Diagnostics of a ladle furnace transformer after damage repair

Abstract

The paper presents results of diagnostic tests of a ladle furnace transformer conducted after damage repair, before putting the ladle to operation. In the tests, the waveforms of voltages and currents were recorded digitally on the primary and secondary side of the transformer in no-load as well as in under-load state. Additional temperature measurements of the transformer casing during its operation, conducted with an infrared camera, are also presented. The recorded data were numerically processed. The results made it possible to assess condition of the transformer components (core, windings and casing), indicate hazards and formulate operation recommendations