Assessment of Overvoltage and Insulation Coordination in Mixed HVDC Transmission Lines Exposed to Lightning Strikes

Mansoor Asif, Ho-Yun Lee, Kyu-Hoon Park, Ayesha Shakeel and Bang-Wook Lee
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Mansoor Asif: Department of Electronic Engineering, Hanyang University, Hanyangdaehak-ro 55, Ansan 15588, Korea
Ho-Yun Lee: Department of Electronic Engineering, Hanyang University, Hanyangdaehak-ro 55, Ansan 15588, Korea
Kyu-Hoon Park: Department of Electronic Engineering, Hanyang University, Hanyangdaehak-ro 55, Ansan 15588, Korea
Ayesha Shakeel: Department of Electronic Engineering, Hanyang University, Hanyangdaehak-ro 55, Ansan 15588, Korea
Bang-Wook Lee: Department of Electronic Engineering, Hanyang University, Hanyangdaehak-ro 55, Ansan 15588, Korea

Energies, 2019, vol. 12, issue 21, 1-24

Abstract: Many geographical constraints and aesthetic concerns necessitate the partial use of cable sections in the High Voltage DC (HVDC) transmission line, resulting in a mixed transmission line. The overhead sections of mixed lines are exposed to lightning strikes. The lightning strikes can not only result in flashover of overhead line (OHL) insulators but can enter the cable and permanently damage its insulation if adequate insulation coordination measures are not taken. In this work, we have analyzed the factors that affect the level of overvoltage inside the cable by simulating a fast front model in PSCAD. It has been determined that surge arresters must be provided at cable terminals when the length of cable sections is less than 16 km to limit the core-ground overvoltage within the lightning impulse protective level (LIPL). The level of sheath-ground overvoltage is independent of the length of cable; however, it can be limited within LIPL by lowering the sheath grounding impedance to 1.2 ?. Insulation coordination measures do not impact the likelihood of OHL insulators’ flashover. The flashover performance of OHL can be improved by lowering the footing impedance of the second tower closest to the cable terminals, which is otherwise most likely to flashover.

Keywords: cable overvoltage; DC transmission; dielectric breakdown; electromagnetic transient simulation; high voltage; insulation coordination; negative lightning strikes (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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