Title :
A study on the profile of HVDC insulators-mathematical modeling and design considerations
Author :
Cheng, T.C. ; Nour, H.I.M.
Author_Institution :
Dept. of Electr. Eng., Univ. of Southern California, Los Angeles, CA, USA
fDate :
2/1/1989 12:00:00 AM
Abstract :
The effects of underrib configuration on the flashover voltage of contaminated HVDC (high-voltage direct-current) insulators are analyzed. Mathematical models are developed to characterize the behavior of multiple discharges sustained along a contaminated surface. The effectiveness of the insulator leakage length is investigated by predicting the discharge path between neighboring underrib tips. An empirical equation is developed to estimate the effectiveness of the creepage length of a profile segment in terms of its physical dimensions. It is confirmed that the effective leakage length as a direct influence on the critical flashover voltage. A method for application of the effectiveness of the insulator leakage length for profile design considerations has been developed. The method yields the optimum number of underribs required for a given insulating space
Keywords :
DC power transmission; flashover; high-voltage techniques; insulators; leakage currents; HVDC insulators; contaminated surface; creepage length; critical flashover voltage; design; discharge path; effectiveness; leakage length; mathematical modeling; multiple discharges; profile; underrib configuration; Dielectrics and electrical insulation; Equations; Flashover; HVDC transmission; Helium; Mathematical model; Shape; Surface contamination; Surface discharges; Voltage;
Journal_Title :
Electrical Insulation, IEEE Transactions on
