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Study of cross-shaped ultrasonic array sensor applied to partial discharge location in transformer oil
Jisheng Li1, Xiaohu Xin, Yongfen Luo
1School of Electrical Engineering, Xi'an Jiaotong University, Xi'an Shanxi 710049, China.
Abstract:
A conformal combined sensor is designed and it is used in Partial Discharge (PD) location experiments in transformer oil. The sensor includes a cross-shaped ultrasonic phased array of 13 elements and an ultra-high-frequency (UHF) electromagnetic rectangle array of 2 × 2 elements. Virtual expansion with high order cumulants, the ultrasonic array can achieve the effect of array with 61 elements. This greatly improves the aperture and direction sharpness of original array and reduces the cost of follow-up hardware. With the cross-shaped ultrasonic array, the results of PD location experiments are precise and the maximum error of the direction of arrival (DOA) is less than 5°.
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