Abstract
The paper presents a real power delivery system with essential consumers safety analysis. The two levels voltage networks 6kV and 0,4kV are modeled with the help of Edsa software and short-circuit simulation is conducted in order to obtain the computed values of the currents to all the network buses. The results are used to implement a technical solution for an important safety improvement of the analysed system.
Highlights
The main abnormal regimes encountered in electric power installations are overcurrents, voltage drops, frequency drops and overvoltages [1,2,3]
Overcurrents are caused by short circuits outside the protected element or by the occurrence of an overload
Overcurrents do not cause an immediate disconnection of the protected element, but if no action is taken against them, they can cause the conductors overheat and damage their insulation, which can lead to a short circuit
Summary
The main abnormal regimes encountered in electric power installations are overcurrents, voltage drops, frequency drops and overvoltages [1,2,3]. Voltage drops are caused by short circuits outside the protected area, which lead to voltage drops at the buses of the electric stations close to the fault These abnormal regimes have more effects on electric motors, reducing their speed or even in some cases stopping them. In addition of providing protection, the multifunctional relay can provide information on active and reactive power, current, voltage, power factor, frequency It has a memory circuit where you can store defects that have occurred in recent months and you can access them to decide if the equipment can still work [7, 8].
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