Temporal and Frequency Analysis of the Leakage Current of a Station Post Insulator during Ice Accretion

This research is concerned with the analysis of leakage current, LC, of a porcelain standard station insulator during a glaze ice accretion. The results obtained show that the leakage current during ice accumulation goes through two distinct periods characterized by specific LC waveforms and frequency harmonics. Laboratory tests demonstrated that the duration of the first period is directly dependent on the icing rate. Hence, measuring the duration of the first period is equivalent to measuring the icing rate. However, this requires the determination of either the transition between the two periods or the detection of the onset of the ice accumulation. The results show that icing rate measurement can be achieved by using results of leakage current analysis, like the time evolution of the third and fifth harmonic, as well as the phase angle difference between leakage current and applied voltage. This analysis makes it possible to characterize the severity of an ice accumulation on a porcelain station insulator.

[1]  M. Farzaneh,et al.  Characterization of leakage current of a post station insulator covered with ice with various surface conductivities , 2005, CEIDP '05. 2005 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2005..

[2]  N. Yoshimura,et al.  Leakage current characterization for estimating the conditions of ceramic and polymeric insulating surfaces , 2004, IEEE Transactions on Dielectrics and Electrical Insulation.

[3]  F. Amarh.  Electric transmission line flashover prediction system , 2001 .

[4]  T. Sakoda,et al.  Evaluation of insulation performance of polymeric surface using a novel separation technique of leakage current , 2003 .

[5]  L. Rolfseng,et al.  Insulator Icing Test Methods and Procedure , 2002, IEEE Power Engineering Review.

[6]  L. Rolfseng,et al.  Insulator icing test methods and procedures: a position paper prepared by the IEEE task force on insulator icing test methods , 2003 .

[7]  I. Ramirez,et al.  Correlation among ESDD, NSDD and leakage current in distribution insulators , 2004 .

[8]  M. A. R. M. Fernando.  Performance of Non-ceramic Insulators in Tropical Environments , 1999 .

[9]  T. Suda.  Frequency characteristics of leakage current waveforms of an artificially polluted suspension insulator , 2001 .

[10]  Gill G. Richards,et al.  Use of pollution monitors with a neural network to predict insulator flashover , 1997 .

[11]  Ramanujam Sarathi,et al.  Diagnostic study of the surface condition of the insulation structure using wavelet transform and neural networks , 2004 .

[12]  Robert Lanoie,et al.  Using Steam to De-Ice Energized Substation Disconnect Switch , 2005 .

[13]  M. Hara,et al.  A study of the leakage current of H.V. insulators under glaze and rime , 1978, Canadian Electrical Engineering Journal.

[14]  Masanori Hara,et al.  Leakage Current and Flashover Performance of Iced Insulators , 1979, IEEE Transactions on Power Apparatus and Systems.

[15]  E Thalassinakis,et al.  Measurements and interpretations concerning leakage currents on polluted high voltage insulators , 2003 .

[16]  M. Farzaneh,et al.  Analysis of Leakage Current of an Ice-Covered Insulator during Ice Accretion , 2006, 2005/2006 IEEE/PES Transmission and Distribution Conference and Exhibition.

[17]  C. Volat,et al.  Temporal and Frequency Study of the Evolution of the Waveform of the Leakage Current of the Ice-Covered Insulators , 2005 .