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Case study: Identifying aging and installation issues in an HV bushing

Case study: Identifying aging and installation issues in an HV bushing

The subject 69 kV bushings are installed on a 10 MVA, 69/13.09 kV Dyn1 two-winding transformer. After completing on-load tap changer (OLTC) maintenance on this 1969-vintage transformer, the utility owner followed with electrical tests.

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