An Improved Statistical Method for Calculating Lightning Overvoltages in HVDC Overhead Line/Cable Systems

Oscar Lennerhag, Jan Lundquist, Christiaan Engelbrecht, Tanumay Karmokar and Math H. J. Bollen
Additional contact information
Oscar Lennerhag: Independent Insulation Group Sweden AB, 771 30 Ludvika, Sweden
Jan Lundquist: Independent Insulation Group Sweden AB, 771 30 Ludvika, Sweden
Christiaan Engelbrecht: Engelbrecht Consulting B.V., 6715 KD Ede, The Netherlands
Tanumay Karmokar: NKT HV Cables AB, 371 60 Lyckeby, Sweden
Math H. J. Bollen: Engineering Sciences and Mathematics, Luleå University of Technology, 931 87 Skellefteå, Sweden

Energies, 2019, vol. 12, issue 16, 1-17

Abstract: HVDC cable systems connected to HVDC overhead lines are subject to fast front overvoltages emanating from the line when lightning strikes a shield wire (backflashover) or a pole conductor (shielding failure). Representative fast front overvoltage levels for HVDC cable systems are usually established without considering their statistical characteristics. A statistical method to determine overvoltages related to the acceptable mean time between failure (MTBF) for the cable system was developed previously. The method accounts for the statistical distribution of lightning current magnitudes as well as the attenuation of the overvoltage wave due to corona discharges on the line, since this effect dominates for system voltages up to about ±320 kV. To make the method suitable for higher system voltages as well, this article introduces an improved statistical method which also accounts for surge attenuation through resistive effects, soil ionization, and statistical treatment of overvoltages due to shielding failures. To illustrate the improved method, it is applied to a case study for a ±525 kV DC line.

Keywords: HVDC; cable; overhead line; lightning; overvoltage; MTBF (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 complete reference list from CitEc
Citations: View citations in EconPapers (4)

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