Abstract:
The invention relates to a disconnecting switch (20) comprising a housing (22), a rocker (60) for receiving a fuse link (100) or a disconnecting plug (80) containing a receiving zone for a fuse link (100). According to the invention, the rocker (60) comprises a moveable conductable covering device (120) in order to make contact with a contact (102) in a fuse link (100). The rocker (60) is arranged in the housing (22) pivoting between an on-position and an off-position. A contact device comprising a contact element (32) is disposed in the housing (22) in such a way that the contact element (32) makes contact with the contact (102) in the fuse link (100) via the covering device (120) in the on-position in the rocker (60). The disconnecting switch (20) comprises a spring device (160) which on at least one side in relation to the housing is arranged in such a manner that it exerts a force onto the conductive covering device (120) counter to the direction in which the disconnecting plug (80) is inserted into the rocker (60). The intensity of said force depends on the shifting position of the rocker.
Abstract:
A vacuum circuit breaker comprises a vacuum interrupter operable between a closed state and an open state, and an actuator. The actuator comprises a piezoelectric driving element that is expandable and contractable along an expansion axis in response to an electrical input signal. The actuator further comprises a mechanical amplifying structure extendable along an actuation axis and being mechanically coupled to the piezoelectric driver such that expansion or contraction of said piezoelectric driving element causes the amplifying structure to extend or retract along the actuation axis. The mechanical amplifying structure is coupled to the vacuum interrupter for operating the vacuum interrupter between said closed and open states.
Abstract:
An electromagnetic circuit breaker (1) comprising fixed contacts (11), moveable contact bridges (13) arranged to electrically connect the fixed contacts(11), a magnetic core (3), a coil (4) electrically connected to the fixed contacts (11) and arranged to magnetise the magnetic core (3), an actuator (5) arranged to actuate the moveable contact bridges (13) between a closed circuit position in which the moveable contact bridges (13) are in mechanical connection with the fixed contacts (11) and the actuator (5) is in a first actuator position and an open circuit end position in which the actuator (5) is in a second actuator position, a magnetic member (7) arranged to move to the magnetic core (3) when the coil (4) is fed with a current greater than a threshold value, wherein the magnetic member (7) is arranged to initiate an initial motion of the actuator (5) when the magnetic member (7) moves towards the magnetic core (3) to break the mechanical connection between the moveable contact bridges (13) and the fixed contacts (11).The electromagnetic circuit breaker (1) further comprises a resilient arrangement (17), an energy accumulating member (19), and a bi-stable linkage (9) which in a first equilibrium state is arranged to maintain the resilient arrangement in an energised state, forcing the actuator (5) into the first actuator position, wherein bi-stable linkage (9) is arranged to be released from the first equilibrium state by the initial motion of the actuator (5), wherein the energy accumulating member (19) is arranged to provide a continued motion of the actuator (5) to the second actuator position.
Abstract:
Die vorliegende Erfindung betrifft einen Hochstromschalter (1) mit einem ersten Festkontakt (2), einem von dem ersten Festkontakt (3) beabstandeten zweiten Festkontakt und zumindest einer gegenüber den beiden Festkontakten beweglichen Kontaktbrücke (4). Ferner ist eine Zustellvorrichtung vorgesehen, um die Kontaktbrücke (4) von einer geöffneten Stellung, in der die beiden Festkontakte (2, 3) nicht miteinander verbunden sind, in eine geschlossene Stellung zu überführen, in der die Kontaktbrücke die beiden Festkontakte elektrisch miteinander verbindet. Die Zustellvorrichtung ist ferner dazu vorgesehen, die Kontaktbrücke in der geschlossenen Stellung gegen die beiden Festkontakte zu pressen. Erfindungsgemäß ist vorgesehen, dass die Zustellvorrichtung federlos ausgebildet ist, wobei die Steifigkeit von Kontaktbrücke und Zustellvorrichtung in Richtung der Presskraft einem Wert von mindestens 50.000 kNmm 2 entspricht, und wobei die niedrigste Eigenfrequenz des Systems bestehend aus Kontaktbrücke und Zustellvorrichtung in Richtung der Presskraft größer 2000 Hz ist.
Abstract:
A switching device (102, 104, 106) for electric power distribution, electrically connectable to an electrical conductor (114, 116, 118), the switching device comprising a breaker (126, 128, 130) electrically connectable to the electrical conductor, and an at least partially electrically conductive housing (120, 122, 124) to which the breaker is mounted, the housing having an outer surface (134).The breaker comprises at least one electrically conductive first contact (202) and one electrically conductive second contact (204), the second contact being movable and in relation to the first contact and in relation to the housing, and when the first and second contacts are in contact the breaker is in a closed position, and when the first and second contacts are separated the breaker is in an open position. The switching device is arranged to provide a current path between the breaker and the electrical conductor, and the housing houses at least one guiding member (150, 152) for operating the second contact (204), the at least one guiding member being movable in relation to the housing, wherein the at least one guiding member comprises a biasing assembly (151) arranged to bias the second contact against the first contact when the breaker is in the closed position. The biasing assembly comprises a plurality of biasing members (156, 158) comprising a first biasing member (156) and a second biasing member (158). A switchgear for electric power distribution comprising at least one such switching device.
Abstract:
A contact apparatus (101) of a circuit breaker is disclosed. The contact apparatus has an outer carrier (220), an inner carrier (222), one or more contact fingers (226) pivotally mounted to the inner carrier (222), a cam lever (228) pivotally mounted to the outer carrier (220), and a cam (230) and cam profile (232) formed on respective ones of the cam lever (228) and inner carrier (222). Circuit breakers and electrical contact assemblies having the contact apparatus (101), and methods of operating the contact apparatus (101) and electrical contact assemblies are disclosed.
Abstract:
The present invention relates to an improved contact arrangement in a low voltage switching device to withstand high fault currents. The improved contact arrangement in a low voltage Switching device, preferably a power circuit breaker comprising of at least a pair of stationary conductors (1, 6) joined by moving conductor (4), a portion of which is a flexible conductor (5) with appropriate ratio/geometry comprising a dynamic compensation loop to compensate constriction forces generated on account of fault currents of high magnitude flowing through the contacts.