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Medium Voltage Cable Testing Training

Medium Voltage Cable Testing Training - The Electricity Forum

You Can Access The Live Online Training Through Our Web-Based Platform From Your Own Computer. You Can See And Hear The Instructor And See His Screen Live.

You Can Interact And Ask Questions. The Cost Of The Training Also Includes 7 Days Of Email Mentoring With The Instructor.

Medium Voltage Power Cable Testing - Our 12-hour live online instructor-led training course is designed for electrical engineers, electrical technicians, and front-line electrical testing and maintenance specialists who test, install, maintain, repair, or troubleshoot medium and high voltage power cables*. Since power cables are the backbone of the worlds power distribution system, many must learn how cable systems are designed, installed, and tested, as well as the applicable Standards to follow, and how to properly select and perform the appropriate testing methods for their situation.

Students will learn of the various methods used to perform mostly off-line cable testing. An overview of all the numerous possible tests available will be offered, followed by a more detailed, comprehensive study of the most prominent technologies and test methods used today. They will learn how to perform and analyze results of insulation resistance tests (DAR & PI), DC hipot tests, Type I withstand tests (DC, AC, & VLF), and diagnostic testing using Tan Delta and Partial Discharge techniques.

Except for Installation over-voltage withstand testing of newly installed systems, most MV/HV cable testing is Diagnostic, or non-destructive, using absolute, trending, and comparative test data usually performed as part of a condition-based electrical maintenance program. Although all methods of cable testing will be explored, our course focuses on the current methods of Withstand, Tan Delta, and Partial Discharge testing using VLF and 50/60 Hz. power frequency techniques for data collection to provide specific defect information and/or the overall condition of the cable.


After attending this course, students will know how to:

  • Consider the various testing options available
  • Select the methods best suited for their application
  •  Specify the equipment needed
  • Perform the tests
  • Collect the data and analyze the results
  • Assess the health of the cables tested


           *  This course is mostly for testing of medium voltage cables, but most of the methods and technologies described are used on HV cable up to ~200 kV in rating.


WHO should attend

  • Electric Utility Engineering and Maintenance Personnel
  • Industrial, Commercial, Institutional Electrical Engineering and Maintenance Personnel
  • Electrical Consulting Engineers
  • Electrical Design Engineers


Students receive

  • FREE 100-Page Digital Wire And Cable Handbook (Value $20)
  • $100 Coupon Toward Any Future Electricity Forum Event (Restrictions Apply)
  • 1.2 Continuing Education Unit (CEU) Credits
  • 12 Professional Development Hours
  • FREE Magazine Subscription (Value $25.00)
  • Course Materials In Paper Format



MV-HV Cable Testing Training Course Outline




Cables and Cable Systems Described

  • Explanations & Definitions of components
  • Cable voltage ratings and insulation materials defined
  • Various insulation types commonly used


Why Do We Test Medium and High Voltage Cable

  • Why do we need to test new cable systems
  • Why do we need to test old cable systems
  • Why do cables and the attached accessories fail
  • What are the aging/deterioration mechanisms
  • What are the most common reasons for failures


OK, We’ll Test. What Are We Looking For

  • Depending on test method many different results occur
  • Different data sets reveal different weaknesses
  • Obvious pass/fail results from some test methods
  • Interpretation of test data required of other tests


How to Select Best Method to Use: Different Tests = Different Results

  • What’s your cable system design: radial, network, loop...
  • How long are the cables: need a portable hipot or multi-ton resonant system
  • What do you want to learn from the tests
  • What repair/replacement methods are available, practical, & economical
  • What performance criticality can you live with


Commonly Used Methods for MV/HV Cable Testing

  • Soak Test: AC Line Voltage with No Load for 24 Hours
  • Insulation Resistance (IR) Measurement: DC Voltage <1Uo
  • Leakage Current, or Hipot, Test: DC Over Voltage >3Uo
  • AC Withstand Test: AC Over Voltage @ 50/60 Hz. Power Frequency >2Uo
  • Partial Discharge AC Over Voltage Measurement: < 2Uo
  • Tan Delta AC Over Voltage Testing: < 2Uo
  • Very Low Frequency AC Withstand Test: 0.10 Hz. <3Uo
  • VLF Partial Discharge Over Voltage Test: 0.10 Hz. @ <2Uo
  • VLF Tan Delta Over Voltage Test: 0.1 Hz. @ <2Uo
  • Oscillating Wave Partial Discharge Test: 20 – 200 Hz
  • Other Rare Esoteric Tests Seldom Used




Brief Review of Cable Testing Methods & Technologies Available

  • Soak Test: AC Line Voltage with No Load for 24 Hours
  • Insulation Resistance (IR) Measurement: DC Voltage: <1Uo
  • Leakage Current, or Hipot, Test: DC Over Voltage: >3Uo
  • AC Withstand Test: AC Over Voltage @. Power Frequency: >2Uo
  • Parallel or Series Resonant Systems: >2Uo
  • Partial Discharge AC Over Voltage Measurement: < 2Uo
  • Tan Delta AC Over Voltage Testing: < 2Uo
  • Very Low Frequency AC Withstand Test: 0.10 Hz. <3Uo
  • VLF Partial Discharge Over Voltage Test: 0.10 Hz. @ <2Uo
  • VLF Tan Delta Over Voltage Test: 0.1 Hz. @ <2Uo
  • Oscillating Wave Partial Discharge Test: 20 – 200 Hz
  • Other Rare Esoteric Tests Seldom Used


Technologies & Methods Taught in This Course

  • Very Low Frequency AC Testing: 0.10 Hz. – 0.01 Hz.
  • VLF Overvoltage Withstand Testing: Pass/Fail
  • VLF Diagnostic Testing: Tan Delta & Partial Discharge


VLF Overview, History, and Acceptance 

  • What is VLF?
  • Why Use VLF?
  • What Loads is VLF used to test?
  • Where is VLF not used?
  • When was VLF used en masse?
  • Development History
  • Is 0.10 Hz. similar enough to 50/60 Hz?
  • Are all VLF Designs from various vendors the same?


VLF Testing Standards

  • IEEE Standards
  • Medium Voltage Cable Testing: Withstand & Diagnostics
  • Rotating Machinery Testing (motors & generators)
  • Other Standards or Recommendations for Medium Voltage Cable Testing
  • HV Cable Testing Standards/Recommendations

VLF Withstand & Diagnostic Tests – Which to perform? What is the Desired Result?

  • Acceptance/Proof/Commissioning via over voltage withstand test
  • What is the test, what are the rules, how do we do it?
  • Apply over voltage per standard up to 3 Uo – cable holds voltage or fails
  • If failed, now what? Repair or replace?
  • Repair: Locate fault precisely if to be dug up with repair to be made
  • Replace: Locate fault approximately to replace section with new cable


VLF Tangent Delta Test – How Good is my Cable Overall? Global Assessment

  • Used to determine the extent of insulation degradation
  • Over-voltage applied to cable of < 2 Uo
  • Voltage & Current waveforms captured and analyzed
  • Phase shift from ideal 90° measured
  • TD value produced and used for analysis and comparison
  • Is cable Good, Requires Further Study, or Needs Replacement?


Partial Discharge Test – Where are the bad spots? Specific Location and Severity

  • Used to locate defects emitting electrical noise (pd) and their locations
  • Over-voltage applied to cable of < 2 Uo
  • Voltage raised: Partial Discharge Inception Voltage (PDIV) Measured
  • Voltage lowered: Partial Discharge Extinction Voltage (PDEV) measured
  • PD voltage levels, quantity, and locations analyzed
  • Are PD points severe and need repair or less worrisome – just monitor?



  • Summary of Withstand, TD, and PD Testing.
  • Differences in Results Revealed, Ease of Use, Availability, Cost, etc.
  • When to Use Which Technology. PowerPoint of all VLF, TD, PD Models


Review of Expectations
Questions and Answers



Both days:

Start: 10 am ET
Finish: 4:30 pm ET



Live Online Course Registration Fees & CEU Credits

The registration fee to attend this live online training course is $599 + GST/HST.

Click Here to download a $100 discount coupon that you can apply toward the regular registration fee and pay only $499 + GST/HST

Register 3 delegates at full price $599, and get a 4th registration FREE!

Earn Continuing Education Unit (CEU) Credits

Successful completion of this course qualifies delegates to receive a certificate of course completion with indicated CEUs.


CEUs are granted by the Engineering Institute of Canada. One CEU is equivalent to 10 professional development hours of instruction.

This course earns 1.2 CEUs.

Live on-line or in-person. Customized.

Live online group training

We can present this Medium Voltage Cable Testing Training to your electrical engineering and maintenance staff, tailored to your specific equipment and requirements. We are ready to help design this program for you. Click on the link below to request a FREE quotation.


Mike Peschel
MV Power Cable Testing Specialist, The Electricity Forum