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Project: T183700 #3277

Infrared (IR) inspections are techniques used to identify issues in line components and verify the overall electrical integrity of transmission lines. IR inspections are conducted on all line components, such as the line conductor, line hardware, shield wire/OPGW, insulators, splicers, spacers, dampers, bonding, and grounding. This report provides a guide for the effective use and application of IR technology for transmission line inspection, covering hardware selection, operator qualifications, inspection conditions, and frequency, inspection techniques. It also explores the effectiveness of IR on the various line components, thermal reporting, classification of anomalies, and the benefits of IR inspection.

This report documents the benefits and drawbacks of each IR test method – helicopter, unmanned aerial vehicle (UAV), and ground patrol – and provides context for IR inspections in relation to the overall transmission line inspection program, including corona, visual inspections, vegetation patrols, LiDAR surveys, and comprehensive “single-pass” solutions.


Infrared technology, transmission line inspection, transmission line components, anomaly identification, equipment settings