PROJECT TITLE :
Design Guidelines for Safer Low-Voltage Distribution Systems
It's a challenge to style low-voltage distribution systems for sensitive arcing current detection while maintaining selective coordination. This paper provides recommendations for maximum low-voltage feeder-breaker current ratings that permit a unit-substation secondary-main circuit-breaker short-time or instantaneous trip to be sensitive enough to detect and trip on arcing currents, whereas retaining coordination with the feeder-breaker settings. The recommendations are organized according to transformer kilovolt-ampere rating. Still, mentioned are other variables, such as primary-supply impedance, instantaneous-pickup tolerance of the feeder, and extended transformer ratings.
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