Effect of Externally Gapped Line Arrester Placement on Insulation Coordination of a Twin-Circuit 220 kV Line

Enhancing the lightning performance of overhead transmission lines with optimal EGLA and downstream shield wire placement in mountainous areas: a complete study

“…Although they have considered the different tower footing resistance, EGLA in TL has not been employed. As explained in [2,14], the minimum lightning current causing back-flashover is low and it has improved in this paper. The authors of [2,8,12] that explained the EGLA advantages, but these papers have not investigated which type of EGLA is more suitable for selection.…”

“…Moreover, there are several electrical factors that may worsen or lessen the undesired impacts of lightning. Nominal voltage, tower configuration, tower footing resistance, the number and arrangement of circuits, ground flash density, the wave shape of the lightning, and the corona effect are these factors [1,2]. So far, extensive studies have been carried out to cope with the adverse impact of lightning on TLs and consequently, high-voltage substation [3,4].…”

“…Equipping the TL with EGLAs can change the impedance on the transient wave travelling in overhead lines. Authors in [2] have studied the EGLA placement in double circuit 220 kV TL but it has not specified EGLA type and DSW in the presence lightning strike. By increasing the EGLA number in a TL, the EGLA discharge current should be decreased.…”

“…By increasing the EGLA number in a TL, the EGLA discharge current should be decreased. However, in [2], by increasing the EGLA number in TL, the EGLA discharge current has a different procedure. The authors in [14] have utilised a 115 kV overhead line using various possible surge arrester arrangements.…”

Optimal Surge Arrester Placement for Extra High Voltage Substation

“…The risk of lightning outages of transmission lines was introduced by Armstrong and whitehead [3]. Shield wires, in combination low footing resistance, improve the lightning performance of a transmission line, and the application of line arresters provides an additional increment of protection [4]. In India, the number of lightning strokes that hits the ground is between 4 strokes per square kilometer per year [10].…”