Lightning-Induced Wave Processes in a 10 kV High-Voltage Automatic Block System

this paper investigates wave processes occurring in a 10 kV high-voltage automatic block system exposed to lightning impact. The objective is to research a three-phase overhead transmission line with distributed parameters that powers railway signalling and interlocking systems. The study focuses on the impulse overvoltages and currents in the line caused by lightning discharges. A mathematical model of the overhead line based on multi-conductor telegraph equations and expressed in a state-variable format has been created in order to study these impacts. The model is implemented with spatial discretization along the line via a pi-approximation, providing an explicit three-phase representation that accounts for inter-phase inductive and capacitive couplings. Nonlinear surge limiters, a dynamic depiction of the lightning channel, and a lightning impact source are all included in the model. The model has been numerically implemented in the time domain, using robust methods for integrating differential equations. The model is intended to compute the temporal and spatial distributions of voltages and currents at characteristic points along the line, in addition to analyzing the influence of line parameters and protective device configuration on the generating of wave overvoltages.