Patent ID: 6518769
Filing Date: 2003-02-11
Classification: G01R

Abstract:
A method for the electrical monitoring of an electrode lead of a bipolar high-voltage d.c. transmission system, the electrode lead being divided at a branch point into two lines, the method comprising:generating an electrical pulse signal that is asymmetric with respect to ground potential and outputting the generated asymmetric pulse signal and a trigger signal for output of the generated pulse signal; converting the generated asymmetric pulse signal into a pulse signal that is symmetric with respect to ground potential in push/pull mode; injecting the push/pull mode pulse signal into the two lines of the electrode lead; forming a dynamic target echo curve by recording an actual echo curve produced as a function of the injection of the push/pull mode pulse signal; forming an actual echo curve by real-time recording for a given time of an echo signal produced as a function of the injection of an additional puss/pull mode pulse signal; forming an echo difference curve by deriving a difference between the recorded actual echo curve and the dynamic target echo curve; checking the echo difference curve for amplitudes that go outside a first tolerance band constructed from two predetermined constant limit curves arranged symmetrically with respect to a time axis; generating a fault signal as soon as at least one case of exceeding limits of the first tolerance band is present; and shutting down the pulse generation as soon as one fault signal is present.