Method of locating faults on a cable

摘要

This invention concerns methods and devices for calibrating a partial discharge measuring device and for locating faults on cables. In the method, calibration signals, which can include a band-limited white noise, are used with a periodically repeated signal course. By averaging over a predetermined period duration (T) of the calibration signal, it is possible, in the case of a partial discharge measurement, to recalibrate the measuring device continuously during the measurement, and additionally on cables to determine the fault location with great precision.

主权项

1. A method of locating faults on a cable, comprising the steps of:
applying a signal to the cable, determining a group delay time of the signal along the cable, and determining a fault location on the basis of a ratio between the group delay time and a delay time of partial discharge pulses which occur on the cable.