Major repair of power equipment is completed at Vygostrovskaya HPP of TGC-1


TGC-1 power specialists have completed major repair of hydroelectric unit No. 2 at Vygostrovskaya HPP of the Vyg HPPs Cascade. After acceptance testing for 48 hours under load was passed successfully, the unit was hooked up.

A large volume of scheduled and unconventional work was performed under the major repair: dismantling and disassembly of the impeller with replacement of bronze bearings and blade sealing; overlay and grooving of the turbine roll shell, butt ends of the generator roll, turbine and top roll; correction of the generator rotor shape; partial rewedging of the stator slots of the generator; replacement of oil coolers and pipelines of the technical water supply system; injection of concrete behind the lining of the impeller chamber and behind the stator turbine ring.

"Repair and Maintenance Programme at the Vyg HPPs Cascade is aimed at providing uninterrupted operation of the equipment, as well as improving operational efficiency of the plants and raising the environmental safety," said Marina Telmanova, Director of the Vyg HPPs Cascade of TGC-1. "Thus, in 2015–2016, we performed the major repair of hydroelectric unit No. 1 at Vygostrovskaya HPP and replaced excitation systems of the both hydroelectric units."


Construction of Vygostrovskaya HPP was started in 1959 and was completed within tight timeline: two years and eight months. Its commissioning was of a critical economic importance for the Republic of Karelia: being a part of the Vyg HPPs Cascade, the power plant supplies electricity to a number of the key industrial enterprises of the region, Segezha Pulp and Paper Mill and White Sea-Baltic Canal.

Vygostrovskaya HPP is equipped with two hydraulic units with a total installed capacity of 40 MW. Its average yearly output is 224 million kWh.