Hydrogen- and water-cooled turbogenerators for large power units

Description

For power units whose capacity exceeds the range of air-cooled generators (up to 300 MVA), the manufacturer produces hydrogen-cooled turbogenerators. The type designation in the manufacturer’s range follows the scheme: GT — turbogenerator (synchronous machine), then the cooling medium (L — air, H — hydrogen), the rotor cooling method (R — direct radial, D — direct axial) and the stator cooling method (I — indirect, D — direct gas-hydrogen, F — liquid, i.e. water). Thus the coding covers machines with indirect hydrogen stator cooling, with direct hydrogen cooling, and also generators with a water-cooled stator winding. The generators are supplied as part of turbine units with steam turbines; the largest machines in the reference list are a 670 MVA generator for Noshiro No. 1 (600 MW turbine, Tohoku Electric Power) and a 420 MVA generator for Miyazu No. 2 (375 MW, Kansai Electric Power), i.e. above the limit of the air-cooled series; the cooling type of the individual machines in the reference list is not stated. The rotational speed is 3000 rpm for 50 Hz networks and 3600 rpm for 60 Hz networks. The manufacturer has produced turbogenerators since 1959 and carries out the full cycle of power plant work, including generator service through a subsidiary company. Detailed rated data are not given on the website and are determined by the unit project; the generators are an analog of hydrogen- and hydrogen-water-cooled turbogenerators for large thermal power plants.

Technical specifications