Patent ID: 9705493
Date: 2017-07-11
CPC Classifications: G01R,H02H,H03K

Claim:
1. A protection apparatus for an IT grid comprising a first and a second live lines, comprising a signal generator, which is designed to feed a first signal into at least one of the first and the second live lines; comprising a detection device, which is designed to detect the characteristic of the fed-in first signal in at least one live line; and comprising a control device, which is designed to analyze the detected characteristic and to output a disconnection signal when the analysis of the detected characteristic indicates that the first live line and the second live line are being touched by a living organism; wherein the control device has a memory, which is designed to store a multiplicity of digital values which are characteristic of the fed-in first signal in the at least one live line; wherein the control device comprises a transformation device, which is designed to implement a transform into the frequency range for the stored characteristic over time of the fed-in first signal and to output data which characterize the characteristic of the fed-in first signal in the frequency range: and wherein the control device comprises an evaluation device, which is designed to identify, in the output data, those frequencies at which the impedance of the live lines has local maxima or minima and to output the disconnection signal when at least one of the identified frequencies is in at least one predetermined frequency range for identification of the living organism.