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A fault diagnosis algorithm for asymmetric modular architectures
IEEE Transactions on Computers, 1981Summary: This paper is devoted to the analysis of an algorithm for the automatic fault diagnosis of asymmetric modular networks. The network model used is the one proposed by [\textit{F. P. Preparata} et al., IEEE Trans. Electron. Comput. 16, 848--854 (1967; Zbl 0189.16904)], the faults are assumed to be solid, and the Hakimi-Amin t-diagnosability ...
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Symmetrical and asymmetrical fault currents
2004In the previous chapter, we saw how to calculate the symmetrical fault current. This is important from the RMS heating point of view, but for distribution switchgear engineers, the asymmetrical current is of much greater importance for a number of reasons that will be discussed in this chapter.
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A fast simulation model of PMSG with asymmetric control during an asymmetric grid fault
2016 China International Conference on Electricity Distribution (CICED), 2016This paper presents a fast simulation method of PMSG, which adopts positive and negative sequence current separate control strategy during an asymmetric grid fault. Based on analysis of fault characteristics, the asymmetric control strategy is developed in PSCAD, aiming to alleviate the adverse effects on converter and grid during an asymmetric grid ...
Guobing Song +4 more
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Development of asymmetric basins along continental transform faults
Tectonophysics, 1992Abstract Many basins associated with wrench or transform faults are asymmetrical, both longitudinally and laterally; the sense of basin asymmetry changes along the strike of transform faults. Geophysical data from the Dead Sea rift and other transforms indicate that wrench-induced asymmetric basins are bounded on only one side by a transform fault ...
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A New Digital Relay for Generator Protection against Asymmetrical Faults
IEEE Power Engineering Review, 2001Under unbalanced conditions the three phase instantaneous power oscillates at twice the power system frequency. The magnitude of these oscillations can be used as a measure of the system unbalance. This article has introduced a new digital relaying algorithm designed to detect asymmetrical faults by monitoring the sinusoidal oscillations of the three ...
O. Usta, M. Bayrak, M.A. Redfern
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A Three-phase Nine-level Fault Tolerant Asymmetrical Inverter
Arabian Journal for Science and Engineering, 2018The reliability in inverters has gained a vast importance for their enhanced economic operation of the system. This paper proposes a three-phase reliable nine-level inverter with fault ride through capability. The proposed inverter synthesizes nine levels in the output with two asymmetrical voltage sources configured at a ratio of 1:3 under healthy ...
Santosh Kumar Maddugari +4 more
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Three phase induction machines asymmetrical faults identification using bispectrum
IEEE Transactions on Energy Conversion, 1995Bispectrum analysis is introduced for three-phase induction machine faults identification and condition monitoring. Bispectrum analysis is capable of providing more information than power spectrum analysis. In the present investigation, machine vibration signals operating at different rotating speed and degree of unbalance are thoroughly analyzed. Very
T.W.S. Chow, null Gou Fei
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Analysis on IIDG's negative-sequence current upon asymmetric fault
2016 China International Conference on Electricity Distribution (CICED), 2016As a large number of distributed generations (DG) are connected to the distribution network, the fault current of the distribution network has been changed, and the reliable operation of relay protection in the distribution network has been influenced.
Hua Shao +5 more
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Grid forming fault ride-through capability under asymmetrical and symmetrical grid faults
IET Conference Proceedings, 2023N. A. Hidayatullah +3 more
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Diagnosability of system faults with propagation under asymmetric invalidation
Microprocessing and Microprogramming, 1988Abstract We proposed in [1] considering the influence of fault propagation on the diagnosability of an interconnected system. In addition to the parameter t of the number of faulty units, a parameter k was introduced of the number of components consisting of faulty units, so as to capture the effect of fault propagation.
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