1H NMR tests on damaged and undamaged XLPE and SiR samples

Lydia Gkoura; Taiji Wang; Athanasios Anastasiou; Noureddine Harid; Huw Griffiths; Manu Haddad; Michalis Fardis; Marina Karayianni

doi:10.1049/hve.2019.0077

¹H NMR tests on damaged and undamaged XLPE and SiR samples

Lydia Gkoura, Taiji Wang, Athanasios Anastasiou, Noureddine Harid, Huw Griffiths, Manu Haddad, Michalis Fardis, Marina Karayianni

Electrical Engineering

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Cross-linked polyethylene (XLPE) and silicone rubber (SiR) samples were subjected to a high-voltage AC stress plane–plane configuration and inclined plane test, respectively. The voltage was applied such that discharge was observed across the surface of the XLPE test sample for several hours and for visible damage to occur on SiR samples also after several hours. Selected stressed samples together with virgin samples from the same manufactured batch were tested using nuclear magnetic resonance (NMR) spectroscopy. Specifically, ¹H NMR spin–lattice (T₁) and spin–spin (T₂) relaxation time measurements were employed to examine potential changes in the chemical bonding of undamaged and damaged XLPE and SiR samples. Preliminary results show that there may be a moderate increase in the T₁ and T₂ values of the damaged samples in comparison with the undamaged ones. This raises the possibility that NMR can be a useful additional experimental tool in characterising material degradation.

Original language	British English
Pages (from-to)	203-209
Number of pages	7
Journal	High Voltage
Volume	4
Issue number	3
DOIs	https://doi.org/10.1049/hve.2019.0077
State	Published - 1 Sep 2019

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title = "1H NMR tests on damaged and undamaged XLPE and SiR samples",

abstract = "Cross-linked polyethylene (XLPE) and silicone rubber (SiR) samples were subjected to a high-voltage AC stress plane–plane configuration and inclined plane test, respectively. The voltage was applied such that discharge was observed across the surface of the XLPE test sample for several hours and for visible damage to occur on SiR samples also after several hours. Selected stressed samples together with virgin samples from the same manufactured batch were tested using nuclear magnetic resonance (NMR) spectroscopy. Specifically, 1H NMR spin–lattice (T1) and spin–spin (T2) relaxation time measurements were employed to examine potential changes in the chemical bonding of undamaged and damaged XLPE and SiR samples. Preliminary results show that there may be a moderate increase in the T1 and T2 values of the damaged samples in comparison with the undamaged ones. This raises the possibility that NMR can be a useful additional experimental tool in characterising material degradation.",

author = "Lydia Gkoura and Taiji Wang and Athanasios Anastasiou and Noureddine Harid and Huw Griffiths and Manu Haddad and Michalis Fardis and Marina Karayianni",

note = "Funding Information: The authors are grateful for the support provided by the APEC Centre, Khalifa University, the National Centre for Scientific Research {\textquoteleft}Demokritos{\textquoteright} in Greece, where the NMR tests were carried out, and the Cardiff University for providing the SiR test samples. Publisher Copyright: {\textcopyright} 2019 Institution of Engineering and Technology. All rights reserved.",

year = "2019",

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doi = "10.1049/hve.2019.0077",

language = "British English",

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T1 - 1H NMR tests on damaged and undamaged XLPE and SiR samples

AU - Gkoura, Lydia

AU - Wang, Taiji

AU - Anastasiou, Athanasios

AU - Harid, Noureddine

AU - Griffiths, Huw

AU - Haddad, Manu

AU - Fardis, Michalis

AU - Karayianni, Marina

N1 - Funding Information: The authors are grateful for the support provided by the APEC Centre, Khalifa University, the National Centre for Scientific Research ‘Demokritos’ in Greece, where the NMR tests were carried out, and the Cardiff University for providing the SiR test samples. Publisher Copyright: © 2019 Institution of Engineering and Technology. All rights reserved.

PY - 2019/9/1

Y1 - 2019/9/1

N2 - Cross-linked polyethylene (XLPE) and silicone rubber (SiR) samples were subjected to a high-voltage AC stress plane–plane configuration and inclined plane test, respectively. The voltage was applied such that discharge was observed across the surface of the XLPE test sample for several hours and for visible damage to occur on SiR samples also after several hours. Selected stressed samples together with virgin samples from the same manufactured batch were tested using nuclear magnetic resonance (NMR) spectroscopy. Specifically, 1H NMR spin–lattice (T1) and spin–spin (T2) relaxation time measurements were employed to examine potential changes in the chemical bonding of undamaged and damaged XLPE and SiR samples. Preliminary results show that there may be a moderate increase in the T1 and T2 values of the damaged samples in comparison with the undamaged ones. This raises the possibility that NMR can be a useful additional experimental tool in characterising material degradation.

AB - Cross-linked polyethylene (XLPE) and silicone rubber (SiR) samples were subjected to a high-voltage AC stress plane–plane configuration and inclined plane test, respectively. The voltage was applied such that discharge was observed across the surface of the XLPE test sample for several hours and for visible damage to occur on SiR samples also after several hours. Selected stressed samples together with virgin samples from the same manufactured batch were tested using nuclear magnetic resonance (NMR) spectroscopy. Specifically, 1H NMR spin–lattice (T1) and spin–spin (T2) relaxation time measurements were employed to examine potential changes in the chemical bonding of undamaged and damaged XLPE and SiR samples. Preliminary results show that there may be a moderate increase in the T1 and T2 values of the damaged samples in comparison with the undamaged ones. This raises the possibility that NMR can be a useful additional experimental tool in characterising material degradation.

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VL - 4

SP - 203

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JO - High Voltage

JF - High Voltage

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ER -

¹H NMR tests on damaged and undamaged XLPE and SiR samples

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