Analysis and Mitigation of Switching Transient Overvoltages Caused by Transmission-Line and Power-Transformer Switching in High-Voltage Substations Using Controlled Switching: A Simulation-Based Study
Keywords:
Controlled switching, switching overvoltage, transmission-line energization, transformer inrush current, residual flux, trapped charge, pre-strike, electromagnetic-transient simulation, Monte-Carlo simulation.Abstract
Switching of transmission lines and power transformers can produce severe overvoltages,transformer inrush currents, bus-voltage disturbances, and increased surge-arrester duty in highvoltage substations. This paper develops an integrated electromagnetic-transient framework foranalyzing these phenomena and formulating a coordinated controlled-switching strategy. Theinvestigated 400-kV benchmark includes a frequency-dependent 250-km transmission line, shunt compensation
References
[1] International Electrotechnical Commission, IEC 60071-1:2019, Insulation Co-ordination—Part 1: Definitions, Principles and Rules, 9th ed. Geneva, Switzerland: IEC, 2019.
[2] International Electrotechnical Commission, IEC 60071-2:2023, Insulation Co-ordination—Part 2: Application Guidelines. Geneva, Switzerland: IEC, 2023.
