Load and torque: what is the infrared connection?

Garry B. Desroches

doi:10.1117/12.459585

15 March 2002 Load and torque: what is the infrared connection?

Garry B. Desroches

Proceedings Volume 4710, Thermosense XXIV; (2002) https://doi.org/10.1117/12.459585
Event: AeroSense 2002, 2002, Orlando, FL, United States

Abstract

To see the spark of a short circuit in an electrical component is a human ability. To detect the hot spot in a faulty electrical connection long before the component reaches a failure state is an ability which infrared thermography is noted for throughout the inspection community. Over the years, the inspection industry has developed various guidelines for different fault categories as it relates to measured surface temperatures. These temperature categories indicate the electrical connection's severity and in turn equate to a repair schedule. Typically during an electrical thermographic inspection the component's phase loading should be obtained by an electrician. However, quite often this is not achievable. In the absence of phase loading measurements, the thermographer must diagnose thermal patterns to accurately identify the fault type, i.e. loose, overload, etc.. More times than not, this predictive maintenance tool detects loose connections. Unfortunately, the phase connection's torque value is not obtainable during an infrared inspection to see how loose or tight the connection really is. Therefore, to measure the phase loading is only one aspect. Knowing the connections' torque value is another. This paper is intended to reveal the infrared relationship between variable phase loading, variable lug torque and the associated surface temperatures.

Citation Download Citation

Garry B. Desroches "Load and torque: what is the infrared connection?", Proc. SPIE 4710, Thermosense XXIV, (15 March 2002); https://doi.org/10.1117/12.459585

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