Most electrical cabinets are not hermetically sealed. Scan your ultrasound detector around the panel sides and vent holes to detect discharges like arcing, tracking, and corona.
Not all electrical discharge faults produce heat. Use ultrasound to hear what your infrared camera cannot see.
Electrical discharge activity is amplified by high humidity. When performing ultrasonic scans at substations make note of the date and weather conditions.
Ultrasound travels directionally through air compared with audible sound. When scanning from a distance therefore, it is important to inspect electrical systems from all sides.
Corona discharge produces no heat on electrical systems below 240 kV so don’t rely entirely on infrared to find problems.
