NDLI: Modified Medium-Voltage Arc-Flash Incident Energy Calculation Method

Content Provider	IEEE Xplore Digital Library
Author	Wu, A.Y.
Copyright Year	1972
Abstract	The IEEE Standard 1584-2002 provides a guide for conducting arc-flash hazard analyses for low- and medium-voltage systems. Users, however, need to be aware that the models in the guide were based on the measurements of arc incident energy under a specific set of test conditions combined with theoretical work. In the medium-voltage arc-flash analysis, the incident energy calculation, according to the guide, is a function of system voltage, gap between conductors, the distance from the possible arcing point to the worker, the bolted three-phase fault, and the arc clearing time from the source-side protecting device. However, the effect of fault current decaying is not considered in the current guide. According to an IEEE-recommended short-circuit calculation method, the fault contributions from generators and induction and synchronous motors would usually decay over the short-circuit period based on their short-circuit time constants and the excitation system. Therefore, the standard calculated incident energy from short-circuit point of view would be higher than the value if the effect of decaying current were considered. On the other hand, the arc clearing time according to the current guide is derived from the initial bolted three-fault current, which would result in a shorter arc clearing time. As a result, the standard calculated incident energy value from arc clearing point of view would be lower than the value if the effect of decaying current were considered. Therefore, there are two conflicting elements contained in the current guide, which may result in an inconclusive personal protective equipment requirement. This paper will present a modified incident energy calculation method based on the decaying three-phase fault current and also based on the arc clearing time derived from decaying three-phase fault current at the time of fault interruption. A sample calculation and a comparison of the results of the current method and the modified method are presented in this paper.
Sponsorship	IEEE Industry Applications Society
Starting Page	1866
Ending Page	1872
Page Count	7
File Size	571841
File Format	PDF
ISSN	00939994
Volume Number	46
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Medium voltage Circuit faults Fault currents Hazards Low voltage Energy measurement Testing Conductors Protection Power engineering and energy decaying three-phase fault current Arc clearing time arc current arc incident energy arc-flash analysis
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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