Abstract
Based on Java-Bali grid disturbance data, the 66kV transmission lines that is close to or intersect with 150kV or 500kV transmission line is often experienced earth fault due to insulator flashover. The insulator flashover can be caused by indirect lightning strike since lightning strikes tend to strike higher structure. Therefore, this paper will determine the effect of indirect lightning strike on 150kV or 500kV transmission line to 66kV transmission line by modeling and simulation using application of transient analysis. Variation of lightning peak current magnitude and gap between 66kV transmission line and transmission line with higher voltage is performed during simulation. The range of peak current magnitude follows the data from lightning detection systems, while the value of gap follows the data from actual condition. It is found that higher current peak and closer gap will cause higher transient overvoltage on insulator of 66kV transmission line thus insulator flashover may occur more frequent. Addition of earth wire on 66kV transmission line and gap between each transmission by organizing the sag of conductor can be performed to minimize the insulator flashover.
Highlights
In Indonesia power system, especially Java-Bali grid, use 66kV, 150kV, and 500kV as the voltage level for transmission line
If the simulation results of scenario 3 are compared to the cumulative occurrence of lightning in Figure 4, it can be seen that the utilization of insulator with basic insulation level (BIL) 325kV for 66kV transmission line, which intersected with 150kV transmission line, will reduce the probability of insulator flashover up to 50%
While the probability of insulator flashover will be lower than 50% for the other cases such as 66kV transmission line which is close to 150kV or 500kV transmission line and 66kV transmission line which is intersected with 500kV transmission line
Summary
In Indonesia power system, especially Java-Bali grid, use 66kV, 150kV, and 500kV as the voltage level for transmission line. Because lightning strike tend to strike higher structure [1,2], so the insulator flashover on this 66kV transmission line can be caused by induced voltage due to lightning strike to 150kV or 500kV transmission line. This phenomenon can be called as indirect lightning strike. Direct lightning strike will cause higher voltage magnitude than induced voltage caused by indirect lightning strike This induced voltage might be occurred more frequently so it can cause disturbance on the transmission line. It is expected to obtain the method that can be used to minimize the occurrence of insulator flashover due to indirect lightning strike
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