Modernization of Hydroturbines—New Approach to Effectiveness, Reliability, Environmentby I. M. Pylev, LMZ, Leningrad, Russia,
Abstract: Renovation of hydraulic turbines is one of the major lines in LMZ production and is aimed at rehabilitation of hydroturbines and increasing efficiency, rated output and energy production. Difficulties imposed by new operating conditions (many transient operations, higher output with unchanged overall dimensions and suction head, environmental requirements) necessitate use of advanced methods of flow analysis, design development and manufacturing process planning. In the USSR hydro-generation facilities form about 20% of the country's total installed capacity, generate 13% of electricity and make 30% of the total profit. Under these circumstances the task of improving the use of the existing facilities is a burning problem which is being solved in the following ways: enlargement of power plant and erection of additional units, raising head by building up the dam and/or excavation of the river bed, modernization of the generating equipment. Now 175 hydraulic turbines manufactured by LMZ 30 or more years ago and having total capacity of 9000 MW are subject to modernization. In five years they will be 230 with total capacity of 15000 MW and in ten years, 275 with 22000 MW capacity. The operating requirements to the turbines have changed as compared to those for the initial period of operation: duration of operation under maximum load and overload has increased, the number of transient operations has doubled or trebled, and environmental requirements became more restrictive. This required a new approach to developing hydraulic and mechanical designs.
Subject Headings: Turbines | Transient loads | Hydro power | Power plants | Hydraulic loads | Rehabilitation | Transient flow
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