Detection of partial discharge（PD） location is the crucial project of electrical equipment’s quality monitoring and transformer’s condition maintenance

good array location principle and the algorithm are the precondition for the guarantee of the location accuracy research.It regards the point of the intersection of two direction measuring lines and their projection as PD source in traditional algorithm for ultrasonic array location of PD.The theory of this method is simple and the calculation is not complicated.However

as the influences of ultrasonic signal’s refraction and reflection

and of variety of measurement errors

the two direction measuring lines are in different planes

approximately treated as the intersection

a lot of problems may be caused

such as bringing down the positioning accuracy.Furthermore

this could not get the unique solution which could not meet the actual engineering needs.Based on the midpoint of perpendicular public of direction measuring lines

in this paper

the author presents a new algorithm for ultrasonic array geometric location of PD.This method regards the public perpendicular midpoint of direction measuring lines as the location of PD source which could obtain the unique solution of the location result and improve the positioning accuracy.The experimental results verify the correctness and superiority of this proposed method.