HiDry⁷²: The Oil-Free and Safe Power Transformer for Sub-transmission Level

Abstract

HiDry⁷² is the safe and environmentally friendly solution in transformer technology for distribution and sub-transmission lines capable of reaching up to 63 MVA and 72.5 kV insulation level. The HiDry⁷² uses dry-type (non-oil) insulation materials to achieve these ratings. For the customer, this means superior safety and environmental friendliness for people and property. These advantages make the HiDry⁷² a product very suitable for applications in urban substations, power generation plants, substations located near or in public buildings or sensitive ecosystems, in cavern/underground locations and in crowded public places. This technology also provides the ability to install higher voltage systems directly to the main load centers; providing higher power and reducing distribution losses by reducing the amount of low voltage cable runs. The development of a dry-type power transformer for the 72.5 kV voltage class was already presented in 2011 [1]. Since then, a great interest has been shown in the market for many utilities as well as industries because all benefits inherent to the dry technology. In this abstract we report about the technology and some current projects in operation.