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In this work, the transient over – voltage 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 MATLAB program. Then, the transient voltage occurred at the underground cables is analyzed by using modified Fourier transform. The studied systems of underground cables are firstly modeled in frequency domain. Transient voltages induced at the sending-end and receiving-end terminals of an underground cable of transmission system are calculated in frequency domain and using inverse Fourier Transform, the sending end and receiving end voltages are obtained by converting to time domain. The effects of cable length and source impedance on transient over – voltage phenomena at underground cables are investigated. Also, the effects of GIBBS factor in transients are researched in order to eliminate GIBBS oscillations. Numerical simulations are presented to demonstrate the transient voltages induced at the terminals of sending-end and receiving-end of an underground cable at transmission system and the effects of GIBBS factor.

The Effect of GIBBS Factor on Transient Analysis in Underground Power Cables