VP-X, hydrogen-cooled turbogenerator up to 900 MVA
The manufacturer's hydrogen-cooled turbogenerators cover the widest power range in its line, up to the 900 MVA class. They are installed at large steam turbine and combined cycle units. VP-X belongs to the newest generation of these machines, and an 870 MVA test unit showed an efficiency of 99 %.
- Rating
- up to the 900 MVA class (an 870 MVA unit has been developed)
- Voltage
- up to 25 kV
- Rotational speed
- 3000 / 3600 rpm
- Frequency
- 50 / 60 Hz
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
Hydrogen has high thermal conductivity and low density. Therefore ventilation losses are lower, and more power is obtained from the same dimensions. The frame is compact and the machine can be transported by rail, which simplifies delivery to site. The design includes gas coolers, a gas system with a manifold and fans on the rotor shaft. The fans drive hydrogen through the active steel, the windings and the gas coolers.
Two versions are produced. With indirect cooling of the stator winding the maximum delivered rating is 610 MVA, with direct hydrogen cooling up to 990 MVA. The voltage is up to 25 kV, the rotational speed 3000 or 3600 rpm for 50 and 60 Hz networks. The insulation has thermal class 155 (F), and the temperature rise is limited to class 130 (B), so the machine keeps a thermal margin. Efficiency reaches 99.0 %.
The VP-X series combines enhanced cooling, higher efficiency and smaller dimensions. The gas cooler with a modified fin shape is more compact, so the generator diameter is smaller. A fan with higher efficiency gives higher pressure and flow, and cooling of the stator and rotor is improved. Electromagnetic losses and forces are optimised by three-dimensional finite element calculation (3D FEM). The VP-X test unit rated 870 MVA with a power factor of 0.90 at 3600 rpm and 60 Hz showed an efficiency of 99 %. According to the company, as of December 8, 2014 this is the world level for machines of this class. The VP-X generator received the Good Design Award 2014.
VP-X technologies are also used in the modernisation of existing machines. Modernisation includes new stator insulation, improved rotor ventilation, a higher-efficiency fan, a non-magnetic partition and bearings with direct lubrication. As of March 2017 the manufacturer had delivered 731 hydrogen-cooled machines.
For operation, online partial discharge monitoring, remote monitoring with data analysis and the GenSPIDER robotic inspection are offered. From April 1, 2024 the generator business was transferred to a separate group company, which now handles supply and service of new machines.
Technical specifications
| Rating | up to the 900 MVA class (an 870 MVA unit has been developed) |
|---|---|
| Voltage | up to 25 kV |
| Rotational speed | 3000 / 3600 rpm |
| Frequency | 50 / 60 Hz |
| Cooling | hydrogen (indirect and direct) |
| Efficiency | up to 99.0 % |
| Insulation class | 155 (F), temperature rise to class 130 (B) |
| Power factor (870 MVA unit) | 0.90 |
| Delivered | 731 machines (as of March 2017) |
Request a price and lead time
VP-X, hydrogen-cooled turbogenerator up to 900 MVA. 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 40 |
| 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 rating do hydrogen-cooled generators have?
The line covers machines up to the 900 MVA class. The maximum delivered rating is 610 MVA for the version with indirect stator cooling and up to 990 MVA with direct hydrogen cooling.
What voltage and frequency are the generators made for?
Voltage up to 25 kV, rotational speed 3000 or 3600 rpm for 50 and 60 Hz networks. Insulation of class 155 (F) with temperature rise to class 130 (B).
Can VP-X technologies be applied to an existing generator?
Yes, modernisation includes new stator insulation, improved rotor ventilation, a new fan, a non-magnetic partition and bearings with direct lubrication. As of March 2017, 731 hydrogen-cooled machines had been delivered.
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