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The current injection based mechanical DC circuit breakers (MDCCB) are widely applied for its superiority of low on-state losses and low cost. To realize full range current interruption and high dielectric recovery strength, a novel topology of MDCCB is proposed in this paper. The commutation path consists of two parallel capacitors, small capacitor for small current interruption, and small capacitor parallel with large capacitor for large current interruption. By using bridge type circuit, sufficient dielectric recovery time is provided. Moreover, interrupting characteristics under different combination of small and large capacitors is analysed by simulation. And the principle of optimal capacitors value assignment and the design method of breaking threshold current of using large capacitor are obtained. Finally, a simulation model is built to verify the proposed breaking scheme.
Inspec keywords: capacitors; circuit breakers
Subjects: Switchgear; Capacitors