Comparison of Functionality of Non-Conventional Instrument Transformers and Conventional Current Transformers in Distribution Networks

In the development of electric, electronic, and information technologies in the medium and low voltage plants, designers reach out the moment of decision when it is necessary to choose equipment and systems that will be optimal for the set requirements. The smart grid concept in the power industry, especially at medium and low voltage, imposes the choice of equipment that will provide more data. The result of this development is the appearance of non-conventional instrument transformers and voltage sensors at medium and low voltage. Their dimensions, price, and functionality fit into these trends. Non-conventional instrument transformers (NCIT) and voltage sensors (VS) compete with conventional current transformers (CCT) and voltage transformers (VT). The paper discusses the specifics of replacing conventional with non-conventional instrument transformers and compares the measurement characteristics of both types, functionality, advantages, and disadvantages of both solutions.