FAULT DETECTION DEVICE ON A BURIED ELECTRIC POWER DISTRIBUTION NETWORK

摘要

A fault detection device on a buried electric power distribution network (1) comprises an electronic circuit (6) which receives a signal representative of the homopolar voltage and a signal representative of the homopolar current of the line being monitored, said electronic circuit detecting transient changes in the homopolar current by comparing the sign of the homopolar current with that of the homopolar voltage. The homopolar current sensor consists of one or more toroidal coils (2) and the voltage sensor consists of a capacitor (9) connected between the common terminal (8) of capacitive divider capacitors (7) and ground.