Thermography depends on current with the power proportional to the square of the current times resistance (higher current leads to higher temperatures and also higher resistances lead to higher temperatures). Partial discharge, however, is a problem for thermal cameras. For example, loose and corroded connections creating higher resistance leading to higher temperatures, or unbalanced loads with temperature differences between phases, or a lower liquid level due to a transformer oil leak will be evident with proper use of thermography. What this means for electrical inspections is we’re looking for overheated electrical assets. Thermal cameras look at infrared energy emitted from target objects. Useful to screen for further visual inspection and offline tests Thermal Camera is not recommended for Partial Discharge inspections Quicker and less expensive than offline tests Online testing (test while equipment and cables are energized) These technologies do have some obvious common benefits as part of a predictive maintenance program: ![]() ![]() In a worst-case scenario, the outcome could even be injury or fatality. Apart from creating outages, halting production, and other day-to-day activity, necessitating crisis management, it could cause a reportable health and safety incident. Substation and other MV/HV electrical asset failure can be devastating. In this FAQ, we’ll compare the technologies plus offer some best practices and selection advice. One is a poor choice for partial discharge testing. ![]() Let’s compare tools for outdoor medium and high voltage online electrical inspections: IR Thermography, Ultrasonic (Acoustic), UHF (RF).
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