Endverschluss beschädigt, aber VLF-Prüfung bestanden
By: Ben Lanz and Bill Corrente
Posted in: Workmanship, Wind, Utility, Renewable, Generation, Facility, Cable
Endverschluss beschädigt, aber VLF-Prüfung bestanden Nachdem ein Energieversorger mehrere Endverschlussdefekte hatte, erteilte er uns den Auftrag für die Inbetriebnahme von Kabelsystemen bei einem neuen Kraftwerk. Zuvor hatt... Read ArticlePD Activity Identified During Assessment of Aged Utility Cable
By: IMCORP
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 evi... Read ArticleVery 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 times ... Read ArticleWind Farm Cable with a Small but Very Serious Defect
By: IMCORP
Posted in: Workmanship, Wind, Renewable
After performing an initial Factory Grade® technology 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) activit... Read ArticleOil Damaging to Cable Semicon
By: IMCORP
While performing a Factory Grade® technology assessment on a cable at a utility client in the southern part of the US, substandard partial discharge (PD) was observed near a termination. Upon visual inspection it was noted that the cable&r... Read ArticleCable Manufacturer’s Defect Found at a Renewable Site
By: IMCORP
As part of commissioning of a new renewable energy site in the Midwest, IMCORP's Factory Grade® technology assessment was performed on the entire site cable collector system. Substandard partial discharge (PD) activity (per I... Read ArticleSevere Termination Damage at a Utility
By: IMCORP
An IMCORP Field Engineer was performing a Factory Grade® technology asessement for a utility client. The test results showed partial discharge (PD) at operating voltage in the far end open air termination. Upon investigation of the far... Read ArticleMultiple Defects Found at a Wind Farm
By: IMCORP
Just a few weeks ago, IMCORP was performing its Factory Grade® technology assessment at a wind site in Canada. The test indicated substandard partial discharge (PD) at the near end termination. To determine the source of the PD, the as... Read ArticleCarbon Black Residue at a Utility Cable Termination
By: IMCORP
IEEE 386 Non-Compliant While performing IMCORP's Factory Grade® technology assessment for a utility client, IMCORP detected sub-standard partial discharge (PD) activity at a URD cable termination. After the assist... Read ArticleDamaged Semicon at Termination at a Wind Farm
By: IMCORP
IEEE 386 Non-Compliant While commission testing a renewable energy generation site, IMCORP’s Factory Grade® technology assessment found partial discharge(PD) activity near a T-body termination. Visual inspection of the terminati... Read ArticleIssues with Termination at a Utility
By: IMCORP
IEEE 386 Non-Compliant Earlier this year, IMCORP was performing its Factory Grade® technology assessment for a utility client and detected PD at 1.3 times operating voltage at the far end termination (not meeting IEEE 386 requi... Read ArticleElectrical Tree in an Aged XLPE Cable
By: IMCORP
Electrical Tree in Aged URD Cable A few years ago at a client utility in the Midwest, IMCORP was performing a Factory Grade® technology assessment on an aged 2615 foot long XLPE cable. As the high voltage portion of the test w... Read ArticleAmbers in Cable Insulation at a Renewable Generation Facility
By: IMCORP
Cable not meeting ICEA S-94-649 standard A little while back at a renewable energy generation facility, IMCORP was conducting a Factory Grade® technology assessment on collector system cables when this pair of defects was uncov... Read ArticleSevere Cable Defect at a Wind Farm
By: IMCORP
Cable not meeting ICEA S-94-649 standard In 2012, IMCORP was again contracted to commission a wind farm collector system using Factory Grade® technology. During the course of testing, the IMCORP Field Supervisor came acros... Read ArticleImproper Installation of Stress Control
By: IMCORP
When: November 2011 Where: Wind farm in West Virginia. The owner of this wind farm had IMCORP perform testing on their aged cable systems in the past. However, for new cable installations they chose to use VLF testing. Within one year of in... Read ArticleTermination Failure at a Wind Farm
By: IMCORP
This client used Factory Grade® technology to commission a shielded power cable system, linking a substation with a generation plant. We found twelve cable terminations on the substation end of the circuits to be performing well below ... Read ArticleImproper Insulation Cutback On A Cold Shrink Termination
By: IMCORP
The above image; taken at a nuclear power plant in Southeast USA, shows a jagged cutback on an open-air cold shrink termination. During a cable system installation, the utility used Tangent Delta (TD), Very Low Frequency AC destructive wit... Read ArticleNail in Cable 578ft From Termination
By: IMCORP
In November 2011, the IMCORP Factory Grade® technology assessment discovered this compromised section of cable at a wind farm in Kansas. The customer used IMCORP’s Location Matching service to pinpoint the defect location. ... Read ArticlePD Activity in a Y Joint at a Nuclear Facility
By: IMCORP
Posted in: Workmanship, Generation
In 2008, IMCORP conducted its Factory Grade® technology 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... Read ArticleNon 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® technology assessment found this joint to be substandard, the cable system... Read ArticleNon Radial Power Cable Cutback at a Power Plant
By: IMCORP
This is the open-air termination of a solid dielectric cable featuring ethylene propylene rubber insulation (the salmon colored section). Initially, this cable was deemed to be in good working order after passing a one-hour, 3Uo VLF withstand tes... Read ArticleMisplaced 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 ArticleEmbedded Semicon in Insulation during Cutback at a Wind Farm
By: IMCORP
Posted in: Workmanship, Wind, Generation, Cable
The cable displayed here was compromised as a result of the misuse of an insulation-stripping tool when being installed at a wind farm. At the insulation cutback, the contractor had inadvertently cut too deep, resulting in a small slice of semi-c... Read ArticleIssues 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 ArticleImproper Heat Shrink Application on Power Cable at a Wind Farm
By: IMCORP
Posted in: Workmanship, Wind, Generation
These images show the development (from November 2008 to March 2009) of a medium voltage cable failure in an open-air termination at a wind farm in Minnesota. The first image shows non-compliant heat shrink at the termination that was located b... Read ArticlePower 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 ArticleDamage to Power Cable from a Neutral Wire Repair
By: IMCORP
Posted in: Workmanship, Wind
IMCORP's Factory Grade® technology assessment indicated a PD site in an underground medium voltage power cable at a wind farm in Texas. Initial inspection of the PD site did not show any evidence of an issue. IMCORP's confiden... Read ArticleWhittled 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® technology assessment indicated PD activity at the sep... Read ArticlePower Cable Termination Cutback Issues at a Data Center
By: IMCORP
Posted in: Workmanship, Facility
Pictured here are live front terminations of a 7.2 kV (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. A... Read ArticlePower 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 ArticlePower 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 during the summer of 2006. The client believed that the medium voltage power cable termination ends at the substation were in fine working order. Also, e... Read ArticlePower 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 during the summer of 2006 provided an ... Read Article