Solving a Set of Spherical Equations for Localization of Partial Discharges by Acoustic Emission Method

Abstract

This article deals with the subject matter of improvement of the acoustic emission methods used for location of partial discharges, which may occur inside power transformer insulation systems. Analytical solutions of spherical equations for location of partial discharge generation using the acoustic method were shown in detail. Presented in the article method of solving the assumed equations is based on the analytical method and matrix notation. Theoretical considerations and later the measurement-based verication refer to the use of the triangulation method for location of the occurrence of partial discharges. The results of the scientic and research works that have been presented in this article are the next stage of research aimed at development of on-line diagnosis system for insulation systems of electrical equipment, allowing for detection, measurement and identication of forms and locations of partial discharges using the acoustic emission method.

Influence of Frequency and Distance on Acoustic Emission Velocity Propagating in Various Dielectrics

“…In the field of high-voltage power transformer diagnostics, there are various other existing methods to calculate their technical condition estimation, e.g., optical spectrophotometry [4][5][6], or UHV [7][8][9] methods. The advantage of non-invasive PD detection methods is their resistance to electromagnetic interference, which makes them appropriate for application under on-line operation [10][11][12].…”

“…Apart from the detection of the PD occurrence, its localization inside the device is crucial [11,13]. Knowing the speed of the waveform of AE is the key parameter in the application of methods for locating incomplete discharges.…”

Determination of Surface Erosion Degree inside Dielectric Void Subjected to Partial Discharges

“…Partial discharge exposure in gaseous voids within solid dielectrics leads to changes in surface conditions, such as roughness or morphology, as well as in physical properties, such as charge accumulation and transport, surface and bulk conductivity. Surface conductivity influences the decay of deposited charges and hence the long term inception conditions in a void [1][2][3][4][5][6][7][8][9][10][11][12][13].…”