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Mining Publication: Early Detection of Insulation Failure in Electric Motors
Keywords: Electrical safety Motors Power centers
Original creation date: January 1993
Authors: GT Homce
Report of Investigations - January 1993
Download PDF Document (1.44 MB)
NIOSHTIC2 Number: 20023147
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9450, 1993 Jan; :1-26
A system capable of monitoring mine electrical power systems and detecting impending component failure could significantly improve power system safety and reduce unscheduled equipment downtime. Such monitoring would require a method of evaluating electrical parameters, calculated from terminal values, for indications of component deterioration. The U.S. Bureau of Mines has targeted electrical failure of squirrel cage induction motors and examined the use of mathematical models to aid in this evaluation. The initial stage of this work is complete, and has produced polynomial networks called adaptive learning networks (ALN's) that can detect and quantify winding insulation leakage simulated on laboratory motors. In this modeling process, empirical data from laboratory motors were used to select the electrical parameters most significant for assessing motor conditions, and mathematical expressions relating these parameters to simulate deterioration were formed. ALN's developed thus far can process readily measured motor terminal information and quantify power and current levels of laboratory-simulated leakage to within 1% and 3% of full load values, respectively, for motors in the 10- to 150-hp size range. The next stage of this research is validation of these ALN's for actual motor failures; this stage is currently underway, using accelerated life testing of laboratory motors.
Image of publication Early Detection of Insulation Failure in Electric MotorsReport of Investigations - January 1993
Download PDF Document (1.44 MB)
NIOSHTIC2 Number: 20023147
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9450, 1993 Jan; :1-26
See Also
The Brookwood Disaster and Electrical Requirements for Hazardous (Classified) Locations
Condition-Based Maintenance of Electrical Machines
Detrimental Effects of Capacitance on High-Resistance-Grounded Mine Distribution Systems
Distinguishing Motor Starts from Short Circuits through Phase-Angle Measurements
Effect of Three-Winding Transformer Models on the Analysis and Protection of Mine Power Systems
Motor Monitoring System for a Continuous Miner
Occupational Electrical Injuries in the United States, 1992-1998, and Recommendations for Safety Research
Practical Risk Assessment Guidelines for Identifying, Assessing, and Mitigating Stored Energy Hazards in Underground Coal Mines During and After a Mine Emergency
U.S. Bureau of Mines/NIOSH Mining Electrical Safety Research: A Legacy of Protection Against Shock, Fires, and Explosions
Understanding and Quantifying Arc Flash Hazards in the Mining Industry
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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