Akademik Veri Yönetim Sistemi
2025 26th International Middle East Power Systems Conference (MEPCON), Aswan, Mısır, 20 - 22 Aralık 2025, (Tam Metin Bildiri)
In a 36 kV medium-voltage modular switchgear system equipped with a vacuum circuit breaker rated for a short-circuit withstand current of 25 kA, elevated electric field concentrations have been observed at the junction between the earthing switch and the bottom cable termination. Initial simulations have revealed peak electric field values reaching up to 145 kV/cm, significantly exceeding the acceptable design threshold at nominal values, thereby compromising the dielectric integrity of the system. To address this issue, the geometry of the copper busbar has been modified by introducing chamfers to eliminate sharp edges. These adjustments have led to partial improvements, reducing the peak electric field values at critical locations. However, these values have remained above the target threshold, necessitating the integration of a field regulator. A series of field regulator geometries has been designed and evaluated using finite element method (FEM) simulations. The most effective configuration, which features a field regulator measuring 1.2 mm in length per unit and 1 mm in width per unit, showed an average reduction of approximately 31% in electric field intensity at critical points compared to the original baseline design, owing to iterative optimization. The findings indicate that the insulation coordination standards are met, and the dielectric performance of the system is also improved.