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| Influence of T-Type Arrangement on Icing Process and AC Flashover Performance of Insulator Strings |
| Jiang Xingliang, Bi Conglai, Wang Han, Yang Zhongyi, Han Xingbo |
| State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China |
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Abstract The drop of insulation performance of insulator under icing weather is one of the important causes of grid accident. Although domestic and foreign scientists have carried out many researches on icing insulators, the study on insulator string arrangement is relatively lacking. This paper presents the inverted T-type arrangement based on the practical problems in the construction and reconstruction of transmission lines. During the test, the insulators were polluted by solid layer method. Natural icing environment were simulated in the artificial climate chamber. Regarding single string and inverted T-type arrangement string with the same leakage distance, AC flashover test considering the variation of equivalent salt deposit density (ESDD) and icing degree were carried out. The tests and analysis indicate that insulators are not bridged by icicles in the horizontal section of the inverted T-type arrangement string, while the ice flashover voltage (Umf) between the ESDD and ice thickness of the inverted T-type insulator string satisfy negative power function, which is less affected by the ESSD and icing degree. There are also differences in arc starting position and development path in the flashover process under the two arrangements. Compared with single string, also the critical leakage current of the inverted T-type arrangement string has descent about 9.71% and the ice flashover voltage of it has improved about 6.21%~9.69%.
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Received: 29 June 2018
Published: 20 September 2019
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2019, Vol. 34 
