JPH068844B

1. Process for the recognition and localization of defects in electrical installations, more particularly generators or power units, whereby at one or several points of the electrical installation partial discharge measurements or high-frequency measurements (HF 1a, HF 1b, HF 2a, HF 2b, HF 3, HF 4, HF 5, HF 6, HF 7a, HF 7b, HF 8), if necessary at all phases respectively, are carried out whereby the measured values are compared with one another or with calibrating signals and the place and type of the defect is inferred therefrom, characterized by the following features ; a) the measurements are carried out during the operation of the installation continuously or periodically at at least three points ; b) the electrical installation is simulated in a computer as a high-frequency network, whereby defects with their signals resulting therefrom at the measuring points can also be simulated ; c) upon the occurrence of measured values which indicate defects, these are compared to the simulated signal values for various defects and places of defect, more particularly with regard to frequency spectrum, running time, amplitude and/or phase relation ; d) the type and the place of the defect are detected from the simulated signal values that best correspond to the measured values, and from the appertaining simulated defects.