Medium Voltage Cable Testing Training

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Medium Voltage Cable Testing Training - The Electricity Forum

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

DAY ONE

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

DAY TWO

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
NETA, ANSI, ASTM, IEC, ICEA, etc.
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

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

COURSE TIMETABLE

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

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.