Sevan hydroelectric station

Sevan hydroelectric power station (Ozernaya hydroelectric power station) is a hydroelectric power station on the Hrazdan River, near the city ​​of Sevan , Armenia . It is part of the Sevan-Hrazdan cascade .

Sevan hydroelectric station
Entrance portal of Sevan hydroelectric station
A country	Armenia
River	Handed out
Cascade	Sevan-Hrazdan
Owner	CJSC International Energy Corporation
Status	acting
Years of input units	1949
Main characteristics
Annual electricity production, mln kWh	130 (15)
Kind of power plant	derivational
Design head , m	60.3 (45)
Electric power, MW	34.24 (25)
Characteristics of the equipment
Type of turbines	radial axial
Number and brand of turbines	2x, 1x
Number and brand of generators	2 × GS 2615, 1 × CA 106
Power of generators, MW	2 × 16.96 (12.5), 1 × 0.32
Main facilities
Dam type	not
Gateway	not
Outdoor switchgear	110/35 kV
On the map

Sevan hydroelectric station is the head station of the cascade, providing water intake from Lake Sevan. The construction of the hydroelectric power station began in 1936 ^[1] , however, with the beginning of World War II, it was mothballed and was resumed after the end of the war. The first hydraulic unit was launched in 1949 ^[2] .

The design capacity of the hydroelectric power station is 34.24 MW, actual, due to a decrease in the level of Lake Sevan, is about 25 MW. The design average annual output is 130 million kW · h, actual in recent years - 15 million kW · h. The design head is 60.3 m, the actual head is 45 m. Structurally, it is a derivational hydroelectric power station with an underground building of the hydroelectric power station. The composition of hydroelectric power plants: ^[2]

• coastal water intake equipped with a fish protection device;
• supply channel;
• second stage water intake;
• underground turbine conduit;
• underground building of hydroelectric power station;
• a discharge tunnel 5.5 km long;
• Switchgear;
• ground control building.

The shore water intake has three openings and is equipped with a fish protection device consisting of three fish collecting tunnels that are connected to a fish collector and a discharge tunnel for fish fry. The shore water intake serves to supply water from Sevan to the hydroelectric power station while simultaneously dumping fish fry back into the lake without injuring them. The collected water is supplied to the earthen supply channel laid along the old bottom of the lake. At the end of the canal there is a second stage water intake equipped with two dividing receiving holes located at a distance of 32 m from each other and overlapped by two gates. The water intake is connected to an underground turbine water conduit branching in front of the hydroelectric power station into four strands for supplying water to two turbines and two needle gates ^[2] .

The building of the hydroelectric power station is underground, located at a depth of 100 m from the surface of the earth, consists of turbine and water outlet blocks. Two needle gates are located in the water outlet block, which allow water to pass through the hydroelectric station past the hydraulic units in the event of an emergency shutdown of the hydroelectric power station. The building has three radial-axial hydraulic units - two main (vertical) and one auxiliary (horizontal). Turbines manufactured by NOHAB, generators - ASEA (both Swedish). The design capacity of each of the main hydraulic units is 16.96 MW, however, due to a decrease in the level of Lake Sevan by 18 m, the actual capacity is about 12.5 MW. The auxiliary hydraulic unit with a capacity of 0.32 MW serves to supply the station's own needs. The waste water from the hydraulic units is discharged into a discharge chamber, which passes into a 5.5 km non-pressure tunnel that mates with the supply channel of the Atarbekyan hydroelectric station ^[2] .

The owner of the station is CJSC International Energy Corporation, 90% of the shares of which belong to the Russian OJSC RusHydro . The equipment of the hydroelectric station is outdated, its replacement and reconstruction is required. In 2010, the water intake and fish protection device were reconstructed ^[3] .