Supply and installation of a 16 MVA power transformer for a wind farm on the Virtsu coast. The unit steps up the 21 kV voltage from wind generators to the 115 kV high-voltage grid level, enabling energy transport to the national power grid.
The Virtsu wind farm is located on the Western Estonian coast, where winds are exceptionally stable and strong by Estonian standards. Connecting the park to the grid required a powerful power transformer capable of withstanding the rapid load fluctuations characteristic of wind energy.
We supplied a Siemens 16 MVA transformer with voltage levels 115/21 kV and installed it on a special concrete foundation that isolates vibration. The most complex part of the project was configuring the OLTC (on-load tap changer) — the automatic voltage controller ensures that despite variable wind production, the transmission voltage remains within Elering's required ±5% tolerance.
The entire installation passed Elering's official inspection procedure and received grid connection approval.
