H - Electricity – 02 – H
Patent
H - Electricity
02
H
335/2, 348/43
H02H 11/00 (2006.01) B60M 3/04 (2006.01) G01R 19/00 (2006.01) H02H 3/087 (2006.01)
Patent
CA 1246697
ABSTRACT OF THE DISCLOSURE DC power control system for use in an electric vehicular system has DC power supply and power conductors. A meter relay in a control unit enclosure displayably measures the DC current in the conductors and simultaneously estab- lishes an overcurrent limit for tripping out the conductors when the limit is exceeded. Meter calibration and tripping function are testably by a test switch for substituting an adjustable DC test source in place of a conductor meter shunt to the meter relay. Application of DC to shorted power con- ductors is prevented by preliminary low power DC isolated AC relaying across the conductors. The test switch substitutes a low resistance for the power conductors to also test the AC tripping action. If the power conductors are already ener- gized from a remote power supply, the local power supply is prevented from access by DC responsive relaying during a pre- liminary time period. After a problem is detected, the con- trol system locks out so as to demand operator attention if the problem persists.
486208
Evans Vernon C.
Gill Ronald P.
Peabody Coal Company
Smart & Biggar
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