Development of a supervisory system for an intelligent transformer

Electronic on-load tap changers (OLTCs), embedded with remote monitoring and control systems, represent a low-cost and simple solution to deal with the voltage regulation problem in a near future. These devices are able to operate in automatic or manual modes, enabling automatic voltage regulation or the operation with a specific tap selected by the power utility, allowing to reduce the transformer losses and to improve the voltage regulation. Such OLTCs require a user-friendly interface for remote monitoring and control. So, in this paper it is presented the development of a supervisory system for a distribution transformer with electronic OLTC, describing useful features for future applications in smart-grids and their benefits for enhancing the power quality and distribution system management.