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Short-circuits in electrical networks come along with severe mechanical and thermal stresses not only to loads and systems, but also to the installed protection devices. Combined analytical simulations have been performed for analyzing and optimizing the behavior of low-voltage circuit-breakers. Especially circuit-breakers with electronic tripping units have been scrutinized.
New technologies and algorithms for an electronic short-circuit detection in low-voltage switchgears aiming for improvements in current limitation will be presented. For early short-circuit detection, the new "Cubical-Criterion" has been invented. The criterion uses the instantaneous values of current, current rise and current's 2nd derivatives with respect to time as a combined criterion...
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