When conducting an outdoor thermography inspection of a substation on a bright sunny day, the technician notes that all the ceramic insulators on the east side appear extremely hot. What must the technician consider?
Answers
ACeramic inherently generates heat on the east side due to magnetic fields
BThe east side of a substation always carries more current
CThe emissivity of ceramic changes depending on the time of day
DSolar loading (sunlight) is heating the components, masking or mimicking electrical faults
Correct answer: D — Solar loading (sunlight) is heating the components, masking or mimicking electrical faults
Solar loading is a major factor in outdoor thermography. Sun shining on equipment heats it up, which can create false hotspots or hide true electrical faults.
MIFOTRA exam practicealigned to CompTIA (General IT) / BICSI·3 marks·Medium