Entwicklung eines Online-Fehlergas-Überwachungssystems für hermetisch verschlossene Leistungstransformatoren

authored by

M. Akbari Azirani, M. Kuhnke, P. Werle, W. Sorgatz

Abstract

Transformer faults, depending on their nature, lead to decomposition of the insulating liquid and/or cellulose paper. In this process, dissolved fault gases are produced. In case of severe faults, generation of considerable amount of fault gases is expected, which will, in case of hermetically sealed power transformers, which are typical in wind parks, gradually escape from the insulating liquid and diffuse into the gas cushion. In these transformers, the tank must be hermetically sealed, because otherwise, during operation, the insulating liquid would be subjected to additional aging as a result of the absorption of oxygen and moisture from the atmosphere in addition to the temperature and thus load-dependent stress. Therefore, these transformers have a gas cushion, mostly out of nitrogen or dry air, to minimize the ingress of ambient air and thus moisture into the insulating liquid. As a cost-effective and compact alternative to gas chromatography, the development of a semiconductor-based online monitoring system of undissolved fault gases is proposed. The proposed monitoring system is based on a set of integrated sensors, tracking the concentration of fault gases in the gas cushion continuously, through which faults in the insulating system can be detected early. Furthermore, physical parameters such as temperature, pressure, and humidity are also recorded permanently.

Organisation(s)

High Voltage Engineering and Asset Management Section (Schering Institute)

External Organisation(s)

Energy Support GmbH

Type

Conference contribution

Pages

258-263

No. of pages

6

Publication date

2018

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Energy Engineering and Power Technology, Electrical and Electronic Engineering