Evaluation of structure influence within the context of water diffusion and surface current of glass reinforced polymer composites for HV insulation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23220%2F20%3A43955988" target="_blank" >RIV/49777513:23220/20:43955988 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/49777513:23520/20:43955988

Výsledek na webu

<a href="https://link.springer.com/chapter/10.1007%2F978-3-030-31680-8_21" target="_blank" >https://link.springer.com/chapter/10.1007%2F978-3-030-31680-8_21</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/978-3-030-31680-8_21" target="_blank" >10.1007/978-3-030-31680-8_21</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Evaluation of structure influence within the context of water diffusion and surface current of glass reinforced polymer composites for HV insulation

Popis výsledku v původním jazyce

This article deals with the issue of selected polymer composites consisting of a thermoset matrix and reinforcing glass fibers. These composites are designed for high voltage applications as an electrical insulating material with high mechanical durability. Three composites with a significantly matrix, specifically, epoxy, polyurethane and polyester resin, are selected with an emphasis on usability in the technical practice. Key properties of tested composites are dielectric and mechanical properties and from this point of view the homogeneity of prepared specimens is very important. An important influencing factor, which is a frequent cause of deterioration of material properties, is a higher lev-el of moisture or even direct contact with water leading to the diffusion of water into the material structure. The main subject of presenting research is therefore the assessment of the water diffusion impact on processed material in the relation to the resistance of the tested specimens to the applied high voltage. Tested composite structures are observed by optical microscopy and the computed tomography is used for analysis of the material volume. Purely surface dielectric properties in the delivered state were evaluated based on the measurement of surface current at a constant direct or alternating test voltage. Results of surface current measurement for all composites in the delivered state show minimal differences between composites. The minimal dependence, primarily for composite with polyurethane, of the water diffusion test results on the internal structure and on the character of voids within tested specimens is determined. The lowest level of voids was found for epoxy matrix composite, but this material did not pass the water diffusion test. Differences of the HV resistance obtained from the water diffusion test are most likely caused mainly by different chemi-cal resistance of resins against boiling slightly alkaline aqueous solution.

Název v anglickém jazyce

Evaluation of structure influence within the context of water diffusion and surface current of glass reinforced polymer composites for HV insulation

Popis výsledku anglicky

This article deals with the issue of selected polymer composites consisting of a thermoset matrix and reinforcing glass fibers. These composites are designed for high voltage applications as an electrical insulating material with high mechanical durability. Three composites with a significantly matrix, specifically, epoxy, polyurethane and polyester resin, are selected with an emphasis on usability in the technical practice. Key properties of tested composites are dielectric and mechanical properties and from this point of view the homogeneity of prepared specimens is very important. An important influencing factor, which is a frequent cause of deterioration of material properties, is a higher lev-el of moisture or even direct contact with water leading to the diffusion of water into the material structure. The main subject of presenting research is therefore the assessment of the water diffusion impact on processed material in the relation to the resistance of the tested specimens to the applied high voltage. Tested composite structures are observed by optical microscopy and the computed tomography is used for analysis of the material volume. Purely surface dielectric properties in the delivered state were evaluated based on the measurement of surface current at a constant direct or alternating test voltage. Results of surface current measurement for all composites in the delivered state show minimal differences between composites. The minimal dependence, primarily for composite with polyurethane, of the water diffusion test results on the internal structure and on the character of voids within tested specimens is determined. The lowest level of voids was found for epoxy matrix composite, but this material did not pass the water diffusion test. Differences of the HV resistance obtained from the water diffusion test are most likely caused mainly by different chemi-cal resistance of resins against boiling slightly alkaline aqueous solution.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20201 - Electrical and electronic engineering

Projekt

<a href="/cs/project/TH03020355" target="_blank" >TH03020355: Kompozitní konstrukce v elektrotechnice EKOM</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings of the 21st International Symposium on High Voltage Engineering (Lecture Notes in Electrical Engineering. Vol. 2)

ISBN

978-3-030-31679-2

ISSN

1876-1100

e-ISSN

1876-1119

Počet stran výsledku

8

Strana od-do

203-210

Název nakladatele

Springer Nature

Místo vydání

Cham

Místo konání akce

Budapest, Hungary

Datum konání akce

26. 8. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—