The detection of high impedance faults has been an important research field for many years. The insignificant increase of the line current in case of such faults makes their detection a difficult task, although at the...
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ISBN:
(纸本)9780956557025
The detection of high impedance faults has been an important research field for many years. The insignificant increase of the line current in case of such faults makes their detection a difficult task, although at the same time a crucial one for reasons of public safety. In this work, the influence of a high impedance fault on the line's overall input impedance is examined, for frequencies within both the CENELEC A Band and the typical high speed PLC range. The tested line configurations correspond to phase to phase and phase to ground signal injections. Also, the different effects of a high impedance fault according to the exact fault location and the line termination are investigated. Finally, a comparison among the results concerning the two selected frequency bands is conducted, in order to determine the one with the most desirable performance.
In this paper the effect of the magnetizing inrush currents, occurring during the energization of transformers, is examined. A case study is presented for an industrial arrangement consisting of five large transformer...
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ISBN:
(纸本)9781849193191
In this paper the effect of the magnetizing inrush currents, occurring during the energization of transformers, is examined. A case study is presented for an industrial arrangement consisting of five large transformers and three generators. The transformers are modeled using the Hybrid/XFMR model implemented in the well known transients program ATP-EMTP. This model can give an accurate representation of the core of the transformers. Various scenarios are simulated in order to investigate the occurrence of magnetizing inrush currents and the parameters affecting the peak value and the shape of the waveforms. Finally, various methods to reduce inrush currents are presented and evaluated.
In this paper, the distributed output regulation problem of linear multi-agent systems is considered. Its background includes active leader following for the agents to track a leader with different dynamics and unmeas...
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In this paper, the robust output regulation problem of a networked linear system with uncertainties is considered. Based on internal model, distributed control scheme is adopted to achieve the objectives of asymptotic...
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A novel noncoherent BPSK demodulator is presented for wirelessly-powered biomedical implants. The received data are detected based on rising or falling edge of the digitized carrier, while all components of the circui...
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A novel noncoherent BPSK demodulator is presented for wirelessly-powered biomedical implants. The received data are detected based on rising or falling edge of the digitized carrier, while all components of the circuit are independent of the carrier frequency. Besides simplicity and ultra low-power consumption, the proposed demodulator benefits from an outstanding data-rate-to-carrier-frequency ratio of 100%. Thus, it can easily achieve high data rates with lower carrier frequencies, which is desirable in implantable biomedical applications such as visual prostheses. The circuit is designed and simulated in a 0.18-μm standard CMOS technology and merely consumes 119-μW@1.8 V at a data rate of 10 Mbps. The proposed idea is also supported by experimental results of a proof-of-concept prototype.
The network model bases upon the energy hub concept, which was developed by the Vision of Future Energy Networks (VoFEN) research group at ETH Zurich in the last years. Keynote of the concept is a combined optimizatio...
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In this paper the effect of the magnetizing inrush currents, occurring during the energization of transformers, is examined. A case study is presented for an industrial arrangement consisting of five large transformer...
In this paper the effect of the magnetizing inrush currents, occurring during the energization of transformers, is examined. A case study is presented for an industrial arrangement consisting of five large transformers and three generators. The transformers are modeled using the Hybrid/XFMR model implemented in the well known transients program ATP-EMTP. This model can give an accurate representation of the core of the transformers. Various scenarios are simulated in order to investigate the occurrence of magnetizing inrush currents and the parameters affecting the peak value and the shape of the waveforms. Finally, various methods to reduce inrush currents are presented and evaluated.
Speech can be represented as a constellation of constricting events, gestures, which are defined at distinct vocal tract sites, in the form of a gestural score. Gestures and their output trajectories, tract variables,...
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The accurate evaluation of short-circuit currents is significant for the estimation of the maximum thermal and mechanical stress in electrical equipment and for the protection coordination of power systems. The IEC-60...
The accurate evaluation of short-circuit currents is significant for the estimation of the maximum thermal and mechanical stress in electrical equipment and for the protection coordination of power systems. The IEC-60909 standard is widely used for the calculation of maximum and minimum short-circuit currents. The calculation according to the ANSI standard is also a reliable tool for the proper selection of circuit breakers. Symmetrical and asymmetrical fault currents in a typical topology of an isolated synchronous generator feeding local loads, fault current results are calculated using IEC-60909 and ANSI standards and are compared to the corresponding obtained by the dynamic simulation using ATP/EMTP. The influence of different network parameters as well as of some simplifying assumptions on generator modeling in both standards is systematically investigated and differences between the static and the dynamic analysis are examined.
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