Magnetic and electric antennas calibration for partial discharge charge estimation in gas-insulated substations

There are no accepted procedures that quantify the apparent charge of partial discharge (PD) in gas-insulated substations (GIS). This paper proposes a calibration method for PD estimation using unconventional electromagnetic sensors: magnetic loop antenna (inductive coupler) and an electric (capacitive coupler.) The procedure is intended voltage double integral method, which reviewed antennas extended antennas. By injecting low-frequency sinusoidal signals, constants determined two different test setups: first one being testbench where characteristic impedance matched second full-scale 420 kV GIS. validated three ways: with calibrated pulse testbench, GIS, defects revealed frequency limit range dependent on GIS length sensor’s signal-to-noise ratio. validation methods showed low errors antennas, demonstrating applies to any electric/magnetic detector derivative response. research paves way better insulation monitoring sensor harmonization. © 2017 Elsevier Inc. All rights reserved.