An Auto-Calibration Method for a Sensor Concept for Measuring Voltage with Overhead Line Indicators

The rapid localization of ground faults in compensated overhead line networks at the medium-voltage level presents challenges for power supply companies. Existing fault detection methods cannot be used in overhead line indicators because the high-precision voltage measurement required for this, is not yet available with state-of-the-art technology. Motivated by this problem, a sensor concept for voltage measurement with overhead line indicators is presented. The innovative calibration procedure compensates for the disturbing influence of the overhead line arrangement with knowledge of the boundary conditions. It is analysed and successfully validated in realistic laboratory setups.