PURPOSE: To reduce the load of a computer and to rapidly output a diagnostic result by providing a plurality of detectors or detection items and always monitoring the interior of machinery at a usual time by one of them and performing precise diagnosis by the other when abnormality is detected.
CONSTITUTION: The detectors 10, 20, 30 connected to analysers 40, 50, 60 are provided and the detector 10 is always selected as a monitoring one. For example, if the detector is a partial discharge pulse current detector, a detection level, a phase and a frequency band are provided as detection items. The detector 10 monitors the interior of machinery on the basis of the detection items and, when abnormality is detected, the interior of the machinery is precisely diagnosed by the other detectors 20, 30 using the detection items thereof. Herein, according to a purpose and necessity, the detector 20 or 30 can be also always selected as the monitoring one. Since the detection items of the detectors are selected to perform monitoring as mentioned above, load such that a computer 70 always processes a signal is reduced, and the rapid judge of abnormality and a rapid order can be issued.
ENDO FUMIMASA
ISHIKAWA TOSHIO
OZAWA ATSUSHI
