Induction Generator For Outdoor Solar Application

Parameters

Specifications

Voltage

575 V

Frequency

50 to 60 Hz

Phase and wiring configuration

3 Phase Delta

Rated power

26 to 27 kW

RPM

> 1800 during normal power generating

Overspeed

Overspeed capability to 3600 RPM on intermittent basis; up to 50 overspeed occurrences during the life of the generator

Maximum power service factor

>=1.15 at 40C

>=1.00 at 50C

Insulation

F class or better (H class preferred)

Weight

<= 460 lb

Frame

IEC 180 frame or equivalent. D-type 350 mm diameter flange has four bolts holes equally spaced on a 300 mm diameter circle

Housing

TEFC (Totally Enclosed Fan Cooled) design or equivalent suitable for long-term outdoor exposure in high solar insulation, desert type sites

Protection

IP 55 or better (withstand water from hose at any angle)

Front Bearing

Cylindrical roller bearing for high radial loads

Bearing Loads

See Figure 1

Life

18k hours L10

Seal

Double Lip to prevent oil from leaking past shaft

Shaft end of generator will be exposed to oil splash

Maximum oil temperature of 90C

Seal Life

18k hours L10

Rotor Balance

50% of the NEMA rating

Start up Torque

TBD

Locked rotor current

550% to 750 % of Full Load Current

Power factor at the rated power

> 0.8

Power factor at � of the rated power

> 0.44

Efficiency at the rated power

>=94%

Efficiency at � of the rated power

>= 91%

Operating temperature at the rated power

-30 to +50 癈.

Exposed Surface Treatment

Outer surfaces shall be protected by finishes commensurate with the environment and life of the unit. White paint or other high solar reflectivity color should be used for the exterior coating.

Outer surfaces on the shaft end of the machine will be exposed to warm air at 60C.

Moisture Protection

Protection against condensation and high humidity shall consist of drain valves (or equivalent) in the lowest point of the units frame when rotated through 90 degrees

Rain

Withstand 50 mm per hour with a 65 km/h (40 mph) wind for a period of 15 minutes

Snow/Ice/Hail

Withstand 0.3 m of snow for 24 hours with a 250 Pa (4 psi) snow load or a 50 mm ice load.  When the above snow or ice melts, run-off water shall have no detrimental effect on the unit. The unit should also be able to withstand hail with the diameter of 20 mm or greater.  

Wind

Operation in winds up to 65 km/h (40 mph)

Sand/Dust

Withstand a dust concentration of 0.01 g/l (0.3 grams per cubic feet) blowing at a wind velocity of 32 km/h (20 mph) without degradation

Altitude

0 to 1800 m (6000 ft) unless otherwise specified by SES

Attitude

The units frame will rotate 90 degrees with respect to the earths surface as the dish tracks the sun