The Effects of Cable Capacitance on Longwall Power Systems

Details

• Personal Author:
  Basar J ; Kohler, Jeffrey L. ; Novak T ; Sottile, Joseph
• Description:
  Utilization voltages used on longwall equipment operating in U.S. coal mines have increased steadily over the past 15 years from 1,000 V to 4,160 V. This voltage increase has directly influenced the 200% gain in overall longwall productivity from 1987 to the present. The transition from medium voltage (661 V-1,000 V) to high voltage (>1,000 V) has permitted significant increases in face widths and equipment sizes. Longwall systems with total connected loads of over 5,000 hp are now common, and all U.S. longwalls now use high-voltage equipment, with most using 4,160 V. Shielded cables, which have significantly more capacitance than unshielded cables, are required for high-voltage applications in the mining industry. This capacitance can have detrimental influences on system overvoltages and relay selectivity during ground-fault conditions if the values for the grounding resistor and the ground-fault-relay pickup settings are improperly chosen. These issues are addressed in this paper. [Description provided by NIOSH]
• Subjects:
  Coal Coal Mining Electricity Mining Occupational Health Safety
• Keywords:
  Coal-mining Electrical-safety Electrical-systems Ground-fault-relaying Hazards High-resistance-grounding Longwall-mining Mining-equipment Mining-industry Safety-research
• Series:
  Mining Publications
• ISSN:
  0093-9994
• Publisher:
  Institute of Electrical and Electronics Engineers, Inc.
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Kentucky ; OSHA Region 3 ; OSHA Region 4 ; Pennsylvania ; Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PRL - Pittsburgh Research Laboratory
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  40
• Issue:
  5
• NIOSHTIC Number:
  nn:20026478
• Citation:
  IEEE Trans Ind Appl 2004 Sep/Oct; 40(5):1406-1412
• Contact Point Address:
  NIOSH Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
• Email:
  JKohler@cdc.gov
• Federal Fiscal Year:
  2004
• Peer Reviewed:
  True
• Source Full Name:
  IEEE Transactions on Industry Applications
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:9811ae4591bfbb7d1ac3736bedb4883c46a914fab96ac178e4bb86a2d0197204c2f80ff3577b6bd63731f8c50df640220d466ebf27e98c6d43f9820ee91936e0
• Download URL:
  https://stacks.cdc.gov/view/cdc/221001/cdc_221001_DS1.pdf
• File Type:
  [PDF - 1.06 MB ]