FAILURE ANALYSIS OF TRANSFORMER DURING SHORT-CIRCUIT TESTS WITH TYPICAL CASE STUDIES

摘要

This paper presented the results of investigation on the relationship between electrical, magnetic and electromechanical effects in transformer, with symmetrical and asymmetrical windings physical conditions, at the occurrence of short-circuit currents and their impact on the mechanical axial and radial forces. Transformer failure cannot be formulated until all the data is collected, the inspections are completed, the diagnostic tests are performed and the test results are analyzed and interpreted by knowledgeable engineers, in line with international practice (STL guidelines). It is concluded that short-circuit testing is a vital part of the design process and a crucial verification tool. Hence there is no alternative method to actual short-circuit type test, to verify the short-circuit withstand capability of the transformer.