Effects of electric field distribution on icing and flashover performance of 220 kV composite insulators

The energized icing of composite insulators has been studied by the researchers around the world, but not much about the effects of electric field distribution on their icing and flashover performance. For this purpose, the ice accretion and flashover performance of 220 kV composite insulators with two shed configurations on occasions of different electric field distributions considering the effect of grading rings are analyzed in this paper. The test results indicate that the intensity and homogeneous distribution of electric field have positive effects on the appearance, density and weight of ice; the improvement of electric field distribution after installing grading ring has more effects than the icing characteristics, such as quality, density as well as appearance of ice, on flashover voltages of ice-covered composite insulators; the icing flashover voltages are increased by the improvement of electric field distribution and the increasing ranges of icing flashover voltage were relied on shed configuration. Icing accumulation patterns have less effect on flashover performance of composite insulators with alternatediameter or widely spaced shed configurations.

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

[2]  Katsuhiko Naito,et al.  Performance of Insulators Covered With Snow or Ice , 1979, IEEE Transactions on Power Apparatus and Systems.

[3]  Liang Yu.  Study on Icing Performance of 110kV Insulator Strings at AC Service Voltage , 2006 .

[4]  Luo Bing.  Optimization of Corona Ring Design for ±800 kV UHV DC Transmission Lines , 2007 .

[5]  C. Volat,et al.  Influence of a grading ring on AC flashover voltage of an EHV post insulator covered with ice , 2009, 2009 IEEE Conference on Electrical Insulation and Dielectric Phenomena.

[6]  W. Chisholm.  Insulator Leakage Distance Dimensioning in Areas of Winter Contamination using Cold-fog Test Results , 2007, IEEE Transactions on Dielectrics and Electrical Insulation.

[7]  Zhou Wenjun.  Investigation of Ice-Covered Transmission Lines and Analysis on Transmission Line Failures Caused by Ice-Coating in China , 2008 .

[8]  Zou Yunping.  Research on Improving the Voltage Distribution of the Insulator String by Voltage Balance Slices , 2006 .

[9]  M. Farzaneh,et al.  Three-dimensional modeling of potential and electric-field distributions along an EHV ceramic post insulator covered with ice - Part I: Simulations of a melting period , 2005, IEEE Transactions on Power Delivery.

[10]  J. Hanssen,et al.  Long range transported pollutants and conductivity of atmospheric ice on insulators , 1993 .

[11]  M. Farzaneh,et al.  Insulators for Icing and Polluted Environments , 2009 .

[12]  Sun Cai-xin.  Influence of Icing Degree on DC Icing Flashover Performance of Composite Insulator , 2009 .

[13]  Yan Wang,et al.  Study on AC Flashover Performance and Discharge Process of Polluted and Iced IEC Standard Suspension Insulator String , 2007, IEEE Transactions on Power Delivery.

[14]  Xingliang Jiang,et al.  Chinese Transmission Lines’ Icing Characteristics And Analysis of Severe Ice Accidents , 2004 .

[15]  Sheng Dao-wei.  Influence of AC Electric Field on Ice-Coating Process of Composite Insulators , 2009 .

[16]  L. Phan,et al.  Minimum Flashover Voltage of Iced Insulators , 1983, IEEE Transactions on Electrical Insulation.

[17]  C. Volat,et al.  Electric field modelling around an ice-covered insulator using boundary element method , 2000, Conference Record of the 2000 IEEE International Symposium on Electrical Insulation (Cat. No.00CH37075).

[18]  Wang Zhongyi.  Analysis of the Electric Field of 330 kV Composite Insulator with Grading Rings , 2004 .

[19]  M. Farzaneh,et al.  Improving electrical performance of ehv post station insulators under severe icing conditions using modified grading rings , 2013, IEEE Transactions on Dielectrics and Electrical Insulation.

[20]  Jianlin Hu,et al.  Study of DC flashover performance of ice-covered insulators at high altitude , 2013, IEEE Transactions on Dielectrics and Electrical Insulation.

[21]  Shu Li-chun.  Impact Mechanism of AC Electric Field on Formation of Icing on Insulators , 2008 .

[22]  Caixin Sun,et al.  Flashover Performance of Pre-contaminated and Ice-covered Composite Insulators to be Used in 1000 kV UHV AC Transmission Lines , 2007, IEEE Transactions on Dielectrics and Electrical Insulation.

[23]  Li Ri-long.  Study on Application of Grading Ring for Composite Insulator , 2004 .

[24]  P. Cochat,et al.  Et al , 2008, Archives de pediatrie : organe officiel de la Societe francaise de pediatrie.

[25]  S. Ingebrigtsen,et al.  Forces acting on water droplets falling in oil under the influence of an electric field: numerical predictions versus experimental observations , 2005 .

[26]  Sima Wen-xia.  OPTIMIZATION OF CORONA RING DESIGN FOR EHV COMPOSITE INSULATOR USING FINITE ELEMENT AND NEURAL NETWORK METHOD , 2005 .

[27]  Xingliang Jiang,et al.  Equivalence of Influence of Pollution Simulating Methods on DC Flashover Stress of Ice-Covered Insulators , 2010, IEEE Transactions on Power Delivery.

[28]  Li Jin,et al.  A displaced dipole model for spheres in a non-uniform field , 2002 .