Arc Characteristics of Ultra-Fast Opening Switching Contacts in Hybrid Breakers

Parekh, Mrunal; Magnusson, Jesper; Engdahl, Göran; Becerra, Marley

doi:10.1109/tpwrd.2020.3028829

Cited by 2 publications

(1 citation statement)

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“…In certain applications, it may be preferable not to use an LCS, for instance, because of the losses, and LCS-assisted triggering cannot be applied. Instead, a fast mechanical switch could build up an arc voltage sufficient to commutate i DC from the main path to the commutation path [34]. In this case, the originally proposed EAR DCCB configuration could potentially commutate faster compared to the simplified EAR DCCB configuration.…”

Section: Discussionmentioning

confidence: 99%

Experimental Study of Enhanced Active Resonant DC Circuit Breakers

Augustin

Becerra²,

Nee

2022

IEEE Trans. Power Electron.

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Enhanced active resonant (EAR) DC circuit breakers (DCCBs) are a novel type of DCCB that use a discharge closing switch as interruption medium. A technical limitation of discharge closing switches is the minimum voltage across the main gap required for successful triggering. A novel commutation process creating the minimum voltage internally is proposed, which allows to simplify the EAR DCCB configuration and to reduce its component count. In the prototype, the discharge closing switch is implemented with a triggered vacuum gap. Experiments show that the triggered vacuum gap can be triggered reliably down to a voltage of 50 V and that the discharge in the triggered vacuum gap is highly oscillatory at low current. The originally proposed EAR DCCB configuration has to be tuned such that the commutation to the triggered vacuum gap succeeds at low current. Conversely, the novel commutation process decouples the minimum voltage from the current level by adjusting the triggering delay. This allows reliable commutation irrespective of the operating conditions. It is shown that the novel commutation process does not adversely affect DC interruption. Proactive commutation operation and auto-reclosing strategies are demonstrated.

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Section: Discussionmentioning

confidence: 99%