Experimental Research on Visual UHF Positioning Technology of Space Discharge Sources Based on Electrical Transformer

Ultra high frequency(UHF) positioning of space discharge sources in substation is an important means to accurately detect hidden faults of power equipment. The detection efficiency and positioning accuracy of substation space discharge sources could be improved by realizing the visualization, which is of great significance for promoting the operation and maintenance level of power equipment. In this article, an ultra-wide bandwidth spiral UHF positioning sensor was developed. And a spatial grid search algorithm was proposed to realize the accurate position calculation of the discharge sources. On this basis, the distribution and accuracy of the positioning results of the Z-Array and Y-Array classical sensor layouts were simulated and analyzed. The results showed that the Z-Array layout had higher positioning accuracy and more large effective positioning area. Finally, an UHF visual positioning system was developed, which applied to the detection of ultra high voltage transformers and bushings. Furthermore, it was proved that the system had a good performance in the application.