Patent ID: 9632131
Date: 2017-04-25
CPC Classifications: G01R,H02H

Claim:
1. A method for monitoring and measuring an insulation resistance in ungrounded and grounded power supply systems, said method comprising the method steps of: generating a periodic measuring signal with increased interference resistance against interference signals, wherein the measuring signal is constructed as a multi-frequency signal using a square pulse sequence, a square pulse that forms the sequence being divided into m portions of equal length, each of the m portions being binarily set, in an ordered manner, either in a unipolar manner to 0/1 or in a bipolar manner to −1/+1, Fourier coefficients for selected harmonics being calculated for each of the 2m possible square pulse sequences, the square pulse sequence being selected that fulfils the predefined requirements regarding a spectral composition of the square pulse sequence; coupling in the measuring signal between active conductors of a power supply system to be measured and ground; and detecting and evaluating measured values of the measuring signal by registering said measured values of the measured signal by a measuring device configured to monitor the insulation resistance of the power supply system.