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The development of industrial and residential customers technologies and electric equipment affects the power quality parameters of distribution networks. When the supply voltage of distribution networks is distorted by nonlinear loads, then the equipment of customers draws non-sinusoidal currents from the network which can produce many technical problems. Thus, one of major research problem is to...
The renewable sources' influence on the distribution network expansion planning is tackled. The optimal expansion solution and other alternatives (quasi-optimal) are analyzed and a final one is proposed. Network reconfiguration and N-1 contingencies are performed. The power flow is computed using conventional methods, but the optimal power flow and distribution network expansion are performed using...
Principle of Minimum absorbed Power (PMP) is defined and demonstrated as a fundamental for electrical circuits in stationary and quasi-stationary regime. By imposing the PMP natural conditions result Kirchhoff Current Law (KCL) and Nodal Method (NM). First aim of this paper is to propose a new formulation of basic forms of circuit equations by substituting the KCL or NM equations with PMP equations...
The effect of Cr 2 O 3 particle size on the densification of magnesia refractories was investigated. Magnesia grains (<45μm) were mixed with 2wt% of micro-Cr 2 O 3 (2μm) and nano-Cr 2 O 3 particles (10–20nm) and sintered at 850–1450°C, for 5h in air. The progress of the densification and phase evolution of samples was studied with the support of X-ray...
The solid solubility of magnesia in magnesium aluminate spinel and magnesium aluminate spinel in magnesia does not change with temperature thus not creating bonds or precipitation over periclase grains in a single stage sintering process. In comparison, the precipitated spinels in magnesia-chromia refractories form complex spinel due to inversion in the position of bivalent and trivalent cations within...
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