Partial discharge localization system based on wireless UHF sensors

Summary

Effective partial discharge (PD) localization can detect the insulation problems of the power equipment in substation and improve the reliability of power systems. Ultrahigh frequency (UHF) detection is a significant way for PD localization due to its excellent performance. Traditional UHF PD localization system mainly uses time-difference or angle information, which has unsatisfactory performance in practical application due to the high hardware cost and the influence of Non-Line-of-Sight (NLOS). The development of the wireless UHF sensors enriches the placement of the UHF sensor array. In this paper, we propose a novel PD localization system based on wireless UHF sensors. The received signal strength indicator (RSSI) fingerprint localization method is chosen as the framework of the proposed PD localization system, which is a scene analysis method with excellent environment adaptability. The proposed PD localization system consists of two stages. Firstly, in the offline stage, the RSSI fingerprint map is established by site survey and used to train the BP neural network. Secondly, in the online stage, when PD happens, the location of PD is estimated by BP neural network. Particle swarm optimization (PSO) algorithm is used to choose the initial weight of the BP neural network during the network training process. Two significant practical application problems of the proposed PD localization system are also discussed. Firstly, the PD heterogeneity is solved by normalization method. Secondly, the PD interference during the site survey in the offline stage is solved by clustering algorithm. A field test is designed and performed in substation to verify the effectiveness of the proposed PD localization system. The results show that, the mean localization error of the proposed PD localization system is 1.86 meters and 62.1% localization errors are less than 2 meters, which indicate that our proposed PD localization system has a great value in practical application.

Additional informations

Authors

CAMPOS DE AMORIM FILHO, NASCIMENTO BARBOSA, MARVAL, ESMERALDO, LOPES CARVALHO BATISTA

Keywords

Partial discharge, localization system, wireless UHF sensors, heterogeneity, BP-PSO