High voltage vacuum interrupter

Name: Potential transformer electric stress
Uploaded: 2023-11-22
Duration: T511S
Channel: QuickField Support team
Description: Metal shields between the ceramic blocks of the interrupter body protect the ceramic from the metal vapor deposition during the arcing process. But they also influence the electric field distribution and may decrease the dielectric strength of the device. So a detailed analysis of the electric field is required.

QuickField simulation example

This example is inspired by Karthik Reddy Venna dissertation A Simulation Analysis to Improve the Dielectric Strength Inside High Voltage Vacuum Interrupters.
Metal shields between the ceramic blocks of the interrupter body protect the ceramic from the metal vapor deposition during the arcing process. But they also influence the electric field distribution and may decrease the dielectric strength of the device. So a detailed analysis of the electric field is required.

Problem Type
Axisymmetric problem of electrostatics.

Geometry

Given
Relative permittivity of air, vacuum ε = 1;
Relative permittivity of insulator ε = 9;
High voltage potential HV = 325 kV.

Task
Calculate the electric field stress distribution

Solution
Electric field stress distribution is calculated using QuickField and dangerously high electric stress areas are seen on the field map.

Results
Electric field strength distribution in the interrupter.

Video: High voltage vacuum interrupter. Watch on YouTube
Download simulation files (files may be viewed using any QuickField Edition).