G - Physics
01
R
323/8
G01R 15/08 (2006.01) H02H 9/04 (2006.01)
Patent
CA 1248584
ABSTRACT OF THE DISCLOSURE The arrangement contains a power shunt which is followed by a first amplifier circuit and can be used for processing the output current of an inductive current transformer having a wide dynamic range. In order to provide high-precision conversion with smaller currents, the power shunt is connected in series with a precision shunt which is connected in parallel with an overvoltage protection circuit which contains a switchable semiconductor rectifier and a control circuit which has the effect that the rectifier changes to a conductive state if the voltage at the precision shunt reaches a limit value. The control circuit contains a symmetric voltage limiting element which is constructed as a pair of limiting diodes or as a fullwave rectifier, the output of which is con- nected to a reference diode. In order to check the switching state of the overvoltage protection cir- cuit, the series circuit consisting of the power shunt and the precision shunt is connected in parallel with a series circuit consisting of a first bridge resistor and a second bridge resistor which, together with the shunts, forms a balanced bridge circuit if the over- voltage protection circuit is inhibited, which bridge circuit is monitored by a window discriminator.
476891
Maschek Martin
Mastner Georg
Bbc Brown Boveri & Company Limited
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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