Device for estimating the impedance of an electric earth connection, associated estimation method and electric power supply system

摘要

The device according to the invention for estimating the impedance of an ground connection, the ground connection being connected to the ground of an alternating electric network (14) comprising a phase connected to an electric phase conductor and a neutral connected to an electric neutral conductor, comprises:
an electrical component having a predetermined value impedance positioned between the phase conductor and the ground connection;a first sensor capable of measuring a first value of a first property between the phase conductor and the ground connection and a second value of the first property;a second sensor capable of measuring a first value of a second property between the neutral conductor and the ground connection and a second value of the second property; anda computation member computing the impedance of the ground connection.

主权项

1. A device for estimating an impedance of an electric ground connection, the ground connection being connected to a ground of an alternating electric network, the alternating electric network comprising a phase connected to an electric phase conductor and a neutral connected to an electric neutral conductor, the device being configured to be connected to the phase conductor, the neutral conductor and the ground connection, the device comprising:
an electrical component having an impedance with a predetermined value, the electrical component being positioned between the phase conductor and the ground connection; a switch configured to electrically isolate the electrical component of the phase conductor in an open state, and to electrically connect the electrical component to the phase conductor in a closed state; a first sensor configured to measure a first value of a first electrical property between the phase conductor and the ground connection when the switch is in the open state, and a second value of the first electrical property when the switch is in the closed state; a second sensor configured to measure a first value of a second electrical property between the neutral conductor and the ground connection when the switch is in the open state, and a second value of the second electrical property when the switch is in the closed state; and a computation member configured to compute the impedance of the ground connection from the predetermined value of the impedance of the electrical component and values of the first and second measured electrical properties.