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A New Guidance for Circuit Breaker Rate Selection Including the Impact of Zero-Sequence X/R Ratio.
- Source :
-
IEEE Transactions on Industry Applications . Mar/Apr2022, Vol. 58 Issue 2, p1747-1755. 9p. - Publication Year :
- 2022
-
Abstract
- The multiplying factor (MF) is critical for the correct design, sizing, and selection of protection devices in a power system. This factor depends on the X/R ratio at the point of failure. The standards establish an equivalent MF for the X/R ratios for both three-phase and single-phase fault accordingly for engineering practices. However, X/R ratios for single-phase faults ignore how much from the total X/R ratio comes from the positive-sequence or zero-sequence X/R ratio. This research demonstrates that the total X/R ratio at the point of failure is not the only variable that affects how the multiplying factor changes. The results demonstrate with dynamic short-circuit simulations using EMTP-ATPDraw, which it is also necessary to establish the MF considering the differences of the X/R ratios of each sequence, respectively. To support the engineering designer in the correct selection of the protection device, this article proposes a methodology complementary to the standards, which allows establishing the multiplying factor using the X/R ratios of positive and zero sequence separately. The results show that both oversized and undersized design situations can occur when ignoring the zero sequence in particular scenarios. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00939994
- Volume :
- 58
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Industry Applications
- Publication Type :
- Academic Journal
- Accession number :
- 155866715
- Full Text :
- https://doi.org/10.1109/TIA.2022.3145777