| 1. |
- Hjortstam, Olof, 1967, et al.
(författare)
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Physics-Informed Neural Networks for Studying Charge Dynamics in Air
- 2023
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Ingår i: Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP. - 0084-9162.
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Konferensbidrag (refereegranskat)abstract
- To establish a theoretical background for designing high voltage gas insulated systems, it is important to understand the charge dynamics under high electrical stress in air and other gases. Models used today for describing discharges and charge transport in gases related to discharges are comprised of partial different equations that are typically solved by numerical methods such as the finite element method (FEM). Such simulations are often tedious and have several shortcomings such as convergence problems, low accuracy due to numerical diffusion, etc. Recently, a new method called Physics-Informed Neural Networks (PINN) has been proposed which uses differential equations as constraints for training neural networks in such a way that a proper approximation to the solutions can be found. In the present work we explore how PINN can be used to solve some differential equations that are critical to studies of discharges and charge dynamics in gases. One very encouraging finding is that PINN solutions for charge density distributions with steep gradients do not show any numerical diffusion and instabilities that is in strong contrast to solutions with FEM.
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| 2. |
- Svensson, Daniel, et al.
(författare)
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Effect of Humidity on Charge Accumulation on Polymer-Air Interfaces under DC Stress
- 2022
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Ingår i: ICD 2022 - IEEE 2022 4th International Conference on Dielectrics, Proceedings. ; , s. 498-501
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Konferensbidrag (refereegranskat)abstract
- Accumulation of charge on polymer-air interfaces stressed with DC voltage has been studied under variable relative humidity (RH). In the experiments, a flat polymeric sample was placed on a grounded copper plate and its open surface was charged by applying a DC voltage to a rod electrode positioned above its center. The charging took place inside a sealed box where relative humidity was fixed by inserting various saturated salt solutions at room temperature. During charging, surface potential distributions were measured at 15 min intervals using a capacitive probe. It was found that the charging became significant at 40% RH for positive polarity and at 51% RH for negative polarity. Above these values, the initial charging rate increased exponentially with relative humidity, and it was substantially greater for positive polarity.
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