Monitoring of Overhead Transmission Conductors Subjected to Static and Impact Loads Using Fiber Bragg Grating Sensors

It has previously been shown that the next-generation polymer core composite high-voltage transmission line conductors under severe transverse impact conditions develop complex failure modes strongly dependent on the type and magnitude of external multiaxial loads. In this paper, we greatly improve...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2019-02, Vol.68 (2), p.595-605
Main Authors: Waters, Daniel H., Hoffman, Joseph, Kumosa, Maciej
Format: Article
Language:English
Subjects:
Axial stress
Conductors
Failure modes
Fiber Bragg grating (FBG) sensing
Fiber gratings
finite-element (FE) analysis
High voltages
Impact loads
low-velocity impact
Monitoring
Optical fibers
Optical measuring instruments
Optical properties
Optical sensors
polymer matrix composites
Rods
Sensor arrays
Sensors
Strain
transmission line conductors
Transmission lines
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Summary:It has previously been shown that the next-generation polymer core composite high-voltage transmission line conductors under severe transverse impact conditions develop complex failure modes strongly dependent on the type and magnitude of external multiaxial loads. In this paper, we greatly improve our understanding of the dynamic structural response of the conductor subjected to low-velocity impacts. We successfully demonstrate that fiber Bragg grating (FBG) sensors could be a viable technique for in-service monitoring of the conductors subjected to a variety of static and impact situations. It is shown that under static and low-energy/velocity conditions, the sensors can accurately measure strains both on the bare rods and inside the conductors. The accuracy of the sensors is independently verified by performing finite-element calculations of associated strains in the rods under axial tension and three- and four-point bend loading conditions. The tests on the full-scale conductors under low-energy impact also show that the sensors can identify the location and magnitude of impact with a very high degree of sensitivity. These results, combined with the intrinsic properties of optical sensors and fibers, indicate the FBG sensors could be especially useful in the monitoring of low- and high-energy impact events in service.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2018.2851698