A variable frequency model of a transformer bushing with localised moisture content

D. J. Smith; S. G. McMeekin; B. G. Stewart; P. A. Wallace

doi:10.1109/CEIDP.2012.6378817

A variable frequency model of a transformer bushing with localised moisture content

D. J. Smith^*, S. G. McMeekin, B. G. Stewart, P. A. Wallace

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

14 Citations (Scopus)

Abstract

Moisture ingress within a high voltage power transformer bushing can be detrimental to the insulation and causes the majority of bushing failures. In practice, wet bushings are known to have moisture accumulate within the lower region of the condenser. However, traditional power frequency measurements are often too insensitive to adequately evaluate these moisture conditions. Variable frequency analysis can provide a more sensitive estimation of moisture content, but bushing frequency responses are not well documented. In this paper, a simplified bushing model is used to evaluate moisture content within the insulation, for both uniformly distributed and localised wet regions. Numerical software is used to model the dissipation factor and capacitance, as a function of frequency and temperature. It was found that a localised wet region which had a 1.0% moisture content, with an impregnation of between 5% and 20%, was not distinguishable from a uniformly distributed 0.5% moisture content. However, when the localised region moisture percentage increased to 4.0%, a distinction could be made by a steeper response at frequencies of less than 0.1Hz.

Original language	English
Title of host publication	2012 Annual Report Conference on Electrical Insulation and Dielectric Phenomena
Publisher	IEEE
Pages	451-454
Number of pages	4
ISBN (Electronic)	9781467312523, 9781467312516
ISBN (Print)	9781467312530
DOIs	https://doi.org/10.1109/CEIDP.2012.6378817
Publication status	Published - 13 Dec 2012
Event	2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2012 - Montreal, Canada Duration: 14 Oct 2012 → 17 Oct 2012 Conference number: 13174933

Publication series

Name
Publisher	IEEE
ISSN (Print)	0084-9162
ISSN (Electronic)	0084-9162

Conference

Conference	2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2012
Country/Territory	Canada
City	Montreal
Period	14/10/12 → 17/10/12

Keywords

Moisture
Insulators
Capacitance
Temperature
Temperature dependence
Software

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Documents and Links

10.1109/CEIDP.2012.6378817

Cite this

@inproceedings{8888ec7cf9a840f8aa82a395e955790e,

title = "A variable frequency model of a transformer bushing with localised moisture content",

abstract = "Moisture ingress within a high voltage power transformer bushing can be detrimental to the insulation and causes the majority of bushing failures. In practice, wet bushings are known to have moisture accumulate within the lower region of the condenser. However, traditional power frequency measurements are often too insensitive to adequately evaluate these moisture conditions. Variable frequency analysis can provide a more sensitive estimation of moisture content, but bushing frequency responses are not well documented. In this paper, a simplified bushing model is used to evaluate moisture content within the insulation, for both uniformly distributed and localised wet regions. Numerical software is used to model the dissipation factor and capacitance, as a function of frequency and temperature. It was found that a localised wet region which had a 1.0% moisture content, with an impregnation of between 5% and 20%, was not distinguishable from a uniformly distributed 0.5% moisture content. However, when the localised region moisture percentage increased to 4.0%, a distinction could be made by a steeper response at frequencies of less than 0.1Hz.",

keywords = "Moisture, Insulators, Capacitance, Temperature, Temperature dependence, Software",

author = "Smith, {D. J.} and McMeekin, {S. G.} and Stewart, {B. G.} and Wallace, {P. A.}",

year = "2012",

month = dec,

day = "13",

doi = "10.1109/CEIDP.2012.6378817",

language = "English",

isbn = "9781467312530",

publisher = "IEEE",

pages = "451--454",

booktitle = "2012 Annual Report Conference on Electrical Insulation and Dielectric Phenomena",

address = "United States",

note = "2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2012 ; Conference date: 14-10-2012 Through 17-10-2012",

}

Smith, DJ, McMeekin, SG, Stewart, BG & Wallace, PA 2012, A variable frequency model of a transformer bushing with localised moisture content. in 2012 Annual Report Conference on Electrical Insulation and Dielectric Phenomena. IEEE, pp. 451-454, 2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2012, Montreal, Quebec, Canada, 14/10/12. https://doi.org/10.1109/CEIDP.2012.6378817

TY - GEN

T1 - A variable frequency model of a transformer bushing with localised moisture content

AU - Smith, D. J.

AU - McMeekin, S. G.

AU - Stewart, B. G.

AU - Wallace, P. A.

N1 - Conference code: 13174933

PY - 2012/12/13

Y1 - 2012/12/13

N2 - Moisture ingress within a high voltage power transformer bushing can be detrimental to the insulation and causes the majority of bushing failures. In practice, wet bushings are known to have moisture accumulate within the lower region of the condenser. However, traditional power frequency measurements are often too insensitive to adequately evaluate these moisture conditions. Variable frequency analysis can provide a more sensitive estimation of moisture content, but bushing frequency responses are not well documented. In this paper, a simplified bushing model is used to evaluate moisture content within the insulation, for both uniformly distributed and localised wet regions. Numerical software is used to model the dissipation factor and capacitance, as a function of frequency and temperature. It was found that a localised wet region which had a 1.0% moisture content, with an impregnation of between 5% and 20%, was not distinguishable from a uniformly distributed 0.5% moisture content. However, when the localised region moisture percentage increased to 4.0%, a distinction could be made by a steeper response at frequencies of less than 0.1Hz.

AB - Moisture ingress within a high voltage power transformer bushing can be detrimental to the insulation and causes the majority of bushing failures. In practice, wet bushings are known to have moisture accumulate within the lower region of the condenser. However, traditional power frequency measurements are often too insensitive to adequately evaluate these moisture conditions. Variable frequency analysis can provide a more sensitive estimation of moisture content, but bushing frequency responses are not well documented. In this paper, a simplified bushing model is used to evaluate moisture content within the insulation, for both uniformly distributed and localised wet regions. Numerical software is used to model the dissipation factor and capacitance, as a function of frequency and temperature. It was found that a localised wet region which had a 1.0% moisture content, with an impregnation of between 5% and 20%, was not distinguishable from a uniformly distributed 0.5% moisture content. However, when the localised region moisture percentage increased to 4.0%, a distinction could be made by a steeper response at frequencies of less than 0.1Hz.

KW - Moisture

KW - Insulators

KW - Capacitance

KW - Temperature

KW - Temperature dependence

KW - Software

U2 - 10.1109/CEIDP.2012.6378817

DO - 10.1109/CEIDP.2012.6378817

M3 - Conference contribution

AN - SCOPUS:84872084317

SN - 9781467312530

SP - 451

EP - 454

BT - 2012 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

PB - IEEE

T2 - 2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2012

Y2 - 14 October 2012 through 17 October 2012

ER -

A variable frequency model of a transformer bushing with localised moisture content

Abstract

Publication series

Conference

Keywords

ASJC Scopus subject areas

Documents and Links

Fingerprint

Cite this