University of Manchester

Electrical trees in epoxy resin

Roger Schurch
Project Completed

Scientific Case

The reliability of high voltage electrical insulation is critical to the quality of our power supplies and our ability to connect renewable generation to the electricity system. The most common electrical failure of solid high voltage insulation is electrical treeing. Electrical trees are micrometer channels of degradation in polymeric electrical insulation caused by electrical stress, which over long periods of time lead to destructive failure of the insulation. This work aims to study the electrical tree development through the analysis of samples at different stages of electrical tree growth, from their inception through to insulation failure. Their morphology will be related to an electrical signature known as partial discharge activity. The samples are made of epoxy resin, a common material for electrical insulation.

Experiment Design

Electrical trees. Size range of 3-20um

Scanners and Rigs
Xradia MicroXCT

Sample & Safety

Low Hazard

Scan Records

Project Report