Scribd is the world's largest social reading and publishing site. Transformer Oil Test Report [od4po0x61vlp]. Transformer oil analysis provides a highly accurate indication of the internal condition of a transformer. Effects of transformer aging, including the condition of paper insulation – the primary indicator of potential transformer failure. Summary. Transformer Oil Testing Methods are key part of any maintenance program. CUSTOMER ID #: 02688.00 DATE PRINTED: 03/24/04 REF #: 001 CUSTOMER'S UNIT #: B1137A2 UNIT LOCATION: SUB W Transformer Oil Test Report - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Diagnostic tests offer insights into: Abnormal electrical or thermal activity. Search Search An annual DGA is the most important test for liquid insulation. Analysis of gases in the oil can indicate insulation overheating/overloading, liquid overheating, partial discharge (corona), or arcing in the transformer.