Title :
Thermal aging of silicone oil aromatic polyamide insulation systems
Author :
Abe, K. ; Hamaguchi, M. ; Umemura, T. ; Umeda, M.
Author_Institution :
Heavy Apparatus Eng., Toshiba Corp., Mie, Japan
fDate :
8/1/1998 12:00:00 AM
Abstract :
The thermal degradation behavior of silicone oil/aromatic polyamide insulation system was studied. It was found that the flash and fire points decreased due to the formation of low molecular weight by-products of such cyclic siloxane oligomers as D3, D4 and D5. The gel permeation chromatography (GPC) and high performance liquid chromatography (HPLC) analysis clarified that the depolymerization of siloxane molecules happened during the thermal aging, resulting in the high- and low- molecular by-products formation. The thermal stability index (TGI) index obtained by the thermogravity (TG) measurements and cyclic oligomer detection could be used for the insulation diagnosis
Keywords :
ageing; chromatography; insulating oils; insulation testing; silicone insulation; thermal analysis; thermal stability; cyclic oligomer detection; cyclic siloxane oligomers; depolymerization; fire points; flash points; gel permeation chromatography; insulation diagnosis; liquid chromatography; low molecular weight by-products; silicone oil aromatic polyamide; thermal aging; thermal degradation behavior; thermal stability index; thermogravity; Aging; Bonding; Detectors; Fires; Oil insulation; Petroleum; Temperature; Thermal degradation; Thermal stability; Transformers;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
