Harmonic Ratio and Detrended Fluctuation Analysis Aided Reliable Estimation of contamination Level On Outdoor Suspension Insulators

The Suspension insulator is an indispensable component in a power system network. With the increasing electricity demand, it's the utility's responsibility to provide reliable power to the consumer. Thus, condition monitoring of overhead insulators is necessary because contaminants present in the environment cause insulation flashover and affect the power system operation. In the current work, an 11kV porcelain disc insulator is used, artificially contaminated. After that, Detrended Fluctuation Analysis (DFA) and Harmonic Ratio method are applied to estimate the contamination level using surface leakage current data.