What is the role of furfural in transformer oil for power transformers?

The role of furfural in transformer oil for power transformers is primarily as a diagnostic tool. Furfural is a byproduct of cellulose degradation and its presence in transformer oil indicates the thermal degradation of insulating materials. Monitoring furfural levels helps assess the condition of the transformer insulation system, allowing for timely maintenance and preventing potential failures. Thus, furfural serves as an important indicator of transformer health.