Hydrogen-cooled turbogenerators up to 740 MVA, up to 23 kV
Hydrogen-cooled turbogenerators of the manufacturer rated up to 740 MVA at 50 Hz and up to 700 MVA at 60 Hz, with rated voltage up to 23 kV. They are installed on high-power steam and gas turbine units that need high efficiency and long service life. The generators work with gas and steam turbines in single-shaft and multi-shaft configurations.
- Rating
- up to 740 MVA (50 Hz); up to 700 MVA (60 Hz)
- Speed
- 3000 / 3600 rpm
- Rated voltage
- up to 23 kV
- Power factor
- 0.8–0.9
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
Hydrogen as a cooling medium reduces friction and ventilation losses, which raises the output and efficiency of the machine. The generators are built in two variants, with and without direct water cooling of the stator winding, and the model is selected to match the turbine requirements. At 50 Hz the machine rotates at 3000 rpm, at 60 Hz at 3600 rpm. The cooling method is IC 8 (H1) W7, hydrogen pressure is 4–7 bar and the power factor is 0.8–0.9. Insulation is class F, the degree of protection is IP55 according to IEC 60034-5, and the mounting arrangements are IM7305, IM7306, IM1105 and IM1106.
Working with hydrogen requires dedicated auxiliary systems, and the generator is supplied together with them. They prepare and circulate the water and hydrogen that cool the machine and supply oil to the shaft seals. The gas system monitors the cooling medium in all modes, maintains the required hydrogen pressure and purges and fills the casing with hydrogen or air through inert CO2 gas. The shaft seals are oil seals, with oil flowing into the gap between the shaft and the sealing rings. The seal oil unit supplies it at the required temperature, pressure and cleanliness.
The design complies with the PED directive for pressure equipment and with ATEX, because the machine operates in the presence of hydrogen. During stacking the stator core is periodically pressed and finally consolidated at the end, so that individual laminations do not loosen in service. A large generator needs fast excitation, so a static system is used here that quickly adjusts the magnetic flux in the gap to the load. It keeps operation in the grid stable and the generator voltage constant at no load and during plant servicing.
The design has proved robust and repairable in service, and the technology is developed by the company's own R&D. Design work uses three-dimensional finite element analysis of mechanics, electromagnetic processes and ventilation. Each generator is adapted to the customer's specification and the requirements of the particular project. Installation is possible indoors or outdoors, with soundproof walls or enclosures. Since 1950 more than 170 such machines with a total rating above 30 GVA have been ordered, of which more than 38 are for open-cycle and combined-cycle gas turbines.
Technical specifications
| Rating | up to 740 MVA (50 Hz); up to 700 MVA (60 Hz) |
|---|---|
| Speed | 3000 / 3600 rpm |
| Rated voltage | up to 23 kV |
| Power factor | 0.8–0.9 |
| Cooling | IC 8 (H1) W7, hydrogen 4–7 bar |
| Degree of protection | IP55 (IEC 60034-5) |
| Mounting arrangement | IM7305, IM7306, IM1105, IM1106 |
| Excitation | static |
| Insulation | class F |
| Compliance | PED, ATEX |
| Track record | more than 170 machines since 1950 (174), over 30 GVA |
Request a price and lead time
Hydrogen-cooled turbogenerators up to 740 MVA, up to 23 kV. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Customs codes
| UKTZED (Ukraine) | 8501 64 00 00 |
|---|---|
| HS, 6 digits | 8501 64 |
| CN (EU) | 8501 64 00 |
| HTSUS (USA) | 8501 64 00 60 |
| China customs tariff | 8501 64 10 00 8501 64 20 00 8501 64 30 00 |
Codes are for reference: the final code is determined at declaration for the specific model.
Questions and answers
What power and voltage do the hydrogen-cooled turbogenerators have?
Up to 740 MVA at 50 Hz and up to 700 MVA at 60 Hz, with rated voltage up to 23 kV. The power factor is 0.8–0.9.
At what pressure does the hydrogen operate in the generator casing?
Hydrogen pressure is 4–7 bar and the cooling method is IC 8 (H1) W7. The gas system maintains the pressure in all modes and performs gas replacement through CO2.
What standards does the hydrogen-cooled generator meet?
The generators comply with the PED and ATEX directives. The degree of protection is IP55 according to IEC 60034-5, and insulation is class F.
Similar equipment from other manufacturers
