Abstract
Positive switching impulse discharge characteristics are an important basis for the external insulation design of transmission line towers. At present, the characteristics are obtained mainly by real tower discharge tests. Since the existing research on the discharge model is not perfect, test designs are not reasonable, which results in high costs. The influence of line height and tower width on the discharge characteristics of Ultra High Voltage (UHV) transmission lines air gaps is studied in this paper. The results show that the line height had little influence on the breakdown voltage of air gaps in UHV transmission lines. A tower-width discharge model was obtained by fitting the breakdown voltage of air gaps with different gap lengths and tower widths. By analyzing the gap characteristic factors of different transmission lines, a discharge model of different tower air gaps in UHV transmission lines was presented. The breakdown voltage calculated by the models was in good agreement with the test results, and the errors were not more than 5%.
Highlights
In order to solve the problem of reverse distribution of energy resources and load centers, China has carried out a great deal of research and construction work on Ultra High Voltage (UHV)
The positive switching impulse discharge characteristics are an important basis for the external insulation design of transmission line towers
A tower-width discharge model was presented by fitting the breakdown voltage of air gaps with different gap lengths and tower widths
Summary
In order to solve the problem of reverse distribution of energy resources and load centers, China has carried out a great deal of research and construction work on Ultra High Voltage (UHV). The positive switching impulse discharge characteristics are an important basis for the external insulation design of transmission line towers. The discharge characteristics of long air gaps are complex and have been the focus of research in high voltage transmission projects for many years. In the 1960s, some scholars studied the discharge characteristics under switching impulse, obtained the breakdown characteristics of different gap structures through a large number of tests, and established several empirical formulas for calculating the discharge voltage [3,4,5]. At scholars adopt real tower tests to obtain the positive switching switching impulse discharge characteristics of air gaps in UHV transmission lines. Since the research discharge characteristics of air gaps in UHV transmission lines.
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