Leningradsky Metallichesky Zavod (LMZ) completed the manufacture of the second impeller as part of the Tupalang HPP update project. The equipment is designed for hydropower unit (HU) No.4. Completion of the whole set of equipment for the HU No.4 upgrade is scheduled for Q2 of 2021.
The contract for the design, manufacture, and supply of hydraulic equipment for the four hydropower units of Tupalang HPP was concluded with JSC "Uzbekhydroenergo" in 2019 and entered into force in April 2020.
Hydro turbines and generators with a capacity of 72.5 MW will be manufactured for the HUs No. 1 and No. 2 that are under construction. In addition, the scope of supply includes electrical equipment, APCS, generator excitation systems, pre-turbine gate valves and HPP auxiliary equipment. For the existing HUs Nos. 3 and 4 – new impellers, equipment for the upgrade of turbine control systems, APCS and excitation systems. Also, the scope of Power Machines obligations includes pre-commissioning services for the supplied equipment.
The impellers for HU Nos. 3 and 4 are scheduled to be shipped in March 2021.
The commissioning of four HUs will be carried out in stages; the project is planned to be completed in 2022. The total capacity of Tupalang HPP will be 175 MW.
In the course of the upgrade, in addition to impellers replacement, HUs Nos. 3 and 4 will be equipped with modern turbine automation systems and automatic control of pre-turbine gate valves. The hydro turbines will be equipped with speed encoders, vibration sensors, shaft runout sensor, overspeed protection unit, new instrumentation, and electrical wiring.
The construction of Tupalang HPP is carried out in two stages. At the first stage, the HUs No. 3 and No. 4 with a capacity of 15 MW each were put into operation. The equipment was manufactured by LMZ and the Electrosila plant. At the moment, the second stage of the project is in progress - the expansion of the plant's capacity to four HUs, due to the construction of two more units Nos. 1 and 2 with a capacity of 72.5 MW, as well as the replacement of temporary impellers with standard ones and the upgrade of the control systems equipment for the small HUs Nos. 3 and 4.