 36 118 A (SCHONEMANN THOMAS DIPL ING) 28 March 1996 *
DATABASE WPI Week 199703, Derwent Publications Ltd., London, GB; AN 1997-022130 & DE 195 20 830 A (SIEMENS AG) 05 December 1996 *
PATENT ABSTRACTS OF JAPAN & JP 03 257 722 A (MITSUBISHI ELECTRIC CORP) 18 November 1991 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2674952A1 (en) * 2012-06-11 2013-12-18 ABB Oy Electric current switching apparatus
WO2014071791A1 (en) * 2012-11-07 2014-05-15 江山市电器技术开发有限公司 Strong-current fixed contact device of high-voltage ground switch
US9384909B2 (en) 2012-11-07 2016-07-05 Jiangshan Electric Technology Development Co., Ltd. Strong current static contact device for high voltage earthing switches
WO2014154286A1 (en) * 2013-03-28 2014-10-02 Abb Technology Ltd A knife switch, a switching device comprising a knife switch and a switchgear
US9466955B2 (en) 2013-03-28 2016-10-11 Abb Schweiz Ag Knife switch, a switching device comprising a knife switch and a switchgear
CN107731580A (en) * 2017-09-22 2018-02-23 深圳市泰永电气科技有限公司 Automatic transfer switching electric appliance and its contact assembly

Also Published As

Publication number Publication date
ES2180421B1 (en) 2004-04-01
ES2180421A1 (en) 2003-02-01
WO2002080206A3 (en) 2002-12-05
AU2002247779A1 (en) 2002-10-15

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