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access icon openaccess Study on overvoltage characteristics and arrester configuration strategy for ±1 100 kV HVDC transmission lines

Overvoltage caused by faults or switching is one of the decisive factors affecting the insulation level of equipment in UHVDC transmission systems. As for ±1 100 kV transmission projects, there has been no clear conclusion about the overvoltage distribution characteristics along transmission lines. This paper studies characteristics of the overvoltage distribution along ±1 100 kV transmission lines after building the simulation platform of ±1 100 kV UHVDC transmission systems with the use of PSCAD software. The typical fault conditions are simulated such as monopolar line-to-ground fault and line-broken-down fault of transmission lines. The distribution characteristics of overvoltage along the line under different faults are obtained. The simulation results show that the arresters installed along the lines can significantly reduce the switching voltage level of DC lines. The voltage-current characteristics and the installation density of the arresters along the line have an important influence on the overvoltage suppression effect. Through the comparative analysis, a configuration scheme of arresters along the lines is proposed, which has a great effect for overvoltage suppression. The results are instructive for the design of insulation coordination in practical projects.

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http://iet.metastore.ingenta.com/content/journals/10.1049/joe.2018.8873
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