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AssigneeTechnische UniversitäT Wien
InventorThomas Wolbank
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The invention relates to a method and a device (1) for the online-detection of a deterioration in the state of an insulation in an electric machine (2). A stepped voltage is applied to the winding(s) (3) of the machine (2) with the aid of a converter (41), and the current (i) induced in this manner, and/or the time derivative (di/dt) thereof, is acquired as a measurement signal with the aid of at least one sensor (6, 7, 8) and is then oversampled with a frequency higher than the frequencies characteristic for settling. The signal obtained by said oversampling is then evaluated with regard to parameters of the settling process such as overshooting (Ah) and/or natural frequency (1/ΔT) and/or a damping constant, in order to detect any deterioration in the insulation.
1-15. (canceled)
A method for the online detection of a deterioration in insulation in an electrical machine comprising:
A device for the online detection of a deterioration in the state of an insulation in an electrical machine, wherein a supply circuit having an inverter is associated with the electrical machine and at least one sensor is arranged in a current supply conductor to the machine, which sensor, on application of a stepped voltage during use, detects a current (i) induced in at least one winding of the machine or a time derivative (di/dt) thereof as a measurement signal, wherein the sensor is connected to an oversampling device for oversampling the measurement signal at a comparatively high frequency relative to transient processes and samples obtained are supplied to a computer unit for determining at least one characteristic parameter of a transient process on application of stepped voltage in order to detect a possible deterioration of an insulation during use.
Dependencies are inferred from the claim text.