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Impedance spectroscopy is a very powerful tool to characterize and separate physical processes that can occur simultaneously in any material. For parallel plate capacitors, consideration of the modulus has proven to be very effective to study materials that exhibit a spatial variation in conductivity in the direction of the electric field. This was demonstrated with in-situ impedance measurements...
To avoid performance fluctuation of radio frequency identification (RFID) system while the tag is attached on objects with different materials, a platform-tolerant UHF RFID tag antenna with stable high gain is proposed in this paper. The antenna is composed of an upper layer feeding loop and a lower layer planar dipole. Inductively coupling approach is adopted to feed, so that large mutual inductance...
Along with the rapid development of the power industry, distribution networks get more sophisticated. Traditional fault location methods have obvious drawbacks. In this paper, an accurate and efficient method based on multi- source information from protective equipment and FTUs (Feeder Terminal Unit) as well as voltage sag profiles from monitored node is proposed for fault location in distribution...
This paper presents a new impedance-based fault distance calculation formulation for power distribution systems. The majority of low- or medium- voltage distribution systems are characterized by having numerous branches, laterals and sub-laterals, highly unbalanced operation, and time varying load profile. All of these and other characteristics make most efficient approaches proposed for fault location...
The paper presents a new phase coordinate algorithm for analysis faulted AC double-circuit lines. Different topologies of double-circuit lines are considered. Different types of short circuit faults, inter-circuit faults and open conductor faults are treated in a general fault conditions. The development of the algorithm is based on the matrix transformation and port network theory in phase coordinates...
The conventional symmetrical components fault analysis method may not be practically feasible in case of the analysis of simultaneous faults, especially in inherently unbalanced power systems because of the difficulties encountered in the assembly of sequence networks and their solution. To alleviate these problems, this paper presents a new algorithm for computer which is suitable for analyzing arbitrary...
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