H - Electricity – 02 – H
Patent
H - Electricity
02
H
317/11, 348/42
H02H 3/00 (2006.01) H02H 3/17 (2006.01)
Patent
CA 1166681
68pd PDY 6522 MINE VEHICLE SAFETY APPARATUS Abstract of the Disclosure A mine safety system for use with a direct cur- rent power supply delivering power via a pair of conductors to the direct current load components of mining apparatus which includes a conductive frame electrically isolated from ground and at least one of the conductors. In the safety system, an alternating current generator transmits a predetermined frequency signal over the pair of conductors to the mining apparatus. A filter which passes the prede- termined frequency signal is disposed at the mining appara- tus in a shunt circuit with the load components, the filter thereby being connected to the generator. Circuitry moni- tors the impedance of the electrical load on the generator at the predetermined frequency and a contactor responsive thereto stops the delivery of power from the power supply to the mining apparatus upon the impedance of the electri- cal load on the generator at the predetermined frequency exceeding a predetermined level which exceeds the impedance of the shunt combination of the filter and load compon- ents. Switching circuitry disconnects the filter from the generator in response to the flow of significant current from one of the conductors to the mining apparatus frame, thereby increasing the impedance of the electrical load on the generator at the predetermined frequency to above the predetermined level, whereby delivery of power from the power supply to the mining apparatus is stopped.
391236
Gill Ronald P.
Hull John E.
Tucker Dempsey G.
Peabody Coal Company
Smart & Biggar
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