Hydrogenerators 0.5–70 MVA for hydropower plants with Kaplan, Francis and Pelton turbines

Description

Hydrogenerators are synchronous generators for run-of-river and diversion hydropower plants, small hydro stations and pumped-storage power plants. The company has produced hydrogenerators for more than 100 years: the first machine was delivered in 1889, and about 200 of the company hydrogenerators are now in operation worldwide. The current programme covers powers from 500 kVA to 50 MVA for machines with a non-salient-pole rotor and from 500 kVA to 70 MVA for salient-pole machines (the product description gives the range 1–50 MVA), voltage 0.4–15 kV, frequency 50/60 Hz and from 4 to 40 poles. Generators are made in horizontal and vertical versions, and also in a capsule (bulb) version for cases where a conventional layout is not suitable. They are combined with Kaplan, Francis, Pelton and other turbine types; single- and double-sided shaft outlets, a flanged shaft and a flywheel are possible. Cooling is water or air; bearings are rolling or sliding, with PTFE or Babbitt liners. The hydraulic axial thrust of the turbine is taken by bearings of increased load capacity. Smooth operation, precise voltage regulation, the ability to supply weak and isolated networks and stable operation in island mode are ensured by the choice of flywheel masses and, if necessary, an additional flywheel. Particular attention is paid to strength during load rejection and disconnection from the network, when the unit can accelerate to a runaway speed 2.5–3 times the rated speed for a long time. Static and brushless excitation systems are supplied, and the scope of supply may include an oil system, hydrostatic rotor lifting, braking equipment, an internal fire-extinguishing system, dust extraction from brakes and brushes, a static exciter and AVR. For pumped-storage plants the company additionally produces asynchronous motors with squirrel-cage and wound rotors of 0.5–15 MW for driving pumps. An example of supply: three generators for a 20 MW run-of-river hydropower plant at Maidolong (Philippines), which passed factory tests in Tapiószele.

Technical specifications