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Partial Discharge Testing for Cables

Partial Discharge Testing for Cables | FamilyImage
Partial Discharge Testing for Cables | FeatureInfographics

Partial discharge (PD) testing provides critical information about the quality of cable insulation and its impact on your critical facility. If your medium- and high-voltage cable system has voids, gaps, or other defects, it’s vulnerable to PD. Left unchecked, these small electrical sparks can erode the insulation, eventually leading to unplanned outages. PD testing for cables helps you prioritize your maintenance resources and repair or replace cables before this failure occurs.


  • Site visit and report provides an opportunity to review your single-line diagram, complete a physical check of your cable system, and document test results and recommendations
  • Innovative technology enables our test engineers to observe phase-related patterns of discharge, online and in real-time
  • Online PD testing provides a non-destructive, inexpensive testing option that can be performed while your equipment is energized at normal operating voltages
  • Permanently mounted sensors installed on hard-to-access equipment and areas that pose a safety concern facilitate safer, more efficient partial discharge detection
  • Short-term continuous monitoring allows cables to be continuously monitored under load ranging from one hour up to three months
  • Permanent continuous online monitoring delivers continuous and accurate information on the condition of the most critical cables in your system
  • Ultrasonics increase the reliability of correct detection of PD when used with other testing technologies
  • Offline PD testing measures your cable system’s response to a specific stress level and predicts its future performance without creating a fault
  • Tan-delta testing measures the level of deterioration of cable, detects water trees, and helps predict cable life expectancy
  • Very low frequency (VLF) testing is used to evaluate insulation deterioration in cables, check the AC integrity of cables, and help prioritize maintenance decisions


  • Improved system reliability occurs when failure-causing PD is remedied
  • Optimized maintenance and capital expenditures are possible as PD testing helps prioritize equipment requiring maintenance, repair or replacement
  • Fewer unplanned outages and system downtime results from early identification of PD
  • Improved risk management happens when PD is regularly monitored and addressed prior to probable failure

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