Power supply system for extraction machine, especially a drum-cu

Details Power supply system for extraction machine, especially a drum-cu Power supply system for extraction machine, especially a drum-cu

1974-12-09

1976-06-29

Miller, J. D.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

307 39, 317 18C, H02J 700, H02H 102

Patent

active

039671801

ABSTRACT:
Low voltage direct current power is provided on a mining machine that is supplied with high voltage alternating current by an external power cable. An intrinsically-safe battery is charged by a battery charger that is powered through a stepdown transformer by the high voltage current supplied to the machine only during the actual operation thereof. The battery powers two separate electrical systems and in one system low voltage current continuously powers essential electrical devices that must remain functional even though the mining machine is not performing a mining operation. The other electrical system powers electrical devices that are essentially operative only when the mining machine is operative and this system is automatically deenergized by a relay in the high voltage current supply line.

REFERENCES:
patent: 2784322 (1957-03-01), Johnson
patent: 3196316 (1965-07-01), Crom
patent: 3457491 (1969-07-01), Black et al.

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