Title :
Water treeing in oil impregnated paper insulation
Author :
Auckland, D.W. ; Chandraker, K. ; Shakanti, Z.
Author_Institution :
Dept. of Electr. Eng., Univ. of Manchester Inst. of Sci. & Technol., UK
Abstract :
Water absorption in oil impregnated paper insulation has been studied employing techniques used for the investigation of water tree growth in the presence of moisture and asymmetric alternating electrical fields. Damage caused to the paper, inferred from measurements of its tensile strength, varied according to the ionic content of the water used. The reduction in tensile strength suffered in the presence of deionized water was significantly less than when the water contained salts or methylene blue. Water was drawn through the oil impregnated paper, agglomerating around the pin electrode used to create the necessary asymmetric field, there forming classical water tree structures
Keywords :
composite insulating materials; insulating oils; moisture; paper; tensile strength; trees (electrical); asymmetric alternating electrical fields; damage; deionized water; ionic content; methylene blue; moisture; oil impregnated paper insulation; pin electrode; salts; tensile strength; water absorption; water treeing; Dielectrics and electrical insulation; Electrodes; Moisture; Oil insulation; Performance evaluation; Petroleum; Polymers; Power transformer insulation; Testing; Trees - insulation;
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.1994.401516
