Title :
The characteristics of partial discharge from particles in GIS
Author :
Visintin, M. ; Niemeyer, L. ; Rabach, G.
Author_Institution :
Dept. of Electrical Eng., Trieste Univ., Italy
Abstract :
The characteristics of partial discharges (PDs) generated by metallic particles in compressed SF6 have been studied. PD measurements have been obtained under AC stress in a uniform electric field configuration, with a protrusion that allowed one to measure directly the true PD pulse charge. Several gap configurations have been considered among which dielectric surfaces have been placed in the proximity of the protrusion, to study the effect of spacers on PD activity. Different measurements were carried out including phase resolved partial discharge analysis. An interpretation of the data is given, based on previously published discharge models and a tentative explanation of some physical mechanisms is presented. Moreover an approximate scaling law has been verified, which relates the PD charges to the experimental parameters (protrusion dimensions, gas pressure and electric field). The phase distribution of the PD pulses is presented and discussed
Keywords :
SF6 insulation; gas insulated switchgear; partial discharges; switchgear testing; AC stress; GIS; SF6; compressed SF6; dielectric surfaces; gap configurations; gas pressure; metallic particles; partial discharge; phase resolved analysis; protrusion dimensions; scaling law; spacers; uniform electric field configuration; Character generation; Charge measurement; Current measurement; Dielectric measurements; Electric variables measurement; Geographic Information Systems; Partial discharge measurement; Partial discharges; Pulse measurements; Stress measurement;
Conference_Titel :
Electrical Insulation, 1994., Conference Record of the 1994 IEEE International Symposium on
Conference_Location :
Pittsburgh, PA
Print_ISBN :
0-7803-1942-7
DOI :
10.1109/ELINSL.1994.401512
