Thermal Imaging for Rapid Noninvasive On-site Insulation Diagnostics

High voltage electrical failures are dangerous and costly events in any type of power system. The troubleshooting and diagnostic time required to identify and locate these failures can be significant. Partial discharge is one of the early warning signs for electrical degradation. In insulation systems, partial discharge typically occurs in voids located within the dielectric, at material interfaces, or along energized electrode surfaces. Effective methods for finding this failure precursor enabling circumvention of future catastrophic events are highly valuable as successful detection can improve safety, reduce service interruptions, and result in significant financial savings. The presented method was successful in localizing the excess stress without direct line of sight, a clear advantage over night vision and corona cameras. The investigated methodology provides the ability for any user in varying on-site conditions to quickly and noninvasively diagnose the health of a component or device while maintaining safe clearance from energized parts.