IMCORP Blog

Category Archives: Wind

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


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


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 Damage From Backfill

By: IMCORP

Posted in: Wind, Generation, Cable, Backfill

These images show a PD site in a medium voltage power cable, part of a collector system designed and installed at a wind farm in Idaho during 2005.  In the first few years of operation, the site experienced a very high collector syst... Read Article


Power Cable Termination Cutback Issues at a Wind Farm

By: IMCORP

Posted in: Wind, Generation

These pictures show two different live front substation terminal ends at a wind farm in Canada. The client believed that the medium voltage power cable termination ends at the substation were in fine working order. Also, external visual inspect... Read Article


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