0.1Hz VLF PD vs. the IMCORP Factory Grade ® Technology Overview Concerned with the number of outages at newly commissioned collector systems, a leading renewable site developer specified IMCORP’s Factory Grade ® technology, with its unmatched 5 pC field sensitivity, as part of its site commissioning process. After several cable defects were identified, the site contractor questioned the validity of the IMCORP assessment and retested the substandard cable segments using very low frequency (VLF) power source partial discharge (PD) testing. A formal investigation at an independent laboratory using Factory Grade ® technology and thorough dissection analysis confirmed that all identified defects did not meet the cable manufacturers’ quality control testing standards. In contrast, th

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