Bonneville Power Administration Transformer Short Circuit Test Results - Comparison of Winding Inspection With Diagnostic Methods

This paper summarizes Bonneville Power Administration's transformer short circuit test experience of three-phase units rated 115-kv Delta to 12.47-kv Wye; reviews BPA's diagnostic and low voltage impulse test results, and correlates them with factory inspection of damaged units. Special emphasis is on the low voltage impulse method of evaluating transformer damage.