@article{oai:nagoya.repo.nii.ac.jp:00010237,
 author = {Mansour, D.A. and Okusu, T. and Nishizawa, K. and Kojima, H. and Hayakawa, N. and Endo, F. and Okubo, H.},
 journal = {12th International Middle-East, Power System Conference (MEPCON 2008)},
 month = {Mar},
 note = {The high reliability, less maintenance and compact size of Gas Insulated Switchgears (GISs) have made them the primary choice for many utilities. However, sometimes insulation defects inside GIS can be a serious threat to safe  operation of GIS and can lead to costly disruption of supply. As insulation failure usually starts with partial discharge (PD)  activity, this paper investigates the differences in PD characteristics in SF_6 gas  among different types of defects. The defect types considered in this study are particles in a gas gap, particles adhered on a spacer surface and spacer/electrode detachment. Different experiments were made for sequential PD measurements using the system of PD-Current Pulse Waveform Analysis (PD-CPWA). The PD phase characteristics, PD pulse number and PD current  were analyzed for the different defect types. Also the ratio of voltage increment to phase increment at the next PD pulse appearance (Δu/Δφ pattern) was obtained and compared for each defect type. Experimental results show that  correct identification of defects can be achieved based on considered PD characteristics.},
 pages = {85--89},
 title = {Comparison of Partial Discharge Characteristics for Different Defect Types in SF6 Gas Insulation System},
 year = {2008}
}