Superior Signal Company LLC
AccuTrak
®
VPX-WR
User’s Manual
© 2015
17
ELECTRICAL INSPECTION
ARCING
Arcing is a very catastrophic phenomenon that occurs in relays and contactors. Arcing
sounds like a constant buzzing similar to the sound of frying potatoes. To test suspected
equipment, use the plastic wave guide and cut it or make a new one with the length you
need and test around the contactors and relays.
CORONA
Corona is a form of plasma current flow that is found around higher voltages like
transmission lines. It is invisible in the visible spectrum, however under certain conditions
a bluish glow can be seen at dusk. Thermography can detect this phenomenon but when
it is coupled to ultrasonic inspection its presence will be confirmed and action must be
taken fast. The sound of corona is similar to arcing, but with popping sounds in the
spectrum.
CAUTION !
Observe ALL safety rules for the voltage you will be close to.
Make sure Arcing CANNOT take place from the parts you test to the VPX-WR, or to YOU.
