C3GH/C4GH — medium-voltage asynchronous machines for small hydropower plants, up to 6.6 kV, up to 3,400 kW

Description

The C3G–C4G series is listed on the manufacturer’s website in the section on asynchronous machines for use with Cross-Flow, Francis, Kaplan, Pelton and Turgo hydro-turbines. By purpose these are squirrel-cage asynchronous machines that operate in generator mode at small hydropower plants in parallel with the grid: the generator takes its magnetizing current from the network and needs no excitation system or voltage regulator, which simplifies the circuit and reduces the cost of small stations. Medium-voltage versions are designated C3GH and C4GH, low-voltage ones C3G and C4G. Parameters: power up to 3,400 kW, voltage up to 6600 V, frequency 50/60 Hz or variable-speed operation, 2–16 poles, frame sizes 280–710, welded steel housing, open cooling IC01 or IC06, degree of protection IP23 (up to IP44 with air filters), ambient temperature −20…+60 °C. Rolling bearings, sliding bearings from frame size 355. Standard IEC 60034. Options for hydro-units: a reinforced bearing assembly for axial and radial turbine loads, a special shaft end for direct connection to the turbine, an additional flywheel, a brake, horizontal or vertical shaft design, cooling air ducts, PT100 temperature sensors, heaters, an insulated bearing, and a lubrication system for sliding bearings. The item is suitable for small hydropower plants operating in parallel with the grid, in particular during refurbishment of stations with outdated asynchronous generators.

Technical specifications