Method for interference current and state monitoring in rail vehicles

A method for forming output signals of an interference current monitor or of a state monitor of an electrical rail vehicle with current being drawn from a power grid, and optionally a current also being delivered back into said power grid, via a current collector, the state monitor identifying and signaling not only interference currents but also further fault states, and the method having the steps below:

• a) detection by measurement and digitization of the vehicle current flowing via the current collector, and
• b) digital processing of the detected vehicle current with determination of spectral density of interference currents, a multirate signal processing being carried out, and only one response threshold being used in order to evaluate the spectral density, in order to form said output signals.

A method for forming output signals of an interference current monitor or of a state monitor of an electrical rail vehicle with current being drawn from a power grid, and optionally a current also being delivered back into said power grid, via a current collector, the state monitor identifying and signaling not only interference currents but also further fault states, the method having the steps below:

• a) detection by measurement and digitization of a measurement quantity which makes it possible to infer vehicle states which lead to interference currents, and
• b) digital processing of the measurement quantity with determination of spectral density of interference values of said measurement quantity, a multistage system of response thresholds being used to evaluate the spectral density, in order to form said output signals.

A method for forming output signals of an interference current monitor or of a state monitor of an electrical rail vehicle with current being drawn from a power grid, and optionally a current also being delivered back into said power grid, via a current collector, the state monitor identifying and signaling not only interference currents but also further fault states, and the method having the steps below:

• a) detection by measurement and digitization of a measurement quantity which makes it possible to infer vehicle states which lead to interference currents, and
• b) digital processing of the measurement quantity with determination of spectral density of interference values of the measurement quantity, a multirate signal processing being carried out, and only one response threshold being used in order to evaluate the spectral density, in order to form said output signals.

A method for forming output signals of an interference current monitor or of a state monitor of an electrical rail vehicle with current being drawn from a power grid, and optionally a current also being delivered back into said power grid, via a current collector, the state monitor identifying and signaling not only interference currents but also further fault states, and the method having the steps below:

• a) detection by measurement and digitization of the vehicle current flowing via the current collector and an other measurement quantity which makes it possible to infer vehicle states which lead to interference currents, and
• b) digital processing of the detected vehicle current and said other measurement quantity with determination of spectral density of interference currents, and of interference values of the other measurement quantity, a multirate signal processing, being carried out, and only one response threshold being used to evaluate the spectral density, in order to form said output signals.