A study on the influence of partial discharges on the performance of solid dielectrics

This paper presents the results of analysis of a solid dielectric’s influence on the phenomena associated with the signals emitted by surface partial discharges. Three types of electrode systems were tested, in which solid dielectrics made of pressboard, Teflon, and glass were used. The emission of such signals as radio waves in the Ultra high frequency (UHF) range and optical radiation was analyzed. The measurements were carried out in the insulation systems most commonly used in electrical power equipment, i.e., mineral oil and air. UHF and optical spectrophotometry methods were used to register the emitted signals. The obtained results indicate that the type of material from which the dielectric solid is made may have a potential impact on some ranges of emitted electromagnetic waves during the surface electrical discharges. The research topic undertaken is important in issues associated with high-voltage insulation systems and in particular with surface discharges, which are often the cause of their damage.

Download Full-text

Mathematical model of insulation breakdown prediction based on partial discharge characteristics

Omsk Scientific Bulletin ◽

10.25206/1813-8225-2021-175-46-49 ◽

2021 ◽

pp. 46-49

Author(s):

I. V. Komarov ◽

◽

D. A. Polyakov ◽

K. I. Nikitin ◽

V. Yu. Miroshnik ◽

...

Keyword(s):

Mathematical Model ◽

Least Squares Method ◽

Residual Life ◽

Partial Discharges ◽

Short Term ◽

Insulation Failure ◽

Insulation Thickness ◽

Solid Dielectrics ◽

Conducting Research ◽

Insulation Breakdown

The paper investigates the existing mathematical models of insulation destruction. It has been determined that most of the models for assessing the residual life of insulation are based on models of thermal and thermo-oxidative destruction of insulation materials. Currently, solid dielectrics are gaining popularity, including crosslinked polyethylene, PVC, ethylene-propylene rubber, and others. In such dielectrics, it is possible to estimate the residual life in the short term. This possibility and necessity is due to the possibility of growth of tree defects under the influence of partial discharges. The article describes the proposed mathematical model for assessing the residual resource of insulation by modeling the growth of a defect. To take into account the influence of random variables, the model uses the Weibull distribution. The model assumes the division of the insulation thickness into some areas, each of which is destroyed independently of the others. The destruction of these areas occurs when partial discharges occur with certain energy sufficient to destroy the material. Insulation failure is predicted using the least squares method. The results obtained can be useful in assessing the residual life of insulating materials and in conducting research in this area

Download Full-text

Numerical Simulation of Temperature and Pressure Changes due to Partial Discharges in Spherical Cavities Within Solid Dielectrics at Different Ageing Conditions

Energies ◽

10.3390/en12244771 ◽

2019 ◽

Vol 12 (24) ◽

pp. 4771 ◽

Cited By ~ 2

Author(s):

Johnatan M. Rodríguez-Serna ◽

Ricardo Albarracín-Sánchez

Keyword(s):

Dielectric Material ◽

Surface Condition ◽

Partial Discharges ◽

Cavity Surface ◽

Element Analysis ◽

Finite Element Analysis Simulation ◽

Insulation Systems ◽

Temperature And Pressure ◽

Solid Dielectrics ◽

Pressure Changes

Partial Discharges (PD) behavior during ageing of the insulation systems exhibits variations that depend on changes in gas filling characteristics and surface condition. In this article, numerical simulations of temperature and pressure behavior in an air-filled spherical cavity within a homogenous solid dielectric material due to PD activity are presented. An Analytical-Finite Element Analysis simulation approach was implemented in MATLAB and results exhibit reasonable agreement with experimental measurements reported by other authors. Simulation results allow concluding that pressure changes are directly related to variations in the PD behavior. In addition, affectations to cavity surface due to temperature increments can be discarded.

Download Full-text

Modeling and simulation of internal Partial Discharges in solid dielectrics under variable applied frequencies

2016 Eighteenth International Middle East Power Systems Conference (MEPCON) ◽

10.1109/mepcon.2016.7836959 ◽

2016 ◽

Cited By ~ 4

Author(s):

Tarek S. Negm ◽

Mostafa Refaey ◽

Ahmed A. Hossam-Eldin

Keyword(s):

Modeling And Simulation ◽

Partial Discharges ◽

Solid Dielectrics

Download Full-text

Foreign Inclusions, Enclosed Cavities, Partial Discharge Models and Discharge Energy: A Short Review Regarding Solid Dielectrics and Composite Insulating Systems

Engineering, Technology & Applied Science Research ◽

10.48084/etasr.2958 ◽

2019 ◽

Vol 9 (5) ◽

pp. 4659-4666 ◽

Cited By ~ 2

Author(s):

M. Danikas ◽

S. Morsalin

Keyword(s):

Partial Discharge ◽

Short Review ◽

Partial Discharges ◽

Discharge Energy ◽

Insulating Materials ◽

Discharge Parameters ◽

Solid Dielectrics ◽

The Relationship ◽

Inception Voltage

Partial discharges in cavities are one of the main reasons of breakdown of insulating materials and insulating systems in general. The present paper aims at commenting some aspects of the relation between partial discharges and insulation damage. Some basic models explaining the workings and impacts of discharges in cavities are discussed. Discussions about the possibility of damage in the presence of multiple cavities as well as of the risks of minute discharges and/or charging phenomena below the so-called inception voltage are conducted. It is remarked that the question of the relationship between discharge parameters and insulation damage is still an important one, especially for composite insulating systems.

Download Full-text