Review on Failure of Electrical Connection Components of Transformer Bushing

In the actual working process, the contact resistance of transformer bushing electrical connection parts increases due to temperature changes, vibration excitation, and other factors, thereby causing the failure of the connection parts. Therefore, ensuring the normal operation of the casing electrical connection parts to realize the stability and reliability of the DC transmission system. In this review, we summarize the previous studies conducted in this field in recent years and expound on the current status of the research conducted on the contact resistance of bushing electrical connection components, considering the mechanism of the electrical contact degradation of transformer bushing electrical connection components, main factors influencing the connection failure, experimental and simulation methods, and future outlook. Additionally, we discussed the typical issues faced in this field to provide new research directions, along with useful design insights for engineers.