IMCORP Blog

Category Archives: Workmanship

Very Low Partial Discharge Values Found While Commissioning A New Wind Farm

By: IMCORP

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

During a recent wind farm commissioning project in the southern United States multiple defects were identified within the collector cable system. One particular cable exhibited defects in the form of very low levels of partial discharge at two time... Read Article


Wind Farm Cable with a Small but Very Serious Defect

By: IMCORP

Posted in: Workmanship, Wind, Renewable

After performing an initial Factory Grade® assessment at a renewable energy plant, a cable was found to have near end termination discharge at operating voltage. The on-site crew attempted to mitigate the Partial Discharge (PD) activity by disa... Read Article


PD Activity in a Y Joint at a Nuclear Facility

By: IMCORP

Posted in: Workmanship, Generation

IMCORP conducted its Factory Grade® assessment on a critical loop at a government nuclear facility in southeast USA. This particular PD occurred at a Y-joint located 185 ft. and had an inception voltage of Uo. PD a... Read Article


Non Radial Cutback on a Cold Shrink Joint at a Wind Farm

By: IMCORP

Posted in: Workmanship, Wind, Generation

This cold shrink joint was a part of a feeder cable system at a wind farm site that failed to pass IEEE 404 specifications. Even after the Factory Grade® assessment found this joint to be substandard, the cable system's contracto... Read Article


Misplaced Stress Relief Material at a Utility

By: IMCORP

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


Semicon Defect During Installation

By: IMCORP

Posted in: Workmanship, Wind, Generation, Cable

The cable displayed here was compromised as a result of a semicon cutback error that was not recognized as a defect by the installer. When the cutback was made, the installer created a slight spiral instead of a radial cut leaving a thin slice of... Read Article


Issues Performing Cutback on Out of Round Power Cable at a Wind Farm

By: IMCORP

Posted in: Workmanship, Wind, Generation

Featured here are medium voltage feeder cables at a wind farm substation in South Dakota. These cables are the site’s most critical link, handling the output of 10 to 20 turbines. IMCORP Factory Grade® technology found that ... Read Article


Improper Heat Shrink Application

By: IMCORP

Posted in: Workmanship, Wind, Generation

These images show the development of a medium voltage cable failure in an open-air heat shrink termination. The first image (left) shows the IEEE 48 non-compliant heat shrink at the termination that was located by the IMCORP's Factory ... Read Article


Power Cable Degassing

By: IMCORP

Posted in: Workmanship, Wind, Generation

These images show cross-sections of a medium voltage power cable that was installed at a wind farm in Wyoming. In this case, the IMCORP Factory Grade® technology indicated partial discharge activity on a section of cable. The PD l... Read Article


Cable Manufacturer Defect During Repair

By: IMCORP

Posted in: Workmanship, Wind

IMCORP's Factory Grade® assessment indicated a PD site in an underground medium voltage power cable. Initial inspection of the PD site did not show any evidence of an issue. According to the latest study no visual evidence is reported ... Read Article


Whittled Cutback on Power Cable at a Co-op Utility

By: IMCORP

Posted in: Workmanship, Wind

This image shows a 7.2 kV (medium voltage) power cable system at a co-op utility in rural Missouri that supplies power to a residential area.  IMCORP's Factory Grade® assessment indicated PD activity at the separable connector... Read Article


Power Cable Termination Cutback Issues at a Data Center

By: IMCORP

Posted in: Workmanship, Facility

Pictured here are live front terminations of a medium voltage power cable system at a critical data center in Portland, OR.  After termination failures began to occur, DC HiPot testing had been utilized but came back inconclusive. At this po... Read Article


Power Cable Insulation Damage (Sabotage) at a Wind Farm

By: IMCORP

Posted in: Workmanship, Generation, Cable

The discovery of this medium voltage power cable defect at a site in Canada provided an opportunity to demonstrate the effectiveness of IMCORP’s cable diagnostics. On a cable of over 1400 feet, IMCORP was able to locate the defect within si... Read Article


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