Research on the Influence of Different Grading Capacitors and Resistive-Capacitive Components on the Pre-strike Characteristics of Double-break Vacuum Circuit Breakers

Le résumé fourni par la source

Double-break vacuum circuit breakers (DBVCBs) are applied in reactive power compensation of power systems to reduce restrike probability during capacitor bank switching. Connecting shunt grading capacitors balances voltage distribution across breaks and enhances breaking capacity. However, switching capacitor banks-especially back-to-back-induces high-frequency inrush currents and overvoltages. Phase-controlled closing technique mitigates transients from closing capacitive loads for smooth transitions, requiring accurate pre-strike characteristics (e.g., pre-strike gap, dispersion, voltage, electric field strength). Current research on pre-strike characteristics of DBVCBs with shunt grading capacitors is limited. This paper experimentally investigates pre-breakdown characteristics of DBVCBs after highfrequency impulse current ablation under power frequency voltage, comparing conditions with/without grading capacitors and resistive-capacitive voltage grading. Experiments use 500 $\mathbf{p F}$ grading capacitors and $\mathbf{1 0 ~ k} \boldsymbol{\Omega} / \mathbf{5 0 ~ k} \boldsymbol{\Omega}$ resistors. Results clarify impacts of grading capacitors and RC components on prebreakdown characteristics, providing a basis for optimizing phase-controlled closing of DBVCBs and ensuring power system stability.

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