{Passive and Active DC Breakers in the Three Gorges-Changzhou HVDC Project}

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Title	{Passive and Active DC Breakers in the Three Gorges-Changzhou HVDC Project}
Publication Type	Journal Article
Year of Publication	2001
Authors	Andersson D, Henriksson A, B E SE
Journal	CIGRÉ Proceedings of the International Conference on Power Systems
Pagination	391–395
Keywords	bipolar transmission, dc breaker, grts, hvdc, metallic return, mrtb, multi terminal schemes, nbgs, nbs, sf6 breaker, transient analysis
Abstract	A new type of DC breaker, based on standard SF6 AC circuit breakers with auxiliary circuits will now be used in the Three Gorges-Changzhou HVDC Project instead of the old type based on oil-minimum breakers. To create the current zero necessary for arc extinction, a passive auxiliary circuit is used for lower currents, and an active circuit at higher currents. The passive circuit comprises a capacitor in series with a reactor, and a parallel non-linear resistor, across the breaker; in the active circuit the capacitor is precharged and inserted at a suitable time. The paper describes theoretical models and testing of the new breakers, and how they are implemented in reality.
URL	http://library.abb.com/global/scot/scot221.nsf/veritydisplay/0f838b2c7ee4629ac1256fda004aeabc/{\$}File/ICPS01Passive.pdf