Micromachined Ultrasound Transducers for Imaging of Underground Power Cables

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Power distribution failure is one of the key factors of electrical power interruption and effective preventive maintenance can significantly increase system reliability. Among the distribution failures, one of the major causes is water treeing in the Cross-Linked Polyethylene (XLPE) insulation of underground power cables. Water trees are regarded as being micro-fisures around water droplets within the XLPE insulation and their chemical composition varies depending on the type of soil the underground cable is buried in. What is important to note is that the composition of the water tree is different from the insulation and as such causes a contrast that can permit the detection and imaging of these faults, especially when ultrasound is used as the non destructive testing technique.