Circuit arrangement for voltage testing and partial discharge capture

A circuit arrangement for voltage testing and partial discharge capture in a single-phase or multi-phase medium-voltage or high-voltage installation, comprising:

• one or a plurality of conductor signal inputs, each of which is configured for coupling to a respective capacitive coupling electrode that is coupled to a respective conductor of the single-phase or multi-phase medium-voltage or high-voltage installation;
• at least one voltage testing unit coupled on an input side to the or an assigned one of the conductor signal inputs of the circuit arrangement and configured for threshold-based voltage state capture with respect to the assigned conductor;
• at least one partial discharge detector unit configured for partial discharge detection with respect to the conductor or an assigned one of the conductors and comprising a partial discharge detector circuit and a partial discharge display circuit coupled on an input side to a signal output of the partial discharge detector circuit;
• an energy supply for the partial discharge detector unit comprising at least one of:
• a first energy supply circuit configured to supply the partial discharge detector circuit with energy from the conductor signal input or one of the conductor signal inputs of the circuit arrangement or a second energy supply circuit configured to supply the partial discharge display circuit with energy from the conductor signal input or one of the conductor signal inputs of the circuit arrangement;
• and
• a partial discharge connection path configured to couple an input side of the partial discharge detector circuit to an earth side of an installation system capacitance that is electrically parallel to the capacitive coupling electrode.