MKL / MKM — squirrel-cage induction generators (SCIG) for wind turbines up to 8 MW
MKL and MKM are squirrel-cage induction generators (SCIG) rated up to 8000 kW for geared wind turbines. They are connected to the grid directly or through a full frequency converter that controls speed and reactive power. The generators suit new wind turbines and machine replacement during wind farm refurbishment.
- Type
- squirrel-cage induction
- Power
- up to 8000 kW
- Voltage
- up to 1 kV
- Speed
- 0–1800 rpm (converter in the stator circuit)
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
The SCIG rotor has no winding and no slip rings. Such a generator has few wearing parts, maintenance is inexpensive, and the machine withstands severe conditions and operation over a wide speed range. Generator voltage is up to 1 kV, speed up to 1800 rpm. With a converter in the stator circuit the speed control range is 0–1800 rpm, and the generator delivers stable power to the grid under variable wind. The direct grid connection scheme needs no power electronics. In the full-converter scheme all generator power passes through the converter, but the turbine rotor speed is not tied to the grid frequency.
MKL is cooled by a built-in air-to-air heat exchanger, MKM has an air-to-water heat exchanger. The choice depends on how nacelle cooling is organized and whether the nacelle has a liquid circuit. In both cases the internal air circuit is closed, so the windings run cooler and the insulation lasts longer. Degree of protection up to IP54, insulation class F or H. Frame sizes per IEC 500–710, mounting arrangement IM B3, others on request. The generators are built to IEC 60034, on request to CSA C22.2 and UL 1004, in onshore and offshore versions, for hot and cold climates. They are fitted with temperature and vibration sensors and encoders.
A wind generator constantly takes variable mechanical loads from turbulence and rotor dynamics. Therefore the manufacturer fits reinforced bearing assemblies and dynamically balances rotors to ISO 21940-11, grade G2.5, designed for a service life of up to 30 years. Multilayer anticorrosion coatings are tested in salt spray to ISO 9227. The climate class of the design is H, and the electrical compartments have IP55–IP65 protection.
Mounting interfaces are made to industry standards, so the generator fits the nacelles of turbines from different makers. The manufacturer supplies the machine complete, or the stator or rotor separately when an existing generator must be repaired or upgraded. For wind farm refurbishment this is convenient, since the nacelle frame does not need rework for the new machine. A replacement request should state the connection scheme, voltage, speed, cooling type and interface dimensions of the existing generator.
Technical specifications
| Type | squirrel-cage induction |
|---|---|
| Power | up to 8000 kW |
| Voltage | up to 1 kV |
| Speed | 0–1800 rpm (converter in the stator circuit) |
| Schemes | direct grid connection or full converter |
| IEC frame size | 500–710 |
| Cooling | built-in air-to-air (MKL) or air-to-water (MKM) heat exchanger |
| Degree of protection | up to IP54 |
| Insulation | F or H |
| Mounting | IM B3 |
| Standards | IEC 60034; CSA C22.2 and UL 1004 on request |
Request a price and lead time
MKL / MKM — squirrel-cage induction generators (SCIG) for wind turbines up to 8 MW. 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 00 |
| China customs tariff | 8501 64 10 00 |
Codes are for reference: the final code is determined at declaration for the specific model.
Questions and answers
What are the parameters of the MKL and MKM generators?
Power up to 8000 kW, voltage up to 1 kV, speed up to 1800 rpm. With a converter in the stator circuit the speed control range is 0–1800 rpm.
Which connection schemes are used for a SCIG generator?
Directly to the grid, or through a full frequency converter that controls speed and reactive power.
What are the degree of protection and service life of the generators?
The generator has protection up to IP54, the electrical compartments IP55–IP65. Rotors are balanced to ISO 21940-11 grade G2.5, designed for a service life of up to 30 years.
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