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January 2000
Volume 52    Issue 1

Passive means to detect hot trolley insulators

Mining Engineering, 2000, Vol. 52, No. 1, pp. 24-28
Yenchek, M.R.; Hudson, A.J.


ABSTRACT:
Electrical trolley systems are used for mineral haulage and for the movement of personnel and supplies in nearly 50 mines in the United States. These mines are located mostly in southwestern Pennsylvania and West Virginia. These systems use a trolley wire energized with 300- or 600-V direct current. The current powers vehicles running on a network of permanently installed steel tracks. The bare copper trolley wire and a feeder wire are suspended approximately every 6 m (20 ft) from insulators that are anchored into the roof by bolts. The purpose of the insulators is to prevent current from flowing to the grounded return track via the overlying strata.


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