Influence of AC Frequency and Mechanical Strain on Electrical Tree Growth

Frances Hu; M. Sato; T. Umemoto; A. Kumada; Simon Rowland; Tony Chen

doi:10.1109/ceidp61707.2025.11218332

Influence of AC Frequency and Mechanical Strain on Electrical Tree Growth

Frances Hu, M. Sato, T. Umemoto, A. Kumada, Simon Rowland, Tony Chen^*

^*Corresponding author for this work

Research output: Chapter in Book/Conference proceeding › Conference contribution › peer-review

Abstract

This study investigates the impact of mechanical strain and electrical AC frequency on electrical tree growth in crosslinked polyethylene (XLPE) samples from 66 kV cables. XLPE samples were subjected to compressive and tensile strains up to 5.7% under 500 Hz, with results compared to previous testing at 50 Hz. Tree growth, initiation time, partial discharge, and geometry were analyzed. The study reveals that strain influences the direction of tree growth, with wider structures observed under compressive strain and narrower structures under tensile strain. Tree growth rate is faster at 500 Hz compared to 50 Hz, resulting in a lower probability of 'pine-branch' type trees observed at higher frequencies, and a reduced effect on the electrical tree growth due to strain.

Original language	English
Title of host publication	IEEE Conference on Electrical Insulation and Dielectric Phenomena
Publisher	IEEE
DOIs	https://doi.org/10.1109/ceidp61707.2025.11218332
Publication status	Published - 14 Sept 2025

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10.1109/ceidp61707.2025.11218332

Influence_of_frequency_and_mechanical_strain_on_electrical_tree_growth_ConferenceProc (1)Accepted author manuscript, 1.97 MBLicence: CC BY

Offshore Engineering and Energy
Stallard, T. (PI), Stansby, P. (PI), Draycott, S. (PI), Ouro, P. (PI), Mullings, H. (PI), Tang, T. (PI), Ali, K. (PGR student), Liao, Z. (Researcher), Mohamed, O. S. (Researcher), Araya Araya, D. (Researcher) & Zhang, Y. (Researcher)
1/01/05 → …
Project: Research

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@inproceedings{f6827ed8db4d4ccb9609eaef8d08ac53,

title = "Influence of AC Frequency and Mechanical Strain on Electrical Tree Growth",

abstract = "This study investigates the impact of mechanical strain and electrical AC frequency on electrical tree growth in crosslinked polyethylene (XLPE) samples from 66 kV cables. XLPE samples were subjected to compressive and tensile strains up to 5.7\% under 500 Hz, with results compared to previous testing at 50 Hz. Tree growth, initiation time, partial discharge, and geometry were analyzed. The study reveals that strain influences the direction of tree growth, with wider structures observed under compressive strain and narrower structures under tensile strain. Tree growth rate is faster at 500 Hz compared to 50 Hz, resulting in a lower probability of 'pine-branch' type trees observed at higher frequencies, and a reduced effect on the electrical tree growth due to strain.",

author = "Frances Hu and M. Sato and T. Umemoto and A. Kumada and Simon Rowland and Tony Chen",

year = "2025",

month = sep,

day = "14",

doi = "10.1109/ceidp61707.2025.11218332",

language = "English",

booktitle = "IEEE Conference on Electrical Insulation and Dielectric Phenomena",

publisher = "IEEE",

address = "United States",

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TY - GEN

T1 - Influence of AC Frequency and Mechanical Strain on Electrical Tree Growth

AU - Hu, Frances

AU - Sato, M.

AU - Umemoto, T.

AU - Kumada, A.

AU - Rowland, Simon

AU - Chen, Tony

PY - 2025/9/14

Y1 - 2025/9/14

N2 - This study investigates the impact of mechanical strain and electrical AC frequency on electrical tree growth in crosslinked polyethylene (XLPE) samples from 66 kV cables. XLPE samples were subjected to compressive and tensile strains up to 5.7% under 500 Hz, with results compared to previous testing at 50 Hz. Tree growth, initiation time, partial discharge, and geometry were analyzed. The study reveals that strain influences the direction of tree growth, with wider structures observed under compressive strain and narrower structures under tensile strain. Tree growth rate is faster at 500 Hz compared to 50 Hz, resulting in a lower probability of 'pine-branch' type trees observed at higher frequencies, and a reduced effect on the electrical tree growth due to strain.

AB - This study investigates the impact of mechanical strain and electrical AC frequency on electrical tree growth in crosslinked polyethylene (XLPE) samples from 66 kV cables. XLPE samples were subjected to compressive and tensile strains up to 5.7% under 500 Hz, with results compared to previous testing at 50 Hz. Tree growth, initiation time, partial discharge, and geometry were analyzed. The study reveals that strain influences the direction of tree growth, with wider structures observed under compressive strain and narrower structures under tensile strain. Tree growth rate is faster at 500 Hz compared to 50 Hz, resulting in a lower probability of 'pine-branch' type trees observed at higher frequencies, and a reduced effect on the electrical tree growth due to strain.

U2 - 10.1109/ceidp61707.2025.11218332

DO - 10.1109/ceidp61707.2025.11218332

M3 - Conference contribution

BT - IEEE Conference on Electrical Insulation and Dielectric Phenomena

PB - IEEE

ER -

Influence of AC Frequency and Mechanical Strain on Electrical Tree Growth

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