GE Renewable Energy’s Grid Solutions Services team has used digital X-ray technology, guided by the same principle utilized in the healthcare industry, to complement the preventive maintenance in Petrobras’ gas insulated substation, in the Abreu e Lima Refinery RNEST in state of Pernambuco in Brazil. Performed by GE in Latin America for the first time, the inspection strategy designed and implemented at RNEST included several complementary inspection methodologies that eliminate the necessity of opening the equipment to assess the condition of the high voltage circuit breakers. GE’s solution has enabled reduction of equipment downtime for preventive maintenance by up to 75%, minimizing impact on the operations while optimizing risk management through assertive and efficient asset assessment. In operation for almost a decade, the RNEST 145 kV GIS substation has 15 bays. All equipment underwent preventive maintenance with non-intrusive inspection methodologies, leveraging GE's digital X-ray inspection technology that was applied to evaluate the busbar coupling bay breaker. This innovative inspection method measures possible state variations in the asset, such as detrition of the active part, internal damage, and incipient failures. Based on the reports, GE engineers assessed the condition of the GIS equipment and tracked the substation components in need of maintenance, enabling a condition-based maintenance approach and greater precision repairment. The overall scope of the inspection was made through dynamic contact resistance measurement, vibration analysis, partial discharge measurement and digital X-ray inspection. GE's Grid Solutions team analyzed data collected to recommend only essential corrective maintenance.