On the standardization of requirements for current transformers and high-speed relay protection devices in transient short circuit conditions
The article analyzes the concept of «saturation criterion for CTs of classes P and PR in transient mode» and the terms «nominal and maximum limiting ratios of the primary current», as well as expressions for choosing the nominal limiting ratios of CTs of classes P and PR, comments are made on the methodology for testing high-speed URZ in transient short-circuit modes with the presence of an aperiodic component in the primary currents of the CT and the calculated values of the residual magnetic induction in the magnetic circuits of class R CT are proposed.