Transformers play a critical role in ensuring uninterrupted power for various operations, making their reliability more important than ever. Recent changes to essential guidelines, particularly NFPA 70E and NFPA 70B, emphasize the need for a meticulous approach to safety and maintenance. Bob Rasor and Jon Bucciarelli from SDMyers delve into the crucial aspect of visual inspections for transformer components and the impact of NFPA 70B standards on those responsible for managing these invaluable assets.

NFPA 70B now mandates a combination of visual inspections and regular dielectric liquid and electrical testing to enhance transformer safety and reliability. These visual inspections, which include components such as bushings, radiators, tank conditions, gauges, and other accessories, offer a non-intrusive means to assess the comprehensive reliability condition of transformers.

In this comprehensive program, visual inspections of bushings can be performed energized, aided by techniques like infrared scanning and ultrasound detection. The article outlines five approaches to assessing bushing status, providing insight into potential issues without the need for an outage.

Furthermore, the article explores the significance of visual inspections for other visible transformer components, aligning them with dielectric liquid sampling to ensure a holistic maintenance approach. Liquid levels, leaks, and overheating are highlighted, emphasizing the importance of these inspections in maximizing reliability and safety.

To learn more about transformer reliability through visual inspections read the full article.