Protection in MV networks using electronic instrument transformers

This paper describes protection structures in MV networks, mainly the connection of instrument transformers (both inductive and electronic) and the measuring equipment used to analyze their signals. It summarizes the current situation and explains the ways in which this structure could be optimized and the design of it components simplified. Practical hints for such optimization are explained and examples are given. This paper also compares widely used protection schemes using classical inductive CTs/VTs with modern solutions offered by electronic CTs or VTs with extended performance.