Abstract
Polymer jackets play an important protective role in distribution cabling by providing structure and resistance to moisture, heat, and exposure to harmful chemicals. Current methods of structural assessment, such as elongation at break (E-at-B), are inherently destructive. While other non-destructive methods such as indenter evaluation are available, they are not suitable for in-service use. We propose that second harmonic generation (SHG) could provide a non-destructive means of characterizing the aging of chlorosulfonated polyethylene (CSPE) cable jackets. SHG was used to study cables previously aged and characterized by the Electric Power Research Institute (EPRI). Comparative data between the SHG results and indenter modulus tests suggest that SHG can be used to qualitatively differentiate between minimally and significantly aged CSPE cable jackets. The results of this proof-of-concept study suggest additional work that could be done to better understand the mechanisms of the aging of CSPE cable jackets and how SHG could be used to monitor the aging process.
Highlights
Much of modern technology and society depends on the safe and reliable distribution of electric power from the point of generation to the point of consumption
While elongation at break (E-at-B) is widely accepted as a method for estimating life of materials such as Hypalon, it cannot be used on material that is intended to remain in service, because the method is inherently destructive
This initial, proof-of-concept study shows that second harmonic generation (SHG) is a promising non-destructive technique for investigating thermal aging of chlorosulfonated polyethylene (CSPE) cable jackets
Summary
Much of modern technology and society depends on the safe and reliable distribution of electric power from the point of generation to the point of consumption. Polymer jackets are used to protect the underlying distribution cable core from mechanical deformation, moisture penetration, and chemical damage during the installation and service life of the cable. Jackets enhance flame resistance, facilitate installation, and provide means for cable identification and grouping (USA Wire & Cable). Such exposure of the insulation to the outside environment would warrant additional attention and potential replacement
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