We are often asked at which voltage

We are often asked at which voltages and on what type of equipment is ultrasound most effective. Theanswer is not simple since it often depends on the individual asking the question. First of all,determining the definition of low, mid and high voltages is relative. Those in the power distribution arena will look at 12 kV as low voltage, those who work in a typical manufacturing plant will look on440 Volts as high voltage. The main electric problems detected ultrasonically are partial discharge, arcing, tracking and corona. Ultrasound detects the ionization of air, as it produces turbulence. This can be from Corona, Tracking or Arcing. Heat is produced when there is either Resistance due to corrosion or from Tracking and Arcing. Since Heat is produced by the flow of current through corrosion or resistance, you can have a “hot spot” detectable with IR, and have no Ultrasound because there would be no ionization.