| Title |
A Study Vertical Surface Discharge Characteristics of the Shape Change of the Solid Insulation with the Same Creepage Distance of Dry-Air |
| Authors |
Jong-Cheul Jeon ; Byung-Ju Choi ; Sung-woo Bae ; Kwang-Sik Lee ; Won-Zoo Park |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2016.30.1.072 |
| Keywords |
Dry-Air ; Solid Insulation ; Surface Discharge ; Dielectric Polarization ; Creeping Distance ; Laminate |
| Abstract |
In terms of power components which use environmentally-friendly dry air that can substitute SF6, there have been studies on the electrical properties of the solid insulation "spacer" for the purpose of securing dielectric strength as they become smaller. This study laminated solid insulation to keep the creeping distance the same in the dry air and investigated vertical surface discharge characteristics by shape. The three sheets of disk-type solid insulation(Bakelite) were laminated in a manner to keep the creeping distance the same. The lamination was categorized as follows: "Type A" in which the insulations with the same disk diameter were laminated; "Type B" in which the insulations whose middle disk diameter was large were laminated; and "Type C" in which the ones whose middle disk diameter was small were laminated. For a vertical surface discharge experiment, dry air was injected into the test chamber depending on the shape of the laminated solid insulation, and chamber pressure was adjusted in a range of 0.1-0.6MPa. As volume decreased, surface discharging voltage by unit volume increased. This was because of dielectric polarization according to the structural characteristics of the shape of lamination. The highest surface discharging voltage was found in "Type C." |