NDLI: Conductor protection against short circuit current: available $I*^{2}t$ evaluation

Content Provider	IEEE Xplore Digital Library
Author	Parise, G. Adduce, M.
Copyright Year	1998
Description	Author affiliation: Dept. of Electr. Eng., Rome Univ., Italy (Parise, G.)
Abstract	The admissible let-through energy I/sup 2/t allows consideration of the cable protection from overheating due to excessive short circuit current flowing in its conductors. For short circuit current duration of t<0.1 s, which is a range own for instantaneous tripping of protective devices in electric power systems below 600 V AC, the asymmetry of the current is of importance in the evaluation of the through energy. The IEC Standard suggests that the value of I/sup 2/t should be quoted by the manufacturer of the adopted protective devices. In the case of very short duration less than half-cycle, for which it is necessary to consider the protective device I/sup 2/t limiting behavior. The aim of this paper is to free the designer from the necessary knowledge of protective device behavior or from the need of prior manufacturers choice. The paper suggests evaluation of the prospective Joule integral, always referred to as RMS short circuit current by means a factor m, which considers the worst case (maximum value). Expressions and illustrations are given for m factor evaluation, which is variable with fault circuit conditions and prospective short circuit duration.
Starting Page	2336
Ending Page	2341
File Size	479398
Page Count	6
File Format	PDF
ISBN	0780349431
ISSN	01972618
DOI	10.1109/IAS.1998.730140
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-10-12
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature dependence Short circuit currents IEC standards Power system protection Aluminum Voltage Conductors Circuit faults Copper Conducting materials
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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