Research on Key Technologies of Sonic Detection of AC/DC Cables Based on Beam Forming

Cables will inevitably deteriorate during long-term operation, resulting in a reduction in electrical insulation strength or even failure. Sonic detection is easy to operate and the results are intuitive, which is one of the most commonly used methods. This article first briefly analyzes the principle and key elements of sonic detection; then, the array formation of beam forming technology, main testing methods and testing principles are introduced, and mathematical derivation is carried out. At the same time, a set of acoustic imaging system based on beam forming is designed. Finally, the application of cable partial discharge detection based on this technology is introduced. Case analysis shows that this technology is fast and effective.