<![CDATA[This paper presents a mesh-free computational framework for assessing power-frequency electric and magnetic fields generated by 500-kV, 50-Hz overhead transmission lines in Indonesia. The framework integrates the Charge Simulation Method (CSM) for electric-field calculation and the Biot-Savart (BS) formulation for magnetic-field prediction within a GNU Octave environment. The proposed approach was validated against field measurements and benchmarked against Finite Element Method Magnetics (FEMM) using root mean square error (RMSE), mean absolute error (MAE), and mean absolute percentage error (MAPE). Validation results demonstrated good agreement with measurements, achieving MAPE values of 3.00% and 7.24% for electric-field and magnetic-field predictions, respectively, outperforming FEMM in both cases. Computational benchmarking revealed substantial efficiency improvements, with execution-time reductions of approximately 29-31 times for electric-field calculations and 83-86 times for magnetic-field calculations relative to FEMM. The validated framework was subsequently applied to evaluate three 500-kV double-circuit transmission-line configurations commonly used in Indonesia, namely the super-bundle, low-reactance, and double-delta arrangements. Although all configurations satisfied the exposure limits specified by SNI 04-6950-2003, WHO, and ICNIRP guidelines, significant differences were observed in their electromagnetic-field performance. The double-delta configuration consistently produced the lowest electric-field and magnetic-field levels, reducing peak field exposure by up to 61% and 72%, respectively, compared with the super-bundle arrangement. The proposed CSM-BS framework provides an accurate and computationally efficient tool for transmission-line electromagnetic-field assessment, conductor arrangement assessment, and compliance verification.]]>
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