Abstract
In HVDC converter transformers, the potential DC component in electric stresses imposed on valve windings would unfavorably cause space charge accumulation inside oil-paper insulation. Insulation degradation and aging may have great effects on space charge behaviors in oil-paper insulation. This paper focuses on the effect of the low molecular weight (LMA) and the moisture on space charge phenomenon in oil impregnated-paper insulation. Pulsed electro-acoustic (PEA) technique was used in this study to measure space charge behaviors in 400 mu m thick, dry and moist single-layer paper sample impregnated in mineral oil prepared with different amounts of formic acid. The measurements were carried out at 30 { circ } mathrm { C } under a field strength of 20 kV/mm. It was found that LMA greatly strengthens the homo charge accumulation. The combination of LMA and moisture results in even more active space charge accumulations. In dry samples, the existence of LMA causes slower charge decaying rate. However, the introduction of the moisture accelerates the charge dissipation.
| Original language | English |
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| Title of host publication | ICHVE 2018 - 2018 IEEE International Conference on High Voltage Engineering and Application |
| Publisher | IEEE |
| ISBN (Electronic) | 9781538650868 |
| DOIs | |
| Publication status | Published - 2019 |
| Event | 2018 IEEE International Conference on High Voltage Engineering and Application, ICHVE 2018 - Athens, Greece Duration: 10 Sept 2018 → 13 Sept 2018 |
Conference
| Conference | 2018 IEEE International Conference on High Voltage Engineering and Application, ICHVE 2018 |
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| Country/Territory | Greece |
| City | Athens |
| Period | 10/09/18 → 13/09/18 |
Keywords
- converter transformer
- HVDC
- low molecular weight acids
- oil paper
- space charge