OFIL SYSTEMS LTD. is an industry leader in corona detection cameras, Ofil’s products are used globally by utilities, railroad companies, etc. Capable of Manufacturing both indoor and outdoor solutions and Ofil’s product line includes handheld, truck mounted, and aerial devices. What is Corona? Ultraviolet light triggered by partial discharge, which causes serious damage to insulation which is often a result of: poor design, improper installation, sharp edges, etc. Constant partial discharge damages electrical components and leads to failure.