Influence of Highly Resistive Ground Parameters on Lightning-Induced Overvoltages Using 3-D FDTD Method

PROJECT TITLE:

Influence of Highly Resistive Ground Parameters on Lightning-Induced Overvoltages Using 3-D FDTD Method

ABSTRACT:

It is vital for the proper insulation style of the distribution system that lightning-induced overvoltages ( LIOVs) are accurately computed. This paper investigates the impact of ground resistivity, considering wide selection up to 20 kΩm, on LIOVs impinging an overhead line thanks to nearby come back stroke using the 3-dimensional finite distinction time domain (3-D FDTD) technique. The investigation considers two values of both ground permittivity in addition to the rise rate of lightning current. Subsequently, it is inferred that the influence of each ground permittivity and rise rate of lightning current on the height values of LIOVs depends on the ground resistivity. Furthermore, horizontal conduction and displacement current densities are also calculated on the bottom surface under the road to research the behavior of ground surface impedance. Consequently, it’s deduced that the behavior of the impedance changes from inductive to capacitive at high values of ground resistivity, thus increasing the time to the height value of LIOVs. The peak values of LIOVs computed using the three-D FDTD methodology are compared with those calculated using Darveniza’s formula. It has been revealed that this formula significantly underestimates the height values of LIOVs at high values of ground resistivity. Thereby, an interpretation is presented for the explanation of this underestimation from an electromagnetic perspective. Accordingly, Darveniza’s formula is appropriately modified to improve the computation accuracy.

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