摘要：In this work, the transient overvoltage phenomena occurred at 34.5 kV AC underground cable transmission systems during the closure of the underground cables is to be studied and simulated by using the MATLAB program. Then, the transient voltage occurred at the underground cables is analyzed by using a modified Fourier transform. The studied system of underground cables is firstly modeled in the frequency domain. Transient voltages induced at the sending-end and receiving-end terminals of an underground cable of the transmission system are calculated in the frequency domain and using inverse Fourier Transform, the sending end and receiving end voltages are obtained by converting to the time domain. The effects of Gibbs factor on transients overvoltage phenomena considering cable length and source impedance are investigated. Numerical simulations are presented to demonstrate the transient voltages induced at the terminals of sending-end and receiving-end of an underground cable at the transmission system and the effects of Gibbs factor to eliminate Gibbs oscilllations.
