Luo Yongfen, Li Yanming
(School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China)
Abstract:
According to the partial discharge location method based on UHF and ultrasonic phased
receiving arrays theory proposed by the authors, a phased receiving ultrasonic planar
array sensor which possesses 16¡Á16 elements is designed. With the aid of the phased array
theory, the characteristics of the plane sensor are studied. The performance of each
element measured in the laboratory is perfect within the frequency bandwidth of ultrasonic
that can be received from PD in transformer oil. Location tests are conducted where one or
two synchronous emitting piezoelectric ultrasonic sources in oil are simulated as PD
sources. The results show that the locations are precise using this phased ultrasonic
receiving array sensor, the system error is less than 2% near the positive normal, and
multiple locations can be determined in one measurement.
Keywords: partial discharge; phased receiving array; location method; piezoelectric
ultrasonic source