Information Bases of Protection Algorithms Against Single-Phase Ground Faults of a Generator Operating on Busbars Part II. Study of Information Bases of Algorithms in Which Null-Sequence Components Are Used

Abstract

Information bases of algorithms against single-phase ground faults for stator protection of a generator operating on busbars are studied. The cornerstone of the analysis is the use of the universal network model examined in part I of this article (Élektricheskie Stantsii, 2019, No. 1). The information bases of algorithms are used in which the fundamental harmonic of a current, the basic and third harmonics of zero-sequence voltage, and low-frequency harmonic injection into a network are studied. The efficiency of the existing algorithm based on control of a harmonic injected into a network is found. However, application of these protections requires installation of additional equipment in the network and is associated with degradation of the electric power and the characteristics of other RPA devices.