Importance

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Abstract

Apparatuses (10) comprise first circuits (1) for detecting problems in or near loads (111) powered via a cable (101) of a cable system and second circuits (2) for in response to detection results from the first circuits (1) changing a characteristic frequency of the cable system. The first circuits (1) may comprise detectors for detecting currents, voltages and impedances and the second circuits (2) may comprise signaling capacitors (21) and switches (22). Devices (30) for searching for problems in the cable system comprise third circuits (3) for measuring values of the characteristic frequency and fourth circuits (4) for comparing the measured values of the characteristic frequency with reference values. The devices (30) may comprise fifth circuits (5) for deriving from the measured values and from information about the apparatus (10) values of inductances of the cable system and sixth circuits (6) for converting the derived values into locations of the problems or into distances defining locations of the problems.

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First Claim