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undergraduate thesis
Mjerenje površinske napetosti i gustoće elektroizolacijskih tekućina
Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2021. urn:nbn:hr:182:572398
Danković, Valentina
Josip Juraj Strossmayer University of Osijek
Department of Chemistry
Department of General, Inorganic and Physical Chemistry and Methodology of Chemistry

Institutional repository: Repository of the Department of Chemistry, Osijek

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Danković, V. (2021). Mjerenje površinske napetosti i gustoće elektroizolacijskih tekućina (Undergraduate thesis). Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry. Retrieved from https://urn.nsk.hr/urn:nbn:hr:182:572398

Danković, Valentina. "Mjerenje površinske napetosti i gustoće elektroizolacijskih tekućina." Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2021. https://urn.nsk.hr/urn:nbn:hr:182:572398

Danković, Valentina. "Mjerenje površinske napetosti i gustoće elektroizolacijskih tekućina." Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2021. https://urn.nsk.hr/urn:nbn:hr:182:572398

Danković, V. (2021). 'Mjerenje površinske napetosti i gustoće elektroizolacijskih tekućina', Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, accessed 11 March 2025, https://urn.nsk.hr/urn:nbn:hr:182:572398

Danković V. Mjerenje površinske napetosti i gustoće elektroizolacijskih tekućina [Undergraduate thesis]. Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry; 2021 [cited 2025 March 11] Available at: https://urn.nsk.hr/urn:nbn:hr:182:572398

V. Danković, "Mjerenje površinske napetosti i gustoće elektroizolacijskih tekućina", Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, Osijek, 2021. Available at: https://urn.nsk.hr/urn:nbn:hr:182:572398

Metadata
TitleMjerenje površinske napetosti i gustoće elektroizolacijskih tekućina
Title (english)Measuring of surface tension and density of electroisolation liquids
AuthorValentina Danković
MentorMartina Medvidović-Kosanović (mentor)
GranterJosip Juraj Strossmayer University of Osijek
Department of Chemistry
(Department of General, Inorganic and Physical Chemistry and Methodology of Chemistry)
Osijek
Defense date and country2021-09-29, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Physical Chemistry
Abstract
Transformator je elektromagnetski uređaj koji radi na principu Faradeyevog zakona elektromagnetske indukcije. Transformatori služe za transformaciju razine napona kroz neku točku u elektroenergetskoj mreži. Transformatorsko ili elektroizolacijsko ulje je ulje posebnih karakteristika koje je stabilno na visokim temperaturama i ima dobra izolacijska svojstva. Uloga ulja u transformatorima je hlađenje, izolacija te zaustavljanje iskrenja i koronskog pražnjenja. Također transformatorsko ulje štiti celuloznu izolaciju tako što sprječava izravan kontakt između celuloze i atmosferskog kisika. Uz to štiti i namotaje koji su potpuno uronjeni u ulje. Dvije su glavne vrste transformatorskih ulja; mineralna ulja koja mogu biti inhibirana i neinhibirana te sintetička ulja. Kod elektroizolacijskih ulja promatramo električna, fizikalna i kemijska svojstva. U ovom će se radu posebno pratiti gustoća i granična površinska napetost ulja. Praćenje gustoće transfomatorskih ulja je osobito važno jer ulje nikako ne smije biti teže od vode, jer bi pri jako niskim temperaturama led mogao isplivati na površinu ulja. Pomoću mjerenja površinske napetosti ulja možemo otkriti prisutnost polarnih zagađivača i produkata oksidacije ulja. U ovom završnom radu ispitivani su uzorci transformatorskih ulja iz transformatora u eksploataciji i jedno novo ulje. Mjerene su karakteristike osam različitih uzoraka ulja različitih proizvođača.
Abstract (english)
A transformer is an electromagnetic device which works on principle of Faraday´s Law of induction. Transformers are used to transform the voltage level through a point in the power grid. Transformer or electrical insulating oil is an oil with special characteristics that is stable at high temperatures and has good insulating properties. The role of oil in transformers is cooling, insulation and stopping sparking and corona discharge. Also transformer oil protects cellulose insulation by preventing direct contact between cellulose and atmospheric oxygen. It also protects coils that are completely immersed in oil. There are two main types of transformer oils; mineral oils that can be inhibited and uninhibited, and synthetic oils. In electrical insulation oils, we observe electrical, physical and chemical properties. In this paper, the density and ultimate surface tension of the oil will be particularily monitored. It is important to measure the density of transformer oils especially because the oil should never be havier than water, because at very low temperatures ice could float to the surface of the oil. By measuring the surface tension of the oil, we can detect the presence of polar pollutants and oil oxidation products. In this final work, samples of transformer oils from transformers in operation and one new oil were examined. The characteristics of eight different oil samples from different manufacturers were measured.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:182:572398
Study programmeTitle: Chemistry
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) kemije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) kemije)
Type of resourceText
File originBorn digital
Access conditionsOpen access
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Created on2022-08-01 07:44:55