Publisher : The Korean Institute of Electrical Engineers
DOI : 10.5370/JEET.2016.11.4.961
Title & Authors
Effects of Non-uniform Pollution on the AC Flashover Performance of Suspension Insulators Zhijin, Zhang; Jiayao, Zhao; Donghong, Wei; Xingliang, Jiang;
The non-uniform distribution of contamination on insulator surface has appreciable effects on flashover voltage, and corresponding researches are valuable for the better selection of outdoor insulation. In this paper, two typical types of porcelain and glass insulators which are widely used in ac lines were taken as the research subjects, and their corrections of AC flashover voltage under non-uniform pollution were studied. Besides, their flashover characteristics under different ratio (T/B) of top to bottom surface salt deposit density (SDD) were investigated, including the analysis of flashover voltage, surface pollution layer conductivity and critical leakage current. Test results gave the modified formulas for predicting flashover voltage of the two samples, which can be directly applied in the transmission line design. Also, the analysis delivered that, the basic reason why the flashover voltage increases with the decrease of T/B, is due to the decrease of equivalent surface conductivity of the whole surface and the decrease of critical leakage current. This research will be of certain value in providing references for outdoor insulation selection, as well as in proposing more information for revealing pollution flashover mechanism.
Leclerc M, Bouchard RP, Gervais Y, Mukhedkar D. Wetting processes on a contaminated insulator surface. IEEE Trans. Power Appl Syst 1982; 101: 1005-1011.
Zhang R, Zheng J. Progress in outdoor insulation research in China. IEEE Trans Electr Insul 1990; 25: 1125-1137.
Zhang Z, Jiang X, Cao Y, Sun C, Hu J. Influence of low atmospheric pressure on AC pollution flashover performance of various types insulators. IEEE Trans Dielectr Electr Insul 2010; 17: 425-433.
Naito K, Hasegawa Y, Imakoma T. Improvement of the DC voltage insulation efficiency of suspension insulators under contaminated conditions. IEEE Trans Electr Insul 1988; 23: 1025-1032.
Douar MA, Mekhaldi A, Bouzidi MC. Flashover process and frequency analysis of the leakage current on insulator model under non-uniform pollution conditions. IEEE Trans Dielectr Electr Insul 2010; 17: 1284-1297.
Chakravorti S, Mukherjee PK. Power frequency and impulse field calculation around a HV insulator with uniform or non-uniform surface pollution. IEEE Trans Electr Insul 1993; 28: 43-53.
Koshairy MAE, Rizk FAM. Comportement des Isolateurs des Lignes de Transport de Très Haute Tension Dans les Conditions Désertiques. CIGRE Rapport 33-05, Paris, France, 1970.
Jiang X, Wang S, Zhang Z, Hu J, Hu Q. Investigation of flashover voltage and non-uniform pollution correction coefficient of short samples of composite insulator intended for ±800kV UHVDC. IEEE Trans Dielectr Electr Insul 2010; 17: 71-80.
Ye H, Zhang J, Ji Y, Sun W, Kondo K, Imakoma T. Contamination accumulation and withstand voltage characteristics of various types of insulators. In: IEEE 2003 Properties and Applications of Dielectric Materials (ICPADM) Conference, Nagoya, Japan: IEEE. pp. 1019-1023.
Zhang Z, Liu X, Jiang X, Hu J, Gao DW. Study on AC flashover performance for different types of porcelain and glass insulators with non-uniform pollution. IEEE Trans Power Delivery 2013; 28:1691-1698.
EPRI. HVDC transmission line insulation performance: Report EL24618. EPRI, USA, 1986.
Sima W, Yuan T, Yang Q, Xu K, Sun C. Effect of nonuniform pollution on the withstand characteristics of extra high voltage (EHV) suspension ceramic insulator string. IET Generation, Transmission & Distribution 2010; 4: 445-455.
Zhang Z, Jiang X, Chao Y, Chen L, Sun C, Hu J. Study on DC pollution flashover performance of various types of long string insulators under low atmospheric pressure conditions. IEEE Trans Power Delivery 2010; 25: 2132-2142.
Liu X. Study on the pollution accumulation rule and AC pollution flashover performance of insulators with typical sheds. MSc, Chongqing University, Chongqing, China, 2013.
Jiang X, Yuan J, Zhang Z, Hu J, Shu L. Study on pollution flashover performance of short samples of composite insulators intended for ± 800 kV UHVDC. IEEE Trans Dielectr Electr Insul 2007; 14:1192-1200.
Jiang X, Yuan J, Shu L, Zhang Z, Hu J, Mao F. Comparison of DC pollution flashover performances of various types of porcelain, glass, and composite insulators. IEEE Trans Power Delivery 2008; 23: 1183-1900.
IEC Standard. Artificial pollution tests on high-voltage insulators to be used on dc Systems. IEC Tech Rep 1245, 1993.
CIGRE WG’S-33.04. Artificial pollution testing of HVDC insulators: analysis of factors influencing performance. Electra 1992; 11: 98-113.
IEC Standard. Artificial pollution tests on high-voltage insulators to be used on AC systems. IEC-60507, 2004.
Chinese Standard. Artificial pollution tests on High-Voltage insulators to be used on ac systems solid-layer method, GB/T 4585.2-91, 1991.
Rizk FAM. Mathematical model for pollution flashover. Electra 1981; 78: 101-116.
Rahal AH, Huraux C. Flashover mechanism of HV insulators. IEEE Trans Power App Syst 1979; 98: 2223-2229.