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6 FAQs about [Generator fan cover cross section]
What are the different types of generator cooling blowers/fans?
The two main categories of generator cooling blowers/fans are axial flow blowers and radial flow fans. There is generally one blower or fan installed at each end of the generator rotor, although there are also single-blower/fan designs.
What kind of fan material is used in a generator?
The fan material is believed to be a stainless steel. The generator is combustion turbine/steam turbine driven and operates at 50 Hz. One unit was found to have a cracked fan hub. Another unit had a hub failure which caused collateral damage to the generator windings, diffuser case and end bell.
How many axial flow fans does a generator rotor have?
The generator rotor is equipped with two axial flow fans - one at the turbine end and one at the collector end. Each fan has 24 aluminum blades held in place by two 3/4” Grade 8 mounting bolts, secured with locking plates (see Figure 1 for typical design).
How should a generator rotor fan/blower be inspected?
Inspection programs and methods should be developed with consideration of many factors, including but not limited to, the following: Generator rotor fans/blowers should be visually and non-destructively examined on a periodic basis for evidence of cracking and pending failure.
What types of generator rotors are covered in the case studies?
However, the Case Studies do cover a wide range of generator rotor sizes, manufacturers, and cooling systems, as well as a variety of cooling fan/blower design types, materials, failure mechanisms, and root causes. The Case Studies form the basis for the best practices identified previously in this report.
What type of fan does GE use?
GE often uses a radial blower, squirrel cage type fan. The incidents observed involved non-fatal cracks in the shroud and/or blade to shroud attachments. Both incidents involve crack indications found during inspection. If the number of cracks is small, often they can be ground out and if needed, the fan can be weld repaired.