Title :
The effect of moisture on the breakdown of aged oil in underground load interrupter switches
Author :
Li, C.Y. ; Cheng, T.C. ; Wang, F. ; Worland, E.M.
Author_Institution :
Jiangsu Inst. of Electr. Test & Res., Nanjing, China
Abstract :
Breakdown tests on aged oil from underground load interrupter switches were conducted under various moisture conditions for different gap designs. Water drops, causing large electric field distortions, especially for uniform gap systems, showed the most adverse effect on the breakdown strength of oil. Dissolved water and fine droplets, with minor impact on breakdown strength, can result in dramatic increases in leakage current that may be used to detect the formation of large water drops and potential switch failures.<>
Keywords :
ageing; electric breakdown of liquids; electric strength; insulating oils; materials testing; moisture; oil circuit breakers; adverse effect; aged oil; breakdown strength; electric field distortions; fine droplets; gap designs; leakage current; moisture conditions; potential switch failures; underground load interrupter switches; uniform gap systems; water detection; Aging; Dielectrics and electrical insulation; Electric breakdown; Interrupters; Moisture; Oil insulation; Petroleum; Switches; Testing; Water;
Journal_Title :
Electrical Insulation, IEEE Transactions on
