Lightning Performance Design Review of 150kV Overhead Transmission Line
DOI:
https://doi.org/10.62146/ijecbe.v3i2.122Keywords:
lightning surges, shielding failure, backflashover, overhead transmission lines, ATP-EMTPAbstract
Lightning overvoltage constitutes the predominant cause of transmission line interruptions in Indonesia, significantly compromising system safety and reliability. This paper presents comprehensive simulations of lightning performance on 150kV overhead transmission lines using ATP-EMTP software, with particular focus on evaluating shielding failure and back flashover occurrences on one of the standard tower designs used by PT PLN (Persero). The transmission line model incorporates shielding wires, phase conductors, tower surge impedance, current-dependent footing resistance behavior, and arcing horns. Simulations were conducted to investigate three key aspects: maximum shielding failure current based on various Electrogeometric Model (EGM) constants, the impact of footing resistance on critical flashover current, and the effect of arcing horn length variations on critical flashover current. The analysis also accounts for phase angle variations in system voltage. Results highlight the significant influence of these variables on the Lightning Flashover Rate (LFR) of existing tower designs. Increasing footing resistance from 10Ω to 20Ω elevates Back Flashover Rate (BFOR) by 16.39%, while further increases to 30Ω and 40Ω yield only marginal increases of 17.33% and 17.76%, respectively. Notably, arcing horn gap length modifications demonstrate substantial performance improvements, with 1.4m and 1.5m gaps reducing LFR by 17.37% and 30.87%, respectively, compared to the 1.3m reference configuration. Analysis of maximum shielding-failure currents across varying EGM coefficient sets indicates that shield wires fail to intercept currents in the range of 2.53 kA to 52.81 kA.
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