Application Research of the Sparse Representation of Eigenvector on the PD Positioning in the Transformer Oil

Table 1

The location results of the circular ultrasonic array.

Group	The position of the PD source/cm	The position of the array sensor/cm	Theoretical angle/(°)	Direction angle/(°)	The result of the three-array cross positioning; /cm	The error/cm
1						2.9
		2								3.1
				3										3.3
4												3.0
		5								3.1