Abstract
Because of an upcoming modernisation of the electricity distribution network in the SIDER EL HADJAR steel complex, a new calculation of the short-circuit current must be taken into account. The objectives are to determine the precise values of the currents of maximum and minimum fault by each start 225 kV, 63 kV and 15 kV of the distribution network to ensure the reliability of the existing system, and to validate the sizing of the 63 kV bus bar follows the increase of the load of the transformer station P4 by replacing the 70 MVA transformer with a 120 MVA transformer and comparing the results to the old computation. The calculation of short-circuit currents is a key step in qualifying the equipment to withstand the thermal and electromagnetic effects. So, to appreciate the reliability of numerical computation of the currents of short circuits requires modelling and simulations with software NEPLAN V5.
 Keywords: Initial short-circuit current, power supply system (SIDER EL HADJAR), IEC 60909-0, peak value of short-circuit current, NEPLA software.
 
Highlights
Faults of short circuits in the power system cannot be avoided despite careful planning and design, good maintenance and thorough operation of the system
The short-circuit depends on various parameters, such as the voltage level, the impedance at the fault point, and requires a detailed knowledge of the parameters of the network (Amiar, Adjabi & Logerais, 2016; Kunder, Paserba & Ajjarapu, 2004; Nedic, Bathurst & Heath, 2007; Scheifele & Waider, 1998; Schlabbach, 2005)
Even if the sends are connected to the Bus bar B through the coupling circuit breaker (DC 2), the total current produced by the two transformers in parallel is 1916 A
Summary
Faults of short circuits in the power system cannot be avoided despite careful planning and design, good maintenance and thorough operation of the system. Influences from outside the system include factors such as short circuits following lightning strokes into phase conductors of overhead lines and damages of cables as well as the internal faults due to ageing of insulation materials. Short-circuit currents, have an important influence on the design and operation of equipment and power systems. The short-circuit depends on various parameters, such as the voltage level, the impedance at the fault point, and requires a detailed knowledge of the parameters of the network (Amiar, Adjabi & Logerais, 2016; Kunder, Paserba & Ajjarapu, 2004; Nedic, Bathurst & Heath, 2007; Scheifele & Waider, 1998; Schlabbach, 2005)
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