Design of UHF Sensor for Partial Discharge Detection

Despite extensive research and practical applications in fault prevention diagnostics for power facilities, issues arising from environmental factors and subjective judgment errors persist. Particularly, the diagnosis of distribution-level facilities employs multiple methods, revealing limitations in terms of cost-effectiveness and reliability. Power facilities, operating under high-voltage and high-current conditions, are prone to degradation. To address these challenges, this study proposes a diagnostic sensor that measures electromagnetic waves emitted during partial discharge (PD). This paper presents the design of a high-sensitivity, reliable sensor. to minimize environmental influences and accurately detect PD signals for early diagnosis of insulation defects. The proposed cone-shaped sensor adopts a triangular short-circuit plate structure, achieving compactness and cost-efficiency while maintaining stable performance under various environmental conditions. Simulation analysis of reflection loss characteristics confirms that this sensor can serve as a diagnostic tool that meets the reliability and cost-efficiency requirements for power facilities.