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The use of airborne ultrasonic translators to
detect corona, tracking and arcing has gained in favour and
popularity over the past two or three years. Airborne
ultrasound generated by electric faults can be detected
through small openings of door seals on switchgear
cabinetry, through the outer shell of an oil filled
transformer, and in the switchyard emitting from bushings,
buss bars, and insulators. Using highly sensitive airborne
sensors these ultrasonic detectors can even isolate electric
faults on high tension transmission and distribution lines
at distances of over 150 feet. |
