ABB has developed the world's first circuit breaker for high voltage direct current (HVDC). It combines very fast mechanics with power electronics, and will be capable of 'interrupting' power flows equivalent to the output of a large power station within five milliseconds - 30times faster than the blink of a human eye.
URL: http://www.green-energy-news.com/nwslnks/clips1112/nov12004.html
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