Arc detection

An assembly for transmitting a direct voltage from at least one direct voltage source via at least two direct voltage lines to at least one direct voltage sink, comprising:

• a communication transformer with a primary winding and a secondary winding, the secondary winding being connected in series to a transmitting device which is designed to impress a communication signal onto an input of 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,
• an arc detection unit connected to the secondary winding in order to detect an arc signal caused by an arc in the assembly, the arc detection unit being designed to detect an arc signal transformed by the communication transformer,
• a signal processing circuit is connected between the secondary winding and the arc detection unit, the signal processing circuit being designed to process a secondary alternating current flowing through the secondary winding for the arc detection unit, the secondary alternating current being composed of the communication signal and the transformed arc signal,
• wherein the signal processing circuit comprises a resistor and a capacitor which are connected in series, and the capacitor is connected in parallel to the secondary winding in order to generate a resonance circuit with the secondary winding, and
• an output of the secondary winding connected to the signal processing circuit between the capacitor and the resistor in order to achieve an attenuated communication signal with respect to the arc detection unit in relation to the transformed arc signal,
• wherein the arc detection unit is connected to the resistor in order to process a voltage across the resistor to detect the arc.