Abstract
In this paper, the characterization of the voltage sag propagation under unsymmetrical faults through distribution transformer for low voltage power network is tested with the help of a power analyzer, which is based on sequence components. The voltage sag is a big issue of the power quality (PQ) for the power system networks, which must be analyzed and characterized for the suitable protection schemes and the control strategy, separately. In this study, the voltage sag characterization is fully examined under the unsymmetrical faults through the delta-star with ground (D-Yg) connection, which is commonly imlemented in the distribution power transformers. The MATLAB/Simulink and power analyzer tools are used to characterize the voltage sag propagation. The power analyzer works on the symmetrical sequence component’s method of the voltage. Moreover, the phasor diagram of the voltage sag is also given in this paper for better understanding. The obtained results would help in the design of the protection schemes for low-voltage and controlling the impact of voltage sag through filters.
Highlights
Power quality (PQ) is an important issue in electrical systems [1]
We look at three-phase transformers with one terminal to study the voltage drop distribution under an unbalanced fault, e.g., line-to-ground fault and the line-to-line fault with delta star-ground connection
The obtained results demonstrate the importance of voltage sag propagation on low voltage distribution transformers used for sensitive loads
Summary
Power quality (PQ) is an important issue in electrical systems [1]. PQ disorders are generally divided into two types: differences and measures [2]. Asymmetrical faults on transformer windings, supply voltage waveforms or sine waveforms, and load currents deviating from the nominal frequency cause the power. To fall into the distribution network [6]. Transformers are considered to be the main important and expensive equipment in the transmission and distribution system. Falling voltages on the different transformer winding connections result in different faults on the other side of the transformer winding. This slack spread is known as voltage drop spread and represents deflection current from high voltage level to low. The sag voltage distribution on the primary and secondary sides of the transformer is analyzed using a sequence analyzer. The following sections describe our methodology and detailed discussion on the obtained results
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