Abb Schweiz Ag

Abb Research Ltd.

Abb S.p.a.

Rudolf Gati

Felix Greuter

Osvaldo Prestini

Arthouros Iordanidis

Thorsten Strassel

Markus Abplanalp

Matthias Bator

Thierry Delachaux

Pierluigi Cisana

Davide Pessina

Pierre Corfdir

Harm De Roo

Romeo Bianchetti

Thomas Wulf

An arc chamber for a DC circuit breaker includes an entry side adapted to receive an electric arc, which was generated outside of the arc chamber and which propagates in a forward direction, a plurality of stacked splitter plates, and at least one inhibitor barrier. The at least one inhibitor barrier is arranged on the entry side to inhibit a reverse propagation of the electric arc out of the arc chamber in a reverse direction. DC circuit breaker comprising an arc chamber. Use of an arc chamber with a circuit breaker in a DC electrical system.

Arc chamber for a DC circuit breaker

A DC circuit breaker including a pair of arcing contact members for holding an arc, an interaction element, adapted for interacting with the arc in dependence of whether the arc is in a first or second state such that the arc voltage drop in the first state is lower than the drop in the second state, a resonance branch coupled in parallel to the contact members thereby forming a resonance circuit adapted for letting a resonance branch current Ioscillate thereby inducing oscillations of an arc current I, wherein the resonance branch includes a coupling element for coupling the resonance branch with the arc, such that the arc is brought to the first state when the current Iin the resonance branch has a first direction, and that the arc is brought to the second state when the current Iin the resonance branch has a second direction.

Passive resonance DC circuit breaker

Exemplary embodiments are directed to a direct current switching apparatus including at least a first mechanical switching device which is suitable to be positioned along an operating path of an associated DC circuit and includes a fixed contact and a corresponding movable contact which can be actuated between a closed position and an open position along the operating path, wherein an electric arc can ignite between the contacts under separation. The switching apparatus includes an electronic circuit having a semiconductor device which is suitable to be positioned along a secondary path and connected in parallel with the first mechanical switching device. The electronic circuit can be configured to commute the flow of current from the operating path to the secondary path and extinguish an electric arc ignited when the movable contact separates from the fixed contact when the first mechanical switching device fails to extinguish the same.

DC current switching apparatus, electronic device, and method for switching an associated DC circuit

A sensor unit for the measurement of a current in a conductor () comprising at least one magnetoresistive sensor () located at a radial distance from the outer surface of the conductor () is disclosed, wherein the conductor () has a circular cross-section, and wherein it comprises at least one auxiliary coil () for the generation of a bias magnetic field (H) to the magnetoresistive sensor () strong enough for inducing magnetic saturation in the magnetoresistive sensor () continuously during the whole current measurement process. Further the use of such a sensor and a method for measuring the current in the conductor using such a sensor unit are disclosed.

Magnetoresistive sensor arrangement for current measurement

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Niederrohrdorf, Switzerland

Rudolf Gati