Skip to main content

Research Repository

Advanced Search

A Contribution to Thermal Ageing Assessment of Glass Fiber Insulated Wire Based on Partial Discharges Activity

Naderiallaf, Hadi; Giangrande, Paolo; Galea, Michael

A Contribution to Thermal Ageing Assessment of Glass Fiber Insulated Wire Based on Partial Discharges Activity Thumbnail


Authors

Paolo Giangrande

Michael Galea



Abstract

This paper aims to evaluate a Type-II insulated wire (i.e., Glass fibre insulated wire) as a function of thermal ageing time based on partial discharges (PD) activity. Partial discharge inception voltage (PDIV), partial discharge extinction voltage (PDEV), and repetitive partial discharge inception voltage (RPDIV) measurements have been performed on both unaged and thermally aged specimens. Each specimen modelled the turn-to-turn insulation; hence it was made by a pair of Glass fibre wires wrapped in PTFE tape for a mechanical purpose. The PD tests have been carried out under positive and negative unipolar square waveform excitations using different rise times: 80, 400 and 800 ns. The trend of PD quantities vs exposure time demonstrates that the effect of space charge accumulation under unipolar excitation must be taken into account when unaged and thermally aged specimens are compared. Results revealed that although sometimes thermally aged samples might show a temporary superiority in the short run, unaged ones always present a better performance after space charge accumulation, as expected. Following the statistic postprocessing of the collected data, shape/slope parameters of the Weibull distribution relevant to PDIV can be used as an ageing indicator for Glass fibre insulated wire. Finally, the permittivity evaluation vs thermal and electrical stresses have been performed, relying on the measured capacitance of each specimen just after every PD test. Such analysis revealed that thermal ageing increases permittivity in the long run. However, electrical stress has different impacts on permittivity depending on the rise time, polarity, and magnitude of the applied voltage.

Citation

Naderiallaf, H., Giangrande, P., & Galea, M. (2022). A Contribution to Thermal Ageing Assessment of Glass Fiber Insulated Wire Based on Partial Discharges Activity. IEEE Access, 10, 41186-41200. https://doi.org/10.1109/ACCESS.2022.3167698

Journal Article Type Article
Acceptance Date Apr 11, 2022
Online Publication Date Apr 18, 2022
Publication Date Apr 18, 2022
Deposit Date May 5, 2022
Publicly Available Date Mar 28, 2024
Journal IEEE Access
Electronic ISSN 2169-3536
Publisher Institute of Electrical and Electronics Engineers (IEEE)
Peer Reviewed Peer Reviewed
Volume 10
Pages 41186-41200
Series ISSN 2169-3536
DOI https://doi.org/10.1109/ACCESS.2022.3167698
Keywords General Engineering; General Materials Science; General Computer Science
Public URL https://nottingham-repository.worktribe.com/output/7787609
Publisher URL https://ieeexplore.ieee.org/document/9758731

Files






You might also like



Downloadable Citations