Moeller Gmbh

Klaus-Jochen Froehlich

Frank Berger

Matthias Fenner

Bernd Koehler

Eckhardt Pridoehl

A method for determining a remaining service life of switching contacts in an electric switching device. The method includes operating the switching contacts so as to produce structure-borne sound signals, capturing the structure-borne sound signals, performing a Fourier transform on the structure-borne sound signals in a plurality of discrete time windows so as to produce a sonogram, determining a plurality of function values using the sonogram, and evaluating the plurality of function values using an evaluation device. Also a electrical switching device including first and second switching contacts, a sound sensor configured to capture structure-borne sound signals produced by an operation of the first and second switching contacts, and an evaluation device configured to evaluate the first structure-borne signals so as to determine a remaining service life of the first and second switching contacts.

Method for determining the remaining service life of the switch contacts in an electric switching device and electric switching device with an evaluation unit for carrying out said method

A system includes a switching device, a sound device and an evaluation device. The switching device includes a housing and a contact system disposed in the housing, the contact system including a contact piece carrier and a contact piece disposed on the contact piece carrier. The sound device produces and captures structure-borne sound waves so as to determine an equivalent criterion for determining the remaining service life of the contact piece. The evaluation device evaluates the equivalent criterion.

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Dresden, Germany

Klaus-Jochen Froehlich