Abstract
A two-dimensional kinetic model has been used to parametric investigation of the spark-type partial discharge pulses inside the micro-cavities. The model is based on particle-in-cell methods with Monte Carlo Collision techniques for modeling of collisions. Secondary processes like photo-emission and cathode-emission are considered. The micro-cavity may be sandwiched between two metallic conductors or two dielectrics. The discharge within the micro-cavity is studied in conjunction with the external circuit. The model is used to successfully simulate the evolution of the discharge and yield useful information about the build-up of space charge within the micro-cavity and the consequent modification of the applied electric field. The phase-space scatter plots for electrons, positive, and negative ions are obtained in order to understand the manner in which discharge progresses over time. The rise-time and the magnitude of the discharge current pulse are obtained and are seen to be affected by micro-cavity dimensions, gas pressure within the micro-cavity, and the permittivity of surrounding dielectrics. The results have been compared with existing experimental, theoretical, and computational results, wherever possible. An attempt has been made to understand the nature of the variations in terms of the physical processes involved.
Highlights
Some of the principal factors that can influence partial discharges (PD’s) and other such discharges inside micro-cavities are the dimension of micro-cavity, the pressure of the gaseous environment and gas composition, the magnitude and frequency of the applied voltage, the electrode arrangement and geometry, and the properties, condition, and age of the insulation
The different character of the discharges affects in turn the response of conventional PD pulse detectors, which is dependent to the pulse shape and its rise-time [1,2,3]
These results show that for a kept fix each one of the above parameters, the detected PD pulse form, amplitude and rise-time can exhibit considerable variation due to possible changes in each every above-mentioned parameter
Summary
Some of the principal factors that can influence partial discharges (PD’s) and other such discharges inside micro-cavities are the dimension of micro-cavity, the pressure of the gaseous environment and gas composition, the magnitude and frequency of the applied voltage, the electrode arrangement and geometry, and the properties, condition, and age of the insulation. The effects of micro-cavity dimensions, gas pressure, and dielectric permittivity on the PD pulse features such as discharge current magnitude and its rise-time have been investigated.
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