抄録
It is an urgent subject to establish a reliable diagnostic method for GIS. From this point, quite a few reserches have invetigated the characteristics of PD measurement in GIS such as relation between kinds of defect and PD signal, detectablity of various diagnostic means. There is, however, no data on realistic length of a particle like shorter than 10mm. This paper focused on the abave subject and a variety of characteristics have been obtained with changing kinds of defect, lengths of a particle and applied voltage levels as paramaters. The range or kind treated here is a free particle, a particle on spacer surface and a one on central conductor for the defect, 3mm, 5mm, 10mm, 20mm for the particle length, l.Opu, l.lpu, and 0.8times test voltage for the applied voltage level. Espacially, detectablity of short length particles were significant from a practical viewpoint.
