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Three-phase detailed model of transformer plays a critical role in calculation and analysis for multi-voltage level distribution networks, its accuracy is directly related to the reasonableness of results. This paper presents a universal three-phase detailed model of transformer, which is derived with symmetric phasor method according to winding wiring and phase-shifting angle, and has general versatility...
This paper presents a numerical study of the system unbalance effect on system voltage and current calculation during asymmetrical faults. Two different system operational conditions are tested considering a voltage imbalance at the substation bus: balanced system loads and voltage imbalance equal to 3.65% due to system loads. Five fault impedances are simulated. Two fault analysis methods, the symmetrical...
This paper presents an efficient three-phase power flow algorithm for distribution network analysis. A new transformer model with various connections is implemented in the forward/backward sweep power flow method. The developed method provides an effective solution to the singularity problem of the nodal admittance submatrices appeared in some transformer configurations. Different load models and...
TiO2 nanotube layer was prepared by anodic oxidation of commercial pure Ti in aqueous solutions containing 1M (NH4)2SO4 and 0.5 wt% NH4F. The as-anodized layer consists of self-organized TiO2 nanotubes with amorphous structure, which transforms to anatase after annealing at 450 ??C for 3 h. The annealing treatment of the nanotube layer can significantly enhance its hydrophilicity and bioactivity....
A fully printable, passive and planar chipless RFID tag on thin flexible substrate is presented. The chipless tag encodes data into the spectral signature using a multiresonating circuit. Both amplitude and phase components of the spectral signature are used for data encoding. The tag comprises of a microstrip multiresonating circuit with 6 multi-spiral resonators and two cross-polarized UWB disc...
Most of current algorithms for face recognition involve considerable amount of computations and hence they cannot be used on devices constrained with limited speed and memory. In this paper, we propose a novel solution for efficient face recognition problem for the systems that utilize small memory devices and demand fast performance. The new technique divides the face images into components and finds...
This paper presents a new power-flow method for analyzing unbalanced distribution networks. In this method, an unbalanced distribution network Is decomposed to: 1) main three-phase network with three-phase line segments and 2) unbalanced laterals with two-phase and single-phase line segments. The proposed method allows solving the main three-phase network based on the decoupled positive-, negative,...
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