Abstract
Suggestions on how to improve the protective characteristics of automatic low-voltage breakers, namely, to increase the sensitivity to remote short-circuits (faults), to raise the speed of selective protection, and to enhance the reliability by long-distance (remote) backup are considered. The use of the power function of a current to quickly identify the reason for a circuit disturbance and determine the rms current value of the current’s periodic component is grounded. Advantages of the use of the Joule integral as a criterion to selectively operate breakers are shown.
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