Research and Development of Algorithms for the Functioning of the Phase-to-Phase Overcurrent Protection Based on Data from Digital Transformers with Rogowski Coils for Overhead and Cable Power Lines 35 kV

The development of microprocessor technology has led to the creation of new types of instrument transformers that were not previously used in the electric power industry. Their characteristics require additional study of existing relay protection and automation algorithms and allow to develop of new ones. However, serious theoretical and experimental studies in all possible operating modes should precede the using of such algorithms. This article describes some aspects of the implementation of overcurrent protection that receives information in digital form from Rogowski coils and resistive voltage dividers, considering the key features and advantages of these type of sensors.