Motor current signature analysis for determining operational readiness of motor-operated valves (MOVs)

Conference · Thu Jan 01 04:00:00 EST 1987

OSTI ID:6498009

Kryter, R C; Haynes, H D

Motor current signature analysis (MCSA) is a novel diagnostic process for condition monitoring of electric-motor-driven mechanical equipment (e.g., pumps, motor-operated valves, compressors, and processing machinery). The MCSA process identifies, characterizes, and trends over time the instantaneous load variations of mechanical equipment in order to diagnose changes in the condition of the equipment (e.g., due to degradation or service wear), which, if allowed to continue, may lead to failure. It monitors the instantaneous variations (noise content) in the electric current flowing through the power leads to the electric motor that drives the equipment. The motor itself thereby acts as a transducer, sensing both large and small, long-term and rapid, mechanical load variations and converting them to variations in the induced current generated in the motor windings. This motor current noise signature is detected, amplified, and further processed as needed to examine its time domain and frequency domain (spectral) characteristics. The operational principles of MCSA and the nonintrusive data collection apparatus and procedure used with MOVs will be described. Data collected from MOVs in both laboratory and in-plant environments will also be shown to illustrate the ability of MCSA to ''see'' the detailed inner workings of the valve and operator and thus to detect degraded performance at an incipient stage. (Set of 18 vugraphs)

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6498009
• Report Number(s): CONF-870598-1-Abst.; ON: DE87009830
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220200* -- Nuclear Reactor Technology-- Components & Accessories
CONTROL EQUIPMENT
CURRENTS
DIAGNOSTIC TECHNIQUES
ELECTRIC CURRENTS
ELECTRIC MOTORS
EQUIPMENT
FLOW REGULATORS
MONITORING
MOTORS
NUCLEAR FACILITIES
NUCLEAR POWER PLANTS
POWER PLANTS
THERMAL POWER PLANTS
VALVES
WAVE FORMS