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This paper proposes a practical solution of high-frequency-link dc transformer based on switched capacitor (SCDCT) for medium-voltage dc (MVDC) power distribution application. Compared to the traditional dc transformer scheme, the proposed SCDCT can disconnect from MVDC distribution grid effectively as a dc breaker when a short fault occurs in the distribution, can enhance power transfer capacity,...
The existing controllable spark gap has not been able to be widely applied to the high voltage grid so far mainly due to the constraint of reliability. This paper introduces a conceptual design of a new type of controllable multi-spark gap which improves the reliability dramatically on working principle. The multi-spark gap is composed of multiple air gaps and chained R-C network for producing frequency-dependent...
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