Defect Blog

Category Archives: Utility

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.

Dec 21 2017

Water Trees Don't Fail Cable

By: Ben Lanz and Bill Corrente

Posted in: Wind, Utility, Solar, Renewable, Generation, Facility, Cable

Water Trees Don't Fail Cable Decades ago we learned from many of the leading industry experts that water trees fail cable and we believed this industry myth until we collected cable performance data using the  IMCORP Factory Grade&re... Read Article

Jun 09 2017

Termination Damaged but Passed by VLF Test

By: Ben Lanz and Bill Corrente

Posted in: Workmanship, Wind, Utility, Solar, Renewable, Generation

Termination Damaged but Passed by VLF Test Our utility client asked us to commission cable systems at a new generation facility after experiencing several termination failures.  The installation contractor had already tested the cable syste... Read Article

Oct 28 2015

PD Activity Identified During Assessment of Aged Utility Cable


Posted in: Utility, Cable

During the reliability assessment of aged underground residential distribution (URD) cable systems at a mid-western electric utility, one particular cable sample was found to exhibit low levels partial discharge (PD) activity. These PD sites were e... Read Article

Oct 27 2015

Low Signal Magnitude (pC) but Serious Cable Defect

By: Ben Lanz and Bill Corrente

Posted in: Workmanship, Wind, Utility, Renewable, Cable

While commissioning new generation project in the multiple defects were identified within the cable system. One particular cable exhibited defects in the dozens of low magnitude partial discharge signals at two times the operating voltage.  Th... Read Article

Jul 30 2012

Stone in Cable 176m (578ft) from Termination

By: Ben Lanz and Bill Corrente

Posted in: Backfill, Cable, Facility, Generation, Renewable, Solar, Utility, Wind, Workmanship

IMCORP’s  Factory Grade® assessment discovered a substandard  location while commissioning the cable systems at a generation facility. The client used IMCORP’s Location Matching service to pinpoint the defect location. N... Read Article

Apr 16 2012

Misplaced Stress Relief Material at a Utility


Posted in: Workmanship, Utility

This particular open-air termination transitions an underground line to a riser. Although visual inspection indicated that the cable was properly installed (it is difficult to see the mastic placement with the termination installed), the cable ... Read Article