Fronius International Gmbh

Franz Fischereder

Stefan Breuer

Christian Fasthuber

Andreas Luger

Bernd Hofer

Walter Spitzer

Mario Bairhuber

Reimar Pfeil

Juergen Pirchenfellner

Christoph Pernegger

Florian Gerstlacher

Thomas Grabner

Andreas Muehlberger

Jürgen Pirchenfellner

Andreas MÜHLBERGER

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

A method and a photovoltaic inverter determines the system capacitance of a photovoltaic system relative to ground. The voltage required for the measurement can be provided by the intermediate circuit in the form of the intermediate circuit voltage, and the measuring device is designed to actuate an input short-circuit switch for short-circuiting the DC input with the AC disconnector open, as a result of which the intermediate circuit voltage can be applied to the DC input in the reverse direction, and the measuring device is configured to determine the system capacitance from the temporal waveform of the measured voltage after the switch of the voltage divider is closed.

Method and photovoltaic inverter for determining the system capacity of a photovoltaic system to ground

A method and a photovoltaic inverter for determining the insulation resistance of a photovoltaic system relative to ground are provided. The voltage required for the measurement can be provided by an intermediate circuit in the form of an intermediate circuit voltage and a measuring device is designed to actuate an input short-circuit switch for short-circuiting a DC input with an AC disconnector open, as a result of which the intermediate circuit voltage can be applied to the DC input in the reverse direction. The measuring device is configured to record measured voltages with a switch of a voltage divider open and closed, and to determine the insulation resistance from the measured values of the two measured voltages recorded with the switch of the voltage divider open and closed.

Method and photovoltaic inverter for determining the insulation resistance of a photovoltaic system to ground

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

Franz Fischereder