Computation Of Maximum Earth Current In Substation Switchyards

Meliopoulos, A. P. Sakis; Webb, R.P.; Joy, Edward Bennett; Patel, S.

doi:10.1109/tpas.1983.318120

Cited by 30 publications

(2 citation statements)

References 7 publications

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“…In the past three decades, a number of researchers have investigated several approaches to determine the earth fault current division and distribution which have been reported [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. A number of methods have made some different approximations and simplifications for evaluation of this issue such as considering identical spans of incoming/outgoing overhead lines, uniform tower footing resistances, an overhead ground wire connected to the earth at various towers through the tower footing resistance which is substituted by an infinite ladder network and etc.…”

Section: Introductionmentioning

confidence: 99%

“…[2-7] and [12] while the other approaches have been reported as analytical methods [1] and [8][9][10][11][12][13][14][15][16][17][18]. In addition, the problem of earth fault current division factor was discussed in [19][20][21][22] which does not provide an approach for this issue with considering the different length of spans, nonuniform tower footing resistance and adjacent the substation grounding system.…”

Section: Introductionmentioning

confidence: 99%

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A Simplified Approach to Calculate the Earth Fault Current Division Factor Passing Through the Substation Grounding System

Saeednia

Ramezani

2022

Scientia Iranica

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The main aim of designing a safe grounding system is to provide a low impedance path to the flow of the earth fault currents without exceeding the operational constraints and equipment limits that will ensure electrical continuity. One of the most significant and well-known parameters to design a safe grounding system in power systems is the exact determination of the maximum earth fault current division factor. This paper presents a simplified and accurate method to calculate the earth fault current division factor in different states of the earth fault occurrence within and the vicinity of the substation under study. In the proposed method, a hybrid overhead-cable line, the impact of the frozen soil, mutual coupling between phase conductors and guard wires, grounding system resistance of adjacent substations, different tower footing resistances, the impact of the phase conductor impedance, and different spans in transmission lines can be considered. In addition, a closed-form formulation is also developed for the occurrence of the earth fault on the transmission line. Finally, details of the analysis results of this study have been compared with other methods in the literature. The validity and accuracy of the proposed approach also have been assayed and confirmed in details.

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