ACTIVE DEVICE FOR READING THE STATE OF A HIGH-VOLTAGE DRY CONTACT

摘要

The invention relates to an active device comprising: a first circuit (40) connecting an actuating contactor (21) and a resistor (22) to the terminals of a secondary winding (36) of a transformer (24) in series; a second circuit (41) connecting a capacitor (23, 25) to the terminals of a primary (36) or secondary (37) winding of said transformer (24); a third circuit (43) connecting a first divider bridge (33, 34), a referencing terminal (30), and a resistor (26) to a fraction (38) of said primary winding in series; a fourth circuit (44) connecting a second divider bridge (32, 35), said terminal (30), and said resistors (26) to the terminals of said primary winding in series; a fifth circuit (45) connecting the 'e-' and 'e+' inputs of an operational amplifier (27) to the midpoints of said first (33, 34) and second (32, 35) divider bridges, and connecting the output to said fraction (38) of the primary winding; and a measurement means (46).