Evaluation of Cross-Differential Protection Applied to Double-Circuit Transmission Lines Under Inter-Circuit Faults

Vitor  R. Serpa; Tiago  R. Honorato; Kleber  M. Silva

doi:10.48011/sbse.v1i1.2456

Vitor R. Serpa University of Brasilia
Tiago R. Honorato University of Brasilia
Kleber M. Silva University of Brasilia

DOI: https://doi.org/10.48011/sbse.v1i1.2456

Keywords: Double-circuit lines, Cross-differential protection, Inter-circuit faults, Alpha plane, Power systems, ATP

Abstract

This paper deals with the performance evaluation of cross-differential protection applied to double-circuit transmission lines which share the same tower, considering the occurrence of inter-circuit faults. Aiming to do so, sensitivity and transient analysis were carried out on a 300 km double-circuit transmission line with 500 kV of rating voltage, modeled on Alternative Transients Program (ATP). By the analysis of the obtained results, the cross-differential protection function is able to detect faults between two different phases of the two existent circuits and has a high instantaneous coverage for such type of fault.