To avoid occurrence of wear and breakdown inside a machine, by monitoring electrostatic activity of machine's component for monitoring abnormal load which takes place with machine's component.
In a rotating machine such as a gear box, at least one electrostatic sensor 3 and a tacho-generator 2 are provided. The signal from the sensor 3 and the tacho-generator 2 is processed with a signal processing circuit 6, for monitoring abnormal interaction between a plurality of interacting components of the machine 1. The signal from the tacho-generator 2 may be utilized by the signal processing circuit 6 for generating average signal of electrostatic activity interacting across machine's cycle. Such average signal comprises increasing component related to electrostatic activity related to machine's cycle.
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