| Autor: |
LINGVAY, Iosif, STĂNOI, Valerica, UNGUREANU, Livia-Carmen, ȘERBAN, Florentina, BORȘ, Adriana-Mariana |
| Předmět: |
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| Zdroj: |
Electrotehnica, Electronica, Automatica; apr-jun2017, Vol. 65 Issue 2, p23-30, 8p |
| Abstrakt: |
In order to assess the risk of explosion and fire in electrical equipment using electro-insulating fluids have been comparative determined gases formed after thermal ageing of some electrical use oils. The comparative experimental data obtained by gas chromatography technique on 5 different sorts of insulating fluids (a sort of vegetable oil with high oleic content and with addition of 0.5 % antioxidant "functional model" - compared with two commercial sorts of mineral oil, 1 mainly vegetable commercial oil, 1 commercial synthetic ester) thermal aged at 110 ± 30°C in closed containers (limited access to atmospheric oxygen) in contact with electrically insulating paper and / or electrical use copper, have been revealed that to mineral oils the CO2 and CO forming is determined both by the initial oxygen content of the oil and by insulating paper presence. To the esters-based oils, the CO2 and CO forming is determined by the initial oxygen content and decreases in the presence of insulating paper. To all the investigated oils the presence of copper leads to the increasing of gases forming - especially those easily flammable (H2, CH4, C2H4 and C2H6). It has also been revealed that, under similar use conditions (tank closed - limited access to atmospheric oxygen, contact with copper and insulating paper) at 1000 h ageing, the volume of gases formed in mineral oils is approx. 10 times higher than in esters-based oils. The results lead to the conclusion that the risk of fires and explosions in electric equipment with mineral oils is at least 10 times higher than with insulating fluids based on synthetic and / or natural esters. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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