@article{oai:nagoya.repo.nii.ac.jp:00010240,
 author = {Hayakawa, Naoki and Okusu, Takashi and Nishizawa, Kanako and Kojima, Hiroki and Endo, Fumihiro and Yoshida, Masanobu and Uchida, Katsumi and Okubo, Hitoshi},
 journal = {International Conference on Condition Monitoring and Diagnosis (CMD 2008)},
 month = {Apr},
 note = {A metallic particle appeared in a gas insulated switchgear (GIS) sometimes adheres on a solid spacer surface. If the adhered metallic particle is exposed to a surge high voltage, a breakdown (BD) may be induced. Therefore, it is eagerly demanded to diagnose its risk correctly under the service voltage by partial discharge (PD) measurement. In this paper, particle-initiated surface PD characteristics were systematically studied in 0.4 MPa SF_6 gas by changing  the sizes of particles. PD inception voltage (PDIV), temporal change of PD current and the PD pulse number were analyzed in detail. Furthermore, comparing with PD characteristics of particles in a gas gap, the influence of the  solid insulator on the PD characteristics was clarified. It was found out that PD characteristics greatly changed with time owing to electric charges deposited on a spacer surface.},
 pages = {46--50},
 title = {Dependence of Partial Discharge Characteristics at Spacer Surface on Particle Size in SF_6 Gas Insulated System},
 year = {2008}
}