Design Considerations for Radial Key Retrofitby Jan Seyler, Westinghouse Canada Inc, Burlington, Canada,
Abstract: A practise that is becoming more and more common is to retrofit hydro-electric generators with Radial Key Systems. There are significant design considerations that must be made to ensure that a radial key retrofit leads to trouble free operation of the generator. This paper discusses considerations related to stress, vibration and stability in the design of a radial key retrofit. A typical design is outlined along with a method of increasing stator radial stiffness without restraining stator frame thermal expansion.
Subject Headings: Radiation | Rehabilitation | Vibration | Hydro power | Stiffening | Frames | Thermal properties | Hydraulics
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