Measuring probe and circuit arrangement for the electrical detection of partial discharges

摘要

The invention relates to a measuring probe and circuit arrangement for the electrical detection of partial discharges in electrical equipment. It is the aim of the invention to enable partial discharges in electrical equipment to be detected without having to disconnect system components. The invention is based on the object of ensuring a detection of partial discharge signals of equipment under high voltage without high-voltage coupling capacitors. This object is achieved by the measuring probe consisting of a three-electrode system connected to one another via a compensation network, in which system, on the side facing the device under test, a compensation electrode is arranged between a measuring electrode and a reference electrode constructed in the manner of a housing. Within the reference electrode, two differential amplifiers are integrated, the rise time of which is very small compared with the duration of the TE pulses and is within the nanosecond range. <IMAGE>