Copper is a traditional material for hollow conductors used in generator stator water cooling. However, stainless steel is a promising and proven alternative for use as hollow conductor material. In 30 years of industry experience, no failures were encountered related to cooling water chemistry with this material. This paper describes the history, electrical and mechanical considerations, water chemistry and materials behavior, and experience with stainless steel hollow conductors. Recommendations are provided on use of high purity water with no restriction on oxygen content.

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