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RISS 인기검색어
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- 저자 : Babu T. Sudhakar (검색결과 2 건)
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A Synchrophasor-Based Line Protection for Single Phase-Ground Faults
Babu N. V. Phanendra,Babu P. Suresh,Roy Saptarshi,Babu T. Sudhakar,Bharadwaj Anil 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.3
Synchrophasor measurement data enhances the transmission line protection. This paper proposes an improved line protection against single phase-ground faults using synchronized phasor data. This algorithm prevents the relay mal-operation caused by high fault resistance. This algorithm calculates the phase difference between relay point voltage and fault point voltage based on the relation between negative sequence of relay point current and fault point current. After, the calculated phase difference between relay point voltage and fault point voltage will be compared with set point voltage phase referred from the relay point voltage phase. The fault detection action will be taken according to a certain phase difference relation between fault point voltage and set point voltage. This method is then applied to a practical single machine single line system. The results show that the suggested algorithm could determine in-line faults accurately with less computational time. It also has proved that this method is immune to the fault resistance, system conditions.
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Babu, A.G.,Shea, P.J.,Sudhakar, D.,Jung, I.B.,Oh, B.T. Academic Press 2015 Journal of environmental management Vol.151 No.-
Endophytic bacteria have the potential to promote plant growth and heavy metal(loid) (HM) removal from contaminated soil. Pseudomonas koreensis AGB-1, isolated from roots of Miscanthus sinensis growing in mine-tailing soil, exhibited high tolerance to HMs and plant growth promoting traits. Transmission electron microscope (TEM) analysis revealed that AGB-1 sequestered HMs extracellularly and their accumulation was visible as dark metal complexes on bacterial surfaces and outside of the cells. DNA sequencing of HM resistance marker genes indicated high homology to the appropriate regions of the arsB, ACR3(1), aoxB, and bmtA determinants. Inoculating mining site soil with AGB-1 increased M. sinensis biomass by 54%, chlorophyll by 27%, and protein content by 28%. High superoxide dismutase and catalase activities, and the lower malondialdehyde content of plants growing in AGB-1-inoculated soil indicate reduced oxidative stress. Metal(loid) concentrations in roots and shoots of plants grown in inoculated soil were higher than those of the controls in pot trials with mine tailing soil. Results suggest that AGB-1 can be used in association with M. sinensis to promote phytostabilization and remediation of HM-contaminated sites.
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