Exploring Internal Arc Mechanisms in Transformers and Preventive Measures: A Real-World Case Analysis

This study presents a detailed investigation of an internal arc that occurred on a winter night at a temperature of approximately -۱۷ oC in a ۶۳۰ kVA auxiliary transformer. All conditions influencing the occurrence of the internal arc including insulation degradation, moisture ingress, transient overvoltage, connection issues, and etc., are thoroughly analyzed. Detailed examinations of operational data, oil condition assessments, and post-incident inspections enabled the identification of the contributing factors, thereby elucidating the root cause of the incident. This work not only deepens the understanding of internal arc mechanisms in small transformers but also offers practical recommendations and preventive measures aimed at mitigating the risk of similar events in the future.

کلیدواژه ها:

Internal arc ، transformer insulation failure ، sub-zero temperature ، partial discharge ، fault diagnosis