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Simulation of electrostatic field across HVDC composite insulators

Nandi, S and Subba Reddy, B (2020) Simulation of electrostatic field across HVDC composite insulators. In: 21st International Symposium on High Voltage Engineering, 26 - 30 August 2019, Budapest; Hungary, pp. 1453-1466.

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Official URL: https://doi.org/10.1007/978-3-030-31680-8_138


Electric field computation under unipolar voltage is different from that under power frequency. The general boundary condition for dielectric interfaces includes equality of the tangential component of the electric field and the difference of the normal component of electrical flux density that is equal to the surface charge accumulated along the interface. The surface charge is the free charge seen due to a difference in the volume conductivities of two dielectrics or due to the current flowing along the interface. The phenomena give rise to a time varying boundary (interface) condition which can be expressed as the time derivative of the interfacial charge. So, the electrostatic field plot is a time dependent and changes with the surface charge accumulation. Initial field distribution in any insulator is capacitive governed mainly by the permitivities but later it changes to resistive. In the present investigation some simulation results are presented for computing electric field under different polluted conditions considering the effect of dry bands. The effect of uniform and nonuniform pollution along the insulator interface is being studied under the effect of unipolar voltage. The effect of dry band and the presence of uneven wetting are also being investigated. For the simulation we have considered the generalized boundary condition which includes the time-dependent growth of the interfacial charges which causes the field to change from capacitive to resistive. Work is in progress by using numerical method by solving the Laplace equation is FEM, COMSOL Multiphysics is used for the simulation. The motive behind this study is mainly to establish better knowledge of electrostatic field distribution across HVDC Composite insulators under various conditions of pollution and wetting, also to understanding the pollution flashover phenomena and dryband arcing under unipolar voltage application. © Springer Nature Switzerland AG 2020.

Item Type: Conference Paper
Publication: Lecture Notes in Electrical Engineering
Publisher: Springer
Additional Information: Copyright of this article belongs to Springer
Keywords: Boundary conditions; Dielectric materials; Electric fields; HVDC power transmission; Insulating materials; Numerical methods; Pollution; Surface charge; Wetting, Composite insulators; Electric field computation; General boundary conditions; Generalized boundary conditions; Non-uniform pollutions; Pollution flashovers; Surface charge accumulations; Tangential components, Insulator contamination
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 07 Apr 2021 11:19
Last Modified: 07 Apr 2021 11:19
URI: http://eprints.iisc.ac.in/id/eprint/65634

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