Lifetime of oil-impregnated paper under pulse stress at different frequencies

P. Mathew; M. Ghaffarian Niasar

Lifetime of oil-impregnated paper under pulse stress at different frequencies

^*Corresponding author for this work

High Voltage Technology Group

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

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Abstract

With the increasing penetration of power electronic interfaces in the power grid, insulation materials will begin to experience stresses at higher frequencies than the conventional 50 Hz AC. This article studies the lifetime curves of oil-impregnated paper (OIP) under pulsed stresses and compares them at 10 kHz and 50 kHz. A pulse modulator is constructed consisting of a rectified DC supply feeding an H-bridge pulse driver connected to a 4: 200 pulse transformer. The modulator is used to apply medium voltage pulse waveforms with rise-times of T r≈ 1.8 µs across single-layer OIP samples. The results clearly show that an increase in pulse frequency significantly accelerates insulation ageing. However, it is also observed that below a certain threshold of field strength, the slope of the lifeline decreases dramatically thereby indicating decelerated ageing. Possible reasons for this phenomenon are also discussed in this article.

Original language	English
Title of host publication	Proceedings of the Nordic Insulation Symposium
Number of pages	4
Publication status	Published - 2022
Event	27th Nordic Insulation Symposium on Materials, Components and Diagnostics - Trondheim, Norway Duration: 13 Jun 2022 → 15 Jun 2022 Conference number: 27

Conference

Conference	27th Nordic Insulation Symposium on Materials, Components and Diagnostics
Abbreviated title	NordIS-22
Country/Territory	Norway
City	Trondheim
Period	13/06/22 → 15/06/22

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

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4713-Article Text-19343-1-10-20220701-3Accepted author manuscript, 1.93 MB
4713-Article Text-19343-1-10-20220701Final published version, 1.97 MB

https://www.ntnu.no/ojs/index.php/nordis/article/view/4713/4498

Cite this

@inproceedings{99f94f86ea3f412fad3c20505a68e53a,

title = "Lifetime of oil-impregnated paper under pulse stress at different frequencies",

abstract = "With the increasing penetration of power electronic interfaces in the power grid, insulation materials will begin to experience stresses at higher frequencies than the conventional 50 Hz AC. This article studies the lifetime curves of oil-impregnated paper (OIP) under pulsed stresses and compares them at 10 kHz and 50 kHz. A pulse modulator is constructed consisting of a rectified DC supply feeding an H-bridge pulse driver connected to a 4: 200 pulse transformer. The modulator is used to apply medium voltage pulse waveforms with rise-times of T r≈ 1.8 µs across single-layer OIP samples. The results clearly show that an increase in pulse frequency significantly accelerates insulation ageing. However, it is also observed that below a certain threshold of field strength, the slope of the lifeline decreases dramatically thereby indicating decelerated ageing. Possible reasons for this phenomenon are also discussed in this article.",

author = "P. Mathew and {Ghaffarian Niasar}, M.",

note = "Green Open Access added to TU Delft Institutional Repository {\textquoteleft}You share, we take care!{\textquoteright} – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. ; 27th Nordic Insulation Symposium on Materials, Components and Diagnostics, NordIS-22 ; Conference date: 13-06-2022 Through 15-06-2022",

year = "2022",

language = "English",

booktitle = "Proceedings of the Nordic Insulation Symposium",

}

TY - GEN

T1 - Lifetime of oil-impregnated paper under pulse stress at different frequencies

AU - Mathew, P.

AU - Ghaffarian Niasar, M.

N1 - Conference code: 27

PY - 2022

Y1 - 2022

N2 - With the increasing penetration of power electronic interfaces in the power grid, insulation materials will begin to experience stresses at higher frequencies than the conventional 50 Hz AC. This article studies the lifetime curves of oil-impregnated paper (OIP) under pulsed stresses and compares them at 10 kHz and 50 kHz. A pulse modulator is constructed consisting of a rectified DC supply feeding an H-bridge pulse driver connected to a 4: 200 pulse transformer. The modulator is used to apply medium voltage pulse waveforms with rise-times of T r≈ 1.8 µs across single-layer OIP samples. The results clearly show that an increase in pulse frequency significantly accelerates insulation ageing. However, it is also observed that below a certain threshold of field strength, the slope of the lifeline decreases dramatically thereby indicating decelerated ageing. Possible reasons for this phenomenon are also discussed in this article.

AB - With the increasing penetration of power electronic interfaces in the power grid, insulation materials will begin to experience stresses at higher frequencies than the conventional 50 Hz AC. This article studies the lifetime curves of oil-impregnated paper (OIP) under pulsed stresses and compares them at 10 kHz and 50 kHz. A pulse modulator is constructed consisting of a rectified DC supply feeding an H-bridge pulse driver connected to a 4: 200 pulse transformer. The modulator is used to apply medium voltage pulse waveforms with rise-times of T r≈ 1.8 µs across single-layer OIP samples. The results clearly show that an increase in pulse frequency significantly accelerates insulation ageing. However, it is also observed that below a certain threshold of field strength, the slope of the lifeline decreases dramatically thereby indicating decelerated ageing. Possible reasons for this phenomenon are also discussed in this article.

M3 - Conference contribution

BT - Proceedings of the Nordic Insulation Symposium

T2 - 27th Nordic Insulation Symposium on Materials, Components and Diagnostics

Y2 - 13 June 2022 through 15 June 2022

ER -

Lifetime of oil-impregnated paper under pulse stress at different frequencies

Abstract

Conference

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