Life-Time of Oil Filled Insulation Paper under Nonstandard Voltage Stresses

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F18%3A00326626" target="_blank" >RIV/68407700:21230/18:00326626 - isvavai.cz</a>

Výsledek na webu

<a href="https://ieeexplore.ieee.org/document/8526140" target="_blank" >https://ieeexplore.ieee.org/document/8526140</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1109/DIAGNOSTIKA.2018.8526140" target="_blank" >10.1109/DIAGNOSTIKA.2018.8526140</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Life-Time of Oil Filled Insulation Paper under Nonstandard Voltage Stresses

Popis výsledku v původním jazyce

In the recent years, technological development gave rise to numerous systems that utilize power semiconductor devices. As much as these devices improve the performance of electrical systems, they also pollute the network with voltage distortions. A mutual interaction between switching pulses, emitted by power electronics, and passive parameters of power system produce high-frequency harmonics and oscillating impulses. Although there are quite strict rules that define the maximum levels of such distortions, they are still theoretically able to increase the electrical stress of some parts of the power network. The distortions could, therefore, accelerate the aging process of insulation systems, which would, among others, pose a threat to the stability of electrical networks. Recently, a new aging model that respects nonsinusoidal voltage stresses has been developed. The model introduces a trio of specific parameters to describe the shape of applied voltage stress. This model has been applied to polymeric insulation, but the validity of this model for other insulation materials has not been verified yet. For this purpose, laboratory measurements with oil filled transformer paper insulation samples were carried out in our research. Voltage-time characteristics of transformer insulation paper were measured and evaluated by Weibull distribution. Parameters of Weibull distribution were determined and discussed. The increased effect of nonstandard voltage stress on a life-time of paper insulation was detected. The experimental results were discussed with the calculated results of the theoretical aging model. Specific parameters of the mentioned model were also calculated and compared with other available research publications.

Název v anglickém jazyce

Life-Time of Oil Filled Insulation Paper under Nonstandard Voltage Stresses

Popis výsledku anglicky

In the recent years, technological development gave rise to numerous systems that utilize power semiconductor devices. As much as these devices improve the performance of electrical systems, they also pollute the network with voltage distortions. A mutual interaction between switching pulses, emitted by power electronics, and passive parameters of power system produce high-frequency harmonics and oscillating impulses. Although there are quite strict rules that define the maximum levels of such distortions, they are still theoretically able to increase the electrical stress of some parts of the power network. The distortions could, therefore, accelerate the aging process of insulation systems, which would, among others, pose a threat to the stability of electrical networks. Recently, a new aging model that respects nonsinusoidal voltage stresses has been developed. The model introduces a trio of specific parameters to describe the shape of applied voltage stress. This model has been applied to polymeric insulation, but the validity of this model for other insulation materials has not been verified yet. For this purpose, laboratory measurements with oil filled transformer paper insulation samples were carried out in our research. Voltage-time characteristics of transformer insulation paper were measured and evaluated by Weibull distribution. Parameters of Weibull distribution were determined and discussed. The increased effect of nonstandard voltage stress on a life-time of paper insulation was detected. The experimental results were discussed with the calculated results of the theoretical aging model. Specific parameters of the mentioned model were also calculated and compared with other available research publications.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20201 - Electrical and electronic engineering

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika)

ISBN

978-1-5386-4424-9

ISSN

—

e-ISSN

—

Počet stran výsledku

4

Strana od-do

44-47

Název nakladatele

Czechoslovakia Section IEEE

Místo vydání

Prague

Místo konání akce

Pilsen

Datum konání akce

4. 9. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000451377600056