ATP/EMTP model of TPX, TPY AND TPZ current transformers for realistic testing of protection devices

Influence of electromagnetic forces in the gaps of a protective CT

“…The class TPY has a small gap and a residual flux reduction to 10% and the class TPZ is designed with larger gaps assuring a neglectful residual flux. Many types of researches have made its way to evaluate the differences between the gapped core CT classes such as the studies in [7,8]. The study in [7] has shown an application of the analysis of magnetic fields to estimate the influence of the core design in the errors in transformation of class TPZ CT.…”

“…The study in [7] has shown an application of the analysis of magnetic fields to estimate the influence of the core design in the errors in transformation of class TPZ CT. Meanwhile, the study in [8] showed transient simulation models for TPY, TPZ and TPX (which is a denomination for closed core protective CT). This paper aims to develop a model to verify specific protection applications, considering the design of the protection system and the dimensioning of the CTs.…”