Chaotic Analysis as a Tool for Sensing Long-Term Degradation of High Voltage Fibre Reinforced Plastic Core Used in Composite Insulators

The leakage current which flows on the surface of dielectric rods under high voltage involves a series of events which include partial arcing, discharges and corona, these phenomenon are highly non-linear. These sequence of events render the leakage current signal to be very much chaotic. In the present work, the process of delay-embedding is employed to study the phase-portrait of the signal, further Lyapunov Exponents are computed to characterize the chaotic nature of the leakage current. The main focus of the study is intended to understand the chaotic nature of leakage current behaviour over the ageing period and to determine the degree of degradation on the dielectric rod surface.