advanced inspection techniques for monitoring cable aging module 3 dr. john h. bickel evergreen...
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Advanced Inspection Advanced Inspection Techniques for Monitoring Techniques for Monitoring
Cable AgingCable Aging
Module 3Module 3
Dr. John H. BickelDr. John H. BickelEvergreen Safety & Reliability Technologies, LLCEvergreen Safety & Reliability Technologies, LLC
Two Types of Inspection Techniques Two Types of Inspection Techniques for Monitoring Cable Agingfor Monitoring Cable Aging
In-situ or Non-destructive MethodsIn-situ or Non-destructive Methods
Methods requiring removal of cableMethods requiring removal of cable
Time Delay ReflectrometryTime Delay ReflectrometryTDR works similar to RADARTDR works similar to RADARTDR pulse is injected to length of cableTDR pulse is injected to length of cableReflections generated at points of changes Reflections generated at points of changes
in Impedancein ImpedanceTDR historically used for transmission TDR historically used for transmission
system cable to determine moisture system cable to determine moisture buildup in cablebuildup in cable
TDR can identify problems with local TDR can identify problems with local materials breakdown, connector corrosionmaterials breakdown, connector corrosion
Time Delay ReflectrometryTime Delay Reflectrometry
Time Delay ReflectrometryTime Delay Reflectrometry
Time Delay ReflectrometryTime Delay Reflectrometry
Time Delay ReflectrometryTime Delay Reflectrometry
TDR BenefitsTDR BenefitsTDR successfully used in many types of TDR successfully used in many types of
cables and cable geometries.cables and cable geometries.TDR has found: cracking in insulation, TDR has found: cracking in insulation,
corrosion, water intrusion, poor electrical corrosion, water intrusion, poor electrical connectionsconnections
TDR can identify location of major change TDR can identify location of major change in Impedence – which requires further in Impedence – which requires further investigation.investigation.
Microscopy TechniquesMicroscopy TechniquesScanning Acoustic MicroscopeScanning Acoustic MicroscopeScanning Electron MicroscopeScanning Electron MicroscopeBoth require representative samples of Both require representative samples of
cable materialscable materialsPrimarily used to determine average Primarily used to determine average
insulation void content, void sizeinsulation void content, void size
Scanning Acoustic MicroscopyScanning Acoustic Microscopy
Scanning Acoustic MicroscopyScanning Acoustic Microscopy
Scanning Electron MicroscopyScanning Electron Microscopy
MicroscopyMicroscopyMicroscopy has been very useful in Microscopy has been very useful in
identifying mechanisms for aging related identifying mechanisms for aging related degradation.degradation.
Microscopy identified the role of gas Microscopy identified the role of gas pocket buildup in insulation layer as pocket buildup in insulation layer as mechanism of degradation. mechanism of degradation.
Not easily used for determination of Not easily used for determination of residual life.residual life.
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