Ganz

Ganz of Hungary manufactured the 34 kV / 150 kV step-up power transformer installed at the Offshore Windpark Egmond aan Zee (OWEZ) onshore substation near Wijk aan Zee. The transformer is the central asset of the OWEZ shore-side electrical interface, taking the 34 kV aggregated output of the three shore connection cables from the wind farm and stepping it up to 150 kV for transmission into Continuon's national electricity grid. Per the OWEZ-R-141 General Report: "In the OWEZ substation the voltage of the electric power from the wind park is stepped up from 34kV to 150kV. One transformer has been installed which was manufactured by Ganz of Hungary. The size of the transformer itself is about (lxwxh) 10mx5mx4m and it weighs 22 tons excluding the 4 tons of oil needed for insulation and cooling." To prevent corrosion from coastal salt and dust the transformer is enclosed within a concrete building of approximately 24 m × 6 m × 7 m, with the oil cooler mounted on the roof and operating by natural convection (hot oil rising / cool oil descending), eliminating the need for a pumping system. The transformer was lifted into position after the substation building neared completion, with its oil cooler installed last. As a subcontractor selection within the BCE EPC scope, Ganz's involvement reflects the more open European supplier base for power-transformer equipment in mid-2000s Dutch offshore projects.