Improving tower grounding vs. insulation level to obtain the desired back-flashover rate for HV transmission lines

Insulation Coordination System 150kV Substation and Transmission Line against Lightning Surge Interference in a Nickel Smelting Plant

“…This value comes from the voltmeter reading on the ATP draw modeling which is installed near the insulator of each phase. From the graph in figure 10, it is obtained: near tower 1 phase A :319 kV, phase B=308 kV and phase C 287 kV Figure 9 shows the increase in voltage on the phase A tower arm of 833 kV due to lightning strike 100 kA on the GSW without any additional protection on the tower, and the voltage value on the phase A will cause a back flashover [19], [20]. The voltage value measured on the phase A exceeds the BIL of the 9 insulator pieces is BIL 730 kV that installed on the transmission tower so that it can cause short circuit disturbances in the electrical system.…”

“…The voltage value measured on the phase A exceeds the BIL of the 9 insulator pieces is BIL 730 kV that installed on the transmission tower so that it can cause short circuit disturbances in the electrical system. Meanwhile, figure 12 shows the voltage drop on tower 1 is 85% with value 129 kV phase A by installing TLA on tower 1 and substation, so that it does not cause back flashover in the electrical system [19], [20].…”

Modeling of different tower grounding systems using hybrid continuous circuit-trapezoidal integration method

“…On the other hand, these methods are not suitable for practical applications as they are complicated and time-demanding [15  17]. HCCTIM is the most recent method in analyzing the grounding system, which adopts the continues circuit method and the trapezoidal integration method [18,19]. Electrical parameters are calculated by integration rules.…”