An economical and reliable DC circuit breaker for DC voltage > 3.5kV is not commercially available today. The lack of such a breaker has been inhibiting the development of DC power distribution in factories (especially processing plants with many variable speed motors); for microgrids (including on ships, oil platforms, and wind farms), and for multiterminal HVDC power transmission, as in the supergrid.
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Tuesday, February 7, 2012
Patent Submitted (US utility patent) on Ballistic Breakers
I submitted a patent application on Ballistic Breakers™ November 30, 2011, which is now abandoned. I submitted a much-refined patent application yesterday. The linked document is an excerpt from my (52 page, not including the 20 figures) patent application; the full application is proprietary for now, only available under NDA and/or to be shared with serious candidate investors. I am very pleased with the results, however. I plan to submit a paper soon that will reveal more information about what is in the patent (but not everything!).
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It would be nice if you discuss the functions of your Ballistic Breakers and what are the things that we can do with it. :)
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I only just saw this comment today, Emily; I did not mean to neglect this until now. I believe the Ballistic Breaker is applicable across the entire range of circuit breakers: AC and DC, all the way up to the highest transmission voltage. The breaker gets bigger (more stages) as the voltage goes up, and the mass of resistors goes up with the amount of magnetic energy that needs to be quenched during opening of the breaker. For a long HVDC transmission line the inductively stored magnetic energy can get into the hundreds of megajoules, which implies on the order of a ton of impulse-rated resistors. This is still a lot cheaper than ABB's power electronic-based HVDC circuit breaker. HVDC is not my starting point, however; my first application will be to MW-scale motors and generators, and microgrids.
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