PROTECTION DEVICE FOR ELECTRICAL EQUIPMENT, MACHINPROTECTION DEVICE FOR ELECTRICAL EQUIPMENT, MACHINES AND INSTALLATIONS ES AND INSTALLATIONS

摘要

2080133 9214291 PCTABS00130 The device is intended to protect user power lines (1) connected to power supply lines (2). This device comprises: at least one resistance bridge (4) connecting the user power lines (1) and creating at one of its points (5) a determined potential, fixed during normal operation of the installation; an isolation means (6) amplifying the potential difference between this point (5) and the earth (3); a threshold circuit (7) connected to the output of the isolation and amplification means (6) and controlling a means of connection and disconnection (8) of the power supply lines (2) relative to the lines to be protected (1), in such a way that an abnormal variation of voltage on one of the electric lines (1) causes a variation of the potential of the point (5), this variation being detected by the threshold circuit (7). A processor (9) connected to the threshold circuit (7) allows digital processing of the electrical data relating to the lines (1) and the storage of this data in a memory (10), as well as the automatic reconnection of the user electrical lines (1 ) with the supply lines (2).