State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Shapingba District, Chongqing 400044, China
State Grid Chongqing Electric Power Co. Electric Power Research Institute, Yubei District, Chongqing 401121, China
: Received: 12 September 2016 / Approved: 12 September 2016 / Online: 12 September 2016 (10:47:42 CEST)
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Zhang, D.; Zhang, Z.; Jiang, X.; Yang, Z.; Zhao, J.; Li, Y. Study on Insulator Flashover Voltage Gradient Correction Considering Soluble Pollution Constituents. Preprints2016, 2016090042 (doi: 10.20944/preprints201609.0042.v1).
Zhang, D.; Zhang, Z.; Jiang, X.; Yang, Z.; Zhao, J.; Li, Y. Study on Insulator Flashover Voltage Gradient Correction Considering Soluble Pollution Constituents. Preprints 2016, 2016090042 (doi: 10.20944/preprints201609.0042.v1).
Natural polluted insulator surfaces are always coated with various kinds of soluble constituents, and those constituents affect flashover performance differentially. Currently this fact is not considered either in laboratory experiments or field pollution degree measurements, causing the existing insulation selection method to be deficient. In this paper a systematical research on insulator flashover voltage gradient correction involving types of soluble pollution constituents was presented. Taking typical type glass insulator as the sample, its flashover tests polluted by typical soluble chemicals NaCl, NaNO3, KNO3, NH4NO3, MgSO4, Ca(NO3)2 and CaSO4 were carried out. Then the flashover gradient correction was made combining the flashover performance of each soluble constituent, the ESDD contribution of the seven constituents, as well as the saturation performance of CaSO4. The correction was well verified with the flashover test results of insulator polluted by three types of soluble mixture. Research results indicate that the flashover gradient correction method proposed by this paper performs well in reducing the calculating error. It is recommended to carry out component measurements and flashover gradient correction to better select outdoor insulation configuration.
insulator; pollution flashover; equivalent salt deposit density (ESDD); soluble constituent; flashover voltage gradient