Fronius International Gmbh

Stefan Breuer

Christian Fasthuber

Franz Fischereder

Walter Spitzer

Bernd Hofer

Mario Bairhuber

Reimar Pfeil

Andreas Hofer

Florian Gerstlacher

Thomas Grabner

The aim of the invention is to detect an arc in an assembly for transmitting a direct voltage. This aim is achieved by a communication transformer having a primary winding and a secondary winding, the secondary winding being connected to a transmitting device, which is designed to impress a communication signal onto the secondary winding of the communication transformer, and the primary winding being connected to one of the direct voltage lines in order to feed a communication signal transformed by the communication transformer to one of the direct voltage lines. In order to detect, in the assembly, the arc signal caused by an arc, the secondary winding is connected to an arc detection unit, which is designed to detect an arc signal transformed by the communication transformer.

Arc detection

To recognize a fault in an arrangement including a transformer having a primary winding connected in series with a DC voltage line and a secondary winding coupled magnetically to the primary winding, and including an evaluation unit that processes a secondary signal on the secondary winding, a signal component at at least one frequency is determined from the secondary signal and a signal level of the signal component is compared with a signal threshold. The fault is detected when the signal level falls below the signal threshold.

AFCI self test

Circuit arrangementfor securely switching inverter devicesof a system by a common emergency switchwhich is connected to a switching signal inputof one of the inverter deviceswhich is configured as a master of the system and comprises a switching signal output, other inverter devicesof the system configured as a slave being connected to the one inverter device via switching signal lines, wherein the inverter devicesconfigured as a slave together with the inverter deviceconfigured as a master form a switching chain which is automatically switched upon actuation of the emergency switch

Circuit arrangement for switching inverter devices

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Pettenbach, Austria

Stefan Breuer