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In this paper, the evaluation of the concept of impedance differential scheme for long transmission line protection is presented. Using the voltages and currents of both line ends, the differential impedance is calculated. Capacitive charging current which constitutes the main drawback of current differential protection is eliminated in presented protection method. What is more, the advantage of presented...
In this paper, we proposed a new mathematical model of a faulty photovoltaic generator operation. It presents its behavior, when it's subjected to the open-circuit and the short-circuit faults at its basic components as: cells, bypass diodes and blocking diodes. Such kind of modeling will allow developing fault detection and diagnosis methods. Indeed, the proposed model will be used to set normal...
Distance relays are sensitive to the power swings. So these are blocked during power swing to ensure reliability of the power system. However, if a fault occurs during a power swing, distance relay must operate to clear the fault with a high degree of selectivity and sensitivity. This paper presents a new symmetrical fault detection techniques during power swing based on differential three-phase instantaneous...
This paper presents a dc arc model to simplify the study of a critical issue in dc microgrids: series faults. The model is derived from a hyperbolic approximation of observed arc voltage and current patterns, which permit analyzing the arc in terms of its resistance, power, energy, and quenching condition. Recent faults staged by the authors on a dc microgrid yielded enough data to develop an arc...
In this paper, an accurate single-ended fault location algorithm using linear differential equations is introduced. Based on the R-L model of transmission lines, this algorithm is inferred from the differential equations of fault network and fault components network. The fault location linear differential equation takes the fault distance, fault resistance and source impedance (a resistance and an...
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