Asymmetric Capacitive Sensor for On-line and Real-time Partial Discharge Detection in Power Cables

초록

Partial discharges (PD) have long been recognized as a major contributing factor to catastrophic failures in high-power equipment. As the demand for high voltage direct current (HVDC) facilities continues to rise, the significance of on-line and real-time monitoring of PD becomes increasingly prominent. In this study, we have designed, fabricated, and characterized a highly sensitive and cost-effec-tive PD sensor comprising a pair of copper electrodes with different arc lengths. The key advantage of our sensor is its non-invasive nature, as it can be installed at any location along the entire power cable without requiring structural modifications. In contrast, con-ventional PD sensors are typically limited to installation at cable terminals or insulation joint boxes, often necessitating invasive alter-ations. Our PD sensor demonstrates exceptional accuracy in estimating PD location, with a success rate exceeding 95% in the straight sections of the power cable and surpassing 89% in curved sections. These remarkable characteristics indicate its high potential for real-time and on-line detection of PD. © 2023, Korean Sensors Society. All rights reserved.

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