Differential Protection of Single-Phase Transformer using LabVIEW

Transformer protection is a difficult problem in power system relaying. Because it is critical to reducing the frequency and duration of unwanted outages, there is a strong demand placed on power transformer protective relays. A novel method is described in this paper for standardized, current-based, single-phase or three-phase transformers. Differential protection of transformers is capable of distinguishing between internal and external faults and can operate for internal faults only. Faults that are slowly developing inside the transformer are not easily detected using other methods and, in such circumstances, differential protection is used. Differential protection is implemented using LabVIEW providing an opportunity to study this form of protection in depth