Defect Blog

Each year, millions of people and thousands of businesses are impacted by underground cable system failures. IMCORP is dedicated to advancing the understanding of how these failures occur and more importantly, how they can be avoided.

Feb 05 2014

Severe Termination Damage at a Utility



An IMCORP Field Engineer was performing a Factory Grade® asessement for a utility client. The assessment results showed partial discharge (PD) at operating voltage in the far end open air termination. Upon investigation of the far end termination, multiple stress enhancements and voids were found. As you can see from the photo, there is severe damage to this termination. There are deep gouges in the insulation, contamination on the cable insulation surface and a jagged semicon cut-back. Over time, the erosion process associated with PD would have caused the insulating material to further deteriorate, eventually forming an electrical tree and causing the cable to fail in service.