Les Cables De Lyon

Christian Girard

Jean-Luc Hourtane

Michel Esculpavit

A device for protecting a polyphase electric power line against high transient overvoltages comprises at least two stages in series, the first stage being provided with a spark-gap and a decoupling inductor and being followed by a stage having a bridge limiter including two oppositely-biased power diodes each connected in series with a high-value capacitor, a time-delay contactor being placed at the terminals of each power-diode/capacitor assembly so as to permit charging of the capacitors through a resistor and auxiliary diodes and then to permit cut-off of the bridge limiter. The protection device has only one pair of high-value capacitors each connected in common in series with one of the power diodes of each phase, an auxiliary diode being associated with each capacitor.

Device for protecting an electric power line against high transient

A surge protection device comprising an inductor and a limiting bridge stage (10) with two oppositely biased power diodes (15,16) each connected in series with a high-valued capacitor, features an inductor connected in a first stage including a spark-gap (6) to ensure decoupling by the inductor from the second limiting bridge stage. A time-delay relay (10A) is disposed at the terminals of each power diode/capacitor combination to enable charging of the capacitors through a resistor (20) and auxiliary diodes (21, 22) connected between the relay and the power line on the one hand and between the power diode and the capacitor on the other hand, and the subsequent blocking of the bridge once the capacitors have been charged.

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Argenteuil, France

Christian Girard