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Distributed measurement of conductor temperatures in mine trailing cables using fiber-optic technology.

Authors
Dubaniewicz-TH Jr.; Kovalchik-PG; Scott-LW; Fuller-MA
Source
IAS '96: Conference Record of the 1996 IEEE Industry Applications Conference: Thirty-first IAS Annual Meeting, October 6-10, 1996, San Diego, California. Piscataway, NJ: Institute of Electrical and Electronics Engineers, 1996 Oct; 4:2480-2483
NIOSHTIC No.
20031168
Abstract
Mine trailing cables operated above safe thermal limits can cause premature insulation failure, increasing electrocution and fire hazards. Previous U.S. Bureau of Mines Pittsburgh Research Center research showed that, under static test conditions, electrical current levels permitted under present regulations may not limit cable temperatures to less than the 90 degree C. rating of reeled trailing cable. Continuing research under the National Institute for Occupational Safety and Health (NIOSH) addresses thermal characteristics of reeled trailing cable under dynamic test conditions more representative of field conditions, where operators constantly reel in and pay out cable. This research is in support of efforts by industry associations and the Mine Safety and Health Administration to establish safety guidelines for cyclically rated reeled machines. This paper describes a unique approach to measuring temperatures within reeled cable under dynamic test conditions. Fiber -optic sensors embedded within the metallic conductors measure temperatures at 1-m intervals along the entire length of cable. Temperature measurements are reported to be accurate to within plus or minus 1 degree C. The test setup requires access to only one end of the trailing cable, allowing researchers to freely reel in and pay out cable while temperature measurements are made, simulating field conditions. Manufacture of a fiber-optic-embedded trailing cable is described, along with initial test results that indicate the fiber-optic approach is viable.
Keywords
Mining-industry; Control-technology; Thermal-decomposition; Electrical-insulation; Fire-hazards
Publication Date
19961001
Document Type
Conference/Symposia Proceedings
Fiscal Year
1997
NTIS Accession No.
NTIS Price
ISBN No.
0780335449
ISSN
0197-2618
NIOSH Division
PRL
Source Name
IAS '96: Conference Record of the 1996 IEEE Industry Applications Conference: Thirty-first IAS Annual Meeting, October 6-10, 1996, San Diego, California
State
PA
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