14: Conductor termination with only corona discharges present due to protrusion. 13: Thermal image showing slight heat source. 12: UVc overlaid onto visible image showing two corona sources: dry band and discharge from a protrusion. The signals are electronically manipulated into a raster image and displayed to the operator (Left) Fig. Light from a source is collected by a lens, projected through a filter onto a detector that converts the light energy into electric signals. 9: Principles of ultrasound and camera detectors.Ī round dish focuses ultrasound radio waves onto an RF detector (microphone) that amplifies and presents any weak signal detected to the operator by means of sound produced by an earphone. energy in the electromagnetic spectrum) that can be detected and recorded by an inspection device. Both make use of the basic phenomenon that any defect will emit radiation (i.e. Generally speaking, modern inspection technology can be classified into two main groups: ultrasound radio telescopes and camera detectors. ![]() Given this, it is correct to state that the ideal inspection tool is one that integrates different types of sensors into a single instrument. Moreover, no diagnostic sensor will detect and locate all possible different faults that can appear on a line. Years of experience in line inspection have indicated that there is still no single technology that best meets every need. * Based on interviews with system operators across South Africa. 8: Combined ultraviolet, infrared and visible camera inspection. 1: Ultraviolet and infrared recoding of same phenomena show presence of corona but with no heat dissipation. ![]() Advertisement Typical Problems on Lines Fig.
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