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Computer Simulation of Partial Discharges in Voids inside Epoxy Resins Using Three-Capacitance and Analytical Models.

Johnatan M Rodríguez-Serna1, Ricardo Albarracín-Sánchez1, Ming Dong2

  • 1Department of Electrical and Electronic Engineering, Automatic Control, and Applied Physics, School of Industrial Design and Engineering (ETSIDI), Universidad Politécnica de Madrid (UPM), Ronda de Valencia 3, 28012 Madrid, Spain.

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|January 8, 2020
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Summary

This study reviews epoxy resin insulation in high-voltage equipment and models partial discharges (PD). Simulations using modified capacitance and analytical models show reasonable agreement with experimental data for PD characteristics.

Keywords:
condition monitoringepoxy resininduced-charge conceptinsulation ageingpartial dischargesthree-capacitance model

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Polymer Science

Background:

  • Epoxy resins are crucial insulating materials in high-voltage (HV) electrical assets like power transformers and hydrogenerators.
  • Assessing the condition of epoxy resin insulation under HV stress is essential for reliable operation.
  • Understanding epoxy resin characteristics and the impact of nano-fillers is key for insulation system improvements.

Purpose of the Study:

  • To review epoxy resin applications and characteristics as insulating materials.
  • To summarize improvements in epoxy resins using nano-fillers.
  • To detail models for simulating partial discharges (PD) in solid dielectrics like epoxy resins.

Main Methods:

  • Review of theoretical background and state-of-the-art for three-capacitance and analytical PD models.
  • Critical analysis of modeling procedures, assumptions, and proposed improvements.
  • Simulation of a case study using a modified three-capacitance model and an analytical model.

Main Results:

  • Simulation results for PD rate, q-φ-n diagrams, and electric charge align reasonably with literature data.
  • Capacitance models, while implementable in circuit simulation packages, are computationally intensive.
  • The modified three-capacitance model, though less precise than finite element or analytical models, provides results consistent with real-world data.

Conclusions:

  • Both modified capacitance and analytical models offer valuable insights into PD behavior in epoxy resins.
  • Simulation accuracy is balanced against computational cost, with analytical models generally offering higher precision.
  • Further research can refine PD modeling for more accurate condition assessment of epoxy resin insulation.