Russian nuclear utility Rosenergoatom has marked a significant milestone by delivering crucial equipment for the 110/10 kV transformer substation at the Leningrad Nuclear Power Plant (NPP). The delivery includes a robust stationary power three-phase transformer, weighing over 40 tonnes. This transformer will play a vital role in supplying power for welding machines, compressors, lighting devices, tower cranes, and various other equipment essential for the construction of units 7&8 at the Sosnovy Bor site in the Leningrad Region.

The equipment is currently undergoing an input control procedure to ensure its quality and compliance with the project specifications. Once confirmed, the transformer will be installed on a specially prepared foundation. Following this, it will undergo enhancements, including the addition of a cooling system, relay protection, automation equipment, and other necessary elements. Specialized tests will be conducted to verify the transformer's readiness for operation after completing all electrical and commissioning work.

Evgeniy Milushkin, Deputy Director for Capital Construction and Head of the Capital Construction Department of Leningrad-II, emphasized that the 110/10 kV transformer substation is expected to be operational in the first quarter of 2024. This timeline aligns with the commencement of the main construction phase for units 7&8, involving 150 buildings and structures, primarily for the nuclear and turbine islands. The substation will play a crucial role during commissioning, testing, and subsequently serve as a reserve power supply in emergency situations.

As part of the expansive construction effort, more than 27 kilometers of high-voltage cable is being laid to connect the substation with other distribution devices. The new VVER-1200 units (7&8) are set to replace units 3&4, with commercial operation expected in 2030 and 2032. The completion of the 110/10 kV transformer substation is a pivotal step in ensuring the efficient and reliable power supply for the upcoming units at the Leningrad NPP.

Source: neimagazine.com