Details
| Translated title of the contribution | Pressure dependent partial discharge inception in hermetically sealed power transformers |
|---|---|
| Original language | German |
| Title of host publication | VDE-Fachtagung Hochspannungstechnik 2018 |
| Publisher | VDE Verlag GmbH |
| Pages | 231-235 |
| Number of pages | 5 |
| ISBN (electronic) | 9783800748075 |
| Publication status | Published - 2018 |
| Event | VDE-Fachtagung Hochspannungstechnik 2018 - VDE Conference on High Voltage Technology 2018 - Berlin, Germany Duration: 12 Nov 2018 → 14 Nov 2018 |
Publication series
| Name | VDE-Fachtagung Hochspannungstechnik 2018 |
|---|
Abstract
Hermetically sealed power transformers have several advantages compared with conventional transformers with conservator. They are more compact and do not require air drying equipment, which need regular maintenance. Therefore, hermetically sealed transformers are common choice for wind power plants. In recent years there have been many reports of transformer failures in these wind power plants. Most of them related to partial discharges in the transformers. The thermal expansion of the insulating liquid can lead to a severe change of the internal pressure. Therefore, the pressure dependent PD inception for five different insulating liquids is investigated with different electrode configurations. A transformer model with two special electrodes resembling high voltage windings and aramid paper is used inside a test vessel with temperature and pressure control. With this model the PD inception can be measured at different pressures and temperatures. The electrodes can be replaced with standard needle-sphere electrodes. To investigate the influence of the dissolved gas in the liquid, the liquids are dried and degassed and then saturated with different gasses prior to the measurement. To compare these model results with a real transformer, the PD inception voltage is measured on a hermetically sealed 160 kVA transformer with varying internal pressure.
ASJC Scopus subject areas
- Energy(all)
- Energy Engineering and Power Technology
- Engineering(all)
- Electrical and Electronic Engineering
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VDE-Fachtagung Hochspannungstechnik 2018. VDE Verlag GmbH, 2018. p. 231-235 (VDE-Fachtagung Hochspannungstechnik 2018).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Druckabhängigkeit des Teilentladungsverhaltens in Hermetiktransformatoren
AU - Kuhnke, M.
AU - Werle, P.
N1 - Publisher Copyright: © VDE VERLAG GMBH · Berlin · Offenbach Copyright: Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2018
Y1 - 2018
N2 - Hermetically sealed power transformers have several advantages compared with conventional transformers with conservator. They are more compact and do not require air drying equipment, which need regular maintenance. Therefore, hermetically sealed transformers are common choice for wind power plants. In recent years there have been many reports of transformer failures in these wind power plants. Most of them related to partial discharges in the transformers. The thermal expansion of the insulating liquid can lead to a severe change of the internal pressure. Therefore, the pressure dependent PD inception for five different insulating liquids is investigated with different electrode configurations. A transformer model with two special electrodes resembling high voltage windings and aramid paper is used inside a test vessel with temperature and pressure control. With this model the PD inception can be measured at different pressures and temperatures. The electrodes can be replaced with standard needle-sphere electrodes. To investigate the influence of the dissolved gas in the liquid, the liquids are dried and degassed and then saturated with different gasses prior to the measurement. To compare these model results with a real transformer, the PD inception voltage is measured on a hermetically sealed 160 kVA transformer with varying internal pressure.
AB - Hermetically sealed power transformers have several advantages compared with conventional transformers with conservator. They are more compact and do not require air drying equipment, which need regular maintenance. Therefore, hermetically sealed transformers are common choice for wind power plants. In recent years there have been many reports of transformer failures in these wind power plants. Most of them related to partial discharges in the transformers. The thermal expansion of the insulating liquid can lead to a severe change of the internal pressure. Therefore, the pressure dependent PD inception for five different insulating liquids is investigated with different electrode configurations. A transformer model with two special electrodes resembling high voltage windings and aramid paper is used inside a test vessel with temperature and pressure control. With this model the PD inception can be measured at different pressures and temperatures. The electrodes can be replaced with standard needle-sphere electrodes. To investigate the influence of the dissolved gas in the liquid, the liquids are dried and degassed and then saturated with different gasses prior to the measurement. To compare these model results with a real transformer, the PD inception voltage is measured on a hermetically sealed 160 kVA transformer with varying internal pressure.
UR - http://www.scopus.com/inward/record.url?scp=85096770534&partnerID=8YFLogxK
M3 - Aufsatz in Konferenzband
AN - SCOPUS:85096770534
T3 - VDE-Fachtagung Hochspannungstechnik 2018
SP - 231
EP - 235
BT - VDE-Fachtagung Hochspannungstechnik 2018
PB - VDE Verlag GmbH
T2 - VDE-Fachtagung Hochspannungstechnik 2018 - VDE Conference on High Voltage Technology 2018
Y2 - 12 November 2018 through 14 November 2018
ER -