Abb Technology Ag

Daniel Ohlsson

Lars E Jonsson

Lars Liljestrand

Olaf Hunger

Navid Mahdizadeh

Timo Kehr

Stephan Grob

Per Skarby

Jürgen Häfner

Nicola Gariboldi

Javier Mantilla

Martin Kriegel

Mathias-Dominic Buergler

Jakub Korbel

Emmanouil Panousis

Markus Bujotzek

Juerg Nufer

Jurg Nufer

A high voltage DC circuit breaker includes a semiconductor switching assembly in series with a mechanical switch. When the semiconductor switching assembly is switched off due to a current fault, a residual current flowing through arresters of the semiconductor switching assembly is switched off by the mechanical switch. A capacitor arranged parallel to the mechanical switch leads to passive resonance effects, which in turn induce current zero crossings in its arc. The current zero crossings allow for reliable extinguishing of the arc. The mechanical switch can be an AC circuit breaker.

Method, circuit breaker and switching unit for switching off high-voltage DC currents

A simplified construction of a gas-insulated high-power circuit breaker with a saving of components is achieved by at least one hole and at least one leaf spring, which is fastened on one side and is elastically bendable in dependence upon the pressure of the insulating gas in the compression volume, being formed in a valve plate of the valve. The bendable spring closes off the hole when the circuit breaker closes and opens it when the circuit breaker opens as soon as the pressure of the compressed insulating gas in the compression volume exceeds the value of the gas pressure in the low-pressure chamber by at least two bar.

Gas-insulated high-voltage power circuit breaker

A self-blowout circuit breaker is disclosed which includes contacts for connecting or disconnecting a circuit, a heating volume, a compression volume and an exhaust volume. The compression volume can be connected to the heating volume by at least one first valve, which heating volume is in turn connected to an arc zone. Upon the disconnection of the circuit, while a first arcing contact is being disconnected from an associated second arcing contact, an arc is produced between the two arcing contacts in the arc zone. The compression volume is separated from the exhaust volume by a combined filling and overpressure valve which is formed as at least one plate, and has at least one tab which is formed in the plate.

Self-blowout circuit breaker having a filling and overpressure valve

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Wettingen, Switzerland

Daniel Ohlsson