The Effects of High-Frequency Residual Currents on the Operation of Residual Current Devices

This research investigates the effects of high frequency currents between 50 Hz and 150 kHz on operation Residual Current Devices (RCDs). Nowadays, increasing amount large power-electronic switching devices can be a source both harmonics (<2 kHz) supraharmonics (2-150 injected to grid. have several possibly lead unwanted tripping RCDs, due earth-currents that emitted by devices. The question is if also misoperation or fail-to-operate conditions for potentially leading serious safety risks. A set-up developed introduce highfrequency leakage currents. First, tripping-current RCDs tested under nominal conditions. Secondly, current non-nominal frequencies (between determined verify possibility false tripping. Lastly, RCD in presence high-frequency current. most important conclusion type AC an increased fundamental (50 Hz) when there are HFcomponents present. results risk.