High voltage cable and pipe precision sheath water penetration fault detection and location procedure compares voltages measured between sensor cable and ground cable for constant current

摘要

A high voltage cable and pipe precision sheath water penetration fault (F) detection and location procedure compares the voltage measured (Uij) by sensors (1, 2, 3) between a sensor cable and earth return cable (4, 5, 6) under the sheath when a constant or variable frequency voltage source (7) is applied and adjusted to provide a constant current.