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Energies 2016, 9(11), 954; doi:10.3390/en9110954

Study on Insulator Flashover Voltage Gradient Correction Considering Soluble Pollution Constituents

1
State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Shapingba District, Chongqing 400044, China
2
State Grid Chongqing Electric Power Co. Electric Power Research Institute, Yubei District, Chongqing 401121, China
*
Author to whom correspondence should be addressed.
Academic Editor: Issouf Fofana
Received: 11 September 2016 / Revised: 24 October 2016 / Accepted: 8 November 2016 / Published: 15 November 2016
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Abstract

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 systematic study on insulator flashover voltage gradient correction involving different types of soluble pollution constituents is presented. Using a 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 by combining the flashover performance of each soluble constituent, the equivalent salt deposit density (ESDD) contribution of the seven constituents, and the saturation performance of CaSO4. The correction agreed with the flashover test results of insulator polluted by three types of soluble mixture. Research results indicate that the flashover gradient correction method proposed in 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. View Full-Text
Keywords: insulator; pollution flashover; equivalent salt deposit density (ESDD); soluble constituent; flashover voltage gradient insulator; pollution flashover; equivalent salt deposit density (ESDD); soluble constituent; flashover voltage gradient
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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. Energies 2016, 9, 954.

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