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Optimization of coronary rings on high-voltage lines

High-voltage simulation in ANSYS

Sector: Electrical engineering/electronicsSpecialist field: Electromagnetics

The Swiss PFISTERER SEFAG AG uses ANSYS Workbench for the simulation of the developing electric field in a new high-voltage insulator.

Summary

Task

A customer requested a significantly lower electrical field on high-voltage insulators than usual. New types of silicone insulators were developed for this purpose. The corona rings had to be optimized for the dissipation of the corona voltage.

Solution

The geometric dimensions of the coronary rings were parameterized and an iterative optimization procedure in ANSYS allowed the maximum electric field value to be reduced to the desired level.

Customer benefits

With the simulative validation, the engineers at PFISTERER SEFAG received a suitable model for the start of production without having to produce extensive iterative prototypes.

Project Details

Task

PFISTERER SEFAG AG develops and produces insulators and fittings for worldwide use in power supply networks. A customer requested a significantly lower electrical field on high-voltage insulators than usual. New types of silicone insulators were developed for this purpose. In the design process of the new insulators, it was crucial to achieve a sufficiently low electrical field on the insulator surface to prevent damage from corona discharges. For the dissipation of the corona voltage, the geometry of the corona rings at the end of the insulators had to be optimized accordingly.


Customer Benefit

With the completion of this study, PFISTERER SEFAG received:

  • a suitable model from the simulative validation for the start of production without having to produce extensive iterative prototypes.
  • extended knowledge about the influence of geometric parameters on the electric field.
  • a CADFEM consultation with knowledge transfer, which enables the engineers to carry out similar analyses on future new designs themselves, using the intuitive interface of ANSYS Workbench.

Solution

An electrostatic assumption with adapted maximum voltages was used. Since electrostatic analyses are not included in the mechanics module of ANSYS Workbench, a 3D thermostatic analysis with adapted units and material properties was used to calculate the electric field in the air and in the structure.

The geometric dimensions of the corona rings were parameterized and an iterative optimization procedure in ANSYS allowed the maximum electric field value to be reduced to the desired level.

Images: © PFISTERER SEFAG AG


Head of Engineering

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