Experience of using the turbine-generator units of the Kolyma hydroelectric station for idle discharge of water

Abstract

1. Before the start of reservoir drawdown it is necessary to clean the trash racks and water surface in front of the intake. It is necessary to provide for the possibility of cleaning during drawdown. These measures would help to reduce the time of drawing down the reservoir of the Kolyma hydrostation from 500 to 350 h. 2. The unit showed the possibility of long idling at a speed from 15% and higher. At speeds of 15–35% of the nominal it is recommended to continuously feed oil under pressure to the friction zone. 3. Discharges of less than 10 m3/sec passed through the unit with a stationary rotor. No unfavorable phenomena were noted in this case. To provide reliable operation with a stationary rotor, it is necessary to know the value of the maximum permissible torque absorbable by the jacks. 4. When drawing down a reservoir through the water passage of a unit the maximum discharge is reached during idling with a speed of 50–100% of the nominal. In the case of a decrease of the speed below 35% or when it is necessary to pass small discharges for a long time an operating regime with a stopped rotor is recommended.