With the new technologies applied in the Power Electrical System, we enable the shared use of the Ultraviolet Measurement Apparatus, for Corona Measurement (the corona effect is just one type of partial discharge characterized by its visibility when propagating in external mediums due to electric field - potential) in Transmission Lines, into the Assets of Hydropower Plants with rotating machinery from Small Hydropower Plants - SHPs, within Predictive Maintenance. The gain from this Predictive Maintenance brought evaluation benefits in the reception after treatment of generators related to Partial Discharge on the surface, particularly the part related to surface corona effect on rotating machinery. Measurements before and after surface treatment recovery, mainly in coil heads and other parts of the generating unit, show us the results more through frequency spectrum, ranges, and events/minutes measures, associated with a scale already worked for measurement points in Transmission Lines assets, values understood above 5000 events/minutes and mainly the region with the highest concentration of records signaling points to improve or redo specific treatment. It's worth mentioning here that it doesn’t substitute tests by offline and online partial discharge devices in peak measures (pC) or nano Coulomb (nC), but it brings the focus spectral sampling region that deserves more attention or reinforcement in treatment to mitigate corona effect, also can be used to evaluate generator cleanliness when intensities are recorded in predictive maintenance. The SBUV camera, Solar Blind filter, has higher sensitivity, compatible wavelength, bi-spectral, and a range from 240 nm to 280 nm (nanometers), which can bring gains in this technological application. The tool, when customized, provides risk assessment for each generator in trials and ensures an operational view of the Asset from the perspective of its health in this regard - Health Index. The new technology is already implemented and has been successfully used in our plant, in its punctual maintenance plan regarding measuring, evaluating own or third-party services, and determining the best time to act in new surface treatments or asset cleaning, mitigating the risk of early burnout due to this phenomenon. Direct gains in application come from the integration of Asset Management with Reliability-Centered Maintenance, optimizing the Maintenance Plan and the concepts of Engineering Applied to the company's Assets.