Detector for flow abnormalities in gaseous diffusion plant compr

Details Detector for flow abnormalities in gaseous diffusion plant compr Detector for flow abnormalities in gaseous diffusion plant compr

1995-11-02

1998-06-16

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

340635, 340661, 324772, G08B 2100

Patent

active

057677808

ABSTRACT:
A detector detects a flow abnormality in a plant compressor which outputs a motor current signal. The detector includes a demodulator/lowpass filter demodulating and filtering the motor current signal producing a demodulated signal, and first, second, third and fourth bandpass filters connected to the demodulator/lowpass filter, and filtering the demodulated signal in accordance with first, second, third and fourth bandpass frequencies generating first, second, third and fourth filtered signals having first, second, third and fourth amplitudes. The detector also includes first, second, third and fourth amplitude detectors connected to the first, second, third and fourth bandpass filters respectively, and detecting the first, second, third and fourth amplitudes, and first and second adders connected to the first and fourth amplitude detectors and the second and third amplitude detectors respectively, and adding the first and fourth amplitudes and the second and third amplitudes respectively generating first and second added signals. Finally, the detector includes a comparator, connected to the first and second adders, and comparing the first and second added signals and detecting the abnormal condition in the plant compressor when the second added signal exceeds the first added signal by a predetermined value.

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