Title :
X-ray irradiation induced discharge of spherical void in epoxy resin
Author :
Hikita, Masayuki ; Kozako, Masahiro ; Takada, Hajime ; Hayashi, Masayuki ; Hirose, Tatsuya ; Nakamura, Yusuke ; Higashiyama, Masakazu ; Nakamura, Shuhei ; Umemura, Tokihiro
Author_Institution :
Kyusyu Inst. of Technol., Kitakyushu, Japan
Abstract :
It is crucial for proper insulation design of cast resin transformer to consider voids and delamination which might exist in cast molding process and/or under long-term operation because of several surface boundaries between resin and conductor. Should such defects in the insulation system exist, it would lead to reduction of the life of the apparatus. In this report, we investigate the relation between the void size and apparent charge of partial discharge (PD) occurring in a model simulating the insulation system of cast resin transformer. It is also important to determine necessary PD detection sensitivity of PD test in a factory as well as in a field. In addition, we investigate X-ray irradiation induced discharge of spherical void in epoxy resin. Physical consideration of the effect of X-ray irradiation on void discharges in epoxy resin was also made. Time lag of void discharges in epoxy resin was also made with attenuation of X-ray irradiation dose considered.
Keywords :
conductors (electric); delamination; epoxy insulation; moulding; partial discharges; power transformer insulation; X-ray irradiation induced discharge; cast molding; cast resin transformer; conductor; delamination; epoxy resin; insulation design; insulation system; partial discharge; spherical void; void discharges; Discharges; Electrodes; Epoxy resins; Insulation; Partial discharges; Radiation effects; X-ray irradiation; cast resin transformer; discharge time lag; partial discharge;
Conference_Titel :
Electrical Insulation Conference (EIC), 2011
Conference_Location :
Annapolis, MD
Print_ISBN :
978-1-4577-0278-5
Electronic_ISBN :
pending
DOI :
10.1109/EIC.2011.5996199