Ground fault distribution on overhead transmission lines

Abstract

When a ground fault occurs on an overhead transmission line in a power network with grounded neutral, the fault current returns to the grounded neutral through the tower structures, ground return paths and ground wires. This paper presents an analytical method in order to evaluate the ground fault current distribution in an effectively grounded power network. The effect of soil resistivity, ground resistance of towers and power line configuration, on the magnitude of return currents, has been examined.

Substation and Transmission Lines Earthing System Design under Substation Fault

“…Hence, the designer usually studies the earth grid of the substation without taking into consideration the impact of the design on the poles located within the finite length. As stated in previous works [21,22], the substation can only see within the finite length of the line. Equation (1) can be used to compute the infinite length of the OHEW;…”

Photovoltaic solar farm; earthing system design for cost reduction and system compliance

“…The combined footings resistance can be computed using (4) along with the maximum length as per (5). These concepts is the same as transmission line input resistance, which is verified in the following references [20][21][22][23][24][25]. These equations aid the designer to complete the assessment using excel or Matlab engineering software.…”

“…As highlighted within the introduction, the current standards and procedures do not reflect the optimum process for large PV farm earthing deign. The paper utilized the available information within the current standards [2][3][4][5][6][7], and the available research outputs [13][14][15][16][17][18][19][20], to determine the optimum steps to ensure the earthing design complies with safety and operation policies. Note that this is done while reducing implementation cost and environmental impact of the project.…”

Impact of energization current on the safe design of distribution substation earth grid

“…In the event of an earth fault occurring on an overhead distribution network with earthed neutral, the fault current returns to the earthed neutral through tower structures and footing, earth return paths and earth wires, thus flowing through multiple parallel paths [6].…”