Evaluation of the limitations of a permissive overreach protection scheme in a distribution loop in case of cross country faults and proposal of alternative solutions. Issue 15 (31st August 2018)

• Record Type: Journal Article
• Authors: Borgnino, Alberto; Castillo, Manuel
• Is Part Of: Journal of engineering. Volume 2018:Issue 15(2018)
• Page Start: 924
• Page End: 929
• Publication Date: 2018-08-31
• Subjects: power grids -- relay protection -- power distribution faults -- overcurrent protection -- fault diagnosis -- power distribution protection; protection devices -- signal comparison schemes -- power system analysis software DIgSILENT PowerFactory -- permissive overreach scheme -- zero sequence phase comparison directional logic -- cross country faults -- alternative solutions -- negative sequence magnitude differential protection schemes -- permissive overreach protection scheme -- rapid fault clearance -- medium‐voltage distribution loop -- MV loop -- European distribution system operators -- steady‐state short‐circuit calculations -- electromagnetic transient simulations; Engineering -- Periodicals; Engineering; Electronic journals; Periodicals; 620.005
• DOI: 10.1049/joe.2018.0260
• Languages: English
• ISSNs: 2051-3305

Abstract

Abstract : This study evaluates the performance of a permissive overreach protection scheme proposed to ensure rapid fault clearance, in a real example of a medium‐voltage (MV) distribution loop by one of the largest European Distribution System Operators. The MV loop and the protection devices including the proposed signal comparison schemes have been modelled in detail in the power system analysis software DIgSILENT PowerFactory. The evaluation has been performed using steady‐state short‐circuit calculations and electromagnetic transient simulations. This analysis reveals limitations in the permissive overreach scheme based on the zero sequence phase comparison directional logic in the case of cross country faults. Alternative solutions, such as phase, zero sequence and negative sequence magnitude differential protection schemes, have been assessed. A permissive overreach protection scheme based on the negative sequence phase comparison directional algorithm has also been considered.