Surge Voltage Distribution Test for the Insulation Design at Kihoku Converter Station

Abstract

We compared the test results with the analyzed one, and confirmed the accordance of both results. In case of direct striking to the DC high voltage line , the peak voltage at the line entrance was 628.8kV. The overvoltage was reduced to around 500kV by the lightning arrester in the wave tail. In case of back flash over to the DC neutral line , the peak voltage at the line entrance was 507.8 [kV], The overvoltage 942 T.

Influence of Modeling Methods on the Calculated Lightning Surge Overvoltages at a UHVDC Converter Station Due to Backflashover

“…The influence of the lightning surge overvoltage on the LIWV of the equipment in a UHVDC converter station is smaller than that in the lower voltage-level power system. Some studies about the lightning surge overvoltages in a substation or converter station have been carried out [3]- [6]. However, there are still some problems in the modeling methods of the lightning surge overvoltage in a UHVDC power transmission system, such as the tower model, flashover criterion of the insulator, waveform of the lightning Manuscript stroke current, dc filters, electromagnetic transient models of the equipment in the converter station, etc.…”