AC Drives for Drilling

ABSTRACT Until now direct-current motors fed by thyristor rectifiers have dominated as variable-speed drive systems for oil-drilling applications. During drilling of a test well at Rogaland Research Center in Stavanger, Norway, a new drilling system "The Power Swivel" was tested and the conventional DC motor/SCR system was replaced by an asynchronous motor fed by a GTO frequency converter. Whilst an enclosure of protection class Ex(P) is required for DC motors operating in hazardous area, asynchronous motors can also be built to protection class Ex(d), (e), or (n) for this type of application.

Related Organizations

Brown, Boveri & Cie
Switzerland

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