Open-core Power Voltage Transformer: Concept, properties, application

The Power Voltage Transformer, which is a single-phase unit used for direct conversion of power from high to low voltage, is becoming more and more relevant for substation application. This is why this paper aims to present the properties and advantages of the open-core design concept, which has been functioning very well for a number of years in inductive voltage and combined instrument transformers, enhancing the transformer reliability and operational safety. Furthermore, the intention is to list the known possible application options of these transformers and finally to succinctly point out the guidelines for future development, which would benefit both the manufacturer and the user.