Title :
Ageing characteristics of synthetic liquids
Author :
Thomas, P. ; Sridhar, S.
Author_Institution :
Central Res. & Testing Lab., Central Power Res. Inst., Bangalore, India
Abstract :
Synthetic liquids have been developed as substitutes for the PCB´s in electrical applications in transformers, capacitors and switchgear equipment. These liquids are tailor made to meet the requirement of specific applications. Pentaerthritol esters of oleic acid and caprylic acid, methyl oleate, silicone oil, iso propyl biphenyl, alkyl benzene and liquids derived from vegetable oil were studied for electric strength, tan delta and resistivity before being subjected to accelerated ageing. These liquids were subjected to accelerating ageing as per the procedure outlined in ASTM D1934. The deterioration of the electrical properties due to the oxidation products like acids and sludge formation are evaluated and discussed
Keywords :
ageing; dielectric liquids; dielectric losses; electric strength; organic insulating materials; power transformer insulation; switchgear insulation; ASTM D1934; accelerated ageing; ageing characteristics; alkyl benzene; capacitors; electric strength; iso propyl biphenyl; methyl oleate; oxidation products; pentaerthritol esters; resistivity; silicone oil; sludge formation; switchgear; synthetic liquids; tan delta; transformers; vegetable oil; Accelerated aging; Capacitors; Conductivity; Dielectric liquids; Dielectrics and electrical insulation; Manufacturing; Minerals; Petroleum; Testing; Transformers;
Conference_Titel :
Electrical Insulation, 1998. Conference Record of the 1998 IEEE International Symposium on
Conference_Location :
Arlington, VA
Print_ISBN :
0-7803-4927-X
DOI :
10.1109/ELINSL.1998.694857
