FORMATION OF CONVENTIONAL FAULT GASES AND HIGHER HYDROCARBONS IN VARIOUS INSULATION LIQUIDS UNDER ELECTRICAL FAULTS

verfasst von

Kristin Homeier, Peter Werle

Abstract

Arcing leads to enormous stress of the insulation system of a transformer and initiates ageing mechanism. The ageing processes in the insulation liquid and the plasma atmosphere produce several fault gases. The well-established dissolved gas analysis (DGA) allows the detection of transformer fault type. In addition to the conventional fault gases, also higher C₃ to C₅ hydrocarbons are generated during electrical stress. This new fault gases could allow the development of a more reliable DGA interpretation algorithm due to the reduction of failures during oil sampling and transport as well as a better classification of the faults within a fault type. In this contribution, four different insulation liquids, a natural and a synthetic ester, a gtl-oil and an uninhibited mineral oil, were investigated regarding to their gassing behaviour under electrical stress. Large differences in the amount as well as the type of fault gases were obvious. In addition to the typical conventional fault gases, further C₃ and C₄ hydrocarbons could also be identified as characteristic fault gases. Furthermore, a clear correlation could be observed between impulse energy, number of breakdowns and the concentration of gases. With increasing of energy or number of impulses, more fault gases are generated.

Organisationseinheit(en)

Fachgebiet Hochspannungstechnik und Asset Management (Schering-Institut)
Institut für Elektrische Energiesysteme

Typ

Konferenzaufsatz in Fachzeitschrift

Journal

IET Conference Proceedings

Band

2023

Seiten

1229-1235

Anzahl der Seiten

7

ISSN

2732-4494

Publikationsdatum

2023

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Allgemeiner Maschinenbau

Elektronische Version(en)

https://doi.org/10.1049/icp.2024.0791 (Zugang: Geschlossen)