Application of Synchrophasor Measurement to Restore the Secondary Current of the Saturated Current Transformer

Abstract

Currently, electromagnetic current transformers (CT) are widely used in the electric power industry as primary current transmitters. A feature of their design is the presence of a ferromagnetic core, which in certain transient modes of operation of the power system (for example, a short-circuit) can be saturated, while causing non-linear distortion of the secondary current. This can reduce the sensitivity and speed of relay protection devices [1] .