Determination of remanent magnetic inductions in toroidal cores of class P current transformers for relay protection
The analysis of existing approaches to determining the remanent magnetic induction coefficient in toroidal cores of current transformers for relay protection is carried out. A technique has been developed and the parameters of the physical model of a class P current transformer have been calculated. Five samples of the physical model of class P current transformers were made. Verification of the manufactured physical models of class P current transformers has been performed. Tests were carried out to determine the maximum values of remanent magnetic inductions for samples of physical models of current transformers. The regularities of the influence of load currents on the attenuation of remanent induction in the cores of current transformers are established.