Transformer bushing partial discharge three-dimensional positioning method and system based on planar UHF sensor

Abstract

The invention discloses a transformer bushing partial discharge three-dimensional positioning system and method based on planar UHF sensors, the system comprises a planar UHF sensor array, an electromagnetic wave signal preprocessing module and a partial discharge three-dimensional positioning module, and the method comprises the steps: firstly, placing four UHF sensors on a horizontal plane around a bushing partial discharge source to collect electromagnetic wave signals radiated by a transformer bushing PD source; performing energy conversion on the four groups of electromagnetic wave signals to obtain an energy accumulation curve, and obtaining the time difference of the four groups of electromagnetic wave signals through an energy correlation search method; and finally, constructing a hyperboloid nonlinear equation set based on the coordinate information of the four UHF sensors and the time difference, and obtaining the three-dimensional coordinates of the PD source of the transformer bushing through a successive approximation method and a grid search method. Compared with the prior art, the method is simple and convenient, and the three-dimensional positioning result is accurate and reliable.

Description

technical field [0001] The invention belongs to the technical field of partial discharge monitoring of power transformers, and in particular relates to a three-dimensional positioning method and system for partial discharge of transformer bushings based on a planar UHF sensor. Background technique [0002] At present, the transformer bushing partial discharge detection and localization method based on the planar layout UHF antenna array has been applied, but the positioning distance error is too large, and no effective and accurate positioning method is provided. The UHF antenna array is in the same plane. When 3D partial discharge (PD) source localization is performed, there will be a large error in the z-coordinate value of the localization result. Although the PD source localization data set screening method based on singular value removal can Improve the positioning accuracy, but this method requires a large amount of PD source sample data, requires a lot of calculations...

AI Technical Summary

Problems solved by technology

The UHF antenna arrays are in the same plane. When performing three-dimensional partial discharge (Partial Discharge, PD) source location, there will be a large error in the z coordinate value of the location result. Although the PD source location data set screening method based on singular value elimination can Improve the positioning accuracy, but this method requires a large amount of PD source sample data, requires a lot of calculations, and the steps are complicated. Therefore, it is necessary to have accurate positioning of the z coordinate and more accurate PD source x, The problem of y coordinate positioning needs to be solved

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