Mining Publication: Detection of Downed Trolley Lines Using Arc Signature Analysis
Original creation date: May 1997
A cost effective and practical system for monitoring hauling system electrical current patterns was developed. The aim was to reduce the hazards associated with electrical fault currents from fallen coal mining trolley hauling system lines. The current could result in local heating or arcing and thus increase the risk of a fire. Computerized electrical current analysis techniques were tested at several Pennsylvania coal mining sites on mining trolley hauling systems using a range of currents. Current readings were taken during all phases of the loading process, under normal (light, intermediate and heavy traffic) and during simulated arcing and bolted fault conditions. Voltage data collected from these trials were used to develop a microprocessor based fault detection algorithm, which field tests showed was 95% accurate. The frequency of the rectifier current and the imposed fault signal were used to detect arcing faults. The authors conclude that this improves the detection and extinguishing of self sustaining arcs thus minimizing fire risk.
Authors: JS Peterson, GP Cole
Report of Investigations - May 1997
NIOSHTIC2 Number: 00238991
Pittsburgh, PA: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, NIOSH, DHHS (NIOSH) Publication No. 97-123, Report of Investigations 9639 1997 May :1-13
See Also
- Analysis of Mine Fires for All U.S. Metal/Nonmetal Mining Categories, 1990-2001
- Analysis of Mine Fires for All U.S. Underground and Surface Coal Mining Categories: 1990-1999
- Determining the Root Causes of Flame Cutting and Welding Fires in Underground U.S. Coal Mines
- Effectiveness of Various Concentrations of an Inert Gas Mixture for Preventing and Suppressing Mining Equipment Cab Fires: Development of a Dual-Cab Fire Inerting System
- Focus on Prevention: Conducting a Fire Risk Assessment
- Ignition of Hydraulic Fluid Sprays by Open Flames and Hot Surfaces
- Innovative Strategies for Mine Fire Preparedness
- Performance-Based Fire Safety Designs for Self-Escape in Underground Mines
- Structural Analysis and Design of Seals for Coal Mine Safety
- An Underground Coal Mine Fire Preparedness and Response Checklist: The Instrument
- Content source: National Institute for Occupational Safety and Health, Mining Program