Partial discharge sensor for a high voltage insulation monitoring device

摘要

The present invention relates to a partial discharge sensor for a high-voltage insulation monitoring device comprising a housing and located in the housing a measurement circuit for measurement of partial discharges in a high voltage system to be tested and a coupling capacitor having one electrode connected to the measurement circuit and the other electrode to a first high voltage conductor to be connected to a high voltage line of the system to be tested, wherein it further comprises a calibration circuit located in the housing and comprising a calibration capacitor having one electrode connected to the calibration circuit and the other electrode connected to said first or a second high voltage conductor to be connected to a high voltage line.

主权项

1. A partial discharge sensor for a high-voltage insulation monitoring device; comprising a housing and located in the housing a measurement circuit for measurement of partial discharges in a high voltage system to be tested and a coupling capacitor having one electrode connected to the measurement circuit and the other electrode to a first high voltage conductor to be connected to a high voltage line of the system to be tested,
wherein it further comprises a calibration circuit comprising a calibration capacitor having one electrode connected to the calibration circuit and the other electrode connected to said first or a second high voltage conductor to be connected to a high voltage line, wherein the coupling capacitor and the calibration capacitor are realized as one dual capacitor, wherein an electrode of the dual capacitor connected to the high voltage conductor is a common electrode to both, the coupling capacitor and the calibration capacitor, and wherein the measurement circuit comprises a signal transmission line and the electrical power for operation of the measurement circuit and the calibration circuit is supplied through the signal transmission line.