Title :
Dielectric characteristics of static shield for coil end of gas-insulated transformer
Author :
Inoue, T. ; Inui, A. ; Teranishi, T. ; Murase, N. ; Ohshima, I. ; Toda, K.
Author_Institution :
Toshiba Corp., Kawasaki, Japan
Abstract :
The authors discuss the impulse breakdown characteristics of insulation models simulating static shields for coil ends of SF6 gas-insulated transformers. If a filler made of elastomer material is fitted closely on the covered electrode to eliminate gas gaps between the filler and the covered electrode, the impulse breakdown voltage of the static shield is higher than with gas gaps. If a low-permittivity filler is used, the impulse breakdown voltage of the static shield is still higher. The breakdown voltage can be explained by considering that the breakdown is caused by small gas gaps between the filler and the covered electrode. The dielectric strength of the coil end can be increased by applying a static shield with an elastomer filler to the gas-insulated transformer
Keywords :
elastomers; electric strength; gaseous insulation; organic insulating materials; power transformers; sulphur compounds; transformer insulation; SF6 insulation; coil end; dielectric characteristics; elastomer filler; elastomer material; gas gaps elimination; gas-insulated transformer; impulse breakdown characteristics; impulse breakdown voltage; insulation models; low-permittivity filler; static shield; Breakdown voltage; Coils; Dielectrics and electrical insulation; Electric breakdown; Electrodes; Gas insulation; Positron emission tomography; Power transformer insulation; Solids; Sulfur hexafluoride;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1991., Proceedings of the 3rd International Conference on
Conference_Location :
Tokyo
Print_ISBN :
0-87942-568-7
DOI :
10.1109/ICPADM.1991.172274
