1 Department of Energy Technology, The Faculty of Engineering and Science, Aalborg University, VBN2 Electric Power Systems, The Faculty of Engineering and Science, Aalborg University, VBN3 The Faculty of Engineering and Science, Aalborg University, VBN4 Doshisha University5 WTW Power Solutions, Warsaw6 Energinet.dk7 Doshisha University
Statistical distributions of switching overvoltages have been used for decades for the determination of insulation levels of extremely high voltage (EHV) systems. Existing statistical distributions obtained in the 1970s are for overhead lines, and statistical distributions of switching overvoltages of EHV cables are not available to date. This paper derives the statistical distribution of energization overvoltages of EHV cables. Through the comparison of the statistical distributions of EHV cables and overhead lines, it has been found that line energization overvoltages on the cables are lower than those on the overhead lines with respect to maximum, 2%, and mean values. As the minimum value is almost at the same level, standard deviations are smaller for the cables. The obtained statistical distributions in this paper are of a great importance in considering insulation levels of cable systems.
I E E E Transactions on Power Delivery, 2013, Vol 28, Issue 3, p. 1423-1432
Energization overvoltage; Extremely high voltage (EHV) cables; Insulation coordination; Statistical switching