McNary Powerhouse Generating Unit 14 Stator Core and Winding Replacement

by Chris Gantenbein, US Army Corp of Engineers, Portland, OR, USA,

Document Type: Proceeding Paper

Part of: Water Power '87


The powerhouse contains 14 main generating Kaplan-blade units, each rated at 73,684 kVA at 0. 95 power factor. In early 1985 the decision to rewind and uprate Unit 14 was being finalized. During a visual inspection of the unit stator from the back side, excessive waviness of the lamination iron was evident. A decision to not only uprate with a stator rewind but to also replace the stator core was made by the Walla Walla District and the Army Corps of Engineers Hydroelectric Design Center located in Portland, Oregon. This paper presents the design considerations which affected this work, the unexpected existing core asbestos removal problems which were encountered, the preparation of plans and specifications which resulted in contract award in August 1986 and the design discussions and decisions between the Army Corps of Engineers and the contractor. Actual onsite construction will not begin prior to March 1987. It is likely that core replacements will become more common in the hydroelectric generation field; this paper is presented to show how one design office approached their first recording project.

Subject Headings: Power plants | Hydro power | Electrical equipment | Electric power | Asbestos | Hydraulic design | Federal government | Oregon | United States

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