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Title: Circuit arrangement for an electric melting furnace

Abstract: The invention concerns a circuit arrangement for use with an electric melting furnace of a type which is fed by a converter, the latter converter being equipped with thyristors and controlled by a control unit and a series-connected current regulator. More specifically, in accord with the invention, the circuit arrangement is provided with monitoring circuits for monitoring the operation of the thyristors. These monitoring circuits, in turn, generate signals which control switches for selectively short-circuiting the feedback resistors of the regulator.


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Inventors: Timpe, Wolfgang (Erlangen, DT)

Application Number: 577851
Filing Date: 1975-05-15
Publication_date: 1976-08-10
Assignee: Siemens Aktiengesellschaft (Munich, DT)
Primary Class(es): 363/54 330/86
Other Classes:
US Patent Ref:
3045168Jul, 1962Fellendorf321/14.
3045224Jul, 1962Colaiaco321/14.
3370216Feb, 1968Bowar et al.340/248.
3497830Feb, 1970Colton et al.330/86.
3764885Oct, 1973Buxbaum et al.321/13.

Other Refs: 237,997
Jul, 1969SU

Primary Examiner: Shoop, William M.
Assistant Examiner:
Attorney: Kenyon & Kenyon Reilly Carr & Chapin