Analysis of Partial Discharge Acoustic Wave Propagation in a Model Transformer

Effect of sensor position on the measurement of acoustic wave produced by partial discharges

“…To obtain a better resolution of the propagation of acoustic waves in the selected media, a minimum of 6 elements per unit wavelength is necessary when using the Lagrange elements for maximum frequencies [ 2 , 34 ]. The formula for calculating the maximum mesh is given by the following relationship [ 2 , 35 , 36 ]: where h max is the maximum dimension of a mesh, λ min is the minimum wavelength calculated from the minimum speed and the maximum frequency, and N is the number of elements per wavelength. In this work, the maximum frequency is 100 kHz, and the minimum speed is that of the wave in oil which is 1400 m/s, for a number of elements of 6, we obtain a maximum length of 2.33 mm.…”

Partial discharge localisation methodology for power transformers based on improved acoustic propagation route search algorithm

“…In some previous studies, simple iteration methods or basic intelligent optimisation algorithms have been used to solve the TDOA equations [4,5,16]. Although their localisation results are not accurate enough, these imprecise PD localisation results can help establish an initial search scope.…”

FEM Simulation of PD Acoustic Signal Propagation in Transformers

“…created a simplified transformer model, researched on the PDs in the model, then verified the mathematical model with physical experiments. The analysis result was fine [1][2][3]. Based on previous studies, the partial differential equations describing wave propagation are solved by means of finite element method.…”