Abstract
This research paper presents the impact study of apparent reactance injected by series Flexible AC Transmission System (FACTS) i.e. Thyristor Controlled Series Reactor (TCSR) on the measured impedance of a 400 kV single electrical transmission line in the presence of phase to earth fault with fault resistance. The study deals with an electrical transmission line of Eastern Algerian transmission networks at Group Sonelgaz (Algerian Company of Electrical) compensated by TCSR connected at midpoint of the transmission line. This compensator used to inject voltage and reactive power is controlled by TCSR. The simulations results investigate the three impacts of the apparent reactance injected by TCSR (X TCSR ) on transmission line protected by distance relay protection. The impacts concern the active and reactive power, the line impedance (reactance and resistance), and the short circuit parameters (symmetrical currents, line currents, symmetrical voltages and line voltages as well as the measured impedance by relay (resistance and reactance) in the presence of earth fault These impacts are investigated in order to improve the performances of distance relay protection. More the impact of X TCSR by three TCSR for cases studies is presented.
Highlights
Electrical power systems have to be planned, projected, constructed, commissioned and operated in such a way to enable a safe, reliable and economical supply of the load
The first generation has resulted in the Static Var Compensator (SVC), the Thyristor Controlled Series Capacitor (TCSC), the Thyristor Controlled Phase Shifter (TCPS), and the Thyristor Controlled Series Reactor (TCSR) [5]
The total impedance of electrical transmission line AB measured by distance relay without fault is [16], [17], [24], and [31]: The power system studied in this paper is the 400 kV Algerian electrical transmission networks at Algerian Company of Electrical and Gas which is shows in Fig. 7 [32]
Summary
Electrical power systems have to be planned, projected, constructed, commissioned and operated in such a way to enable a safe, reliable and economical supply of the load. The impact of second generation, specially the STATCOM is studying the performance evaluation of distance protection scheme which affect the apparent impedance calculations at relay point, has been carried out in [18], and the impact for apparent substance injected on Zseen in presence inter phase faults is reported [19]. The three impacts study is: The impact of the first generation on distance protection has been reported for general research on the influence of SVC on the transmission lines protection in [8] while the impact for apparent substance injected on measured impedance (Zseen) in presence inter phase faults for different locality, and in reference [9] acomparing effects of two types for SVC (TCR and TSC) on MHO distance protection setting zone in 400 kV Algerian transmission line. Impacts on parameters of measured impedance by distance relay (resistance and reactance)
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