A Novel Ground Fault Non-Directional Selective Protection Method for Ungrounded Distribution Networks

Energies

Ricardo Granizo¹  Francisco R. Blánquez²  Emilio Rebollo²  Carlos A. Platero² 

[1] Department of Electrical Engineering, Escuela Técnica Superior Ingenieros Industriales, Technical University of Madrid, C/José Gutierrez Abascal, 2, Madrid 28006, Spain;

关键词: earth faults;    protection;    distribution protections;    electrical distribution networks;   

DOI  :  10.3390/en8021291

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.