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Protection Planning and System Design to Reduce Arc-Flash Incident Energy in a Multi-Voltage-Level Distribution System to 8 \hbox {cal}/\hbox {cm}^{2} (HRC 2) or Less—Part II: Analysis

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1 Author(s)
J. C. Das ; AMEC E&C Services, Inc., Tucker, USA

This paper demonstrates that, in a multi-voltage-level (medium and low voltages) distribution system, the incident energy can be reduced to 8 cal/cm2 (hazard risk category 2) or even less, so that a personal protective equipment outfit of greater than two is not required. This is achieved with the current state-of-the-art equipment and protective devices. It is recognized that, in the existing distribution systems, not specifically designed with this objective, it may not be possible to reduce the arc-Flash hazard to this low level, unless major changes in the system design and protection are made. A typical industrial distribution system is analyzed, and tables and time-coordination plots are provided to support the analysis. Unit protection schemes and practical guidelines for arc-Flash reduction are provided. The methodology of IEEE 1584 is used for the analyses. Reducing HRC also reduces the fault damage to the equipment.

Published in:

IEEE Transactions on Industry Applications  (Volume:47 ,  Issue: 1 )