Apparatus for rapid recognition of short-circuits

摘要

The invention relates to a configuration for rapid detection of short-circuits and for generating an electrical trigger command with an electronic measuring and processing configuration for current values, which compared in a digital comparison circuit with predetermined limit values transmits the trigger command. The measuring configuration determines the current over time as well as the voltage of the grid and the resulting complex impedances and power. In addition to segmentation, standardization and scaling of the current and voltage values, a cross correlation function as well as the respective product and quotient of the Fourier transforms of the voltage and the current for frequency ranges associated with each other are determined, so that a respective power and impedance spectrum are obtained for evaluating the state of the installation.