Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of ground fault indication
Patent
1995-06-22
1999-09-07
Regan, Maura
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of ground fault indication
324456, 239708, 361228, G01R 2726
Patent
active
059492350
ABSTRACT:
A system and method for detecting and controlling ungrounded parts during the electrostatic coating process in order to improve production flow, provide an overall cost saving by efficient use of the coating material and prevention of accidental fires and false shutdown during production. The system of the present invention comprises a detection system for detecting any ungrounded parts prior to entering a coating environment, such as a painting booth. The detection system in accordance with one embodiment, comprises an array of detectors, specifically, an ultraviolet sensor, a radio-frequency wave sensor, an acoustic sensor and a light sensor, which upon sensing specific characteristics generate representative signal waveforms. These waveforms are than compared with stored waveforms relating to profiles of sparking or corona discharge characteristics. Correlation circuits may correlate data obtained by two or more sensors in order to ensure that the spark or corona discharge is caused by an ungrounded part. In accordance with an alternative embodiment, the detection system comprises a measuring device, such as a sensitive electric field meter, for measuring the electrical potential field between each part to be coated and ground.
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Castleman David A.
Selstad Chris A.
Williams Anthony B.
Fire Sentry Corporation
Regan Maura
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