The accurate modelling of grounding system is important part of power system transient studies. It is special significance for high frequency phenomena like lightning striking one tower of power transmission lines, when the length of electrodes and soil layers can effect accuracy of grounding system modeling. This paper presents the effects of electrode length and multilayer soil in the ground potential rise using impressed-current model as the excitation. The input impedance for different lengths of vertical electrode in wide-band frequency is obtained by making use of the method of moments solution to Maxwell’s equtions. The subsequent stroke has high frequency contents and the dynamic behavior of grounding system must be taken into account. Therefore, the input impedance is used for ground potential rise calculations. input impedance depends on the parameters of both layers and the length of electrode. Additionally, different soil resistivity, different electrode lengths in uniform and multilayer soil are simulated. The simulation results in this paper show that the geometry and accurate model for grounding system are important in ground potential rise.
|Konference||International Conference on Power Systems Transients, IPST 2019|
|Periode||17/06/2019 → 20/06/2019|
|Navn||International Conference on Power Systems Transients (IPST)|