Shaft-extension tubular hydro-generator unit (S-type tubular unit)

The S-type (shaft-extension tubular) turbine-generator unit is a reaction-type hydro-power unit for low-head conditions. It is applicable for net head of 2.5-18 m, runner diameter D₁ ≤ 3 m, and unit rated output up to 5 MW. The generator is arranged outside the bulb housing (outside water passage); the main shaft extends outward and various speed-increasing gear units are optional. Featuring simple structure, low capital investment and favourable economy, the unit allows convenient installation, inspection and maintenance, well-suited for small-and-medium-size run-of-river hydropower stations with low head and large discharge. A complete matching parameter table is provided for model selection of turbine, generator, governor, excitation device, valves and oil-pressure equipment.

Category: Power generation equipment

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Working Brief

Working Principle

Water flows axially through the runner via S-shaped water passage and drives runner rotation. The main shaft extends out of the water passage and drives the synchronous generator either by direct coupling or through speed-increasing gearbox, converting hydraulic energy into mechanical energy then into electric energy. The whole generator is located in dry area outside flow passage for easy access during maintenance.

Technical Features

1.S-shaped flow-passage with externally-mounted generator; generator is not submerged inside bulb housing, enabling easy inspection & maintenance;
2.Operating net-head: 2.5-18 m, unit rated output ≤5 MW, runner diameter ≤3 m, optimized for small-medium hydropower plants;
3.Various speed-increasing gear units are available for rotational-speed matching with generator;
4.Low total investment for civil-work and equipment with good comprehensive economy;
5.Complete standardized scope of supply: turbine, synchronous generator, governor, excitation device, valves and oil-pressure unit. Complete-set delivery supported per parameter-sheet selection.

IEC / International Standard Term

S-type (Shaft-extension tubular) turbine-generator unitISO

S-shaped water passage

speed-increasing gear unit / gearbox

runner diameter

rated output

Keywords:

Shaft-extension tubular hydro-generator unit (S-type tubular unit) Power generation equipment

Shaft-extension tubular hydro-generator unit (S-type tubular unit)

Power generation equipmentMetallurgical and mining equipmentEnvironmental protection equipment

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