Possible application of the PD detection technique using a laser interferometer and pockels effect with a nonlinear characteristic analysis of the PDsignals

In this paper, a new partial discharge (PD) detection technique using a Poc kels cell is proposed. and considerable apparent chaotic characteristics ar e discussed. The PD was generated from a needle-plane electrode in air and was defected by using an optical measuring system with a Pockels cell. The optical measuring system was based on a Mach-Zehnder interferometer and con sisted of a He-Ne laser, a single-mode optical fiber, a 50/50 beam splitter and photo-detector. The presence of chaos in tile PD signals was investiga ted by examining the means of qualitative and quantitative information. For the former, the return map and the 3-dimensional strange attractor were dr awn in order to investigate the presence of chaotic characteristics relevan t to PD signals, detected through a Pockels sensor, in the normalized time ser ies. The presence of the strange attractor indicators the existence of fractal structures in it's phase space. For the latter, several dimension v alues of the strange attractor were verified sequentially. Throughout this paper, the chaotic characteristics regarding the PD signals under air are v erified.