Possible Application of the PD Detection Technique Using a Laser Interferometer and Pockels Effect with a Nonlinear Characteristic Analysis of the PD Signals

Abstract

In this paper, a new partial discharge (PD) detection technique using a Pockels cell is proposed, and considerable apparent chaotic characteristics are discussed. The PD was generated from a needle-plane electrode in air and was detected by using an optical measuring system with a Pockels cell. The optical measuring system was based on a Mach-Zehnder interferometer and consisted of a He-Ne laser, a single-mode optical fiber, a 50/50 beam splitter, and photo-detector. The presence of chaos in the PD signals was investigated by examining the means of qualitative and quantitative information. For the former, the return map and the 3-dimensional strange attractor were drawn in order to investigate the presence of chaotic characteristics relevant to PD signals, detected through a Pockels sensor, in the normalized time series. The presence of the strange attractor indicates the existence of fractal structures in it's phase space. For the latter, several dimension values of the strange attractor were verified sequentially. Throughout this paper, the chaotic characteristics regarding the PD signals under air are verified.