Abstract:
A pole part of a low-, medium- or high voltage circuit breaker arrangement includes a pole housing for accommodating a vacuum interrupter with a pair of corresponding electrical contacts. A fixed electrical contact is connected to an upper electrical terminal and a movable electrical contact is connected to a lower electrical terminal. The movable electrical contact is operated by a pushrod, and a triggered-vacuum gap or -gas gap or the combination of gas and vacuum gap connected in series is connected in parallel to the electrical contacts in order to avoid contact welding. The triggered vacuum gap or gas gap unit is removably mounted between the upper electrical terminal and the lower electrical terminal is arranged adjacent to the pole housing. Furthermore, the vacuum interrupter device can be triggered directly to protect the vacuum interrupter device from an in-rush current load during the closing operation, for example, during capacitive switching.
Abstract:
A vacuum interrupter for a circuit breaker arrangement including a cylindrically shaped insulating part, within which a pair of electrical contact parts are coaxially arranged and concentrically surrounded by the insulating part, wherein the electrical contact parts are arranged for initiating a disconnection arc only between corresponding inner contact elements after starting a disconnection process, and corresponding outer contact elements are arranged for commutating the arc from the inner contact elements to the outer contact elements until the disconnection process is completed wherein each inner electrical contact element is a TMF-like contact element for generating mainly a transverse magnetic field, and each outer electrical contact element is an AMF-like contact element for generating an axial magnetic field.
Abstract:
An exemplary vacuum interrupter arrangement for a medium voltage circuit breaker includes a vacuum housing within which a pair of electrical contacts are coaxially arranged and concentrically surrounded by the cylindrical shaped vacuum housing. The electrical contacts are formed as a type of TMF-contacts, each having a slotted cup-shaped contact part which is attached to the distal end of a contact shaft and which is covered by a contact ring disposed on a rim of the cup-shaped contact part, wherein each cup-shaped contact part is provided with a vertical inward bending towards the contact ring. The outer diameter of the bottom section of the cup-shaped contact part is larger than the outer diameter of its rim section, in order to alter the Lorentz force to a respective inward direction.
Abstract:
A vacuum interrupter is provided with a double co-axial contact arrangement in which an inner contact can have a TMF-like or Pin shape arranged within a concentrically cup shaped AMF coil having a single layer or multilayered contact parts at each side, on the side of a fixed contact arrangement as well as on the side of a movable contact arrangement. To provide high conductivity and low resistance, the outer cup shaped contact is made from a double or multiple layer arrangement, wherein at least one layer is made from a hard steel or steel alloy, and at least a second layer is made from material with high thermal conductivity.