Abstract
This paper presents a new selective and non-directional protection method to detect ground faults in neutral isolated power systems. The new proposed method is based on the comparison of the rms value of the residual current of all the lines connected to a bus, and it is able to determine the line with ground defect. Additionally, this method can be used for the protection of secondary substation. This protection method avoids the unwanted trips produced by wrong settings or wiring errors, which sometimes occur in the existing directional ground fault protections. This new method has been validated through computer simulations and experimental laboratory tests.
Highlights
Distribution power systems are equipped with sophisticated protection devices to keep them safe from overloads, short circuits, voltage sags and drops and, in general, any operation conditions out of rated values, something which might represent a clear danger to the facilities, and to the power system operation
To test the validity of the proposed single phase ground fault (SPGF) detection method and its computer simulation results, different laboratory tests have been performed on an isolated network
A new selective single phase ground fault technique for neutral undergrounded networks has been presented in this article
Summary
Distribution power systems are equipped with sophisticated protection devices to keep them safe from overloads, short circuits, voltage sags and drops and, in general, any operation conditions out of rated values, something which might represent a clear danger to the facilities, and to the power system operation. Energies 2015, 8 and have the advantage that a single phase ground fault (SPGF) of the system does not produce high ground fault overcurrents; the whole system remains operational In this case, the power system must be designed to withstand high transient and permanent steady state over voltages, so its use is generally restricted to low and medium voltage systems. The existing protection devices use directional ground fault criterion, measuring the residual current, the residual voltage and the phase shift between them This relay provides ground fault detection, but presents important operational difficulties that could imply unwanted tripping commands.
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