DEVICE FOR DETECTING AN ISOLATION FAULT FOR TESTING AN ISOLATION FAULT IN CRITICAL CONDITIONS

摘要

The invention relates to a device comprising: a bridge circuit comprising: first to fourth nodes (461, 462, 463, 464), the first and third nodes being connected to a DC voltage source; a first branch connecting the first and second nodes; a second branch connecting the second and third nodes; a third branch connecting the first and fourth nodes; a fourth branch connecting the third and fourth nodes; a fifth branch connecting the second and fourth nodes, comprising a capacitor (421) connected between the second and fourth nodes; a circuit (40) controlling switches for successively: a) closing switches for charging said capacitor; b) maintain a closed switch and the other switches open; a circuit measuring (431) the current flowing through said capacitor (421); a circuit (43) determines the amplitude of an insulation fault as a function of a current measured during step b).