The equation of a rotating circular magnetic field in three-phase current transformers of the devices for protective tripping against leakage currents

摘要

An analysis of the operation of a three-wire three-phase current transformer, which is used in devices for protective tripping against leakage currents under symmetrical load conditions, is proposed. This analysis makes it possible to investigate the operation of three-wire and four-wire three-phase current transformers of protective tripping devices under unsymmetrical load conditions, and also the operation of two-wire transformers of these devices.