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Keywords

high‑voltage circuit breaker; reactive power compensation; capacitive current switching; synthetic circuit; experimental teaching

Abstract

In power systems, the high‑voltage circuit breakers are routinely deployed to switch capacitor banks, thus optimizing reactive power compensation, enhancing power factor, minimizing power losses, stabilizing voltage, and elevating power supply quality. Consequently, the capacitive current switching experiment plays a pivotal role in assessing the effectiveness of high‑voltage circuit breakers. In laboratory settings, synthetic circuits are commonly employed to evaluate the capacitive current switching performance of these circuit breakers. This article introduces a novel synthesis loop for capacitive current switching, along with its corresponding operation sequence control system. This synthetic loop capitalizes on the phase angle characteristics inherent in three‑phase AC power supplies, enabling direct synchronization of voltage and current sources without the complexity of additional synchronization devices. This simplifies the operations and enhances the reliability. The timing control system for the loop comprises an upper computer software operating platform based on LabVIEW and a lower computer control unit based on Arduino. This setup achieves intelligent and visual control. The system design prioritizes resistance against electromagnetic interference and employs photoelectric technology for signal transmission, mitigating potential disruptions caused by high‑voltage and high‑current signals on control signals. Following rigorous testing, the entire control system demonstrated remarkable performance under high‑pressure conditions. This experimental teaching approach not only equips students with an good understanding of capacitive switching synthesis loop control schemes but also instills a comprehensive grasp of timing control principles. Moreover, it fosters practical skills in hands‑on operation and proficiency in engineering software applications, providing a solid foundation for future roles in related positions.

DOI

10.19781/j.issn.1673-9140.2023.04.028

First Page

257

Last Page

264

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